jdk8-mips64-public/hotspot: src/share/vm/opto/library

src/share/vm/opto/library_call.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/library_call.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compileLog.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "opto/addnode.hpp"
 #include "opto/callGenerator.hpp"
 #include "opto/cfgnode.hpp"
 #include "opto/idealKit.hpp"
 #include "opto/mathexactnode.hpp"
 #include "opto/mulnode.hpp"
 #include "opto/parse.hpp"
 #include "opto/runtime.hpp"
 #include "opto/subnode.hpp"
 #include "prims/nativeLookup.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "trace/traceMacros.hpp"
 class LibraryIntrinsic : public InlineCallGenerator {
   // Extend the set of intrinsics known to the runtime:
  public:
  private:
   bool             _is_virtual;
   bool             _is_predicted;
   bool             _does_virtual_dispatch;
   vmIntrinsics::ID _intrinsic_id;
  public:
   LibraryIntrinsic(ciMethod* m, bool is_virtual, bool is_predicted, bool does_virtual_dispatch, vmIntrinsics::ID id)
     : InlineCallGenerator(m),
       _is_virtual(is_virtual),
       _is_predicted(is_predicted),
       _does_virtual_dispatch(does_virtual_dispatch),
       _intrinsic_id(id)
   {
   }
   virtual bool is_intrinsic() const { return true; }
   virtual bool is_virtual()   const { return _is_virtual; }
   virtual bool is_predicted()   const { return _is_predicted; }
   virtual bool does_virtual_dispatch()   const { return _does_virtual_dispatch; }
   virtual JVMState* generate(JVMState* jvms, Parse* parent_parser);
   virtual Node* generate_predicate(JVMState* jvms);
   vmIntrinsics::ID intrinsic_id() const { return _intrinsic_id; }
 };
 // Local helper class for LibraryIntrinsic:
 class LibraryCallKit : public GraphKit {
  private:
   LibraryIntrinsic* _intrinsic;     // the library intrinsic being called
   Node*             _result;        // the result node, if any
   int               _reexecute_sp;  // the stack pointer when bytecode needs to be reexecuted
   const TypeOopPtr* sharpen_unsafe_type(Compile::AliasType* alias_type, const TypePtr *adr_type, bool is_native_ptr = false);
  public:
   LibraryCallKit(JVMState* jvms, LibraryIntrinsic* intrinsic)
     : GraphKit(jvms),
       _intrinsic(intrinsic),
       _result(NULL)
   {
     // Check if this is a root compile.  In that case we don't have a caller.
     if (!jvms->has_method()) {
       _reexecute_sp = sp();
     } else {
       // Find out how many arguments the interpreter needs when deoptimizing
       // and save the stack pointer value so it can used by uncommon_trap.
       // We find the argument count by looking at the declared signature.
       bool ignored_will_link;
       ciSignature* declared_signature = NULL;
       ciMethod* ignored_callee = caller()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
       const int nargs = declared_signature->arg_size_for_bc(caller()->java_code_at_bci(bci()));
       _reexecute_sp = sp() + nargs;  // "push" arguments back on stack
     }
   }
   virtual LibraryCallKit* is_LibraryCallKit() const { return (LibraryCallKit*)this; }
   ciMethod*         caller()    const    { return jvms()->method(); }
   int               bci()       const    { return jvms()->bci(); }
   LibraryIntrinsic* intrinsic() const    { return _intrinsic; }
   vmIntrinsics::ID  intrinsic_id() const { return _intrinsic->intrinsic_id(); }
   ciMethod*         callee()    const    { return _intrinsic->method(); }
   bool try_to_inline();
   Node* try_to_predicate();
   void push_result() {
     // Push the result onto the stack.
     if (!stopped() && result() != NULL) {
       BasicType bt = result()->bottom_type()->basic_type();
       push_node(bt, result());
     }
   }
  private:
   void fatal_unexpected_iid(vmIntrinsics::ID iid) {
     fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
   }
   void  set_result(Node* n) { assert(_result == NULL, "only set once"); _result = n; }
   void  set_result(RegionNode* region, PhiNode* value);
   Node*     result() { return _result; }
   virtual int reexecute_sp() { return _reexecute_sp; }
   // Helper functions to inline natives
   Node* generate_guard(Node* test, RegionNode* region, float true_prob);
   Node* generate_slow_guard(Node* test, RegionNode* region);
   Node* generate_fair_guard(Node* test, RegionNode* region);
   Node* generate_negative_guard(Node* index, RegionNode* region,
                                 // resulting CastII of index:
                                 Node* *pos_index = NULL);
   Node* generate_nonpositive_guard(Node* index, bool never_negative,
                                    // resulting CastII of index:
                                    Node* *pos_index = NULL);
   Node* generate_limit_guard(Node* offset, Node* subseq_length,
                              Node* array_length,
                              RegionNode* region);
   Node* generate_current_thread(Node* &tls_output);
   address basictype2arraycopy(BasicType t, Node *src_offset, Node *dest_offset,
                               bool disjoint_bases, const char* &name, bool dest_uninitialized);
   Node* load_mirror_from_klass(Node* klass);
   Node* load_klass_from_mirror_common(Node* mirror, bool never_see_null,
                                       RegionNode* region, int null_path,
                                       int offset);
   Node* load_klass_from_mirror(Node* mirror, bool never_see_null,
                                RegionNode* region, int null_path) {
     int offset = java_lang_Class::klass_offset_in_bytes();
     return load_klass_from_mirror_common(mirror, never_see_null,
                                          region, null_path,
                                          offset);
   }
   Node* load_array_klass_from_mirror(Node* mirror, bool never_see_null,
                                      RegionNode* region, int null_path) {
     int offset = java_lang_Class::array_klass_offset_in_bytes();
     return load_klass_from_mirror_common(mirror, never_see_null,
                                          region, null_path,
                                          offset);
   }
   Node* generate_access_flags_guard(Node* kls,
                                     int modifier_mask, int modifier_bits,
                                     RegionNode* region);
   Node* generate_interface_guard(Node* kls, RegionNode* region);
   Node* generate_array_guard(Node* kls, RegionNode* region) {
     return generate_array_guard_common(kls, region, false, false);
   }
   Node* generate_non_array_guard(Node* kls, RegionNode* region) {
     return generate_array_guard_common(kls, region, false, true);
   }
   Node* generate_objArray_guard(Node* kls, RegionNode* region) {
     return generate_array_guard_common(kls, region, true, false);
   }
   Node* generate_non_objArray_guard(Node* kls, RegionNode* region) {
     return generate_array_guard_common(kls, region, true, true);
   }
   Node* generate_array_guard_common(Node* kls, RegionNode* region,
                                     bool obj_array, bool not_array);
   Node* generate_virtual_guard(Node* obj_klass, RegionNode* slow_region);
   CallJavaNode* generate_method_call(vmIntrinsics::ID method_id,
                                      bool is_virtual = false, bool is_static = false);
   CallJavaNode* generate_method_call_static(vmIntrinsics::ID method_id) {
     return generate_method_call(method_id, false, true);
   }
   CallJavaNode* generate_method_call_virtual(vmIntrinsics::ID method_id) {
     return generate_method_call(method_id, true, false);
   }
   Node * load_field_from_object(Node * fromObj, const char * fieldName, const char * fieldTypeString, bool is_exact, bool is_static);
   Node* make_string_method_node(int opcode, Node* str1_start, Node* cnt1, Node* str2_start, Node* cnt2);
   Node* make_string_method_node(int opcode, Node* str1, Node* str2);
   bool inline_string_compareTo();
   bool inline_string_indexOf();
   Node* string_indexOf(Node* string_object, ciTypeArray* target_array, jint offset, jint cache_i, jint md2_i);
   bool inline_string_equals();
   Node* round_double_node(Node* n);
   bool runtime_math(const TypeFunc* call_type, address funcAddr, const char* funcName);
   bool inline_math_native(vmIntrinsics::ID id);
   bool inline_trig(vmIntrinsics::ID id);
   bool inline_math(vmIntrinsics::ID id);
   template <typename OverflowOp>
   bool inline_math_overflow(Node* arg1, Node* arg2);
   void inline_math_mathExact(Node* math, Node* test);
   bool inline_math_addExactI(bool is_increment);
   bool inline_math_addExactL(bool is_increment);
   bool inline_math_multiplyExactI();
   bool inline_math_multiplyExactL();
   bool inline_math_negateExactI();
   bool inline_math_negateExactL();
   bool inline_math_subtractExactI(bool is_decrement);
   bool inline_math_subtractExactL(bool is_decrement);
   bool inline_exp();
   bool inline_pow();
   Node* finish_pow_exp(Node* result, Node* x, Node* y, const TypeFunc* call_type, address funcAddr, const char* funcName);
   bool inline_min_max(vmIntrinsics::ID id);
   Node* generate_min_max(vmIntrinsics::ID id, Node* x, Node* y);
   // This returns Type::AnyPtr, RawPtr, or OopPtr.
   int classify_unsafe_addr(Node* &base, Node* &offset);
   Node* make_unsafe_address(Node* base, Node* offset);
   // Helper for inline_unsafe_access.
   // Generates the guards that check whether the result of
   // Unsafe.getObject should be recorded in an SATB log buffer.
   void insert_pre_barrier(Node* base_oop, Node* offset, Node* pre_val, bool need_mem_bar);
   bool inline_unsafe_access(bool is_native_ptr, bool is_store, BasicType type, bool is_volatile);
   bool inline_unsafe_prefetch(bool is_native_ptr, bool is_store, bool is_static);
   static bool klass_needs_init_guard(Node* kls);
   bool inline_unsafe_allocate();
   bool inline_unsafe_copyMemory();
   bool inline_native_currentThread();
 #ifdef TRACE_HAVE_INTRINSICS
   bool inline_native_classID();
   bool inline_native_threadID();
 #endif
   bool inline_native_time_funcs(address method, const char* funcName);
   bool inline_native_isInterrupted();
   bool inline_native_Class_query(vmIntrinsics::ID id);
   bool inline_native_subtype_check();
   bool inline_native_newArray();
   bool inline_native_getLength();
   bool inline_array_copyOf(bool is_copyOfRange);
   bool inline_array_equals();
   void copy_to_clone(Node* obj, Node* alloc_obj, Node* obj_size, bool is_array, bool card_mark);
   bool inline_native_clone(bool is_virtual);
   bool inline_native_Reflection_getCallerClass();
   // Helper function for inlining native object hash method
   bool inline_native_hashcode(bool is_virtual, bool is_static);
   bool inline_native_getClass();
   // Helper functions for inlining arraycopy
   bool inline_arraycopy();
   void generate_arraycopy(const TypePtr* adr_type,
                           BasicType basic_elem_type,
                           Node* src,  Node* src_offset,
                           Node* dest, Node* dest_offset,
                           Node* copy_length,
                           bool disjoint_bases = false,
                           bool length_never_negative = false,
                           RegionNode* slow_region = NULL);
   AllocateArrayNode* tightly_coupled_allocation(Node* ptr,
                                                 RegionNode* slow_region);
   void generate_clear_array(const TypePtr* adr_type,
                             Node* dest,
                             BasicType basic_elem_type,
                             Node* slice_off,
                             Node* slice_len,
                             Node* slice_end);
   bool generate_block_arraycopy(const TypePtr* adr_type,
                                 BasicType basic_elem_type,
                                 AllocateNode* alloc,
                                 Node* src,  Node* src_offset,
                                 Node* dest, Node* dest_offset,
                                 Node* dest_size, bool dest_uninitialized);
   void generate_slow_arraycopy(const TypePtr* adr_type,
                                Node* src,  Node* src_offset,
                                Node* dest, Node* dest_offset,
                                Node* copy_length, bool dest_uninitialized);
   Node* generate_checkcast_arraycopy(const TypePtr* adr_type,
                                      Node* dest_elem_klass,
                                      Node* src,  Node* src_offset,
                                      Node* dest, Node* dest_offset,
                                      Node* copy_length, bool dest_uninitialized);
   Node* generate_generic_arraycopy(const TypePtr* adr_type,
                                    Node* src,  Node* src_offset,
                                    Node* dest, Node* dest_offset,
                                    Node* copy_length, bool dest_uninitialized);
   void generate_unchecked_arraycopy(const TypePtr* adr_type,
                                     BasicType basic_elem_type,
                                     bool disjoint_bases,
                                     Node* src,  Node* src_offset,
                                     Node* dest, Node* dest_offset,
                                     Node* copy_length, bool dest_uninitialized);
   typedef enum { LS_xadd, LS_xchg, LS_cmpxchg } LoadStoreKind;
   bool inline_unsafe_load_store(BasicType type,  LoadStoreKind kind);
   bool inline_unsafe_ordered_store(BasicType type);
   bool inline_unsafe_fence(vmIntrinsics::ID id);
   bool inline_fp_conversions(vmIntrinsics::ID id);
   bool inline_number_methods(vmIntrinsics::ID id);
   bool inline_reference_get();
   bool inline_aescrypt_Block(vmIntrinsics::ID id);
   bool inline_cipherBlockChaining_AESCrypt(vmIntrinsics::ID id);
   Node* inline_cipherBlockChaining_AESCrypt_predicate(bool decrypting);
   Node* get_key_start_from_aescrypt_object(Node* aescrypt_object);
   Node* get_original_key_start_from_aescrypt_object(Node* aescrypt_object);
   bool inline_encodeISOArray();
   bool inline_updateCRC32();
   bool inline_updateBytesCRC32();
   bool inline_updateByteBufferCRC32();
 };
 //---------------------------make_vm_intrinsic----------------------------
 CallGenerator* Compile::make_vm_intrinsic(ciMethod* m, bool is_virtual) {
   vmIntrinsics::ID id = m->intrinsic_id();
   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
   if (DisableIntrinsic[0] != '\0'
       && strstr(DisableIntrinsic, vmIntrinsics::name_at(id)) != NULL) {
     // disabled by a user request on the command line:
     // example: -XX:DisableIntrinsic=_hashCode,_getClass
     return NULL;
   }
   if (!m->is_loaded()) {
     // do not attempt to inline unloaded methods
     return NULL;
   }
   // Only a few intrinsics implement a virtual dispatch.
   // They are expensive calls which are also frequently overridden.
   if (is_virtual) {
     switch (id) {
     case vmIntrinsics::_hashCode:
     case vmIntrinsics::_clone:
       // OK, Object.hashCode and Object.clone intrinsics come in both flavors
       break;
     default:
       return NULL;
     }
   }
   // -XX:-InlineNatives disables nearly all intrinsics:
   if (!InlineNatives) {
     switch (id) {
     case vmIntrinsics::_indexOf:
     case vmIntrinsics::_compareTo:
     case vmIntrinsics::_equals:
     case vmIntrinsics::_equalsC:
     case vmIntrinsics::_getAndAddInt:
     case vmIntrinsics::_getAndAddLong:
     case vmIntrinsics::_getAndSetInt:
     case vmIntrinsics::_getAndSetLong:
     case vmIntrinsics::_getAndSetObject:
     case vmIntrinsics::_loadFence:
     case vmIntrinsics::_storeFence:
     case vmIntrinsics::_fullFence:
       break;  // InlineNatives does not control String.compareTo
     case vmIntrinsics::_Reference_get:
       break;  // InlineNatives does not control Reference.get
     default:
       return NULL;
     }
   }
   bool is_predicted = false;
   bool does_virtual_dispatch = false;
   switch (id) {
   case vmIntrinsics::_compareTo:
     if (!SpecialStringCompareTo)  return NULL;
     if (!Matcher::match_rule_supported(Op_StrComp))  return NULL;
     break;
   case vmIntrinsics::_indexOf:
     if (!SpecialStringIndexOf)  return NULL;
     break;
   case vmIntrinsics::_equals:
     if (!SpecialStringEquals)  return NULL;
     if (!Matcher::match_rule_supported(Op_StrEquals))  return NULL;
     break;
   case vmIntrinsics::_equalsC:
     if (!SpecialArraysEquals)  return NULL;
     if (!Matcher::match_rule_supported(Op_AryEq))  return NULL;
     break;
   case vmIntrinsics::_arraycopy:
     if (!InlineArrayCopy)  return NULL;
     break;
   case vmIntrinsics::_copyMemory:
     if (StubRoutines::unsafe_arraycopy() == NULL)  return NULL;
     if (!InlineArrayCopy)  return NULL;
     break;
   case vmIntrinsics::_hashCode:
     if (!InlineObjectHash)  return NULL;
     does_virtual_dispatch = true;
     break;
   case vmIntrinsics::_clone:
     does_virtual_dispatch = true;
   case vmIntrinsics::_copyOf:
   case vmIntrinsics::_copyOfRange:
     if (!InlineObjectCopy)  return NULL;
     // These also use the arraycopy intrinsic mechanism:
     if (!InlineArrayCopy)  return NULL;
     break;
   case vmIntrinsics::_encodeISOArray:
     if (!SpecialEncodeISOArray)  return NULL;
     if (!Matcher::match_rule_supported(Op_EncodeISOArray))  return NULL;
     break;
   case vmIntrinsics::_checkIndex:
     // We do not intrinsify this.  The optimizer does fine with it.
     return NULL;
   case vmIntrinsics::_getCallerClass:
     if (!UseNewReflection)  return NULL;
     if (!InlineReflectionGetCallerClass)  return NULL;
     if (SystemDictionary::reflect_CallerSensitive_klass() == NULL)  return NULL;
     break;
   case vmIntrinsics::_bitCount_i:
     if (!Matcher::match_rule_supported(Op_PopCountI)) return NULL;
     break;
   case vmIntrinsics::_bitCount_l:
     if (!Matcher::match_rule_supported(Op_PopCountL)) return NULL;
     break;
   case vmIntrinsics::_numberOfLeadingZeros_i:
     if (!Matcher::match_rule_supported(Op_CountLeadingZerosI)) return NULL;
     break;
   case vmIntrinsics::_numberOfLeadingZeros_l:
     if (!Matcher::match_rule_supported(Op_CountLeadingZerosL)) return NULL;
     break;
   case vmIntrinsics::_numberOfTrailingZeros_i:
     if (!Matcher::match_rule_supported(Op_CountTrailingZerosI)) return NULL;
     break;
   case vmIntrinsics::_numberOfTrailingZeros_l:
     if (!Matcher::match_rule_supported(Op_CountTrailingZerosL)) return NULL;
     break;
   case vmIntrinsics::_reverseBytes_c:
     if (!Matcher::match_rule_supported(Op_ReverseBytesUS)) return NULL;
     break;
   case vmIntrinsics::_reverseBytes_s:
     if (!Matcher::match_rule_supported(Op_ReverseBytesS))  return NULL;
     break;
   case vmIntrinsics::_reverseBytes_i:
     if (!Matcher::match_rule_supported(Op_ReverseBytesI))  return NULL;
     break;
   case vmIntrinsics::_reverseBytes_l:
     if (!Matcher::match_rule_supported(Op_ReverseBytesL))  return NULL;
     break;
   case vmIntrinsics::_Reference_get:
     // Use the intrinsic version of Reference.get() so that the value in
     // the referent field can be registered by the G1 pre-barrier code.
     // Also add memory barrier to prevent commoning reads from this field
     // across safepoint since GC can change it value.
     break;
   case vmIntrinsics::_compareAndSwapObject:
 #ifdef _LP64
     if (!UseCompressedOops && !Matcher::match_rule_supported(Op_CompareAndSwapP)) return NULL;
 #endif
     break;
   case vmIntrinsics::_compareAndSwapLong:
     if (!Matcher::match_rule_supported(Op_CompareAndSwapL)) return NULL;
     break;
   case vmIntrinsics::_getAndAddInt:
     if (!Matcher::match_rule_supported(Op_GetAndAddI)) return NULL;
     break;
   case vmIntrinsics::_getAndAddLong:
     if (!Matcher::match_rule_supported(Op_GetAndAddL)) return NULL;
     break;
   case vmIntrinsics::_getAndSetInt:
     if (!Matcher::match_rule_supported(Op_GetAndSetI)) return NULL;
     break;
   case vmIntrinsics::_getAndSetLong:
     if (!Matcher::match_rule_supported(Op_GetAndSetL)) return NULL;
     break;
   case vmIntrinsics::_getAndSetObject:
 #ifdef _LP64
     if (!UseCompressedOops && !Matcher::match_rule_supported(Op_GetAndSetP)) return NULL;
     if (UseCompressedOops && !Matcher::match_rule_supported(Op_GetAndSetN)) return NULL;
     break;
 #else
     if (!Matcher::match_rule_supported(Op_GetAndSetP)) return NULL;
     break;
 #endif
   case vmIntrinsics::_aescrypt_encryptBlock:
   case vmIntrinsics::_aescrypt_decryptBlock:
     if (!UseAESIntrinsics) return NULL;
     break;
   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
     if (!UseAESIntrinsics) return NULL;
     // these two require the predicated logic
     is_predicted = true;
     break;
   case vmIntrinsics::_updateCRC32:
   case vmIntrinsics::_updateBytesCRC32:
   case vmIntrinsics::_updateByteBufferCRC32:
     if (!UseCRC32Intrinsics) return NULL;
     break;
   case vmIntrinsics::_incrementExactI:
   case vmIntrinsics::_addExactI:
     if (!Matcher::match_rule_supported(Op_OverflowAddI) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_incrementExactL:
   case vmIntrinsics::_addExactL:
     if (!Matcher::match_rule_supported(Op_OverflowAddL) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_decrementExactI:
   case vmIntrinsics::_subtractExactI:
     if (!Matcher::match_rule_supported(Op_OverflowSubI) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_decrementExactL:
   case vmIntrinsics::_subtractExactL:
     if (!Matcher::match_rule_supported(Op_OverflowSubL) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_negateExactI:
     if (!Matcher::match_rule_supported(Op_OverflowSubI) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_negateExactL:
     if (!Matcher::match_rule_supported(Op_OverflowSubL) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_multiplyExactI:
     if (!Matcher::match_rule_supported(Op_OverflowMulI) || !UseMathExactIntrinsics) return NULL;
     break;
   case vmIntrinsics::_multiplyExactL:
     if (!Matcher::match_rule_supported(Op_OverflowMulL) || !UseMathExactIntrinsics) return NULL;
     break;
  default:
     assert(id <= vmIntrinsics::LAST_COMPILER_INLINE, "caller responsibility");
     assert(id != vmIntrinsics::_Object_init && id != vmIntrinsics::_invoke, "enum out of order?");
     break;
   }
   // -XX:-InlineClassNatives disables natives from the Class class.
   // The flag applies to all reflective calls, notably Array.newArray
   // (visible to Java programmers as Array.newInstance).
   if (m->holder()->name() == ciSymbol::java_lang_Class() ||
       m->holder()->name() == ciSymbol::java_lang_reflect_Array()) {
     if (!InlineClassNatives)  return NULL;
   }
   // -XX:-InlineThreadNatives disables natives from the Thread class.
   if (m->holder()->name() == ciSymbol::java_lang_Thread()) {
     if (!InlineThreadNatives)  return NULL;
   }
   // -XX:-InlineMathNatives disables natives from the Math,Float and Double classes.
   if (m->holder()->name() == ciSymbol::java_lang_Math() ||
       m->holder()->name() == ciSymbol::java_lang_Float() ||
       m->holder()->name() == ciSymbol::java_lang_Double()) {
     if (!InlineMathNatives)  return NULL;
   }
   // -XX:-InlineUnsafeOps disables natives from the Unsafe class.
   if (m->holder()->name() == ciSymbol::sun_misc_Unsafe()) {
     if (!InlineUnsafeOps)  return NULL;
   }
   return new LibraryIntrinsic(m, is_virtual, is_predicted, does_virtual_dispatch, (vmIntrinsics::ID) id);
 }
 //----------------------register_library_intrinsics-----------------------
 // Initialize this file's data structures, for each Compile instance.
 void Compile::register_library_intrinsics() {
   // Nothing to do here.
 }
 JVMState* LibraryIntrinsic::generate(JVMState* jvms, Parse* parent_parser) {
   LibraryCallKit kit(jvms, this);
   Compile* C = kit.C;
   int nodes = C->unique();
 #ifndef PRODUCT
   if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
     char buf[1000];
     const char* str = vmIntrinsics::short_name_as_C_string(intrinsic_id(), buf, sizeof(buf));
     tty->print_cr("Intrinsic %s", str);
   }
 #endif
   ciMethod* callee = kit.callee();
   const int bci    = kit.bci();
   // Try to inline the intrinsic.
   if (kit.try_to_inline()) {
     if (C->print_intrinsics() || C->print_inlining()) {
       C->print_inlining(callee, jvms->depth() - 1, bci, is_virtual() ? "(intrinsic, virtual)" : "(intrinsic)");
     }
     C->gather_intrinsic_statistics(intrinsic_id(), is_virtual(), Compile::_intrinsic_worked);
     if (C->log()) {
       C->log()->elem("intrinsic id='%s'%s nodes='%d'",
                      vmIntrinsics::name_at(intrinsic_id()),
                      (is_virtual() ? " virtual='1'" : ""),
                      C->unique() - nodes);
     }
     // Push the result from the inlined method onto the stack.
     kit.push_result();
     return kit.transfer_exceptions_into_jvms();
   }
   // The intrinsic bailed out
   if (C->print_intrinsics() || C->print_inlining()) {
     if (jvms->has_method()) {
       // Not a root compile.
       const char* msg = is_virtual() ? "failed to inline (intrinsic, virtual)" : "failed to inline (intrinsic)";
       C->print_inlining(callee, jvms->depth() - 1, bci, msg);
     } else {
       // Root compile
       tty->print("Did not generate intrinsic %s%s at bci:%d in",
                vmIntrinsics::name_at(intrinsic_id()),
                (is_virtual() ? " (virtual)" : ""), bci);
     }
   }
   C->gather_intrinsic_statistics(intrinsic_id(), is_virtual(), Compile::_intrinsic_failed);
   return NULL;
 }
 Node* LibraryIntrinsic::generate_predicate(JVMState* jvms) {
   LibraryCallKit kit(jvms, this);
   Compile* C = kit.C;
   int nodes = C->unique();
 #ifndef PRODUCT
   assert(is_predicted(), "sanity");
   if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
     char buf[1000];
     const char* str = vmIntrinsics::short_name_as_C_string(intrinsic_id(), buf, sizeof(buf));
     tty->print_cr("Predicate for intrinsic %s", str);
   }
 #endif
   ciMethod* callee = kit.callee();
   const int bci    = kit.bci();
   Node* slow_ctl = kit.try_to_predicate();
   if (!kit.failing()) {
     if (C->print_intrinsics() || C->print_inlining()) {
       C->print_inlining(callee, jvms->depth() - 1, bci, is_virtual() ? "(intrinsic, virtual)" : "(intrinsic)");
     }
     C->gather_intrinsic_statistics(intrinsic_id(), is_virtual(), Compile::_intrinsic_worked);
     if (C->log()) {
       C->log()->elem("predicate_intrinsic id='%s'%s nodes='%d'",
                      vmIntrinsics::name_at(intrinsic_id()),
                      (is_virtual() ? " virtual='1'" : ""),
                      C->unique() - nodes);
     }
     return slow_ctl; // Could be NULL if the check folds.
   }
   // The intrinsic bailed out
   if (C->print_intrinsics() || C->print_inlining()) {
     if (jvms->has_method()) {
       // Not a root compile.
       const char* msg = "failed to generate predicate for intrinsic";
       C->print_inlining(kit.callee(), jvms->depth() - 1, bci, msg);
     } else {
       // Root compile
       C->print_inlining_stream()->print("Did not generate predicate for intrinsic %s%s at bci:%d in",
                                         vmIntrinsics::name_at(intrinsic_id()),
                                         (is_virtual() ? " (virtual)" : ""), bci);
     }
   }
   C->gather_intrinsic_statistics(intrinsic_id(), is_virtual(), Compile::_intrinsic_failed);
   return NULL;
 }
 bool LibraryCallKit::try_to_inline() {
   // Handle symbolic names for otherwise undistinguished boolean switches:
   const bool is_store       = true;
   const bool is_native_ptr  = true;
   const bool is_static      = true;
   const bool is_volatile    = true;
   if (!jvms()->has_method()) {
     // Root JVMState has a null method.
     assert(map()->memory()->Opcode() == Op_Parm, "");
     // Insert the memory aliasing node
     set_all_memory(reset_memory());
   }
   assert(merged_memory(), "");
   switch (intrinsic_id()) {
   case vmIntrinsics::_hashCode:                 return inline_native_hashcode(intrinsic()->is_virtual(), !is_static);
   case vmIntrinsics::_identityHashCode:         return inline_native_hashcode(/*!virtual*/ false,         is_static);
   case vmIntrinsics::_getClass:                 return inline_native_getClass();
   case vmIntrinsics::_dsin:
   case vmIntrinsics::_dcos:
   case vmIntrinsics::_dtan:
   case vmIntrinsics::_dabs:
   case vmIntrinsics::_datan2:
   case vmIntrinsics::_dsqrt:
   case vmIntrinsics::_dexp:
   case vmIntrinsics::_dlog:
   case vmIntrinsics::_dlog10:
   case vmIntrinsics::_dpow:                     return inline_math_native(intrinsic_id());
   case vmIntrinsics::_min:
   case vmIntrinsics::_max:                      return inline_min_max(intrinsic_id());
   case vmIntrinsics::_addExactI:                return inline_math_addExactI(false /* add */);
   case vmIntrinsics::_addExactL:                return inline_math_addExactL(false /* add */);
   case vmIntrinsics::_decrementExactI:          return inline_math_subtractExactI(true /* decrement */);
   case vmIntrinsics::_decrementExactL:          return inline_math_subtractExactL(true /* decrement */);
   case vmIntrinsics::_incrementExactI:          return inline_math_addExactI(true /* increment */);
   case vmIntrinsics::_incrementExactL:          return inline_math_addExactL(true /* increment */);
   case vmIntrinsics::_multiplyExactI:           return inline_math_multiplyExactI();
   case vmIntrinsics::_multiplyExactL:           return inline_math_multiplyExactL();
   case vmIntrinsics::_negateExactI:             return inline_math_negateExactI();
   case vmIntrinsics::_negateExactL:             return inline_math_negateExactL();
   case vmIntrinsics::_subtractExactI:           return inline_math_subtractExactI(false /* subtract */);
   case vmIntrinsics::_subtractExactL:           return inline_math_subtractExactL(false /* subtract */);
   case vmIntrinsics::_arraycopy:                return inline_arraycopy();
   case vmIntrinsics::_compareTo:                return inline_string_compareTo();
   case vmIntrinsics::_indexOf:                  return inline_string_indexOf();
   case vmIntrinsics::_equals:                   return inline_string_equals();
   case vmIntrinsics::_getObject:                return inline_unsafe_access(!is_native_ptr, !is_store, T_OBJECT,  !is_volatile);
   case vmIntrinsics::_getBoolean:               return inline_unsafe_access(!is_native_ptr, !is_store, T_BOOLEAN, !is_volatile);
   case vmIntrinsics::_getByte:                  return inline_unsafe_access(!is_native_ptr, !is_store, T_BYTE,    !is_volatile);
   case vmIntrinsics::_getShort:                 return inline_unsafe_access(!is_native_ptr, !is_store, T_SHORT,   !is_volatile);
   case vmIntrinsics::_getChar:                  return inline_unsafe_access(!is_native_ptr, !is_store, T_CHAR,    !is_volatile);
   case vmIntrinsics::_getInt:                   return inline_unsafe_access(!is_native_ptr, !is_store, T_INT,     !is_volatile);
   case vmIntrinsics::_getLong:                  return inline_unsafe_access(!is_native_ptr, !is_store, T_LONG,    !is_volatile);
   case vmIntrinsics::_getFloat:                 return inline_unsafe_access(!is_native_ptr, !is_store, T_FLOAT,   !is_volatile);
   case vmIntrinsics::_getDouble:                return inline_unsafe_access(!is_native_ptr, !is_store, T_DOUBLE,  !is_volatile);
   case vmIntrinsics::_putObject:                return inline_unsafe_access(!is_native_ptr,  is_store, T_OBJECT,  !is_volatile);
   case vmIntrinsics::_putBoolean:               return inline_unsafe_access(!is_native_ptr,  is_store, T_BOOLEAN, !is_volatile);
   case vmIntrinsics::_putByte:                  return inline_unsafe_access(!is_native_ptr,  is_store, T_BYTE,    !is_volatile);
   case vmIntrinsics::_putShort:                 return inline_unsafe_access(!is_native_ptr,  is_store, T_SHORT,   !is_volatile);
   case vmIntrinsics::_putChar:                  return inline_unsafe_access(!is_native_ptr,  is_store, T_CHAR,    !is_volatile);
   case vmIntrinsics::_putInt:                   return inline_unsafe_access(!is_native_ptr,  is_store, T_INT,     !is_volatile);
   case vmIntrinsics::_putLong:                  return inline_unsafe_access(!is_native_ptr,  is_store, T_LONG,    !is_volatile);
   case vmIntrinsics::_putFloat:                 return inline_unsafe_access(!is_native_ptr,  is_store, T_FLOAT,   !is_volatile);
   case vmIntrinsics::_putDouble:                return inline_unsafe_access(!is_native_ptr,  is_store, T_DOUBLE,  !is_volatile);
   case vmIntrinsics::_getByte_raw:              return inline_unsafe_access( is_native_ptr, !is_store, T_BYTE,    !is_volatile);
   case vmIntrinsics::_getShort_raw:             return inline_unsafe_access( is_native_ptr, !is_store, T_SHORT,   !is_volatile);
   case vmIntrinsics::_getChar_raw:              return inline_unsafe_access( is_native_ptr, !is_store, T_CHAR,    !is_volatile);
   case vmIntrinsics::_getInt_raw:               return inline_unsafe_access( is_native_ptr, !is_store, T_INT,     !is_volatile);
   case vmIntrinsics::_getLong_raw:              return inline_unsafe_access( is_native_ptr, !is_store, T_LONG,    !is_volatile);
   case vmIntrinsics::_getFloat_raw:             return inline_unsafe_access( is_native_ptr, !is_store, T_FLOAT,   !is_volatile);
   case vmIntrinsics::_getDouble_raw:            return inline_unsafe_access( is_native_ptr, !is_store, T_DOUBLE,  !is_volatile);
   case vmIntrinsics::_getAddress_raw:           return inline_unsafe_access( is_native_ptr, !is_store, T_ADDRESS, !is_volatile);
   case vmIntrinsics::_putByte_raw:              return inline_unsafe_access( is_native_ptr,  is_store, T_BYTE,    !is_volatile);
   case vmIntrinsics::_putShort_raw:             return inline_unsafe_access( is_native_ptr,  is_store, T_SHORT,   !is_volatile);
   case vmIntrinsics::_putChar_raw:              return inline_unsafe_access( is_native_ptr,  is_store, T_CHAR,    !is_volatile);
   case vmIntrinsics::_putInt_raw:               return inline_unsafe_access( is_native_ptr,  is_store, T_INT,     !is_volatile);
   case vmIntrinsics::_putLong_raw:              return inline_unsafe_access( is_native_ptr,  is_store, T_LONG,    !is_volatile);
   case vmIntrinsics::_putFloat_raw:             return inline_unsafe_access( is_native_ptr,  is_store, T_FLOAT,   !is_volatile);
   case vmIntrinsics::_putDouble_raw:            return inline_unsafe_access( is_native_ptr,  is_store, T_DOUBLE,  !is_volatile);
   case vmIntrinsics::_putAddress_raw:           return inline_unsafe_access( is_native_ptr,  is_store, T_ADDRESS, !is_volatile);
   case vmIntrinsics::_getObjectVolatile:        return inline_unsafe_access(!is_native_ptr, !is_store, T_OBJECT,   is_volatile);
   case vmIntrinsics::_getBooleanVolatile:       return inline_unsafe_access(!is_native_ptr, !is_store, T_BOOLEAN,  is_volatile);
   case vmIntrinsics::_getByteVolatile:          return inline_unsafe_access(!is_native_ptr, !is_store, T_BYTE,     is_volatile);
   case vmIntrinsics::_getShortVolatile:         return inline_unsafe_access(!is_native_ptr, !is_store, T_SHORT,    is_volatile);
   case vmIntrinsics::_getCharVolatile:          return inline_unsafe_access(!is_native_ptr, !is_store, T_CHAR,     is_volatile);
   case vmIntrinsics::_getIntVolatile:           return inline_unsafe_access(!is_native_ptr, !is_store, T_INT,      is_volatile);
   case vmIntrinsics::_getLongVolatile:          return inline_unsafe_access(!is_native_ptr, !is_store, T_LONG,     is_volatile);
   case vmIntrinsics::_getFloatVolatile:         return inline_unsafe_access(!is_native_ptr, !is_store, T_FLOAT,    is_volatile);
   case vmIntrinsics::_getDoubleVolatile:        return inline_unsafe_access(!is_native_ptr, !is_store, T_DOUBLE,   is_volatile);
   case vmIntrinsics::_putObjectVolatile:        return inline_unsafe_access(!is_native_ptr,  is_store, T_OBJECT,   is_volatile);
   case vmIntrinsics::_putBooleanVolatile:       return inline_unsafe_access(!is_native_ptr,  is_store, T_BOOLEAN,  is_volatile);
   case vmIntrinsics::_putByteVolatile:          return inline_unsafe_access(!is_native_ptr,  is_store, T_BYTE,     is_volatile);
   case vmIntrinsics::_putShortVolatile:         return inline_unsafe_access(!is_native_ptr,  is_store, T_SHORT,    is_volatile);
   case vmIntrinsics::_putCharVolatile:          return inline_unsafe_access(!is_native_ptr,  is_store, T_CHAR,     is_volatile);
   case vmIntrinsics::_putIntVolatile:           return inline_unsafe_access(!is_native_ptr,  is_store, T_INT,      is_volatile);
   case vmIntrinsics::_putLongVolatile:          return inline_unsafe_access(!is_native_ptr,  is_store, T_LONG,     is_volatile);
   case vmIntrinsics::_putFloatVolatile:         return inline_unsafe_access(!is_native_ptr,  is_store, T_FLOAT,    is_volatile);
   case vmIntrinsics::_putDoubleVolatile:        return inline_unsafe_access(!is_native_ptr,  is_store, T_DOUBLE,   is_volatile);
   case vmIntrinsics::_prefetchRead:             return inline_unsafe_prefetch(!is_native_ptr, !is_store, !is_static);
   case vmIntrinsics::_prefetchWrite:            return inline_unsafe_prefetch(!is_native_ptr,  is_store, !is_static);
   case vmIntrinsics::_prefetchReadStatic:       return inline_unsafe_prefetch(!is_native_ptr, !is_store,  is_static);
   case vmIntrinsics::_prefetchWriteStatic:      return inline_unsafe_prefetch(!is_native_ptr,  is_store,  is_static);
   case vmIntrinsics::_compareAndSwapObject:     return inline_unsafe_load_store(T_OBJECT, LS_cmpxchg);
   case vmIntrinsics::_compareAndSwapInt:        return inline_unsafe_load_store(T_INT,    LS_cmpxchg);
   case vmIntrinsics::_compareAndSwapLong:       return inline_unsafe_load_store(T_LONG,   LS_cmpxchg);
   case vmIntrinsics::_putOrderedObject:         return inline_unsafe_ordered_store(T_OBJECT);
   case vmIntrinsics::_putOrderedInt:            return inline_unsafe_ordered_store(T_INT);
   case vmIntrinsics::_putOrderedLong:           return inline_unsafe_ordered_store(T_LONG);
   case vmIntrinsics::_getAndAddInt:             return inline_unsafe_load_store(T_INT,    LS_xadd);
   case vmIntrinsics::_getAndAddLong:            return inline_unsafe_load_store(T_LONG,   LS_xadd);
   case vmIntrinsics::_getAndSetInt:             return inline_unsafe_load_store(T_INT,    LS_xchg);
   case vmIntrinsics::_getAndSetLong:            return inline_unsafe_load_store(T_LONG,   LS_xchg);
   case vmIntrinsics::_getAndSetObject:          return inline_unsafe_load_store(T_OBJECT, LS_xchg);
   case vmIntrinsics::_loadFence:
   case vmIntrinsics::_storeFence:
   case vmIntrinsics::_fullFence:                return inline_unsafe_fence(intrinsic_id());
   case vmIntrinsics::_currentThread:            return inline_native_currentThread();
   case vmIntrinsics::_isInterrupted:            return inline_native_isInterrupted();
 #ifdef TRACE_HAVE_INTRINSICS
   case vmIntrinsics::_classID:                  return inline_native_classID();
   case vmIntrinsics::_threadID:                 return inline_native_threadID();
   case vmIntrinsics::_counterTime:              return inline_native_time_funcs(CAST_FROM_FN_PTR(address, TRACE_TIME_METHOD), "counterTime");
 #endif
   case vmIntrinsics::_currentTimeMillis:        return inline_native_time_funcs(CAST_FROM_FN_PTR(address, os::javaTimeMillis), "currentTimeMillis");
   case vmIntrinsics::_nanoTime:                 return inline_native_time_funcs(CAST_FROM_FN_PTR(address, os::javaTimeNanos), "nanoTime");
   case vmIntrinsics::_allocateInstance:         return inline_unsafe_allocate();
   case vmIntrinsics::_copyMemory:               return inline_unsafe_copyMemory();
   case vmIntrinsics::_newArray:                 return inline_native_newArray();
   case vmIntrinsics::_getLength:                return inline_native_getLength();
   case vmIntrinsics::_copyOf:                   return inline_array_copyOf(false);
   case vmIntrinsics::_copyOfRange:              return inline_array_copyOf(true);
   case vmIntrinsics::_equalsC:                  return inline_array_equals();
   case vmIntrinsics::_clone:                    return inline_native_clone(intrinsic()->is_virtual());
   case vmIntrinsics::_isAssignableFrom:         return inline_native_subtype_check();
   case vmIntrinsics::_isInstance:
   case vmIntrinsics::_getModifiers:
   case vmIntrinsics::_isInterface:
   case vmIntrinsics::_isArray:
   case vmIntrinsics::_isPrimitive:
   case vmIntrinsics::_getSuperclass:
   case vmIntrinsics::_getComponentType:
   case vmIntrinsics::_getClassAccessFlags:      return inline_native_Class_query(intrinsic_id());
   case vmIntrinsics::_floatToRawIntBits:
   case vmIntrinsics::_floatToIntBits:
   case vmIntrinsics::_intBitsToFloat:
   case vmIntrinsics::_doubleToRawLongBits:
   case vmIntrinsics::_doubleToLongBits:
   case vmIntrinsics::_longBitsToDouble:         return inline_fp_conversions(intrinsic_id());
   case vmIntrinsics::_numberOfLeadingZeros_i:
   case vmIntrinsics::_numberOfLeadingZeros_l:
   case vmIntrinsics::_numberOfTrailingZeros_i:
   case vmIntrinsics::_numberOfTrailingZeros_l:
   case vmIntrinsics::_bitCount_i:
   case vmIntrinsics::_bitCount_l:
   case vmIntrinsics::_reverseBytes_i:
   case vmIntrinsics::_reverseBytes_l:
   case vmIntrinsics::_reverseBytes_s:
   case vmIntrinsics::_reverseBytes_c:           return inline_number_methods(intrinsic_id());
   case vmIntrinsics::_getCallerClass:           return inline_native_Reflection_getCallerClass();
   case vmIntrinsics::_Reference_get:            return inline_reference_get();
   case vmIntrinsics::_aescrypt_encryptBlock:
   case vmIntrinsics::_aescrypt_decryptBlock:    return inline_aescrypt_Block(intrinsic_id());
   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
     return inline_cipherBlockChaining_AESCrypt(intrinsic_id());
   case vmIntrinsics::_encodeISOArray:
     return inline_encodeISOArray();
   case vmIntrinsics::_updateCRC32:
     return inline_updateCRC32();
   case vmIntrinsics::_updateBytesCRC32:
     return inline_updateBytesCRC32();
   case vmIntrinsics::_updateByteBufferCRC32:
     return inline_updateByteBufferCRC32();
   default:
     // If you get here, it may be that someone has added a new intrinsic
     // to the list in vmSymbols.hpp without implementing it here.
 #ifndef PRODUCT
     if ((PrintMiscellaneous && (Verbose || WizardMode)) || PrintOpto) {
       tty->print_cr("*** Warning: Unimplemented intrinsic %s(%d)",
                     vmIntrinsics::name_at(intrinsic_id()), intrinsic_id());
     }
 #endif
     return false;
   }
 }
 Node* LibraryCallKit::try_to_predicate() {
   if (!jvms()->has_method()) {
     // Root JVMState has a null method.
     assert(map()->memory()->Opcode() == Op_Parm, "");
     // Insert the memory aliasing node
     set_all_memory(reset_memory());
   }
   assert(merged_memory(), "");
   switch (intrinsic_id()) {
   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
     return inline_cipherBlockChaining_AESCrypt_predicate(false);
   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
     return inline_cipherBlockChaining_AESCrypt_predicate(true);
   default:
     // If you get here, it may be that someone has added a new intrinsic
     // to the list in vmSymbols.hpp without implementing it here.
 #ifndef PRODUCT
     if ((PrintMiscellaneous && (Verbose || WizardMode)) || PrintOpto) {
       tty->print_cr("*** Warning: Unimplemented predicate for intrinsic %s(%d)",
                     vmIntrinsics::name_at(intrinsic_id()), intrinsic_id());
     }
 #endif
     Node* slow_ctl = control();
     set_control(top()); // No fast path instrinsic
     return slow_ctl;
   }
 }
 //------------------------------set_result-------------------------------
 // Helper function for finishing intrinsics.
 void LibraryCallKit::set_result(RegionNode* region, PhiNode* value) {
   record_for_igvn(region);
   set_control(_gvn.transform(region));
   set_result( _gvn.transform(value));
   assert(value->type()->basic_type() == result()->bottom_type()->basic_type(), "sanity");
 }
 //------------------------------generate_guard---------------------------
 // Helper function for generating guarded fast-slow graph structures.
 // The given 'test', if true, guards a slow path.  If the test fails
 // then a fast path can be taken.  (We generally hope it fails.)
 // In all cases, GraphKit::control() is updated to the fast path.
 // The returned value represents the control for the slow path.
 // The return value is never 'top'; it is either a valid control
 // or NULL if it is obvious that the slow path can never be taken.
 // Also, if region and the slow control are not NULL, the slow edge
 // is appended to the region.
 Node* LibraryCallKit::generate_guard(Node* test, RegionNode* region, float true_prob) {
   if (stopped()) {
     // Already short circuited.
     return NULL;
   }
   // Build an if node and its projections.
   // If test is true we take the slow path, which we assume is uncommon.
   if (_gvn.type(test) == TypeInt::ZERO) {
     // The slow branch is never taken.  No need to build this guard.
     return NULL;
   }
   IfNode* iff = create_and_map_if(control(), test, true_prob, COUNT_UNKNOWN);
   Node* if_slow = _gvn.transform(new (C) IfTrueNode(iff));
   if (if_slow == top()) {
     // The slow branch is never taken.  No need to build this guard.
     return NULL;
   }
   if (region != NULL)
     region->add_req(if_slow);
   Node* if_fast = _gvn.transform(new (C) IfFalseNode(iff));
   set_control(if_fast);
   return if_slow;
 }
 inline Node* LibraryCallKit::generate_slow_guard(Node* test, RegionNode* region) {
   return generate_guard(test, region, PROB_UNLIKELY_MAG(3));
 }
 inline Node* LibraryCallKit::generate_fair_guard(Node* test, RegionNode* region) {
   return generate_guard(test, region, PROB_FAIR);
 }
 inline Node* LibraryCallKit::generate_negative_guard(Node* index, RegionNode* region,
                                                      Node* *pos_index) {
   if (stopped())
     return NULL;                // already stopped
   if (_gvn.type(index)->higher_equal(TypeInt::POS)) // [0,maxint]
     return NULL;                // index is already adequately typed
   Node* cmp_lt = _gvn.transform(new (C) CmpINode(index, intcon(0)));
   Node* bol_lt = _gvn.transform(new (C) BoolNode(cmp_lt, BoolTest::lt));
   Node* is_neg = generate_guard(bol_lt, region, PROB_MIN);
   if (is_neg != NULL && pos_index != NULL) {
     // Emulate effect of Parse::adjust_map_after_if.
     Node* ccast = new (C) CastIINode(index, TypeInt::POS);
     ccast->set_req(0, control());
     (*pos_index) = _gvn.transform(ccast);
   }
   return is_neg;
 }
 inline Node* LibraryCallKit::generate_nonpositive_guard(Node* index, bool never_negative,
                                                         Node* *pos_index) {
   if (stopped())
     return NULL;                // already stopped
   if (_gvn.type(index)->higher_equal(TypeInt::POS1)) // [1,maxint]
     return NULL;                // index is already adequately typed
   Node* cmp_le = _gvn.transform(new (C) CmpINode(index, intcon(0)));
   BoolTest::mask le_or_eq = (never_negative ? BoolTest::eq : BoolTest::le);
   Node* bol_le = _gvn.transform(new (C) BoolNode(cmp_le, le_or_eq));
   Node* is_notp = generate_guard(bol_le, NULL, PROB_MIN);
   if (is_notp != NULL && pos_index != NULL) {
     // Emulate effect of Parse::adjust_map_after_if.
     Node* ccast = new (C) CastIINode(index, TypeInt::POS1);
     ccast->set_req(0, control());
     (*pos_index) = _gvn.transform(ccast);
   }
   return is_notp;
 }
 // Make sure that 'position' is a valid limit index, in [0..length].
 // There are two equivalent plans for checking this:
 //   A. (offset + copyLength)  unsigned<=  arrayLength
 //   B. offset  <=  (arrayLength - copyLength)
 // We require that all of the values above, except for the sum and
 // difference, are already known to be non-negative.
 // Plan A is robust in the face of overflow, if offset and copyLength
 // are both hugely positive.
 //
 // Plan B is less direct and intuitive, but it does not overflow at
 // all, since the difference of two non-negatives is always
 // representable.  Whenever Java methods must perform the equivalent
 // check they generally use Plan B instead of Plan A.
 // For the moment we use Plan A.
 inline Node* LibraryCallKit::generate_limit_guard(Node* offset,
                                                   Node* subseq_length,
                                                   Node* array_length,
                                                   RegionNode* region) {
   if (stopped())
     return NULL;                // already stopped
   bool zero_offset = _gvn.type(offset) == TypeInt::ZERO;
   if (zero_offset && subseq_length->eqv_uncast(array_length))
     return NULL;                // common case of whole-array copy
   Node* last = subseq_length;
   if (!zero_offset)             // last += offset
     last = _gvn.transform(new (C) AddINode(last, offset));
   Node* cmp_lt = _gvn.transform(new (C) CmpUNode(array_length, last));
   Node* bol_lt = _gvn.transform(new (C) BoolNode(cmp_lt, BoolTest::lt));
   Node* is_over = generate_guard(bol_lt, region, PROB_MIN);
   return is_over;
 }
 //--------------------------generate_current_thread--------------------
 Node* LibraryCallKit::generate_current_thread(Node* &tls_output) {
   ciKlass*    thread_klass = env()->Thread_klass();
   const Type* thread_type  = TypeOopPtr::make_from_klass(thread_klass)->cast_to_ptr_type(TypePtr::NotNull);
   Node* thread = _gvn.transform(new (C) ThreadLocalNode());
   Node* p = basic_plus_adr(top()/*!oop*/, thread, in_bytes(JavaThread::threadObj_offset()));
   Node* threadObj = make_load(NULL, p, thread_type, T_OBJECT, MemNode::unordered);
   tls_output = thread;
   return threadObj;
 }
 //------------------------------make_string_method_node------------------------
 // Helper method for String intrinsic functions. This version is called
 // with str1 and str2 pointing to String object nodes.
 //
 Node* LibraryCallKit::make_string_method_node(int opcode, Node* str1, Node* str2) {
   Node* no_ctrl = NULL;
   // Get start addr of string
   Node* str1_value   = load_String_value(no_ctrl, str1);
   Node* str1_offset  = load_String_offset(no_ctrl, str1);
   Node* str1_start   = array_element_address(str1_value, str1_offset, T_CHAR);
   // Get length of string 1
   Node* str1_len  = load_String_length(no_ctrl, str1);
   Node* str2_value   = load_String_value(no_ctrl, str2);
   Node* str2_offset  = load_String_offset(no_ctrl, str2);
   Node* str2_start   = array_element_address(str2_value, str2_offset, T_CHAR);
   Node* str2_len = NULL;
   Node* result = NULL;
   switch (opcode) {
   case Op_StrIndexOf:
     // Get length of string 2
     str2_len = load_String_length(no_ctrl, str2);
     result = new (C) StrIndexOfNode(control(), memory(TypeAryPtr::CHARS),
                                  str1_start, str1_len, str2_start, str2_len);
     break;
   case Op_StrComp:
     // Get length of string 2
     str2_len = load_String_length(no_ctrl, str2);
     result = new (C) StrCompNode(control(), memory(TypeAryPtr::CHARS),
                                  str1_start, str1_len, str2_start, str2_len);
     break;
   case Op_StrEquals:
     result = new (C) StrEqualsNode(control(), memory(TypeAryPtr::CHARS),
                                str1_start, str2_start, str1_len);
     break;
   default:
     ShouldNotReachHere();
     return NULL;
   }
   // All these intrinsics have checks.
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   return _gvn.transform(result);
 }
 // Helper method for String intrinsic functions. This version is called
 // with str1 and str2 pointing to char[] nodes, with cnt1 and cnt2 pointing
 // to Int nodes containing the lenghts of str1 and str2.
 //
 Node* LibraryCallKit::make_string_method_node(int opcode, Node* str1_start, Node* cnt1, Node* str2_start, Node* cnt2) {
   Node* result = NULL;
   switch (opcode) {
   case Op_StrIndexOf:
     result = new (C) StrIndexOfNode(control(), memory(TypeAryPtr::CHARS),
                                  str1_start, cnt1, str2_start, cnt2);
     break;
   case Op_StrComp:
     result = new (C) StrCompNode(control(), memory(TypeAryPtr::CHARS),
                                  str1_start, cnt1, str2_start, cnt2);
     break;
   case Op_StrEquals:
     result = new (C) StrEqualsNode(control(), memory(TypeAryPtr::CHARS),
                                  str1_start, str2_start, cnt1);
     break;
   default:
     ShouldNotReachHere();
     return NULL;
   }
   // All these intrinsics have checks.
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   return _gvn.transform(result);
 }
 //------------------------------inline_string_compareTo------------------------
 // public int java.lang.String.compareTo(String anotherString);
 bool LibraryCallKit::inline_string_compareTo() {
   Node* receiver = null_check(argument(0));
   Node* arg      = null_check(argument(1));
   if (stopped()) {
     return true;
   }
   set_result(make_string_method_node(Op_StrComp, receiver, arg));
   return true;
 }
 //------------------------------inline_string_equals------------------------
 bool LibraryCallKit::inline_string_equals() {
   Node* receiver = null_check_receiver();
   // NOTE: Do not null check argument for String.equals() because spec
   // allows to specify NULL as argument.
   Node* argument = this->argument(1);
   if (stopped()) {
     return true;
   }
   // paths (plus control) merge
   RegionNode* region = new (C) RegionNode(5);
   Node* phi = new (C) PhiNode(region, TypeInt::BOOL);
   // does source == target string?
   Node* cmp = _gvn.transform(new (C) CmpPNode(receiver, argument));
   Node* bol = _gvn.transform(new (C) BoolNode(cmp, BoolTest::eq));
   Node* if_eq = generate_slow_guard(bol, NULL);
   if (if_eq != NULL) {
     // receiver == argument
     phi->init_req(2, intcon(1));
     region->init_req(2, if_eq);
   }
   // get String klass for instanceOf
   ciInstanceKlass* klass = env()->String_klass();
   if (!stopped()) {
     Node* inst = gen_instanceof(argument, makecon(TypeKlassPtr::make(klass)));
     Node* cmp  = _gvn.transform(new (C) CmpINode(inst, intcon(1)));
     Node* bol  = _gvn.transform(new (C) BoolNode(cmp, BoolTest::ne));
     Node* inst_false = generate_guard(bol, NULL, PROB_MIN);
     //instanceOf == true, fallthrough
     if (inst_false != NULL) {
       phi->init_req(3, intcon(0));
       region->init_req(3, inst_false);
     }
   }
   if (!stopped()) {
     const TypeOopPtr* string_type = TypeOopPtr::make_from_klass(klass);
     // Properly cast the argument to String
     argument = _gvn.transform(new (C) CheckCastPPNode(control(), argument, string_type));
     // This path is taken only when argument's type is String:NotNull.
     argument = cast_not_null(argument, false);
     Node* no_ctrl = NULL;
     // Get start addr of receiver
     Node* receiver_val    = load_String_value(no_ctrl, receiver);
     Node* receiver_offset = load_String_offset(no_ctrl, receiver);
     Node* receiver_start = array_element_address(receiver_val, receiver_offset, T_CHAR);
     // Get length of receiver
     Node* receiver_cnt  = load_String_length(no_ctrl, receiver);
     // Get start addr of argument
     Node* argument_val    = load_String_value(no_ctrl, argument);
     Node* argument_offset = load_String_offset(no_ctrl, argument);
     Node* argument_start = array_element_address(argument_val, argument_offset, T_CHAR);
     // Get length of argument
     Node* argument_cnt  = load_String_length(no_ctrl, argument);
     // Check for receiver count != argument count
     Node* cmp = _gvn.transform(new(C) CmpINode(receiver_cnt, argument_cnt));
     Node* bol = _gvn.transform(new(C) BoolNode(cmp, BoolTest::ne));
     Node* if_ne = generate_slow_guard(bol, NULL);
     if (if_ne != NULL) {
       phi->init_req(4, intcon(0));
       region->init_req(4, if_ne);
     }
     // Check for count == 0 is done by assembler code for StrEquals.
     if (!stopped()) {
       Node* equals = make_string_method_node(Op_StrEquals, receiver_start, receiver_cnt, argument_start, argument_cnt);
       phi->init_req(1, equals);
       region->init_req(1, control());
     }
   }
   // post merge
   set_control(_gvn.transform(region));
   record_for_igvn(region);
   set_result(_gvn.transform(phi));
   return true;
 }
 //------------------------------inline_array_equals----------------------------
 bool LibraryCallKit::inline_array_equals() {
   Node* arg1 = argument(0);
   Node* arg2 = argument(1);
   set_result(_gvn.transform(new (C) AryEqNode(control(), memory(TypeAryPtr::CHARS), arg1, arg2)));
   return true;
 }
 // Java version of String.indexOf(constant string)
 // class StringDecl {
 //   StringDecl(char[] ca) {
 //     offset = 0;
 //     count = ca.length;
 //     value = ca;
 //   }
 //   int offset;
 //   int count;
 //   char[] value;
 // }
 //
 // static int string_indexOf_J(StringDecl string_object, char[] target_object,
 //                             int targetOffset, int cache_i, int md2) {
 //   int cache = cache_i;
 //   int sourceOffset = string_object.offset;
 //   int sourceCount = string_object.count;
 //   int targetCount = target_object.length;
 //
 //   int targetCountLess1 = targetCount - 1;
 //   int sourceEnd = sourceOffset + sourceCount - targetCountLess1;
 //
 //   char[] source = string_object.value;
 //   char[] target = target_object;
 //   int lastChar = target[targetCountLess1];
 //
 //  outer_loop:
 //   for (int i = sourceOffset; i < sourceEnd; ) {
 //     int src = source[i + targetCountLess1];
 //     if (src == lastChar) {
 //       // With random strings and a 4-character alphabet,
 //       // reverse matching at this point sets up 0.8% fewer
 //       // frames, but (paradoxically) makes 0.3% more probes.
 //       // Since those probes are nearer the lastChar probe,
 //       // there is may be a net D$ win with reverse matching.
 //       // But, reversing loop inhibits unroll of inner loop
 //       // for unknown reason.  So, does running outer loop from
 //       // (sourceOffset - targetCountLess1) to (sourceOffset + sourceCount)
 //       for (int j = 0; j < targetCountLess1; j++) {
 //         if (target[targetOffset + j] != source[i+j]) {
 //           if ((cache & (1 << source[i+j])) == 0) {
 //             if (md2 < j+1) {
 //               i += j+1;
 //               continue outer_loop;
 //             }
 //           }
 //           i += md2;
 //           continue outer_loop;
 //         }
 //       }
 //       return i - sourceOffset;
 //     }
 //     if ((cache & (1 << src)) == 0) {
 //       i += targetCountLess1;
 //     } // using "i += targetCount;" and an "else i++;" causes a jump to jump.
 //     i++;
 //   }
 //   return -1;
 // }
 //------------------------------string_indexOf------------------------
 Node* LibraryCallKit::string_indexOf(Node* string_object, ciTypeArray* target_array, jint targetOffset_i,
                                      jint cache_i, jint md2_i) {
   Node* no_ctrl  = NULL;
   float likely   = PROB_LIKELY(0.9);
   float unlikely = PROB_UNLIKELY(0.9);
   const int nargs = 0; // no arguments to push back for uncommon trap in predicate
   Node* source        = load_String_value(no_ctrl, string_object);
   Node* sourceOffset  = load_String_offset(no_ctrl, string_object);
   Node* sourceCount   = load_String_length(no_ctrl, string_object);
   Node* target = _gvn.transform( makecon(TypeOopPtr::make_from_constant(target_array, true)));
   jint target_length = target_array->length();
   const TypeAry* target_array_type = TypeAry::make(TypeInt::CHAR, TypeInt::make(0, target_length, Type::WidenMin));
   const TypeAryPtr* target_type = TypeAryPtr::make(TypePtr::BotPTR, target_array_type, target_array->klass(), true, Type::OffsetBot);
   // String.value field is known to be @Stable.
   if (UseImplicitStableValues) {
     target = cast_array_to_stable(target, target_type);
   }
   IdealKit kit(this, false, true);
 #define __ kit.
   Node* zero             = __ ConI(0);
   Node* one              = __ ConI(1);
   Node* cache            = __ ConI(cache_i);
   Node* md2              = __ ConI(md2_i);
   Node* lastChar         = __ ConI(target_array->char_at(target_length - 1));
   Node* targetCount      = __ ConI(target_length);
   Node* targetCountLess1 = __ ConI(target_length - 1);
   Node* targetOffset     = __ ConI(targetOffset_i);
   Node* sourceEnd        = __ SubI(__ AddI(sourceOffset, sourceCount), targetCountLess1);
   IdealVariable rtn(kit), i(kit), j(kit); __ declarations_done();
   Node* outer_loop = __ make_label(2 /* goto */);
   Node* return_    = __ make_label(1);
   __ set(rtn,__ ConI(-1));
   __ loop(this, nargs, i, sourceOffset, BoolTest::lt, sourceEnd); {
        Node* i2  = __ AddI(__ value(i), targetCountLess1);
        // pin to prohibit loading of "next iteration" value which may SEGV (rare)
        Node* src = load_array_element(__ ctrl(), source, i2, TypeAryPtr::CHARS);
        __ if_then(src, BoolTest::eq, lastChar, unlikely); {
          __ loop(this, nargs, j, zero, BoolTest::lt, targetCountLess1); {
               Node* tpj = __ AddI(targetOffset, __ value(j));
               Node* targ = load_array_element(no_ctrl, target, tpj, target_type);
               Node* ipj  = __ AddI(__ value(i), __ value(j));
               Node* src2 = load_array_element(no_ctrl, source, ipj, TypeAryPtr::CHARS);
               __ if_then(targ, BoolTest::ne, src2); {
                 __ if_then(__ AndI(cache, __ LShiftI(one, src2)), BoolTest::eq, zero); {
                   __ if_then(md2, BoolTest::lt, __ AddI(__ value(j), one)); {
                     __ increment(i, __ AddI(__ value(j), one));
                     __ goto_(outer_loop);
                   } __ end_if(); __ dead(j);
                 }__ end_if(); __ dead(j);
                 __ increment(i, md2);
                 __ goto_(outer_loop);
               }__ end_if();
               __ increment(j, one);
          }__ end_loop(); __ dead(j);
          __ set(rtn, __ SubI(__ value(i), sourceOffset)); __ dead(i);
          __ goto_(return_);
        }__ end_if();
        __ if_then(__ AndI(cache, __ LShiftI(one, src)), BoolTest::eq, zero, likely); {
          __ increment(i, targetCountLess1);
        }__ end_if();
        __ increment(i, one);
        __ bind(outer_loop);
   }__ end_loop(); __ dead(i);
   __ bind(return_);
   // Final sync IdealKit and GraphKit.
   final_sync(kit);
   Node* result = __ value(rtn);
 #undef __
   C->set_has_loops(true);
   return result;
 }
 //------------------------------inline_string_indexOf------------------------
 bool LibraryCallKit::inline_string_indexOf() {
   Node* receiver = argument(0);
   Node* arg      = argument(1);
   Node* result;
   // Disable the use of pcmpestri until it can be guaranteed that
   // the load doesn't cross into the uncommited space.
   if (Matcher::has_match_rule(Op_StrIndexOf) &&
       UseSSE42Intrinsics) {
     // Generate SSE4.2 version of indexOf
     // We currently only have match rules that use SSE4.2
     receiver = null_check(receiver);
     arg      = null_check(arg);
     if (stopped()) {
       return true;
     }
     ciInstanceKlass* str_klass = env()->String_klass();
     const TypeOopPtr* string_type = TypeOopPtr::make_from_klass(str_klass);
     // Make the merge point
     RegionNode* result_rgn = new (C) RegionNode(4);
     Node*       result_phi = new (C) PhiNode(result_rgn, TypeInt::INT);
     Node* no_ctrl  = NULL;
     // Get start addr of source string
     Node* source = load_String_value(no_ctrl, receiver);
     Node* source_offset = load_String_offset(no_ctrl, receiver);
     Node* source_start = array_element_address(source, source_offset, T_CHAR);
     // Get length of source string
     Node* source_cnt  = load_String_length(no_ctrl, receiver);
     // Get start addr of substring
     Node* substr = load_String_value(no_ctrl, arg);
     Node* substr_offset = load_String_offset(no_ctrl, arg);
     Node* substr_start = array_element_address(substr, substr_offset, T_CHAR);
     // Get length of source string
     Node* substr_cnt  = load_String_length(no_ctrl, arg);
     // Check for substr count > string count
     Node* cmp = _gvn.transform(new(C) CmpINode(substr_cnt, source_cnt));
     Node* bol = _gvn.transform(new(C) BoolNode(cmp, BoolTest::gt));
     Node* if_gt = generate_slow_guard(bol, NULL);
     if (if_gt != NULL) {
       result_phi->init_req(2, intcon(-1));
       result_rgn->init_req(2, if_gt);
     }
     if (!stopped()) {
       // Check for substr count == 0
       cmp = _gvn.transform(new(C) CmpINode(substr_cnt, intcon(0)));
       bol = _gvn.transform(new(C) BoolNode(cmp, BoolTest::eq));
       Node* if_zero = generate_slow_guard(bol, NULL);
       if (if_zero != NULL) {
         result_phi->init_req(3, intcon(0));
         result_rgn->init_req(3, if_zero);
       }
     }
     if (!stopped()) {
       result = make_string_method_node(Op_StrIndexOf, source_start, source_cnt, substr_start, substr_cnt);
       result_phi->init_req(1, result);
       result_rgn->init_req(1, control());
     }
     set_control(_gvn.transform(result_rgn));
     record_for_igvn(result_rgn);
     result = _gvn.transform(result_phi);
   } else { // Use LibraryCallKit::string_indexOf
     // don't intrinsify if argument isn't a constant string.
     if (!arg->is_Con()) {
      return false;
     }
     const TypeOopPtr* str_type = _gvn.type(arg)->isa_oopptr();
     if (str_type == NULL) {
       return false;
     }
     ciInstanceKlass* klass = env()->String_klass();
     ciObject* str_const = str_type->const_oop();
     if (str_const == NULL || str_const->klass() != klass) {
       return false;
     }
     ciInstance* str = str_const->as_instance();
     assert(str != NULL, "must be instance");
     ciObject* v = str->field_value_by_offset(java_lang_String::value_offset_in_bytes()).as_object();
     ciTypeArray* pat = v->as_type_array(); // pattern (argument) character array
     int o;
     int c;
     if (java_lang_String::has_offset_field()) {
       o = str->field_value_by_offset(java_lang_String::offset_offset_in_bytes()).as_int();
       c = str->field_value_by_offset(java_lang_String::count_offset_in_bytes()).as_int();
     } else {
       o = 0;
       c = pat->length();
     }
     // constant strings have no offset and count == length which
     // simplifies the resulting code somewhat so lets optimize for that.
     if (o != 0 || c != pat->length()) {
      return false;
     }
     receiver = null_check(receiver, T_OBJECT);
     // NOTE: No null check on the argument is needed since it's a constant String oop.
     if (stopped()) {
       return true;
     }
     // The null string as a pattern always returns 0 (match at beginning of string)
     if (c == 0) {
       set_result(intcon(0));
       return true;
     }
     // Generate default indexOf
     jchar lastChar = pat->char_at(o + (c - 1));
     int cache = 0;
     int i;
     for (i = 0; i < c - 1; i++) {
       assert(i < pat->length(), "out of range");
       cache |= (1 << (pat->char_at(o + i) & (sizeof(cache) * BitsPerByte - 1)));
     }
     int md2 = c;
     for (i = 0; i < c - 1; i++) {
       assert(i < pat->length(), "out of range");
       if (pat->char_at(o + i) == lastChar) {
         md2 = (c - 1) - i;
       }
     }
     result = string_indexOf(receiver, pat, o, cache, md2);
   }
   set_result(result);
   return true;
 }
 //--------------------------round_double_node--------------------------------
 // Round a double node if necessary.
 Node* LibraryCallKit::round_double_node(Node* n) {
   if (Matcher::strict_fp_requires_explicit_rounding && UseSSE <= 1)
     n = _gvn.transform(new (C) RoundDoubleNode(0, n));
   return n;
 }
 //------------------------------inline_math-----------------------------------
 // public static double Math.abs(double)
 // public static double Math.sqrt(double)
 // public static double Math.log(double)
 // public static double Math.log10(double)
 bool LibraryCallKit::inline_math(vmIntrinsics::ID id) {
   Node* arg = round_double_node(argument(0));
   Node* n;
   switch (id) {
   case vmIntrinsics::_dabs:   n = new (C) AbsDNode(                arg);  break;
   case vmIntrinsics::_dsqrt:  n = new (C) SqrtDNode(C, control(),  arg);  break;
   case vmIntrinsics::_dlog:   n = new (C) LogDNode(C, control(),   arg);  break;
   case vmIntrinsics::_dlog10: n = new (C) Log10DNode(C, control(), arg);  break;
   default:  fatal_unexpected_iid(id);  break;
   }
   set_result(_gvn.transform(n));
   return true;
 }
 //------------------------------inline_trig----------------------------------
 // Inline sin/cos/tan instructions, if possible.  If rounding is required, do
 // argument reduction which will turn into a fast/slow diamond.
 bool LibraryCallKit::inline_trig(vmIntrinsics::ID id) {
   Node* arg = round_double_node(argument(0));
   Node* n = NULL;
   switch (id) {
   case vmIntrinsics::_dsin:  n = new (C) SinDNode(C, control(), arg);  break;
   case vmIntrinsics::_dcos:  n = new (C) CosDNode(C, control(), arg);  break;
   case vmIntrinsics::_dtan:  n = new (C) TanDNode(C, control(), arg);  break;
   default:  fatal_unexpected_iid(id);  break;
   }
   n = _gvn.transform(n);
   // Rounding required?  Check for argument reduction!
   if (Matcher::strict_fp_requires_explicit_rounding) {
     static const double     pi_4 =  0.7853981633974483;
     static const double neg_pi_4 = -0.7853981633974483;
     // pi/2 in 80-bit extended precision
     // static const unsigned char pi_2_bits_x[] = {0x35,0xc2,0x68,0x21,0xa2,0xda,0x0f,0xc9,0xff,0x3f,0x00,0x00,0x00,0x00,0x00,0x00};
     // -pi/2 in 80-bit extended precision
     // static const unsigned char neg_pi_2_bits_x[] = {0x35,0xc2,0x68,0x21,0xa2,0xda,0x0f,0xc9,0xff,0xbf,0x00,0x00,0x00,0x00,0x00,0x00};
     // Cutoff value for using this argument reduction technique
     //static const double    pi_2_minus_epsilon =  1.564660403643354;
     //static const double neg_pi_2_plus_epsilon = -1.564660403643354;
     // Pseudocode for sin:
     // if (x <= Math.PI / 4.0) {
     //   if (x >= -Math.PI / 4.0) return  fsin(x);
     //   if (x >= -Math.PI / 2.0) return -fcos(x + Math.PI / 2.0);
     // } else {
     //   if (x <=  Math.PI / 2.0) return  fcos(x - Math.PI / 2.0);
     // }
     // return StrictMath.sin(x);
     // Pseudocode for cos:
     // if (x <= Math.PI / 4.0) {
     //   if (x >= -Math.PI / 4.0) return  fcos(x);
     //   if (x >= -Math.PI / 2.0) return  fsin(x + Math.PI / 2.0);
     // } else {
     //   if (x <=  Math.PI / 2.0) return -fsin(x - Math.PI / 2.0);
     // }
     // return StrictMath.cos(x);
     // Actually, sticking in an 80-bit Intel value into C2 will be tough; it
     // requires a special machine instruction to load it.  Instead we'll try
     // the 'easy' case.  If we really need the extra range +/- PI/2 we'll
     // probably do the math inside the SIN encoding.
     // Make the merge point
     RegionNode* r = new (C) RegionNode(3);
     Node* phi = new (C) PhiNode(r, Type::DOUBLE);
     // Flatten arg so we need only 1 test
     Node *abs = _gvn.transform(new (C) AbsDNode(arg));
     // Node for PI/4 constant
     Node *pi4 = makecon(TypeD::make(pi_4));
     // Check PI/4 : abs(arg)
     Node *cmp = _gvn.transform(new (C) CmpDNode(pi4,abs));
     // Check: If PI/4 < abs(arg) then go slow
     Node *bol = _gvn.transform(new (C) BoolNode( cmp, BoolTest::lt ));
     // Branch either way
     IfNode *iff = create_and_xform_if(control(),bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN);
     set_control(opt_iff(r,iff));
     // Set fast path result
     phi->init_req(2, n);
     // Slow path - non-blocking leaf call
     Node* call = NULL;
     switch (id) {
     case vmIntrinsics::_dsin:
       call = make_runtime_call(RC_LEAF, OptoRuntime::Math_D_D_Type(),
                                CAST_FROM_FN_PTR(address, SharedRuntime::dsin),
                                "Sin", NULL, arg, top());
       break;
     case vmIntrinsics::_dcos:
       call = make_runtime_call(RC_LEAF, OptoRuntime::Math_D_D_Type(),
                                CAST_FROM_FN_PTR(address, SharedRuntime::dcos),
                                "Cos", NULL, arg, top());
       break;
     case vmIntrinsics::_dtan:
       call = make_runtime_call(RC_LEAF, OptoRuntime::Math_D_D_Type(),
                                CAST_FROM_FN_PTR(address, SharedRuntime::dtan),
                                "Tan", NULL, arg, top());
       break;
     }
     assert(control()->in(0) == call, "");
     Node* slow_result = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms));
     r->init_req(1, control());
     phi->init_req(1, slow_result);
     // Post-merge
     set_control(_gvn.transform(r));
     record_for_igvn(r);
     n = _gvn.transform(phi);
     C->set_has_split_ifs(true); // Has chance for split-if optimization
   }
   set_result(n);
   return true;
 }
 Node* LibraryCallKit::finish_pow_exp(Node* result, Node* x, Node* y, const TypeFunc* call_type, address funcAddr, const char* funcName) {
   //-------------------
   //result=(result.isNaN())? funcAddr():result;
   // Check: If isNaN() by checking result!=result? then either trap
   // or go to runtime
   Node* cmpisnan = _gvn.transform(new (C) CmpDNode(result, result));
   // Build the boolean node
   Node* bolisnum = _gvn.transform(new (C) BoolNode(cmpisnan, BoolTest::eq));
   if (!too_many_traps(Deoptimization::Reason_intrinsic)) {
     { BuildCutout unless(this, bolisnum, PROB_STATIC_FREQUENT);
       // The pow or exp intrinsic returned a NaN, which requires a call
       // to the runtime.  Recompile with the runtime call.
       uncommon_trap(Deoptimization::Reason_intrinsic,
                     Deoptimization::Action_make_not_entrant);
     }
     return result;
   } else {
     // If this inlining ever returned NaN in the past, we compile a call
     // to the runtime to properly handle corner cases
     IfNode* iff = create_and_xform_if(control(), bolisnum, PROB_STATIC_FREQUENT, COUNT_UNKNOWN);
     Node* if_slow = _gvn.transform(new (C) IfFalseNode(iff));
     Node* if_fast = _gvn.transform(new (C) IfTrueNode(iff));
     if (!if_slow->is_top()) {
       RegionNode* result_region = new (C) RegionNode(3);
       PhiNode*    result_val = new (C) PhiNode(result_region, Type::DOUBLE);
       result_region->init_req(1, if_fast);
       result_val->init_req(1, result);
       set_control(if_slow);
       const TypePtr* no_memory_effects = NULL;
       Node* rt = make_runtime_call(RC_LEAF, call_type, funcAddr, funcName,
                                    no_memory_effects,
                                    x, top(), y, y ? top() : NULL);
       Node* value = _gvn.transform(new (C) ProjNode(rt, TypeFunc::Parms+0));
 #ifdef ASSERT
       Node* value_top = _gvn.transform(new (C) ProjNode(rt, TypeFunc::Parms+1));
       assert(value_top == top(), "second value must be top");
 #endif
       result_region->init_req(2, control());
       result_val->init_req(2, value);
       set_control(_gvn.transform(result_region));
       return _gvn.transform(result_val);
     } else {
       return result;
     }
   }
 }
 //------------------------------inline_exp-------------------------------------
 // Inline exp instructions, if possible.  The Intel hardware only misses
 // really odd corner cases (+/- Infinity).  Just uncommon-trap them.
 bool LibraryCallKit::inline_exp() {
   Node* arg = round_double_node(argument(0));
   Node* n   = _gvn.transform(new (C) ExpDNode(C, control(), arg));
   n = finish_pow_exp(n, arg, NULL, OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dexp), "EXP");
   set_result(n);
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   return true;
 }
 //------------------------------inline_pow-------------------------------------
 // Inline power instructions, if possible.
 bool LibraryCallKit::inline_pow() {
   // Pseudocode for pow
   // if (y == 2) {
   //   return x * x;
   // } else {
   //   if (x <= 0.0) {
   //     long longy = (long)y;
   //     if ((double)longy == y) { // if y is long
   //       if (y + 1 == y) longy = 0; // huge number: even
   //       result = ((1&longy) == 0)?-DPow(abs(x), y):DPow(abs(x), y);
   //     } else {
   //       result = NaN;
   //     }
   //   } else {
   //     result = DPow(x,y);
   //   }
   //   if (result != result)?  {
   //     result = uncommon_trap() or runtime_call();
   //   }
   //   return result;
   // }
   Node* x = round_double_node(argument(0));
   Node* y = round_double_node(argument(2));
   Node* result = NULL;
   Node*   const_two_node = makecon(TypeD::make(2.0));
   Node*   cmp_node       = _gvn.transform(new (C) CmpDNode(y, const_two_node));
   Node*   bool_node      = _gvn.transform(new (C) BoolNode(cmp_node, BoolTest::eq));
   IfNode* if_node        = create_and_xform_if(control(), bool_node, PROB_STATIC_INFREQUENT, COUNT_UNKNOWN);
   Node*   if_true        = _gvn.transform(new (C) IfTrueNode(if_node));
   Node*   if_false       = _gvn.transform(new (C) IfFalseNode(if_node));
   RegionNode* region_node = new (C) RegionNode(3);
   region_node->init_req(1, if_true);
   Node* phi_node = new (C) PhiNode(region_node, Type::DOUBLE);
   // special case for x^y where y == 2, we can convert it to x * x
   phi_node->init_req(1, _gvn.transform(new (C) MulDNode(x, x)));
   // set control to if_false since we will now process the false branch
   set_control(if_false);
   if (!too_many_traps(Deoptimization::Reason_intrinsic)) {
     // Short form: skip the fancy tests and just check for NaN result.
     result = _gvn.transform(new (C) PowDNode(C, control(), x, y));
   } else {
     // If this inlining ever returned NaN in the past, include all
     // checks + call to the runtime.
     // Set the merge point for If node with condition of (x <= 0.0)
     // There are four possible paths to region node and phi node
     RegionNode *r = new (C) RegionNode(4);
     Node *phi = new (C) PhiNode(r, Type::DOUBLE);
     // Build the first if node: if (x <= 0.0)
     // Node for 0 constant
     Node *zeronode = makecon(TypeD::ZERO);
     // Check x:0
     Node *cmp = _gvn.transform(new (C) CmpDNode(x, zeronode));
     // Check: If (x<=0) then go complex path
     Node *bol1 = _gvn.transform(new (C) BoolNode( cmp, BoolTest::le ));
     // Branch either way
     IfNode *if1 = create_and_xform_if(control(),bol1, PROB_STATIC_INFREQUENT, COUNT_UNKNOWN);
     // Fast path taken; set region slot 3
     Node *fast_taken = _gvn.transform(new (C) IfFalseNode(if1));
     r->init_req(3,fast_taken); // Capture fast-control
     // Fast path not-taken, i.e. slow path
     Node *complex_path = _gvn.transform(new (C) IfTrueNode(if1));
     // Set fast path result
     Node *fast_result = _gvn.transform(new (C) PowDNode(C, control(), x, y));
     phi->init_req(3, fast_result);
     // Complex path
     // Build the second if node (if y is long)
     // Node for (long)y
     Node *longy = _gvn.transform(new (C) ConvD2LNode(y));
     // Node for (double)((long) y)
     Node *doublelongy= _gvn.transform(new (C) ConvL2DNode(longy));
     // Check (double)((long) y) : y
     Node *cmplongy= _gvn.transform(new (C) CmpDNode(doublelongy, y));
     // Check if (y isn't long) then go to slow path
     Node *bol2 = _gvn.transform(new (C) BoolNode( cmplongy, BoolTest::ne ));
     // Branch either way
     IfNode *if2 = create_and_xform_if(complex_path,bol2, PROB_STATIC_INFREQUENT, COUNT_UNKNOWN);
     Node* ylong_path = _gvn.transform(new (C) IfFalseNode(if2));
     Node *slow_path = _gvn.transform(new (C) IfTrueNode(if2));
     // Calculate DPow(abs(x), y)*(1 & (long)y)
     // Node for constant 1
     Node *conone = longcon(1);
     // 1& (long)y
     Node *signnode= _gvn.transform(new (C) AndLNode(conone, longy));
     // A huge number is always even. Detect a huge number by checking
     // if y + 1 == y and set integer to be tested for parity to 0.
     // Required for corner case:
     // (long)9.223372036854776E18 = max_jlong
     // (double)(long)9.223372036854776E18 = 9.223372036854776E18
     // max_jlong is odd but 9.223372036854776E18 is even
     Node* yplus1 = _gvn.transform(new (C) AddDNode(y, makecon(TypeD::make(1))));
     Node *cmpyplus1= _gvn.transform(new (C) CmpDNode(yplus1, y));
     Node *bolyplus1 = _gvn.transform(new (C) BoolNode( cmpyplus1, BoolTest::eq ));
     Node* correctedsign = NULL;
     if (ConditionalMoveLimit != 0) {
       correctedsign = _gvn.transform( CMoveNode::make(C, NULL, bolyplus1, signnode, longcon(0), TypeLong::LONG));
     } else {
       IfNode *ifyplus1 = create_and_xform_if(ylong_path,bolyplus1, PROB_FAIR, COUNT_UNKNOWN);
       RegionNode *r = new (C) RegionNode(3);
       Node *phi = new (C) PhiNode(r, TypeLong::LONG);
       r->init_req(1, _gvn.transform(new (C) IfFalseNode(ifyplus1)));
       r->init_req(2, _gvn.transform(new (C) IfTrueNode(ifyplus1)));
       phi->init_req(1, signnode);
       phi->init_req(2, longcon(0));
       correctedsign = _gvn.transform(phi);
       ylong_path = _gvn.transform(r);
       record_for_igvn(r);
     }
     // zero node
     Node *conzero = longcon(0);
     // Check (1&(long)y)==0?
     Node *cmpeq1 = _gvn.transform(new (C) CmpLNode(correctedsign, conzero));
     // Check if (1&(long)y)!=0?, if so the result is negative
     Node *bol3 = _gvn.transform(new (C) BoolNode( cmpeq1, BoolTest::ne ));
     // abs(x)
     Node *absx=_gvn.transform(new (C) AbsDNode(x));
     // abs(x)^y
     Node *absxpowy = _gvn.transform(new (C) PowDNode(C, control(), absx, y));
     // -abs(x)^y
     Node *negabsxpowy = _gvn.transform(new (C) NegDNode (absxpowy));
     // (1&(long)y)==1?-DPow(abs(x), y):DPow(abs(x), y)
     Node *signresult = NULL;
     if (ConditionalMoveLimit != 0) {
       signresult = _gvn.transform( CMoveNode::make(C, NULL, bol3, absxpowy, negabsxpowy, Type::DOUBLE));
     } else {
       IfNode *ifyeven = create_and_xform_if(ylong_path,bol3, PROB_FAIR, COUNT_UNKNOWN);
       RegionNode *r = new (C) RegionNode(3);
       Node *phi = new (C) PhiNode(r, Type::DOUBLE);
       r->init_req(1, _gvn.transform(new (C) IfFalseNode(ifyeven)));
       r->init_req(2, _gvn.transform(new (C) IfTrueNode(ifyeven)));
       phi->init_req(1, absxpowy);
       phi->init_req(2, negabsxpowy);
       signresult = _gvn.transform(phi);
       ylong_path = _gvn.transform(r);
       record_for_igvn(r);
     }
     // Set complex path fast result
     r->init_req(2, ylong_path);
     phi->init_req(2, signresult);
     static const jlong nan_bits = CONST64(0x7ff8000000000000);
     Node *slow_result = makecon(TypeD::make(*(double*)&nan_bits)); // return NaN
     r->init_req(1,slow_path);
     phi->init_req(1,slow_result);
     // Post merge
     set_control(_gvn.transform(r));
     record_for_igvn(r);
     result = _gvn.transform(phi);
   }
   result = finish_pow_exp(result, x, y, OptoRuntime::Math_DD_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dpow), "POW");
   // control from finish_pow_exp is now input to the region node
   region_node->set_req(2, control());
   // the result from finish_pow_exp is now input to the phi node
   phi_node->init_req(2, result);
   set_control(_gvn.transform(region_node));
   record_for_igvn(region_node);
   set_result(_gvn.transform(phi_node));
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   return true;
 }
 //------------------------------runtime_math-----------------------------
 bool LibraryCallKit::runtime_math(const TypeFunc* call_type, address funcAddr, const char* funcName) {
   assert(call_type == OptoRuntime::Math_DD_D_Type() || call_type == OptoRuntime::Math_D_D_Type(),
          "must be (DD)D or (D)D type");
   // Inputs
   Node* a = round_double_node(argument(0));
   Node* b = (call_type == OptoRuntime::Math_DD_D_Type()) ? round_double_node(argument(2)) : NULL;
   const TypePtr* no_memory_effects = NULL;
   Node* trig = make_runtime_call(RC_LEAF, call_type, funcAddr, funcName,
                                  no_memory_effects,
                                  a, top(), b, b ? top() : NULL);
   Node* value = _gvn.transform(new (C) ProjNode(trig, TypeFunc::Parms+0));
 #ifdef ASSERT
   Node* value_top = _gvn.transform(new (C) ProjNode(trig, TypeFunc::Parms+1));
   assert(value_top == top(), "second value must be top");
 #endif
   set_result(value);
   return true;
 }
 //------------------------------inline_math_native-----------------------------
 bool LibraryCallKit::inline_math_native(vmIntrinsics::ID id) {
 #define FN_PTR(f) CAST_FROM_FN_PTR(address, f)
   switch (id) {
     // These intrinsics are not properly supported on all hardware
   case vmIntrinsics::_dcos:   return Matcher::has_match_rule(Op_CosD)   ? inline_trig(id) :
     runtime_math(OptoRuntime::Math_D_D_Type(), FN_PTR(SharedRuntime::dcos),   "COS");
   case vmIntrinsics::_dsin:   return Matcher::has_match_rule(Op_SinD)   ? inline_trig(id) :
     runtime_math(OptoRuntime::Math_D_D_Type(), FN_PTR(SharedRuntime::dsin),   "SIN");
   case vmIntrinsics::_dtan:   return Matcher::has_match_rule(Op_TanD)   ? inline_trig(id) :
     runtime_math(OptoRuntime::Math_D_D_Type(), FN_PTR(SharedRuntime::dtan),   "TAN");
   case vmIntrinsics::_dlog:   return Matcher::has_match_rule(Op_LogD)   ? inline_math(id) :
     runtime_math(OptoRuntime::Math_D_D_Type(), FN_PTR(SharedRuntime::dlog),   "LOG");
   case vmIntrinsics::_dlog10: return Matcher::has_match_rule(Op_Log10D) ? inline_math(id) :
     runtime_math(OptoRuntime::Math_D_D_Type(), FN_PTR(SharedRuntime::dlog10), "LOG10");
     // These intrinsics are supported on all hardware
   case vmIntrinsics::_dsqrt:  return Matcher::match_rule_supported(Op_SqrtD) ? inline_math(id) : false;
   case vmIntrinsics::_dabs:   return Matcher::has_match_rule(Op_AbsD)   ? inline_math(id) : false;
   case vmIntrinsics::_dexp:   return Matcher::has_match_rule(Op_ExpD)   ? inline_exp()    :
     runtime_math(OptoRuntime::Math_D_D_Type(),  FN_PTR(SharedRuntime::dexp),  "EXP");
   case vmIntrinsics::_dpow:   return Matcher::has_match_rule(Op_PowD)   ? inline_pow()    :
     runtime_math(OptoRuntime::Math_DD_D_Type(), FN_PTR(SharedRuntime::dpow),  "POW");
 #undef FN_PTR
    // These intrinsics are not yet correctly implemented
   case vmIntrinsics::_datan2:
     return false;
   default:
     fatal_unexpected_iid(id);
     return false;
   }
 }
 static bool is_simple_name(Node* n) {
   return (n->req() == 1         // constant
           || (n->is_Type() && n->as_Type()->type()->singleton())
           || n->is_Proj()       // parameter or return value
           || n->is_Phi()        // local of some sort
           );
 }
 //----------------------------inline_min_max-----------------------------------
 bool LibraryCallKit::inline_min_max(vmIntrinsics::ID id) {
   set_result(generate_min_max(id, argument(0), argument(1)));
   return true;
 }
 void LibraryCallKit::inline_math_mathExact(Node* math, Node *test) {
   Node* bol = _gvn.transform( new (C) BoolNode(test, BoolTest::overflow) );
   IfNode* check = create_and_map_if(control(), bol, PROB_UNLIKELY_MAG(3), COUNT_UNKNOWN);
   Node* fast_path = _gvn.transform( new (C) IfFalseNode(check));
   Node* slow_path = _gvn.transform( new (C) IfTrueNode(check) );
   {
     PreserveJVMState pjvms(this);
     PreserveReexecuteState preexecs(this);
     jvms()->set_should_reexecute(true);
     set_control(slow_path);
     set_i_o(i_o());
     uncommon_trap(Deoptimization::Reason_intrinsic,
                   Deoptimization::Action_none);
   }
   set_control(fast_path);
   set_result(math);
 }
 template <typename OverflowOp>
 bool LibraryCallKit::inline_math_overflow(Node* arg1, Node* arg2) {
   typedef typename OverflowOp::MathOp MathOp;
   MathOp* mathOp = new(C) MathOp(arg1, arg2);
   Node* operation = _gvn.transform( mathOp );
   Node* ofcheck = _gvn.transform( new(C) OverflowOp(arg1, arg2) );
   inline_math_mathExact(operation, ofcheck);
   return true;
 }
 bool LibraryCallKit::inline_math_addExactI(bool is_increment) {
   return inline_math_overflow<OverflowAddINode>(argument(0), is_increment ? intcon(1) : argument(1));
 }
 bool LibraryCallKit::inline_math_addExactL(bool is_increment) {
   return inline_math_overflow<OverflowAddLNode>(argument(0), is_increment ? longcon(1) : argument(2));
 }
 bool LibraryCallKit::inline_math_subtractExactI(bool is_decrement) {
   return inline_math_overflow<OverflowSubINode>(argument(0), is_decrement ? intcon(1) : argument(1));
 }
 bool LibraryCallKit::inline_math_subtractExactL(bool is_decrement) {
   return inline_math_overflow<OverflowSubLNode>(argument(0), is_decrement ? longcon(1) : argument(2));
 }
 bool LibraryCallKit::inline_math_negateExactI() {
   return inline_math_overflow<OverflowSubINode>(intcon(0), argument(0));
 }
 bool LibraryCallKit::inline_math_negateExactL() {
   return inline_math_overflow<OverflowSubLNode>(longcon(0), argument(0));
 }
 bool LibraryCallKit::inline_math_multiplyExactI() {
   return inline_math_overflow<OverflowMulINode>(argument(0), argument(1));
 }
 bool LibraryCallKit::inline_math_multiplyExactL() {
   return inline_math_overflow<OverflowMulLNode>(argument(0), argument(2));
 }
 Node*
 LibraryCallKit::generate_min_max(vmIntrinsics::ID id, Node* x0, Node* y0) {
   // These are the candidate return value:
   Node* xvalue = x0;
   Node* yvalue = y0;
   if (xvalue == yvalue) {
     return xvalue;
   }
   bool want_max = (id == vmIntrinsics::_max);
   const TypeInt* txvalue = _gvn.type(xvalue)->isa_int();
   const TypeInt* tyvalue = _gvn.type(yvalue)->isa_int();
   if (txvalue == NULL || tyvalue == NULL)  return top();
   // This is not really necessary, but it is consistent with a
   // hypothetical MaxINode::Value method:
   int widen = MAX2(txvalue->_widen, tyvalue->_widen);
   // %%% This folding logic should (ideally) be in a different place.
   // Some should be inside IfNode, and there to be a more reliable
   // transformation of ?: style patterns into cmoves.  We also want
   // more powerful optimizations around cmove and min/max.
   // Try to find a dominating comparison of these guys.
   // It can simplify the index computation for Arrays.copyOf
   // and similar uses of System.arraycopy.
   // First, compute the normalized version of CmpI(x, y).
   int   cmp_op = Op_CmpI;
   Node* xkey = xvalue;
   Node* ykey = yvalue;
   Node* ideal_cmpxy = _gvn.transform(new(C) CmpINode(xkey, ykey));
   if (ideal_cmpxy->is_Cmp()) {
     // E.g., if we have CmpI(length - offset, count),
     // it might idealize to CmpI(length, count + offset)
     cmp_op = ideal_cmpxy->Opcode();
     xkey = ideal_cmpxy->in(1);
     ykey = ideal_cmpxy->in(2);
   }
   // Start by locating any relevant comparisons.
   Node* start_from = (xkey->outcnt() < ykey->outcnt()) ? xkey : ykey;
   Node* cmpxy = NULL;
   Node* cmpyx = NULL;
   for (DUIterator_Fast kmax, k = start_from->fast_outs(kmax); k < kmax; k++) {
     Node* cmp = start_from->fast_out(k);
     if (cmp->outcnt() > 0 &&            // must have prior uses
         cmp->in(0) == NULL &&           // must be context-independent
         cmp->Opcode() == cmp_op) {      // right kind of compare
       if (cmp->in(1) == xkey && cmp->in(2) == ykey)  cmpxy = cmp;
       if (cmp->in(1) == ykey && cmp->in(2) == xkey)  cmpyx = cmp;
     }
   }
   const int NCMPS = 2;
   Node* cmps[NCMPS] = { cmpxy, cmpyx };
   int cmpn;
   for (cmpn = 0; cmpn < NCMPS; cmpn++) {
     if (cmps[cmpn] != NULL)  break;     // find a result
   }
   if (cmpn < NCMPS) {
     // Look for a dominating test that tells us the min and max.
     int depth = 0;                // Limit search depth for speed
     Node* dom = control();
     for (; dom != NULL; dom = IfNode::up_one_dom(dom, true)) {
       if (++depth >= 100)  break;
       Node* ifproj = dom;
       if (!ifproj->is_Proj())  continue;
       Node* iff = ifproj->in(0);
       if (!iff->is_If())  continue;
       Node* bol = iff->in(1);
       if (!bol->is_Bool())  continue;
       Node* cmp = bol->in(1);
       if (cmp == NULL)  continue;
       for (cmpn = 0; cmpn < NCMPS; cmpn++)
         if (cmps[cmpn] == cmp)  break;
       if (cmpn == NCMPS)  continue;
       BoolTest::mask btest = bol->as_Bool()->_test._test;
       if (ifproj->is_IfFalse())  btest = BoolTest(btest).negate();
       if (cmp->in(1) == ykey)    btest = BoolTest(btest).commute();
       // At this point, we know that 'x btest y' is true.
       switch (btest) {
       case BoolTest::eq:
         // They are proven equal, so we can collapse the min/max.
         // Either value is the answer.  Choose the simpler.
         if (is_simple_name(yvalue) && !is_simple_name(xvalue))
           return yvalue;
         return xvalue;
       case BoolTest::lt:          // x < y
       case BoolTest::le:          // x <= y
         return (want_max ? yvalue : xvalue);
       case BoolTest::gt:          // x > y
       case BoolTest::ge:          // x >= y
         return (want_max ? xvalue : yvalue);
       }
     }
   }
   // We failed to find a dominating test.
   // Let's pick a test that might GVN with prior tests.
   Node*          best_bol   = NULL;
   BoolTest::mask best_btest = BoolTest::illegal;
   for (cmpn = 0; cmpn < NCMPS; cmpn++) {
     Node* cmp = cmps[cmpn];
     if (cmp == NULL)  continue;
     for (DUIterator_Fast jmax, j = cmp->fast_outs(jmax); j < jmax; j++) {
       Node* bol = cmp->fast_out(j);
       if (!bol->is_Bool())  continue;
       BoolTest::mask btest = bol->as_Bool()->_test._test;
       if (btest == BoolTest::eq || btest == BoolTest::ne)  continue;
       if (cmp->in(1) == ykey)   btest = BoolTest(btest).commute();
       if (bol->outcnt() > (best_bol == NULL ? 0 : best_bol->outcnt())) {
         best_bol   = bol->as_Bool();
         best_btest = btest;
       }
     }
   }
   Node* answer_if_true  = NULL;
   Node* answer_if_false = NULL;
   switch (best_btest) {
   default:
     if (cmpxy == NULL)
       cmpxy = ideal_cmpxy;
     best_bol = _gvn.transform(new(C) BoolNode(cmpxy, BoolTest::lt));
     // and fall through:
   case BoolTest::lt:          // x < y
   case BoolTest::le:          // x <= y
     answer_if_true  = (want_max ? yvalue : xvalue);
     answer_if_false = (want_max ? xvalue : yvalue);
     break;
   case BoolTest::gt:          // x > y
   case BoolTest::ge:          // x >= y
     answer_if_true  = (want_max ? xvalue : yvalue);
     answer_if_false = (want_max ? yvalue : xvalue);
     break;
   }
   jint hi, lo;
   if (want_max) {
     // We can sharpen the minimum.
     hi = MAX2(txvalue->_hi, tyvalue->_hi);
     lo = MAX2(txvalue->_lo, tyvalue->_lo);
   } else {
     // We can sharpen the maximum.
     hi = MIN2(txvalue->_hi, tyvalue->_hi);
     lo = MIN2(txvalue->_lo, tyvalue->_lo);
   }
   // Use a flow-free graph structure, to avoid creating excess control edges
   // which could hinder other optimizations.
   // Since Math.min/max is often used with arraycopy, we want
   // tightly_coupled_allocation to be able to see beyond min/max expressions.
   Node* cmov = CMoveNode::make(C, NULL, best_bol,
                                answer_if_false, answer_if_true,
                                TypeInt::make(lo, hi, widen));
   return _gvn.transform(cmov);
   /*
   // This is not as desirable as it may seem, since Min and Max
   // nodes do not have a full set of optimizations.
   // And they would interfere, anyway, with 'if' optimizations
   // and with CMoveI canonical forms.
   switch (id) {
   case vmIntrinsics::_min:
     result_val = _gvn.transform(new (C, 3) MinINode(x,y)); break;
   case vmIntrinsics::_max:
     result_val = _gvn.transform(new (C, 3) MaxINode(x,y)); break;
   default:
     ShouldNotReachHere();
   }
   */
 }
 inline int
 LibraryCallKit::classify_unsafe_addr(Node* &base, Node* &offset) {
   const TypePtr* base_type = TypePtr::NULL_PTR;
   if (base != NULL)  base_type = _gvn.type(base)->isa_ptr();
   if (base_type == NULL) {
     // Unknown type.
     return Type::AnyPtr;
   } else if (base_type == TypePtr::NULL_PTR) {
     // Since this is a NULL+long form, we have to switch to a rawptr.
     base   = _gvn.transform(new (C) CastX2PNode(offset));
     offset = MakeConX(0);
     return Type::RawPtr;
   } else if (base_type->base() == Type::RawPtr) {
     return Type::RawPtr;
   } else if (base_type->isa_oopptr()) {
     // Base is never null => always a heap address.
     if (base_type->ptr() == TypePtr::NotNull) {
       return Type::OopPtr;
     }
     // Offset is small => always a heap address.
     const TypeX* offset_type = _gvn.type(offset)->isa_intptr_t();
     if (offset_type != NULL &&
         base_type->offset() == 0 &&     // (should always be?)
         offset_type->_lo >= 0 &&
         !MacroAssembler::needs_explicit_null_check(offset_type->_hi)) {
       return Type::OopPtr;
     }
     // Otherwise, it might either be oop+off or NULL+addr.
     return Type::AnyPtr;
   } else {
     // No information:
     return Type::AnyPtr;
   }
 }
 inline Node* LibraryCallKit::make_unsafe_address(Node* base, Node* offset) {
   int kind = classify_unsafe_addr(base, offset);
   if (kind == Type::RawPtr) {
     return basic_plus_adr(top(), base, offset);
   } else {
     return basic_plus_adr(base, offset);
   }
 }
 //--------------------------inline_number_methods-----------------------------
 // inline int     Integer.numberOfLeadingZeros(int)
 // inline int        Long.numberOfLeadingZeros(long)
 //
 // inline int     Integer.numberOfTrailingZeros(int)
 // inline int        Long.numberOfTrailingZeros(long)
 //
 // inline int     Integer.bitCount(int)
 // inline int        Long.bitCount(long)
 //
 // inline char  Character.reverseBytes(char)
 // inline short     Short.reverseBytes(short)
 // inline int     Integer.reverseBytes(int)
 // inline long       Long.reverseBytes(long)
 bool LibraryCallKit::inline_number_methods(vmIntrinsics::ID id) {
   Node* arg = argument(0);
   Node* n;
   switch (id) {
   case vmIntrinsics::_numberOfLeadingZeros_i:   n = new (C) CountLeadingZerosINode( arg);  break;
   case vmIntrinsics::_numberOfLeadingZeros_l:   n = new (C) CountLeadingZerosLNode( arg);  break;
   case vmIntrinsics::_numberOfTrailingZeros_i:  n = new (C) CountTrailingZerosINode(arg);  break;
   case vmIntrinsics::_numberOfTrailingZeros_l:  n = new (C) CountTrailingZerosLNode(arg);  break;
   case vmIntrinsics::_bitCount_i:               n = new (C) PopCountINode(          arg);  break;
   case vmIntrinsics::_bitCount_l:               n = new (C) PopCountLNode(          arg);  break;
   case vmIntrinsics::_reverseBytes_c:           n = new (C) ReverseBytesUSNode(0,   arg);  break;
   case vmIntrinsics::_reverseBytes_s:           n = new (C) ReverseBytesSNode( 0,   arg);  break;
   case vmIntrinsics::_reverseBytes_i:           n = new (C) ReverseBytesINode( 0,   arg);  break;
   case vmIntrinsics::_reverseBytes_l:           n = new (C) ReverseBytesLNode( 0,   arg);  break;
   default:  fatal_unexpected_iid(id);  break;
   }
   set_result(_gvn.transform(n));
   return true;
 }
 //----------------------------inline_unsafe_access----------------------------
 const static BasicType T_ADDRESS_HOLDER = T_LONG;
 // Helper that guards and inserts a pre-barrier.
 void LibraryCallKit::insert_pre_barrier(Node* base_oop, Node* offset,
                                         Node* pre_val, bool need_mem_bar) {
   // We could be accessing the referent field of a reference object. If so, when G1
   // is enabled, we need to log the value in the referent field in an SATB buffer.
   // This routine performs some compile time filters and generates suitable
   // runtime filters that guard the pre-barrier code.
   // Also add memory barrier for non volatile load from the referent field
   // to prevent commoning of loads across safepoint.
   if (!UseG1GC && !need_mem_bar)
     return;
   // Some compile time checks.
   // If offset is a constant, is it java_lang_ref_Reference::_reference_offset?
   const TypeX* otype = offset->find_intptr_t_type();
   if (otype != NULL && otype->is_con() &&
       otype->get_con() != java_lang_ref_Reference::referent_offset) {
     // Constant offset but not the reference_offset so just return
     return;
   }
   // We only need to generate the runtime guards for instances.
   const TypeOopPtr* btype = base_oop->bottom_type()->isa_oopptr();
   if (btype != NULL) {
     if (btype->isa_aryptr()) {
       // Array type so nothing to do
       return;
     }
     const TypeInstPtr* itype = btype->isa_instptr();
     if (itype != NULL) {
       // Can the klass of base_oop be statically determined to be
       // _not_ a sub-class of Reference and _not_ Object?
       ciKlass* klass = itype->klass();
       if ( klass->is_loaded() &&
           !klass->is_subtype_of(env()->Reference_klass()) &&
           !env()->Object_klass()->is_subtype_of(klass)) {
         return;
       }
     }
   }
   // The compile time filters did not reject base_oop/offset so
   // we need to generate the following runtime filters
   //
   // if (offset == java_lang_ref_Reference::_reference_offset) {
   //   if (instance_of(base, java.lang.ref.Reference)) {
   //     pre_barrier(_, pre_val, ...);
   //   }
   // }
   float likely   = PROB_LIKELY(  0.999);
   float unlikely = PROB_UNLIKELY(0.999);
   IdealKit ideal(this);
 #define __ ideal.
   Node* referent_off = __ ConX(java_lang_ref_Reference::referent_offset);
   __ if_then(offset, BoolTest::eq, referent_off, unlikely); {
       // Update graphKit memory and control from IdealKit.
       sync_kit(ideal);
       Node* ref_klass_con = makecon(TypeKlassPtr::make(env()->Reference_klass()));
       Node* is_instof = gen_instanceof(base_oop, ref_klass_con);
       // Update IdealKit memory and control from graphKit.
       __ sync_kit(this);
       Node* one = __ ConI(1);
       // is_instof == 0 if base_oop == NULL
       __ if_then(is_instof, BoolTest::eq, one, unlikely); {
         // Update graphKit from IdeakKit.
         sync_kit(ideal);
         // Use the pre-barrier to record the value in the referent field
         pre_barrier(false /* do_load */,
                     __ ctrl(),
                     NULL /* obj */, NULL /* adr */, max_juint /* alias_idx */, NULL /* val */, NULL /* val_type */,
                     pre_val /* pre_val */,
                     T_OBJECT);
         if (need_mem_bar) {
           // Add memory barrier to prevent commoning reads from this field
           // across safepoint since GC can change its value.
           insert_mem_bar(Op_MemBarCPUOrder);
         }
         // Update IdealKit from graphKit.
         __ sync_kit(this);
       } __ end_if(); // _ref_type != ref_none
   } __ end_if(); // offset == referent_offset
   // Final sync IdealKit and GraphKit.
   final_sync(ideal);
 #undef __
 }
 // Interpret Unsafe.fieldOffset cookies correctly:
 extern jlong Unsafe_field_offset_to_byte_offset(jlong field_offset);
 const TypeOopPtr* LibraryCallKit::sharpen_unsafe_type(Compile::AliasType* alias_type, const TypePtr *adr_type, bool is_native_ptr) {
   // Attempt to infer a sharper value type from the offset and base type.
   ciKlass* sharpened_klass = NULL;
   // See if it is an instance field, with an object type.
   if (alias_type->field() != NULL) {
     assert(!is_native_ptr, "native pointer op cannot use a java address");
     if (alias_type->field()->type()->is_klass()) {
       sharpened_klass = alias_type->field()->type()->as_klass();
     }
   }
   // See if it is a narrow oop array.
   if (adr_type->isa_aryptr()) {
     if (adr_type->offset() >= objArrayOopDesc::base_offset_in_bytes()) {
       const TypeOopPtr *elem_type = adr_type->is_aryptr()->elem()->isa_oopptr();
       if (elem_type != NULL) {
         sharpened_klass = elem_type->klass();
       }
     }
   }
   // The sharpened class might be unloaded if there is no class loader
   // contraint in place.
   if (sharpened_klass != NULL && sharpened_klass->is_loaded()) {
     const TypeOopPtr* tjp = TypeOopPtr::make_from_klass(sharpened_klass);
 #ifndef PRODUCT
     if (C->print_intrinsics() || C->print_inlining()) {
       tty->print("  from base type: ");  adr_type->dump();
       tty->print("  sharpened value: ");  tjp->dump();
     }
 #endif
     // Sharpen the value type.
     return tjp;
   }
   return NULL;
 }
 bool LibraryCallKit::inline_unsafe_access(bool is_native_ptr, bool is_store, BasicType type, bool is_volatile) {
   if (callee()->is_static())  return false;  // caller must have the capability!
 #ifndef PRODUCT
   {
     ResourceMark rm;
     // Check the signatures.
     ciSignature* sig = callee()->signature();
 #ifdef ASSERT
     if (!is_store) {
       // Object getObject(Object base, int/long offset), etc.
       BasicType rtype = sig->return_type()->basic_type();
       if (rtype == T_ADDRESS_HOLDER && callee()->name() == ciSymbol::getAddress_name())
           rtype = T_ADDRESS;  // it is really a C void*
       assert(rtype == type, "getter must return the expected value");
       if (!is_native_ptr) {
         assert(sig->count() == 2, "oop getter has 2 arguments");
         assert(sig->type_at(0)->basic_type() == T_OBJECT, "getter base is object");
         assert(sig->type_at(1)->basic_type() == T_LONG, "getter offset is correct");
       } else {
         assert(sig->count() == 1, "native getter has 1 argument");
         assert(sig->type_at(0)->basic_type() == T_LONG, "getter base is long");
       }
     } else {
       // void putObject(Object base, int/long offset, Object x), etc.
       assert(sig->return_type()->basic_type() == T_VOID, "putter must not return a value");
       if (!is_native_ptr) {
         assert(sig->count() == 3, "oop putter has 3 arguments");
         assert(sig->type_at(0)->basic_type() == T_OBJECT, "putter base is object");
         assert(sig->type_at(1)->basic_type() == T_LONG, "putter offset is correct");
       } else {
         assert(sig->count() == 2, "native putter has 2 arguments");
         assert(sig->type_at(0)->basic_type() == T_LONG, "putter base is long");
       }
       BasicType vtype = sig->type_at(sig->count()-1)->basic_type();
       if (vtype == T_ADDRESS_HOLDER && callee()->name() == ciSymbol::putAddress_name())
         vtype = T_ADDRESS;  // it is really a C void*
       assert(vtype == type, "putter must accept the expected value");
     }
 #endif // ASSERT
  }
 #endif //PRODUCT
   C->set_has_unsafe_access(true);  // Mark eventual nmethod as "unsafe".
   Node* receiver = argument(0);  // type: oop
   // Build address expression.  See the code in inline_unsafe_prefetch.
   Node* adr;
   Node* heap_base_oop = top();
   Node* offset = top();
   Node* val;
   if (!is_native_ptr) {
     // The base is either a Java object or a value produced by Unsafe.staticFieldBase
     Node* base = argument(1);  // type: oop
     // The offset is a value produced by Unsafe.staticFieldOffset or Unsafe.objectFieldOffset
     offset = argument(2);  // type: long
     // We currently rely on the cookies produced by Unsafe.xxxFieldOffset
     // to be plain byte offsets, which are also the same as those accepted
     // by oopDesc::field_base.
     assert(Unsafe_field_offset_to_byte_offset(11) == 11,
            "fieldOffset must be byte-scaled");
     // 32-bit machines ignore the high half!
     offset = ConvL2X(offset);
     adr = make_unsafe_address(base, offset);
     heap_base_oop = base;
     val = is_store ? argument(4) : NULL;
   } else {
     Node* ptr = argument(1);  // type: long
     ptr = ConvL2X(ptr);  // adjust Java long to machine word
     adr = make_unsafe_address(NULL, ptr);
     val = is_store ? argument(3) : NULL;
   }
   const TypePtr *adr_type = _gvn.type(adr)->isa_ptr();
   // First guess at the value type.
   const Type *value_type = Type::get_const_basic_type(type);
   // Try to categorize the address.  If it comes up as TypeJavaPtr::BOTTOM,
   // there was not enough information to nail it down.
   Compile::AliasType* alias_type = C->alias_type(adr_type);
   assert(alias_type->index() != Compile::AliasIdxBot, "no bare pointers here");
   // We will need memory barriers unless we can determine a unique
   // alias category for this reference.  (Note:  If for some reason
   // the barriers get omitted and the unsafe reference begins to "pollute"
   // the alias analysis of the rest of the graph, either Compile::can_alias
   // or Compile::must_alias will throw a diagnostic assert.)
   bool need_mem_bar = (alias_type->adr_type() == TypeOopPtr::BOTTOM);
   // If we are reading the value of the referent field of a Reference
   // object (either by using Unsafe directly or through reflection)
   // then, if G1 is enabled, we need to record the referent in an
   // SATB log buffer using the pre-barrier mechanism.
   // Also we need to add memory barrier to prevent commoning reads
   // from this field across safepoint since GC can change its value.
   bool need_read_barrier = !is_native_ptr && !is_store &&
                            offset != top() && heap_base_oop != top();
   if (!is_store && type == T_OBJECT) {
     const TypeOopPtr* tjp = sharpen_unsafe_type(alias_type, adr_type, is_native_ptr);
     if (tjp != NULL) {
       value_type = tjp;
     }
   }
   receiver = null_check(receiver);
   if (stopped()) {
     return true;
   }
   // Heap pointers get a null-check from the interpreter,
   // as a courtesy.  However, this is not guaranteed by Unsafe,
   // and it is not possible to fully distinguish unintended nulls
   // from intended ones in this API.
   if (is_volatile) {
     // We need to emit leading and trailing CPU membars (see below) in
     // addition to memory membars when is_volatile. This is a little
     // too strong, but avoids the need to insert per-alias-type
     // volatile membars (for stores; compare Parse::do_put_xxx), which
     // we cannot do effectively here because we probably only have a
     // rough approximation of type.
     need_mem_bar = true;
     // For Stores, place a memory ordering barrier now.
     if (is_store) {
       insert_mem_bar(Op_MemBarRelease);
     } else {
       if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
         insert_mem_bar(Op_MemBarVolatile);
       }
     }
   }
   // Memory barrier to prevent normal and 'unsafe' accesses from
   // bypassing each other.  Happens after null checks, so the
   // exception paths do not take memory state from the memory barrier,
   // so there's no problems making a strong assert about mixing users
   // of safe & unsafe memory.  Otherwise fails in a CTW of rt.jar
   // around 5701, class sun/reflect/UnsafeBooleanFieldAccessorImpl.
   if (need_mem_bar) insert_mem_bar(Op_MemBarCPUOrder);
   if (!is_store) {
     Node* p = make_load(control(), adr, value_type, type, adr_type, MemNode::unordered, is_volatile);
     // load value
     switch (type) {
     case T_BOOLEAN:
     case T_CHAR:
     case T_BYTE:
     case T_SHORT:
     case T_INT:
     case T_LONG:
     case T_FLOAT:
     case T_DOUBLE:
       break;
     case T_OBJECT:
       if (need_read_barrier) {
         insert_pre_barrier(heap_base_oop, offset, p, !(is_volatile || need_mem_bar));
       }
       break;
     case T_ADDRESS:
       // Cast to an int type.
       p = _gvn.transform(new (C) CastP2XNode(NULL, p));
       p = ConvX2UL(p);
       break;
     default:
       fatal(err_msg_res("unexpected type %d: %s", type, type2name(type)));
       break;
     }
     // The load node has the control of the preceding MemBarCPUOrder.  All
     // following nodes will have the control of the MemBarCPUOrder inserted at
     // the end of this method.  So, pushing the load onto the stack at a later
     // point is fine.
     set_result(p);
   } else {
     // place effect of store into memory
     switch (type) {
     case T_DOUBLE:
       val = dstore_rounding(val);
       break;
     case T_ADDRESS:
       // Repackage the long as a pointer.
       val = ConvL2X(val);
       val = _gvn.transform(new (C) CastX2PNode(val));
       break;
     }
     MemNode::MemOrd mo = is_volatile ? MemNode::release : MemNode::unordered;
     if (type != T_OBJECT ) {
       (void) store_to_memory(control(), adr, val, type, adr_type, mo, is_volatile);
     } else {
       // Possibly an oop being stored to Java heap or native memory
       if (!TypePtr::NULL_PTR->higher_equal(_gvn.type(heap_base_oop))) {
         // oop to Java heap.
         (void) store_oop_to_unknown(control(), heap_base_oop, adr, adr_type, val, type, mo);
       } else {
         // We can't tell at compile time if we are storing in the Java heap or outside
         // of it. So we need to emit code to conditionally do the proper type of
         // store.
         IdealKit ideal(this);
 #define __ ideal.
         // QQQ who knows what probability is here??
         __ if_then(heap_base_oop, BoolTest::ne, null(), PROB_UNLIKELY(0.999)); {
           // Sync IdealKit and graphKit.
           sync_kit(ideal);
           Node* st = store_oop_to_unknown(control(), heap_base_oop, adr, adr_type, val, type, mo);
           // Update IdealKit memory.
           __ sync_kit(this);
         } __ else_(); {
           __ store(__ ctrl(), adr, val, type, alias_type->index(), mo, is_volatile);
         } __ end_if();
         // Final sync IdealKit and GraphKit.
         final_sync(ideal);
 #undef __
       }
     }
   }
   if (is_volatile) {
     if (!is_store) {
       insert_mem_bar(Op_MemBarAcquire);
     } else {
       if (!support_IRIW_for_not_multiple_copy_atomic_cpu) {
         insert_mem_bar(Op_MemBarVolatile);
       }
     }
   }
   if (need_mem_bar) insert_mem_bar(Op_MemBarCPUOrder);
   return true;
 }
 //----------------------------inline_unsafe_prefetch----------------------------
 bool LibraryCallKit::inline_unsafe_prefetch(bool is_native_ptr, bool is_store, bool is_static) {
 #ifndef PRODUCT
   {
     ResourceMark rm;
     // Check the signatures.
     ciSignature* sig = callee()->signature();
 #ifdef ASSERT
     // Object getObject(Object base, int/long offset), etc.
     BasicType rtype = sig->return_type()->basic_type();
     if (!is_native_ptr) {
       assert(sig->count() == 2, "oop prefetch has 2 arguments");
       assert(sig->type_at(0)->basic_type() == T_OBJECT, "prefetch base is object");
       assert(sig->type_at(1)->basic_type() == T_LONG, "prefetcha offset is correct");
     } else {
       assert(sig->count() == 1, "native prefetch has 1 argument");
       assert(sig->type_at(0)->basic_type() == T_LONG, "prefetch base is long");
     }
 #endif // ASSERT
   }
 #endif // !PRODUCT
   C->set_has_unsafe_access(true);  // Mark eventual nmethod as "unsafe".
   const int idx = is_static ? 0 : 1;
   if (!is_static) {
     null_check_receiver();
     if (stopped()) {
       return true;
     }
   }
   // Build address expression.  See the code in inline_unsafe_access.
   Node *adr;
   if (!is_native_ptr) {
     // The base is either a Java object or a value produced by Unsafe.staticFieldBase
     Node* base   = argument(idx + 0);  // type: oop
     // The offset is a value produced by Unsafe.staticFieldOffset or Unsafe.objectFieldOffset
     Node* offset = argument(idx + 1);  // type: long
     // We currently rely on the cookies produced by Unsafe.xxxFieldOffset
     // to be plain byte offsets, which are also the same as those accepted
     // by oopDesc::field_base.
     assert(Unsafe_field_offset_to_byte_offset(11) == 11,
            "fieldOffset must be byte-scaled");
     // 32-bit machines ignore the high half!
     offset = ConvL2X(offset);
     adr = make_unsafe_address(base, offset);
   } else {
     Node* ptr = argument(idx + 0);  // type: long
     ptr = ConvL2X(ptr);  // adjust Java long to machine word
     adr = make_unsafe_address(NULL, ptr);
   }
   // Generate the read or write prefetch
   Node *prefetch;
   if (is_store) {
     prefetch = new (C) PrefetchWriteNode(i_o(), adr);
   } else {
     prefetch = new (C) PrefetchReadNode(i_o(), adr);
   }
   prefetch->init_req(0, control());
   set_i_o(_gvn.transform(prefetch));
   return true;
 }
 //----------------------------inline_unsafe_load_store----------------------------
 // This method serves a couple of different customers (depending on LoadStoreKind):
 //
 // LS_cmpxchg:
 //   public final native boolean compareAndSwapObject(Object o, long offset, Object expected, Object x);
 //   public final native boolean compareAndSwapInt(   Object o, long offset, int    expected, int    x);
 //   public final native boolean compareAndSwapLong(  Object o, long offset, long   expected, long   x);
 //
 // LS_xadd:
 //   public int  getAndAddInt( Object o, long offset, int  delta)
 //   public long getAndAddLong(Object o, long offset, long delta)
 //
 // LS_xchg:
 //   int    getAndSet(Object o, long offset, int    newValue)
 //   long   getAndSet(Object o, long offset, long   newValue)
 //   Object getAndSet(Object o, long offset, Object newValue)
 //
 bool LibraryCallKit::inline_unsafe_load_store(BasicType type, LoadStoreKind kind) {
   // This basic scheme here is the same as inline_unsafe_access, but
   // differs in enough details that combining them would make the code
   // overly confusing.  (This is a true fact! I originally combined
   // them, but even I was confused by it!) As much code/comments as
   // possible are retained from inline_unsafe_access though to make
   // the correspondences clearer. - dl
   if (callee()->is_static())  return false;  // caller must have the capability!
 #ifndef PRODUCT
   BasicType rtype;
   {
     ResourceMark rm;
     // Check the signatures.
     ciSignature* sig = callee()->signature();
     rtype = sig->return_type()->basic_type();
     if (kind == LS_xadd || kind == LS_xchg) {
       // Check the signatures.
 #ifdef ASSERT
       assert(rtype == type, "get and set must return the expected type");
       assert(sig->count() == 3, "get and set has 3 arguments");
       assert(sig->type_at(0)->basic_type() == T_OBJECT, "get and set base is object");
       assert(sig->type_at(1)->basic_type() == T_LONG, "get and set offset is long");
       assert(sig->type_at(2)->basic_type() == type, "get and set must take expected type as new value/delta");
 #endif // ASSERT
     } else if (kind == LS_cmpxchg) {
       // Check the signatures.
 #ifdef ASSERT
       assert(rtype == T_BOOLEAN, "CAS must return boolean");
       assert(sig->count() == 4, "CAS has 4 arguments");
       assert(sig->type_at(0)->basic_type() == T_OBJECT, "CAS base is object");
       assert(sig->type_at(1)->basic_type() == T_LONG, "CAS offset is long");
 #endif // ASSERT
     } else {
       ShouldNotReachHere();
     }
   }
 #endif //PRODUCT
   C->set_has_unsafe_access(true);  // Mark eventual nmethod as "unsafe".
   // Get arguments:
   Node* receiver = NULL;
   Node* base     = NULL;
   Node* offset   = NULL;
   Node* oldval   = NULL;
   Node* newval   = NULL;
   if (kind == LS_cmpxchg) {
     const bool two_slot_type = type2size[type] == 2;
     receiver = argument(0);  // type: oop
     base     = argument(1);  // type: oop
     offset   = argument(2);  // type: long
     oldval   = argument(4);  // type: oop, int, or long
     newval   = argument(two_slot_type ? 6 : 5);  // type: oop, int, or long
   } else if (kind == LS_xadd || kind == LS_xchg){
     receiver = argument(0);  // type: oop
     base     = argument(1);  // type: oop
     offset   = argument(2);  // type: long
     oldval   = NULL;
     newval   = argument(4);  // type: oop, int, or long
   }
   // Null check receiver.
   receiver = null_check(receiver);
   if (stopped()) {
     return true;
   }
   // Build field offset expression.
   // We currently rely on the cookies produced by Unsafe.xxxFieldOffset
   // to be plain byte offsets, which are also the same as those accepted
   // by oopDesc::field_base.
   assert(Unsafe_field_offset_to_byte_offset(11) == 11, "fieldOffset must be byte-scaled");
   // 32-bit machines ignore the high half of long offsets
   offset = ConvL2X(offset);
   Node* adr = make_unsafe_address(base, offset);
   const TypePtr *adr_type = _gvn.type(adr)->isa_ptr();
   // For CAS, unlike inline_unsafe_access, there seems no point in
   // trying to refine types. Just use the coarse types here.
   const Type *value_type = Type::get_const_basic_type(type);
   Compile::AliasType* alias_type = C->alias_type(adr_type);
   assert(alias_type->index() != Compile::AliasIdxBot, "no bare pointers here");
   if (kind == LS_xchg && type == T_OBJECT) {
     const TypeOopPtr* tjp = sharpen_unsafe_type(alias_type, adr_type);
     if (tjp != NULL) {
       value_type = tjp;
     }
   }
   int alias_idx = C->get_alias_index(adr_type);
   // Memory-model-wise, a LoadStore acts like a little synchronized
   // block, so needs barriers on each side.  These don't translate
   // into actual barriers on most machines, but we still need rest of
   // compiler to respect ordering.
   insert_mem_bar(Op_MemBarRelease);
   insert_mem_bar(Op_MemBarCPUOrder);
   // 4984716: MemBars must be inserted before this
   //          memory node in order to avoid a false
   //          dependency which will confuse the scheduler.
   Node *mem = memory(alias_idx);
   // For now, we handle only those cases that actually exist: ints,
   // longs, and Object. Adding others should be straightforward.
   Node* load_store;
   switch(type) {
   case T_INT:
     if (kind == LS_xadd) {
       load_store = _gvn.transform(new (C) GetAndAddINode(control(), mem, adr, newval, adr_type));
     } else if (kind == LS_xchg) {
       load_store = _gvn.transform(new (C) GetAndSetINode(control(), mem, adr, newval, adr_type));
     } else if (kind == LS_cmpxchg) {
       load_store = _gvn.transform(new (C) CompareAndSwapINode(control(), mem, adr, newval, oldval));
     } else {
       ShouldNotReachHere();
     }
     break;
   case T_LONG:
     if (kind == LS_xadd) {
       load_store = _gvn.transform(new (C) GetAndAddLNode(control(), mem, adr, newval, adr_type));
     } else if (kind == LS_xchg) {
       load_store = _gvn.transform(new (C) GetAndSetLNode(control(), mem, adr, newval, adr_type));
     } else if (kind == LS_cmpxchg) {
       load_store = _gvn.transform(new (C) CompareAndSwapLNode(control(), mem, adr, newval, oldval));
     } else {
       ShouldNotReachHere();
     }
     break;
   case T_OBJECT:
     // Transformation of a value which could be NULL pointer (CastPP #NULL)
     // could be delayed during Parse (for example, in adjust_map_after_if()).
     // Execute transformation here to avoid barrier generation in such case.
     if (_gvn.type(newval) == TypePtr::NULL_PTR)
       newval = _gvn.makecon(TypePtr::NULL_PTR);
     // Reference stores need a store barrier.
     if (kind == LS_xchg) {
       // If pre-barrier must execute before the oop store, old value will require do_load here.
       if (!can_move_pre_barrier()) {
         pre_barrier(true /* do_load*/,
                     control(), base, adr, alias_idx, newval, value_type->make_oopptr(),
                     NULL /* pre_val*/,
                     T_OBJECT);
       } // Else move pre_barrier to use load_store value, see below.
     } else if (kind == LS_cmpxchg) {
       // Same as for newval above:
       if (_gvn.type(oldval) == TypePtr::NULL_PTR) {
         oldval = _gvn.makecon(TypePtr::NULL_PTR);
       }
       // The only known value which might get overwritten is oldval.
       pre_barrier(false /* do_load */,
                   control(), NULL, NULL, max_juint, NULL, NULL,
                   oldval /* pre_val */,
                   T_OBJECT);
     } else {
       ShouldNotReachHere();
     }
 #ifdef _LP64
     if (adr->bottom_type()->is_ptr_to_narrowoop()) {
       Node *newval_enc = _gvn.transform(new (C) EncodePNode(newval, newval->bottom_type()->make_narrowoop()));
       if (kind == LS_xchg) {
         load_store = _gvn.transform(new (C) GetAndSetNNode(control(), mem, adr,
                                                            newval_enc, adr_type, value_type->make_narrowoop()));
       } else {
         assert(kind == LS_cmpxchg, "wrong LoadStore operation");
         Node *oldval_enc = _gvn.transform(new (C) EncodePNode(oldval, oldval->bottom_type()->make_narrowoop()));
         load_store = _gvn.transform(new (C) CompareAndSwapNNode(control(), mem, adr,
                                                                 newval_enc, oldval_enc));
       }
     } else
 #endif
     {
       if (kind == LS_xchg) {
         load_store = _gvn.transform(new (C) GetAndSetPNode(control(), mem, adr, newval, adr_type, value_type->is_oopptr()));
       } else {
         assert(kind == LS_cmpxchg, "wrong LoadStore operation");
         load_store = _gvn.transform(new (C) CompareAndSwapPNode(control(), mem, adr, newval, oldval));
       }
     }
     post_barrier(control(), load_store, base, adr, alias_idx, newval, T_OBJECT, true);
     break;
   default:
     fatal(err_msg_res("unexpected type %d: %s", type, type2name(type)));
     break;
   }
   // SCMemProjNodes represent the memory state of a LoadStore. Their
   // main role is to prevent LoadStore nodes from being optimized away
   // when their results aren't used.
   Node* proj = _gvn.transform(new (C) SCMemProjNode(load_store));
   set_memory(proj, alias_idx);
   if (type == T_OBJECT && kind == LS_xchg) {
 #ifdef _LP64
     if (adr->bottom_type()->is_ptr_to_narrowoop()) {
       load_store = _gvn.transform(new (C) DecodeNNode(load_store, load_store->get_ptr_type()));
     }
 #endif
     if (can_move_pre_barrier()) {
       // Don't need to load pre_val. The old value is returned by load_store.
       // The pre_barrier can execute after the xchg as long as no safepoint
       // gets inserted between them.
       pre_barrier(false /* do_load */,
                   control(), NULL, NULL, max_juint, NULL, NULL,
                   load_store /* pre_val */,
                   T_OBJECT);
     }
   }
   // Add the trailing membar surrounding the access
   insert_mem_bar(Op_MemBarCPUOrder);
   insert_mem_bar(Op_MemBarAcquire);
   assert(type2size[load_store->bottom_type()->basic_type()] == type2size[rtype], "result type should match");
   set_result(load_store);
   return true;
 }
 //----------------------------inline_unsafe_ordered_store----------------------
 // public native void sun.misc.Unsafe.putOrderedObject(Object o, long offset, Object x);
 // public native void sun.misc.Unsafe.putOrderedInt(Object o, long offset, int x);
 // public native void sun.misc.Unsafe.putOrderedLong(Object o, long offset, long x);
 bool LibraryCallKit::inline_unsafe_ordered_store(BasicType type) {
   // This is another variant of inline_unsafe_access, differing in
   // that it always issues store-store ("release") barrier and ensures
   // store-atomicity (which only matters for "long").
   if (callee()->is_static())  return false;  // caller must have the capability!
 #ifndef PRODUCT
   {
     ResourceMark rm;
     // Check the signatures.
     ciSignature* sig = callee()->signature();
 #ifdef ASSERT
     BasicType rtype = sig->return_type()->basic_type();
     assert(rtype == T_VOID, "must return void");
     assert(sig->count() == 3, "has 3 arguments");
     assert(sig->type_at(0)->basic_type() == T_OBJECT, "base is object");
     assert(sig->type_at(1)->basic_type() == T_LONG, "offset is long");
 #endif // ASSERT
   }
 #endif //PRODUCT
   C->set_has_unsafe_access(true);  // Mark eventual nmethod as "unsafe".
   // Get arguments:
   Node* receiver = argument(0);  // type: oop
   Node* base     = argument(1);  // type: oop
   Node* offset   = argument(2);  // type: long
   Node* val      = argument(4);  // type: oop, int, or long
   // Null check receiver.
   receiver = null_check(receiver);
   if (stopped()) {
     return true;
   }
   // Build field offset expression.
   assert(Unsafe_field_offset_to_byte_offset(11) == 11, "fieldOffset must be byte-scaled");
   // 32-bit machines ignore the high half of long offsets
   offset = ConvL2X(offset);
   Node* adr = make_unsafe_address(base, offset);
   const TypePtr *adr_type = _gvn.type(adr)->isa_ptr();
   const Type *value_type = Type::get_const_basic_type(type);
   Compile::AliasType* alias_type = C->alias_type(adr_type);
   insert_mem_bar(Op_MemBarRelease);
   insert_mem_bar(Op_MemBarCPUOrder);
   // Ensure that the store is atomic for longs:
   const bool require_atomic_access = true;
   Node* store;
   if (type == T_OBJECT) // reference stores need a store barrier.
     store = store_oop_to_unknown(control(), base, adr, adr_type, val, type, MemNode::release);
   else {
     store = store_to_memory(control(), adr, val, type, adr_type, MemNode::release, require_atomic_access);
   }
   insert_mem_bar(Op_MemBarCPUOrder);
   return true;
 }
 bool LibraryCallKit::inline_unsafe_fence(vmIntrinsics::ID id) {
   // Regardless of form, don't allow previous ld/st to move down,
   // then issue acquire, release, or volatile mem_bar.
   insert_mem_bar(Op_MemBarCPUOrder);
   switch(id) {
     case vmIntrinsics::_loadFence:
       insert_mem_bar(Op_LoadFence);
       return true;
     case vmIntrinsics::_storeFence:
       insert_mem_bar(Op_StoreFence);
       return true;
     case vmIntrinsics::_fullFence:
       insert_mem_bar(Op_MemBarVolatile);
       return true;
     default:
       fatal_unexpected_iid(id);
       return false;
   }
 }
 bool LibraryCallKit::klass_needs_init_guard(Node* kls) {
   if (!kls->is_Con()) {
     return true;
   }
   const TypeKlassPtr* klsptr = kls->bottom_type()->isa_klassptr();
   if (klsptr == NULL) {
     return true;
   }
   ciInstanceKlass* ik = klsptr->klass()->as_instance_klass();
   // don't need a guard for a klass that is already initialized
   return !ik->is_initialized();
 }
 //----------------------------inline_unsafe_allocate---------------------------
 // public native Object sun.misc.Unsafe.allocateInstance(Class<?> cls);
 bool LibraryCallKit::inline_unsafe_allocate() {
   if (callee()->is_static())  return false;  // caller must have the capability!
   null_check_receiver();  // null-check, then ignore
   Node* cls = null_check(argument(1));
   if (stopped())  return true;
   Node* kls = load_klass_from_mirror(cls, false, NULL, 0);
   kls = null_check(kls);
   if (stopped())  return true;  // argument was like int.class
   Node* test = NULL;
   if (LibraryCallKit::klass_needs_init_guard(kls)) {
     // Note:  The argument might still be an illegal value like
     // Serializable.class or Object[].class.   The runtime will handle it.
     // But we must make an explicit check for initialization.
     Node* insp = basic_plus_adr(kls, in_bytes(InstanceKlass::init_state_offset()));
     // Use T_BOOLEAN for InstanceKlass::_init_state so the compiler
     // can generate code to load it as unsigned byte.
     Node* inst = make_load(NULL, insp, TypeInt::UBYTE, T_BOOLEAN, MemNode::unordered);
     Node* bits = intcon(InstanceKlass::fully_initialized);
     test = _gvn.transform(new (C) SubINode(inst, bits));
     // The 'test' is non-zero if we need to take a slow path.
   }
   Node* obj = new_instance(kls, test);
   set_result(obj);
   return true;
 }
 #ifdef TRACE_HAVE_INTRINSICS
 /*
  * oop -> myklass
  * myklass->trace_id |= USED
  * return myklass->trace_id & ~0x3
  */
 bool LibraryCallKit::inline_native_classID() {
   null_check_receiver();  // null-check, then ignore
   Node* cls = null_check(argument(1), T_OBJECT);
   Node* kls = load_klass_from_mirror(cls, false, NULL, 0);
   kls = null_check(kls, T_OBJECT);
   ByteSize offset = TRACE_ID_OFFSET;
   Node* insp = basic_plus_adr(kls, in_bytes(offset));
   Node* tvalue = make_load(NULL, insp, TypeLong::LONG, T_LONG, MemNode::unordered);
   Node* bits = longcon(~0x03l); // ignore bit 0 & 1
   Node* andl = _gvn.transform(new (C) AndLNode(tvalue, bits));
   Node* clsused = longcon(0x01l); // set the class bit
   Node* orl = _gvn.transform(new (C) OrLNode(tvalue, clsused));
   const TypePtr *adr_type = _gvn.type(insp)->isa_ptr();
   store_to_memory(control(), insp, orl, T_LONG, adr_type, MemNode::unordered);
   set_result(andl);
   return true;
 }
 bool LibraryCallKit::inline_native_threadID() {
   Node* tls_ptr = NULL;
   Node* cur_thr = generate_current_thread(tls_ptr);
   Node* p = basic_plus_adr(top()/*!oop*/, tls_ptr, in_bytes(JavaThread::osthread_offset()));
   Node* osthread = make_load(NULL, p, TypeRawPtr::NOTNULL, T_ADDRESS, MemNode::unordered);
   p = basic_plus_adr(top()/*!oop*/, osthread, in_bytes(OSThread::thread_id_offset()));
   Node* threadid = NULL;
   size_t thread_id_size = OSThread::thread_id_size();
   if (thread_id_size == (size_t) BytesPerLong) {
     threadid = ConvL2I(make_load(control(), p, TypeLong::LONG, T_LONG, MemNode::unordered));
   } else if (thread_id_size == (size_t) BytesPerInt) {
     threadid = make_load(control(), p, TypeInt::INT, T_INT, MemNode::unordered);
   } else {
     ShouldNotReachHere();
   }
   set_result(threadid);
   return true;
 }
 #endif
 //------------------------inline_native_time_funcs--------------
 // inline code for System.currentTimeMillis() and System.nanoTime()
 // these have the same type and signature
 bool LibraryCallKit::inline_native_time_funcs(address funcAddr, const char* funcName) {
   const TypeFunc* tf = OptoRuntime::void_long_Type();
   const TypePtr* no_memory_effects = NULL;
   Node* time = make_runtime_call(RC_LEAF, tf, funcAddr, funcName, no_memory_effects);
   Node* value = _gvn.transform(new (C) ProjNode(time, TypeFunc::Parms+0));
 #ifdef ASSERT
   Node* value_top = _gvn.transform(new (C) ProjNode(time, TypeFunc::Parms+1));
   assert(value_top == top(), "second value must be top");
 #endif
   set_result(value);
   return true;
 }
 //------------------------inline_native_currentThread------------------
 bool LibraryCallKit::inline_native_currentThread() {
   Node* junk = NULL;
   set_result(generate_current_thread(junk));
   return true;
 }
 //------------------------inline_native_isInterrupted------------------
 // private native boolean java.lang.Thread.isInterrupted(boolean ClearInterrupted);
 bool LibraryCallKit::inline_native_isInterrupted() {
   // Add a fast path to t.isInterrupted(clear_int):
   //   (t == Thread.current() &&
   //    (!TLS._osthread._interrupted || WINDOWS_ONLY(false) NOT_WINDOWS(!clear_int)))
   //   ? TLS._osthread._interrupted : /*slow path:*/ t.isInterrupted(clear_int)
   // So, in the common case that the interrupt bit is false,
   // we avoid making a call into the VM.  Even if the interrupt bit
   // is true, if the clear_int argument is false, we avoid the VM call.
   // However, if the receiver is not currentThread, we must call the VM,
   // because there must be some locking done around the operation.
   // We only go to the fast case code if we pass two guards.
   // Paths which do not pass are accumulated in the slow_region.
   enum {
     no_int_result_path   = 1, // t == Thread.current() && !TLS._osthread._interrupted
     no_clear_result_path = 2, // t == Thread.current() &&  TLS._osthread._interrupted && !clear_int
     slow_result_path     = 3, // slow path: t.isInterrupted(clear_int)
     PATH_LIMIT
   };
   // Ensure that it's not possible to move the load of TLS._osthread._interrupted flag
   // out of the function.
   insert_mem_bar(Op_MemBarCPUOrder);
   RegionNode* result_rgn = new (C) RegionNode(PATH_LIMIT);
   PhiNode*    result_val = new (C) PhiNode(result_rgn, TypeInt::BOOL);
   RegionNode* slow_region = new (C) RegionNode(1);
   record_for_igvn(slow_region);
   // (a) Receiving thread must be the current thread.
   Node* rec_thr = argument(0);
   Node* tls_ptr = NULL;
   Node* cur_thr = generate_current_thread(tls_ptr);
   Node* cmp_thr = _gvn.transform(new (C) CmpPNode(cur_thr, rec_thr));
   Node* bol_thr = _gvn.transform(new (C) BoolNode(cmp_thr, BoolTest::ne));
   generate_slow_guard(bol_thr, slow_region);
   // (b) Interrupt bit on TLS must be false.
   Node* p = basic_plus_adr(top()/*!oop*/, tls_ptr, in_bytes(JavaThread::osthread_offset()));
   Node* osthread = make_load(NULL, p, TypeRawPtr::NOTNULL, T_ADDRESS, MemNode::unordered);
   p = basic_plus_adr(top()/*!oop*/, osthread, in_bytes(OSThread::interrupted_offset()));
   // Set the control input on the field _interrupted read to prevent it floating up.
   Node* int_bit = make_load(control(), p, TypeInt::BOOL, T_INT, MemNode::unordered);
   Node* cmp_bit = _gvn.transform(new (C) CmpINode(int_bit, intcon(0)));
   Node* bol_bit = _gvn.transform(new (C) BoolNode(cmp_bit, BoolTest::ne));
   IfNode* iff_bit = create_and_map_if(control(), bol_bit, PROB_UNLIKELY_MAG(3), COUNT_UNKNOWN);
   // First fast path:  if (!TLS._interrupted) return false;
   Node* false_bit = _gvn.transform(new (C) IfFalseNode(iff_bit));
   result_rgn->init_req(no_int_result_path, false_bit);
   result_val->init_req(no_int_result_path, intcon(0));
   // drop through to next case
   set_control( _gvn.transform(new (C) IfTrueNode(iff_bit)));
 #ifndef TARGET_OS_FAMILY_windows
   // (c) Or, if interrupt bit is set and clear_int is false, use 2nd fast path.
   Node* clr_arg = argument(1);
   Node* cmp_arg = _gvn.transform(new (C) CmpINode(clr_arg, intcon(0)));
   Node* bol_arg = _gvn.transform(new (C) BoolNode(cmp_arg, BoolTest::ne));
   IfNode* iff_arg = create_and_map_if(control(), bol_arg, PROB_FAIR, COUNT_UNKNOWN);
   // Second fast path:  ... else if (!clear_int) return true;
   Node* false_arg = _gvn.transform(new (C) IfFalseNode(iff_arg));
   result_rgn->init_req(no_clear_result_path, false_arg);
   result_val->init_req(no_clear_result_path, intcon(1));
   // drop through to next case
   set_control( _gvn.transform(new (C) IfTrueNode(iff_arg)));
 #else
   // To return true on Windows you must read the _interrupted field
   // and check the the event state i.e. take the slow path.
 #endif // TARGET_OS_FAMILY_windows
   // (d) Otherwise, go to the slow path.
   slow_region->add_req(control());
   set_control( _gvn.transform(slow_region));
   if (stopped()) {
     // There is no slow path.
     result_rgn->init_req(slow_result_path, top());
     result_val->init_req(slow_result_path, top());
   } else {
     // non-virtual because it is a private non-static
     CallJavaNode* slow_call = generate_method_call(vmIntrinsics::_isInterrupted);
     Node* slow_val = set_results_for_java_call(slow_call);
     // this->control() comes from set_results_for_java_call
     Node* fast_io  = slow_call->in(TypeFunc::I_O);
     Node* fast_mem = slow_call->in(TypeFunc::Memory);
     // These two phis are pre-filled with copies of of the fast IO and Memory
     PhiNode* result_mem  = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM);
     PhiNode* result_io   = PhiNode::make(result_rgn, fast_io,  Type::ABIO);
     result_rgn->init_req(slow_result_path, control());
     result_io ->init_req(slow_result_path, i_o());
     result_mem->init_req(slow_result_path, reset_memory());
     result_val->init_req(slow_result_path, slow_val);
     set_all_memory(_gvn.transform(result_mem));
     set_i_o(       _gvn.transform(result_io));
   }
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   set_result(result_rgn, result_val);
   return true;
 }
 //---------------------------load_mirror_from_klass----------------------------
 // Given a klass oop, load its java mirror (a java.lang.Class oop).
 Node* LibraryCallKit::load_mirror_from_klass(Node* klass) {
   Node* p = basic_plus_adr(klass, in_bytes(Klass::java_mirror_offset()));
   return make_load(NULL, p, TypeInstPtr::MIRROR, T_OBJECT, MemNode::unordered);
 }
 //-----------------------load_klass_from_mirror_common-------------------------
 // Given a java mirror (a java.lang.Class oop), load its corresponding klass oop.
 // Test the klass oop for null (signifying a primitive Class like Integer.TYPE),
 // and branch to the given path on the region.
 // If never_see_null, take an uncommon trap on null, so we can optimistically
 // compile for the non-null case.
 // If the region is NULL, force never_see_null = true.
 Node* LibraryCallKit::load_klass_from_mirror_common(Node* mirror,
                                                     bool never_see_null,
                                                     RegionNode* region,
                                                     int null_path,
                                                     int offset) {
   if (region == NULL)  never_see_null = true;
   Node* p = basic_plus_adr(mirror, offset);
   const TypeKlassPtr*  kls_type = TypeKlassPtr::OBJECT_OR_NULL;
   Node* kls = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeRawPtr::BOTTOM, kls_type));
   Node* null_ctl = top();
   kls = null_check_oop(kls, &null_ctl, never_see_null);
   if (region != NULL) {
     // Set region->in(null_path) if the mirror is a primitive (e.g, int.class).
     region->init_req(null_path, null_ctl);
   } else {
     assert(null_ctl == top(), "no loose ends");
   }
   return kls;
 }
 //--------------------(inline_native_Class_query helpers)---------------------
 // Use this for JVM_ACC_INTERFACE, JVM_ACC_IS_CLONEABLE, JVM_ACC_HAS_FINALIZER.
 // Fall through if (mods & mask) == bits, take the guard otherwise.
 Node* LibraryCallKit::generate_access_flags_guard(Node* kls, int modifier_mask, int modifier_bits, RegionNode* region) {
   // Branch around if the given klass has the given modifier bit set.
   // Like generate_guard, adds a new path onto the region.
   Node* modp = basic_plus_adr(kls, in_bytes(Klass::access_flags_offset()));
   Node* mods = make_load(NULL, modp, TypeInt::INT, T_INT, MemNode::unordered);
   Node* mask = intcon(modifier_mask);
   Node* bits = intcon(modifier_bits);
   Node* mbit = _gvn.transform(new (C) AndINode(mods, mask));
   Node* cmp  = _gvn.transform(new (C) CmpINode(mbit, bits));
   Node* bol  = _gvn.transform(new (C) BoolNode(cmp, BoolTest::ne));
   return generate_fair_guard(bol, region);
 }
 Node* LibraryCallKit::generate_interface_guard(Node* kls, RegionNode* region) {
   return generate_access_flags_guard(kls, JVM_ACC_INTERFACE, 0, region);
 }
 //-------------------------inline_native_Class_query-------------------
 bool LibraryCallKit::inline_native_Class_query(vmIntrinsics::ID id) {
   const Type* return_type = TypeInt::BOOL;
   Node* prim_return_value = top();  // what happens if it's a primitive class?
   bool never_see_null = !too_many_traps(Deoptimization::Reason_null_check);
   bool expect_prim = false;     // most of these guys expect to work on refs
   enum { _normal_path = 1, _prim_path = 2, PATH_LIMIT };
   Node* mirror = argument(0);
   Node* obj    = top();
   switch (id) {
   case vmIntrinsics::_isInstance:
     // nothing is an instance of a primitive type
     prim_return_value = intcon(0);
     obj = argument(1);
     break;
   case vmIntrinsics::_getModifiers:
     prim_return_value = intcon(JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
     assert(is_power_of_2((int)JVM_ACC_WRITTEN_FLAGS+1), "change next line");
     return_type = TypeInt::make(0, JVM_ACC_WRITTEN_FLAGS, Type::WidenMin);
     break;
   case vmIntrinsics::_isInterface:
     prim_return_value = intcon(0);
     break;
   case vmIntrinsics::_isArray:
     prim_return_value = intcon(0);
     expect_prim = true;  // cf. ObjectStreamClass.getClassSignature
     break;
   case vmIntrinsics::_isPrimitive:
     prim_return_value = intcon(1);
     expect_prim = true;  // obviously
     break;
   case vmIntrinsics::_getSuperclass:
     prim_return_value = null();
     return_type = TypeInstPtr::MIRROR->cast_to_ptr_type(TypePtr::BotPTR);
     break;
   case vmIntrinsics::_getComponentType:
     prim_return_value = null();
     return_type = TypeInstPtr::MIRROR->cast_to_ptr_type(TypePtr::BotPTR);
     break;
   case vmIntrinsics::_getClassAccessFlags:
     prim_return_value = intcon(JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
     return_type = TypeInt::INT;  // not bool!  6297094
     break;
   default:
     fatal_unexpected_iid(id);
     break;
   }
   const TypeInstPtr* mirror_con = _gvn.type(mirror)->isa_instptr();
   if (mirror_con == NULL)  return false;  // cannot happen?
 #ifndef PRODUCT
   if (C->print_intrinsics() || C->print_inlining()) {
     ciType* k = mirror_con->java_mirror_type();
     if (k) {
       tty->print("Inlining %s on constant Class ", vmIntrinsics::name_at(intrinsic_id()));
       k->print_name();
       tty->cr();
     }
   }
 #endif
   // Null-check the mirror, and the mirror's klass ptr (in case it is a primitive).
   RegionNode* region = new (C) RegionNode(PATH_LIMIT);
   record_for_igvn(region);
   PhiNode* phi = new (C) PhiNode(region, return_type);
   // The mirror will never be null of Reflection.getClassAccessFlags, however
   // it may be null for Class.isInstance or Class.getModifiers. Throw a NPE
   // if it is. See bug 4774291.
   // For Reflection.getClassAccessFlags(), the null check occurs in
   // the wrong place; see inline_unsafe_access(), above, for a similar
   // situation.
   mirror = null_check(mirror);
   // If mirror or obj is dead, only null-path is taken.
   if (stopped())  return true;
   if (expect_prim)  never_see_null = false;  // expect nulls (meaning prims)
   // Now load the mirror's klass metaobject, and null-check it.
   // Side-effects region with the control path if the klass is null.
   Node* kls = load_klass_from_mirror(mirror, never_see_null, region, _prim_path);
   // If kls is null, we have a primitive mirror.
   phi->init_req(_prim_path, prim_return_value);
   if (stopped()) { set_result(region, phi); return true; }
   bool safe_for_replace = (region->in(_prim_path) == top());
   Node* p;  // handy temp
   Node* null_ctl;
   // Now that we have the non-null klass, we can perform the real query.
   // For constant classes, the query will constant-fold in LoadNode::Value.
   Node* query_value = top();
   switch (id) {
   case vmIntrinsics::_isInstance:
     // nothing is an instance of a primitive type
     query_value = gen_instanceof(obj, kls, safe_for_replace);
     break;
   case vmIntrinsics::_getModifiers:
     p = basic_plus_adr(kls, in_bytes(Klass::modifier_flags_offset()));
     query_value = make_load(NULL, p, TypeInt::INT, T_INT, MemNode::unordered);
     break;
   case vmIntrinsics::_isInterface:
     // (To verify this code sequence, check the asserts in JVM_IsInterface.)
     if (generate_interface_guard(kls, region) != NULL)
       // A guard was added.  If the guard is taken, it was an interface.
       phi->add_req(intcon(1));
     // If we fall through, it's a plain class.
     query_value = intcon(0);
     break;
   case vmIntrinsics::_isArray:
     // (To verify this code sequence, check the asserts in JVM_IsArrayClass.)
     if (generate_array_guard(kls, region) != NULL)
       // A guard was added.  If the guard is taken, it was an array.
       phi->add_req(intcon(1));
     // If we fall through, it's a plain class.
     query_value = intcon(0);
     break;
   case vmIntrinsics::_isPrimitive:
     query_value = intcon(0); // "normal" path produces false
     break;
   case vmIntrinsics::_getSuperclass:
     // The rules here are somewhat unfortunate, but we can still do better
     // with random logic than with a JNI call.
     // Interfaces store null or Object as _super, but must report null.
     // Arrays store an intermediate super as _super, but must report Object.
     // Other types can report the actual _super.
     // (To verify this code sequence, check the asserts in JVM_IsInterface.)
     if (generate_interface_guard(kls, region) != NULL)
       // A guard was added.  If the guard is taken, it was an interface.
       phi->add_req(null());
     if (generate_array_guard(kls, region) != NULL)
       // A guard was added.  If the guard is taken, it was an array.
       phi->add_req(makecon(TypeInstPtr::make(env()->Object_klass()->java_mirror())));
     // If we fall through, it's a plain class.  Get its _super.
     p = basic_plus_adr(kls, in_bytes(Klass::super_offset()));
     kls = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeRawPtr::BOTTOM, TypeKlassPtr::OBJECT_OR_NULL));
     null_ctl = top();
     kls = null_check_oop(kls, &null_ctl);
     if (null_ctl != top()) {
       // If the guard is taken, Object.superClass is null (both klass and mirror).
       region->add_req(null_ctl);
       phi   ->add_req(null());
     }
     if (!stopped()) {
       query_value = load_mirror_from_klass(kls);
     }
     break;
   case vmIntrinsics::_getComponentType:
     if (generate_array_guard(kls, region) != NULL) {
       // Be sure to pin the oop load to the guard edge just created:
       Node* is_array_ctrl = region->in(region->req()-1);
       Node* cma = basic_plus_adr(kls, in_bytes(ArrayKlass::component_mirror_offset()));
       Node* cmo = make_load(is_array_ctrl, cma, TypeInstPtr::MIRROR, T_OBJECT, MemNode::unordered);
       phi->add_req(cmo);
     }
     query_value = null();  // non-array case is null
     break;
   case vmIntrinsics::_getClassAccessFlags:
     p = basic_plus_adr(kls, in_bytes(Klass::access_flags_offset()));
     query_value = make_load(NULL, p, TypeInt::INT, T_INT, MemNode::unordered);
     break;
   default:
     fatal_unexpected_iid(id);
     break;
   }
   // Fall-through is the normal case of a query to a real class.
   phi->init_req(1, query_value);
   region->init_req(1, control());
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   set_result(region, phi);
   return true;
 }
 //--------------------------inline_native_subtype_check------------------------
 // This intrinsic takes the JNI calls out of the heart of
 // UnsafeFieldAccessorImpl.set, which improves Field.set, readObject, etc.
 bool LibraryCallKit::inline_native_subtype_check() {
   // Pull both arguments off the stack.
   Node* args[2];                // two java.lang.Class mirrors: superc, subc
   args[0] = argument(0);
   args[1] = argument(1);
   Node* klasses[2];             // corresponding Klasses: superk, subk
   klasses[0] = klasses[1] = top();
   enum {
     // A full decision tree on {superc is prim, subc is prim}:
     _prim_0_path = 1,           // {P,N} => false
                                 // {P,P} & superc!=subc => false
     _prim_same_path,            // {P,P} & superc==subc => true
     _prim_1_path,               // {N,P} => false
     _ref_subtype_path,          // {N,N} & subtype check wins => true
     _both_ref_path,             // {N,N} & subtype check loses => false
     PATH_LIMIT
   };
   RegionNode* region = new (C) RegionNode(PATH_LIMIT);
   Node*       phi    = new (C) PhiNode(region, TypeInt::BOOL);
   record_for_igvn(region);
   const TypePtr* adr_type = TypeRawPtr::BOTTOM;   // memory type of loads
   const TypeKlassPtr* kls_type = TypeKlassPtr::OBJECT_OR_NULL;
   int class_klass_offset = java_lang_Class::klass_offset_in_bytes();
   // First null-check both mirrors and load each mirror's klass metaobject.
   int which_arg;
   for (which_arg = 0; which_arg <= 1; which_arg++) {
     Node* arg = args[which_arg];
     arg = null_check(arg);
     if (stopped())  break;
     args[which_arg] = arg;
     Node* p = basic_plus_adr(arg, class_klass_offset);
     Node* kls = LoadKlassNode::make(_gvn, immutable_memory(), p, adr_type, kls_type);
     klasses[which_arg] = _gvn.transform(kls);
   }
   // Having loaded both klasses, test each for null.
   bool never_see_null = !too_many_traps(Deoptimization::Reason_null_check);
   for (which_arg = 0; which_arg <= 1; which_arg++) {
     Node* kls = klasses[which_arg];
     Node* null_ctl = top();
     kls = null_check_oop(kls, &null_ctl, never_see_null);
     int prim_path = (which_arg == 0 ? _prim_0_path : _prim_1_path);
     region->init_req(prim_path, null_ctl);
     if (stopped())  break;
     klasses[which_arg] = kls;
   }
   if (!stopped()) {
     // now we have two reference types, in klasses[0..1]
     Node* subk   = klasses[1];  // the argument to isAssignableFrom
     Node* superk = klasses[0];  // the receiver
     region->set_req(_both_ref_path, gen_subtype_check(subk, superk));
     // now we have a successful reference subtype check
     region->set_req(_ref_subtype_path, control());
   }
   // If both operands are primitive (both klasses null), then
   // we must return true when they are identical primitives.
   // It is convenient to test this after the first null klass check.
   set_control(region->in(_prim_0_path)); // go back to first null check
   if (!stopped()) {
     // Since superc is primitive, make a guard for the superc==subc case.
     Node* cmp_eq = _gvn.transform(new (C) CmpPNode(args[0], args[1]));
     Node* bol_eq = _gvn.transform(new (C) BoolNode(cmp_eq, BoolTest::eq));
     generate_guard(bol_eq, region, PROB_FAIR);
     if (region->req() == PATH_LIMIT+1) {
       // A guard was added.  If the added guard is taken, superc==subc.
       region->swap_edges(PATH_LIMIT, _prim_same_path);
       region->del_req(PATH_LIMIT);
     }
     region->set_req(_prim_0_path, control()); // Not equal after all.
   }
   // these are the only paths that produce 'true':
   phi->set_req(_prim_same_path,   intcon(1));
   phi->set_req(_ref_subtype_path, intcon(1));
   // pull together the cases:
   assert(region->req() == PATH_LIMIT, "sane region");
   for (uint i = 1; i < region->req(); i++) {
     Node* ctl = region->in(i);
     if (ctl == NULL || ctl == top()) {
       region->set_req(i, top());
       phi   ->set_req(i, top());
     } else if (phi->in(i) == NULL) {
       phi->set_req(i, intcon(0)); // all other paths produce 'false'
     }
   }
   set_control(_gvn.transform(region));
   set_result(_gvn.transform(phi));
   return true;
 }
 //---------------------generate_array_guard_common------------------------
 Node* LibraryCallKit::generate_array_guard_common(Node* kls, RegionNode* region,
                                                   bool obj_array, bool not_array) {
   // If obj_array/non_array==false/false:
   // Branch around if the given klass is in fact an array (either obj or prim).
   // If obj_array/non_array==false/true:
   // Branch around if the given klass is not an array klass of any kind.
   // If obj_array/non_array==true/true:
   // Branch around if the kls is not an oop array (kls is int[], String, etc.)
   // If obj_array/non_array==true/false:
   // Branch around if the kls is an oop array (Object[] or subtype)
   //
   // Like generate_guard, adds a new path onto the region.
   jint  layout_con = 0;
   Node* layout_val = get_layout_helper(kls, layout_con);
   if (layout_val == NULL) {
     bool query = (obj_array
                   ? Klass::layout_helper_is_objArray(layout_con)
                   : Klass::layout_helper_is_array(layout_con));
     if (query == not_array) {
       return NULL;                       // never a branch
     } else {                             // always a branch
       Node* always_branch = control();
       if (region != NULL)
         region->add_req(always_branch);
       set_control(top());
       return always_branch;
     }
   }
   // Now test the correct condition.
   jint  nval = (obj_array
                 ? ((jint)Klass::_lh_array_tag_type_value
                    <<    Klass::_lh_array_tag_shift)
                 : Klass::_lh_neutral_value);
   Node* cmp = _gvn.transform(new(C) CmpINode(layout_val, intcon(nval)));
   BoolTest::mask btest = BoolTest::lt;  // correct for testing is_[obj]array
   // invert the test if we are looking for a non-array
   if (not_array)  btest = BoolTest(btest).negate();
   Node* bol = _gvn.transform(new(C) BoolNode(cmp, btest));
   return generate_fair_guard(bol, region);
 }
 //-----------------------inline_native_newArray--------------------------
 // private static native Object java.lang.reflect.newArray(Class<?> componentType, int length);
 bool LibraryCallKit::inline_native_newArray() {
   Node* mirror    = argument(0);
   Node* count_val = argument(1);
   mirror = null_check(mirror);
   // If mirror or obj is dead, only null-path is taken.
   if (stopped())  return true;
   enum { _normal_path = 1, _slow_path = 2, PATH_LIMIT };
   RegionNode* result_reg = new(C) RegionNode(PATH_LIMIT);
   PhiNode*    result_val = new(C) PhiNode(result_reg,
                                           TypeInstPtr::NOTNULL);
   PhiNode*    result_io  = new(C) PhiNode(result_reg, Type::ABIO);
   PhiNode*    result_mem = new(C) PhiNode(result_reg, Type::MEMORY,
                                           TypePtr::BOTTOM);
   bool never_see_null = !too_many_traps(Deoptimization::Reason_null_check);
   Node* klass_node = load_array_klass_from_mirror(mirror, never_see_null,
                                                   result_reg, _slow_path);
   Node* normal_ctl   = control();
   Node* no_array_ctl = result_reg->in(_slow_path);
   // Generate code for the slow case.  We make a call to newArray().
   set_control(no_array_ctl);
   if (!stopped()) {
     // Either the input type is void.class, or else the
     // array klass has not yet been cached.  Either the
     // ensuing call will throw an exception, or else it
     // will cache the array klass for next time.
     PreserveJVMState pjvms(this);
     CallJavaNode* slow_call = generate_method_call_static(vmIntrinsics::_newArray);
     Node* slow_result = set_results_for_java_call(slow_call);
     // this->control() comes from set_results_for_java_call
     result_reg->set_req(_slow_path, control());
     result_val->set_req(_slow_path, slow_result);
     result_io ->set_req(_slow_path, i_o());
     result_mem->set_req(_slow_path, reset_memory());
   }
   set_control(normal_ctl);
   if (!stopped()) {
     // Normal case:  The array type has been cached in the java.lang.Class.
     // The following call works fine even if the array type is polymorphic.
     // It could be a dynamic mix of int[], boolean[], Object[], etc.
     Node* obj = new_array(klass_node, count_val, 0);  // no arguments to push
     result_reg->init_req(_normal_path, control());
     result_val->init_req(_normal_path, obj);
     result_io ->init_req(_normal_path, i_o());
     result_mem->init_req(_normal_path, reset_memory());
   }
   // Return the combined state.
   set_i_o(        _gvn.transform(result_io)  );
   set_all_memory( _gvn.transform(result_mem));
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   set_result(result_reg, result_val);
   return true;
 }
 //----------------------inline_native_getLength--------------------------
 // public static native int java.lang.reflect.Array.getLength(Object array);
 bool LibraryCallKit::inline_native_getLength() {
   if (too_many_traps(Deoptimization::Reason_intrinsic))  return false;
   Node* array = null_check(argument(0));
   // If array is dead, only null-path is taken.
   if (stopped())  return true;
   // Deoptimize if it is a non-array.
   Node* non_array = generate_non_array_guard(load_object_klass(array), NULL);
   if (non_array != NULL) {
     PreserveJVMState pjvms(this);
     set_control(non_array);
     uncommon_trap(Deoptimization::Reason_intrinsic,
                   Deoptimization::Action_maybe_recompile);
   }
   // If control is dead, only non-array-path is taken.
   if (stopped())  return true;
   // The works fine even if the array type is polymorphic.
   // It could be a dynamic mix of int[], boolean[], Object[], etc.
   Node* result = load_array_length(array);
   C->set_has_split_ifs(true);  // Has chance for split-if optimization
   set_result(result);
   return true;
 }
 //------------------------inline_array_copyOf----------------------------
 // public static <T,U> T[] java.util.Arrays.copyOf(     U[] original, int newLength,         Class<? extends T[]> newType);
 // public static <T,U> T[] java.util.Arrays.copyOfRange(U[] original, int from,      int to, Class<? extends T[]> newType);
 bool LibraryCallKit::inline_array_copyOf(bool is_copyOfRange) {
   if (too_many_traps(Deoptimization::Reason_intrinsic))  return false;
   // Get the arguments.
   Node* original          = argument(0);
   Node* start             = is_copyOfRange? argument(1): intcon(0);
   Node* end               = is_copyOfRange? argument(2): argument(1);
   Node* array_type_mirror = is_copyOfRange? argument(3): argument(2);
   Node* newcopy;
   // Set the original stack and the reexecute bit for the interpreter to reexecute
   // the bytecode that invokes Arrays.copyOf if deoptimization happens.
   { PreserveReexecuteState preexecs(this);
     jvms()->set_should_reexecute(true);
     array_type_mirror = null_check(array_type_mirror);
     original          = null_check(original);
     // Check if a null path was taken unconditionally.
     if (stopped())  return true;
     Node* orig_length = load_array_length(original);
     Node* klass_node = load_klass_from_mirror(array_type_mirror, false, NULL, 0);
     klass_node = null_check(klass_node);
     RegionNode* bailout = new (C) RegionNode(1);
     record_for_igvn(bailout);
     // Despite the generic type of Arrays.copyOf, the mirror might be int, int[], etc.
     // Bail out if that is so.
     Node* not_objArray = generate_non_objArray_guard(klass_node, bailout);
     if (not_objArray != NULL) {
       // Improve the klass node's type from the new optimistic assumption:
       ciKlass* ak = ciArrayKlass::make(env()->Object_klass());
       const Type* akls = TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/);
       Node* cast = new (C) CastPPNode(klass_node, akls);
       cast->init_req(0, control());
       klass_node = _gvn.transform(cast);
     }
     // Bail out if either start or end is negative.
     generate_negative_guard(start, bailout, &start);
     generate_negative_guard(end,   bailout, &end);
     Node* length = end;
     if (_gvn.type(start) != TypeInt::ZERO) {
       length = _gvn.transform(new (C) SubINode(end, start));
     }
     // Bail out if length is negative.
     // Without this the new_array would throw
     // NegativeArraySizeException but IllegalArgumentException is what
     // should be thrown
     generate_negative_guard(length, bailout, &length);
     if (bailout->req() > 1) {
       PreserveJVMState pjvms(this);
       set_control(_gvn.transform(bailout));
       uncommon_trap(Deoptimization::Reason_intrinsic,
                     Deoptimization::Action_maybe_recompile);
     }
     if (!stopped()) {
       // How many elements will we copy from the original?
       // The answer is MinI(orig_length - start, length).
       Node* orig_tail = _gvn.transform(new (C) SubINode(orig_length, start));
       Node* moved = generate_min_max(vmIntrinsics::_min, orig_tail, length);
       newcopy = new_array(klass_node, length, 0);  // no argments to push
       // Generate a direct call to the right arraycopy function(s).
       // We know the copy is disjoint but we might not know if the
       // oop stores need checking.
       // Extreme case:  Arrays.copyOf((Integer[])x, 10, String[].class).
       // This will fail a store-check if x contains any non-nulls.
       bool disjoint_bases = true;
       // if start > orig_length then the length of the copy may be
       // negative.
       bool length_never_negative = !is_copyOfRange;
       generate_arraycopy(TypeAryPtr::OOPS, T_OBJECT,
                          original, start, newcopy, intcon(0), moved,
                          disjoint_bases, length_never_negative);
     }
   } // original reexecute is set back here
   C->set_has_split_ifs(true); // Has chance for split-if optimization
   if (!stopped()) {
     set_result(newcopy);
   }
   return true;
 }
 //----------------------generate_virtual_guard---------------------------
 // Helper for hashCode and clone.  Peeks inside the vtable to avoid a call.
 Node* LibraryCallKit::generate_virtual_guard(Node* obj_klass,
                                              RegionNode* slow_region) {
   ciMethod* method = callee();
   int vtable_index = method->vtable_index();
   assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index,
          err_msg_res("bad index %d", vtable_index));
   // Get the Method* out of the appropriate vtable entry.
   int entry_offset  = (InstanceKlass::vtable_start_offset() +
                      vtable_index*vtableEntry::size()) * wordSize +
                      vtableEntry::method_offset_in_bytes();
   Node* entry_addr  = basic_plus_adr(obj_klass, entry_offset);
   Node* target_call = make_load(NULL, entry_addr, TypePtr::NOTNULL, T_ADDRESS, MemNode::unordered);
   // Compare the target method with the expected method (e.g., Object.hashCode).
   const TypePtr* native_call_addr = TypeMetadataPtr::make(method);
   Node* native_call = makecon(native_call_addr);
   Node* chk_native  = _gvn.transform(new(C) CmpPNode(target_call, native_call));
   Node* test_native = _gvn.transform(new(C) BoolNode(chk_native, BoolTest::ne));
   return generate_slow_guard(test_native, slow_region);
 }
 //-----------------------generate_method_call----------------------------
 // Use generate_method_call to make a slow-call to the real
 // method if the fast path fails.  An alternative would be to
 // use a stub like OptoRuntime::slow_arraycopy_Java.
 // This only works for expanding the current library call,
 // not another intrinsic.  (E.g., don't use this for making an
 // arraycopy call inside of the copyOf intrinsic.)
 CallJavaNode*
 LibraryCallKit::generate_method_call(vmIntrinsics::ID method_id, bool is_virtual, bool is_static) {
   // When compiling the intrinsic method itself, do not use this technique.
   guarantee(callee() != C->method(), "cannot make slow-call to self");
   ciMethod* method = callee();
   // ensure the JVMS we have will be correct for this call
   guarantee(method_id == method->intrinsic_id(), "must match");
   const TypeFunc* tf = TypeFunc::make(method);
   CallJavaNode* slow_call;
   if (is_static) {
     assert(!is_virtual, "");
     slow_call = new(C) CallStaticJavaNode(C, tf,
                            SharedRuntime::get_resolve_static_call_stub(),
                            method, bci());
   } else if (is_virtual) {
     null_check_receiver();
     int vtable_index = Method::invalid_vtable_index;
     if (UseInlineCaches) {
       // Suppress the vtable call
     } else {
       // hashCode and clone are not a miranda methods,
       // so the vtable index is fixed.
       // No need to use the linkResolver to get it.
        vtable_index = method->vtable_index();
        assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index,
               err_msg_res("bad index %d", vtable_index));
     }
     slow_call = new(C) CallDynamicJavaNode(tf,
                           SharedRuntime::get_resolve_virtual_call_stub(),
                           method, vtable_index, bci());
   } else {  // neither virtual nor static:  opt_virtual
     null_check_receiver();
     slow_call = new(C) CallStaticJavaNode(C, tf,
                                 SharedRuntime::get_resolve_opt_virtual_call_stub(),
                                 method, bci());
     slow_call->set_optimized_virtual(true);
   }
   set_arguments_for_java_call(slow_call);
   set_edges_for_java_call(slow_call);
   return slow_call;
 }
 /**
  * Build special case code for calls to hashCode on an object. This call may
  * be virtual (invokevirtual) or bound (invokespecial). For each case we generate
  * slightly different code.
  */
 bool LibraryCallKit::inline_native_hashcode(bool is_virtual, bool is_static) {
   assert(is_static == callee()->is_static(), "correct intrinsic selection");
   assert(!(is_virtual && is_static), "either virtual, special, or static");
   enum { _slow_path = 1, _fast_path, _null_path, PATH_LIMIT };
   RegionNode* result_reg = new(C) RegionNode(PATH_LIMIT);
   PhiNode*    result_val = new(C) PhiNode(result_reg, TypeInt::INT);
   PhiNode*    result_io  = new(C) PhiNode(result_reg, Type::ABIO);
   PhiNode*    result_mem = new(C) PhiNode(result_reg, Type::MEMORY, TypePtr::BOTTOM);
   Node* obj = NULL;
   if (!is_static) {
     // Check for hashing null object
     obj = null_check_receiver();
     if (stopped())  return true;        // unconditionally null
     result_reg->init_req(_null_path, top());
     result_val->init_req(_null_path, top());
   } else {
     // Do a null check, and return zero if null.
     // System.identityHashCode(null) == 0
     obj = argument(0);
     Node* null_ctl = top();
     obj = null_check_oop(obj, &null_ctl);
     result_reg->init_req(_null_path, null_ctl);
     result_val->init_req(_null_path, _gvn.intcon(0));
   }
   // Unconditionally null?  Then return right away.
   if (stopped()) {
     set_control( result_reg->in(_null_path));
     if (!stopped())
       set_result(result_val->in(_null_path));
     return true;
   }
   // We only go to the fast case code if we pass a number of guards.  The
   // paths which do not pass are accumulated in the slow_region.
   RegionNode* slow_region = new (C) RegionNode(1);
   record_for_igvn(slow_region);
   // If this is a virtual call, we generate a funny guard.  We pull out
   // the vtable entry corresponding to hashCode() from the target object.
   // If the target method which we are calling happens to be the native
   // Object hashCode() method, we pass the guard.  We do not need this
   // guard for non-virtual calls -- the caller is known to be the native
   // Object hashCode().
   if (is_virtual) {
     // After null check, get the object's klass.
     Node* obj_klass = load_object_klass(obj);
     generate_virtual_guard(obj_klass, slow_region);
   }
   // Get the header out of the object, use LoadMarkNode when available
   Node* header_addr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
   // The control of the load must be NULL. Otherwise, the load can move before
   // the null check after castPP removal.
   Node* no_ctrl = NULL;
   Node* header = make_load(no_ctrl, header_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
   // Test the header to see if it is unlocked.
   Node* lock_mask      = _gvn.MakeConX(markOopDesc::biased_lock_mask_in_place);
   Node* lmasked_header = _gvn.transform(new (C) AndXNode(header, lock_mask));
   Node* unlocked_val   = _gvn.MakeConX(markOopDesc::unlocked_value);
   Node* chk_unlocked   = _gvn.transform(new (C) CmpXNode( lmasked_header, unlocked_val));
   Node* test_unlocked  = _gvn.transform(new (C) BoolNode( chk_unlocked, BoolTest::ne));
   generate_slow_guard(test_unlocked, slow_region);
   // Get the hash value and check to see that it has been properly assigned.
   // We depend on hash_mask being at most 32 bits and avoid the use of
   // hash_mask_in_place because it could be larger than 32 bits in a 64-bit
   // vm: see markOop.hpp.
   Node* hash_mask      = _gvn.intcon(markOopDesc::hash_mask);
   Node* hash_shift     = _gvn.intcon(markOopDesc::hash_shift);
   Node* hshifted_header= _gvn.transform(new (C) URShiftXNode(header, hash_shift));
   // This hack lets the hash bits live anywhere in the mark object now, as long
   // as the shift drops the relevant bits into the low 32 bits.  Note that
   // Java spec says that HashCode is an int so there's no point in capturing
   // an 'X'-sized hashcode (32 in 32-bit build or 64 in 64-bit build).
   hshifted_header      = ConvX2I(hshifted_header);
   Node* hash_val       = _gvn.transform(new (C) AndINode(hshifted_header, hash_mask));
   Node* no_hash_val    = _gvn.intcon(markOopDesc::no_hash);
   Node* chk_assigned   = _gvn.transform(new (C) CmpINode( hash_val, no_hash_val));
   Node* test_assigned  = _gvn.transform(new (C) BoolNode( chk_assigned, BoolTest::eq));
   generate_slow_guard(test_assigned, slow_region);
   Node* init_mem = reset_memory();
   // fill in the rest of the null path:
   result_io ->init_req(_null_path, i_o());
   result_mem->init_req(_null_path, init_mem);
   result_val->init_req(_fast_path, hash_val);
   result_reg->init_req(_fast_path, control());
   result_io ->init_req(_fast_path, i_o());
   result_mem->init_req(_fast_path, init_mem);
   // Generate code for the slow case.  We make a call to hashCode().
   set_control(_gvn.transform(slow_region));
   if (!stopped()) {
     // No need for PreserveJVMState, because we're using up the present state.
     set_all_memory(init_mem);
     vmIntrinsics::ID hashCode_id = is_static ? vmIntrinsics::_identityHashCode : vmIntrinsics::_hashCode;
     CallJavaNode* slow_call = generate_method_call(hashCode_id, is_virtual, is_static);
     Node* slow_result = set_results_for_java_call(slow_call);
     // this->control() comes from set_results_for_java_call
     result_reg->init_req(_slow_path, control());
     result_val->init_req(_slow_path, slow_result);
     result_io  ->set_req(_slow_path, i_o());
     result_mem ->set_req(_slow_path, reset_memory());
   }
   // Return the combined state.
   set_i_o(        _gvn.transform(result_io)  );
   set_all_memory( _gvn.transform(result_mem));
   set_result(result_reg, result_val);
   return true;
 }
 //---------------------------inline_native_getClass----------------------------
 // public final native Class<?> java.lang.Object.getClass();
 //
 // Build special case code for calls to getClass on an object.
 bool LibraryCallKit::inline_native_getClass() {
   Node* obj = null_check_receiver();
   if (stopped())  return true;
   set_result(load_mirror_from_klass(load_object_klass(obj)));
   return true;
 }
 //-----------------inline_native_Reflection_getCallerClass---------------------
 // public static native Class<?> sun.reflect.Reflection.getCallerClass();
 //
 // In the presence of deep enough inlining, getCallerClass() becomes a no-op.
 //
 // NOTE: This code must perform the same logic as JVM_GetCallerClass
 // in that it must skip particular security frames and checks for
 // caller sensitive methods.
 bool LibraryCallKit::inline_native_Reflection_getCallerClass() {
 #ifndef PRODUCT
   if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
     tty->print_cr("Attempting to inline sun.reflect.Reflection.getCallerClass");
   }
 #endif
   if (!jvms()->has_method()) {
 #ifndef PRODUCT
     if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
       tty->print_cr("  Bailing out because intrinsic was inlined at top level");
     }
 #endif
     return false;
   }
   // Walk back up the JVM state to find the caller at the required
   // depth.
   JVMState* caller_jvms = jvms();
   // Cf. JVM_GetCallerClass
   // NOTE: Start the loop at depth 1 because the current JVM state does
   // not include the Reflection.getCallerClass() frame.
   for (int n = 1; caller_jvms != NULL; caller_jvms = caller_jvms->caller(), n++) {
     ciMethod* m = caller_jvms->method();
     switch (n) {
     case 0:
       fatal("current JVM state does not include the Reflection.getCallerClass frame");
       break;
     case 1:
       // Frame 0 and 1 must be caller sensitive (see JVM_GetCallerClass).
       if (!m->caller_sensitive()) {
 #ifndef PRODUCT
         if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
           tty->print_cr("  Bailing out: CallerSensitive annotation expected at frame %d", n);
         }
 #endif
         return false;  // bail-out; let JVM_GetCallerClass do the work
       }
       break;
     default:
       if (!m->is_ignored_by_security_stack_walk()) {
         // We have reached the desired frame; return the holder class.
         // Acquire method holder as java.lang.Class and push as constant.
         ciInstanceKlass* caller_klass = caller_jvms->method()->holder();
         ciInstance* caller_mirror = caller_klass->java_mirror();
         set_result(makecon(TypeInstPtr::make(caller_mirror)));
 #ifndef PRODUCT
         if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
           tty->print_cr("  Succeeded: caller = %d) %s.%s, JVMS depth = %d", n, caller_klass->name()->as_utf8(), caller_jvms->method()->name()->as_utf8(), jvms()->depth());
           tty->print_cr("  JVM state at this point:");
           for (int i = jvms()->depth(), n = 1; i >= 1; i--, n++) {
             ciMethod* m = jvms()->of_depth(i)->method();
             tty->print_cr("   %d) %s.%s", n, m->holder()->name()->as_utf8(), m->name()->as_utf8());
           }
         }
 #endif
         return true;
       }
       break;
     }
   }
 #ifndef PRODUCT
   if ((C->print_intrinsics() || C->print_inlining()) && Verbose) {
     tty->print_cr("  Bailing out because caller depth exceeded inlining depth = %d", jvms()->depth());
     tty->print_cr("  JVM state at this point:");
     for (int i = jvms()->depth(), n = 1; i >= 1; i--, n++) {
       ciMethod* m = jvms()->of_depth(i)->method();
       tty->print_cr("   %d) %s.%s", n, m->holder()->name()->as_utf8(), m->name()->as_utf8());
     }
   }
 #endif
   return false;  // bail-out; let JVM_GetCallerClass do the work
 }
 bool LibraryCallKit::inline_fp_conversions(vmIntrinsics::ID id) {
   Node* arg = argument(0);
   Node* result;
   switch (id) {
   case vmIntrinsics::_floatToRawIntBits:    result = new (C) MoveF2INode(arg);  break;
   case vmIntrinsics::_intBitsToFloat:       result = new (C) MoveI2FNode(arg);  break;
   case vmIntrinsics::_doubleToRawLongBits:  result = new (C) MoveD2LNode(arg);  break;
   case vmIntrinsics::_longBitsToDouble:     result = new (C) MoveL2DNode(arg);  break;
   case vmIntrinsics::_doubleToLongBits: {
     // two paths (plus control) merge in a wood
     RegionNode *r = new (C) RegionNode(3);
     Node *phi = new (C) PhiNode(r, TypeLong::LONG);
     Node *cmpisnan = _gvn.transform(new (C) CmpDNode(arg, arg));
     // Build the boolean node
     Node *bolisnan = _gvn.transform(new (C) BoolNode(cmpisnan, BoolTest::ne));
     // Branch either way.
     // NaN case is less traveled, which makes all the difference.
     IfNode *ifisnan = create_and_xform_if(control(), bolisnan, PROB_STATIC_FREQUENT, COUNT_UNKNOWN);
     Node *opt_isnan = _gvn.transform(ifisnan);
     assert( opt_isnan->is_If(), "Expect an IfNode");
     IfNode *opt_ifisnan = (IfNode*)opt_isnan;
     Node *iftrue = _gvn.transform(new (C) IfTrueNode(opt_ifisnan));
     set_control(iftrue);
     static const jlong nan_bits = CONST64(0x7ff8000000000000);
     Node *slow_result = longcon(nan_bits); // return NaN
     phi->init_req(1, _gvn.transform( slow_result ));
     r->init_req(1, iftrue);
     // Else fall through
     Node *iffalse = _gvn.transform(new (C) IfFalseNode(opt_ifisnan));
     set_control(iffalse);
     phi->init_req(2, _gvn.transform(new (C) MoveD2LNode(arg)));
     r->init_req(2, iffalse);
     // Post merge
     set_control(_gvn.transform(r));
     record_for_igvn(r);
     C->set_has_split_ifs(true); // Has chance for split-if optimization
     result = phi;
     assert(result->bottom_type()->isa_long(), "must be");
     break;
   }
   case vmIntrinsics::_floatToIntBits: {
     // two paths (plus control) merge in a wood
     RegionNode *r = new (C) RegionNode(3);
     Node *phi = new (C) PhiNode(r, TypeInt::INT);
     Node *cmpisnan = _gvn.transform(new (C) CmpFNode(arg, arg));
     // Build the boolean node
     Node *bolisnan = _gvn.transform(new (C) BoolNode(cmpisnan, BoolTest::ne));
     // Branch either way.
     // NaN case is less traveled, which makes all the difference.
     IfNode *ifisnan = create_and_xform_if(control(), bolisnan, PROB_STATIC_FREQUENT, COUNT_UNKNOWN);
     Node *opt_isnan = _gvn.transform(ifisnan);
     assert( opt_isnan->is_If(), "Expect an IfNode");
     IfNode *opt_ifisnan = (IfNode*)opt_isnan;
     Node *iftrue = _gvn.transform(new (C) IfTrueNode(opt_ifisnan));
     set_control(iftrue);
     static const jint nan_bits = 0x7fc00000;
     Node *slow_result = makecon(TypeInt::make(nan_bits)); // return NaN
     phi->init_req(1, _gvn.transform( slow_result ));
     r->init_req(1, iftrue);
     // Else fall through
     Node *iffalse = _gvn.transform(new (C) IfFalseNode(opt_ifisnan));
     set_control(iffalse);
     phi->init_req(2, _gvn.transform(new (C) MoveF2INode(arg)));
     r->init_req(2, iffalse);
     // Post merge
     set_control(_gvn.transform(r));
     record_for_igvn(r);
     C->set_has_split_ifs(true); // Has chance for split-if optimization
     result = phi;
     assert(result->bottom_type()->isa_int(), "must be");
     break;
   }
   default:
     fatal_unexpected_iid(id);
     break;
   }
   set_result(_gvn.transform(result));
   return true;
 }
 #ifdef _LP64
 #define XTOP ,top() /*additional argument*/
 #else  //_LP64
 #define XTOP        /*no additional argument*/
 #endif //_LP64
 //----------------------inline_unsafe_copyMemory-------------------------
 // public native void sun.misc.Unsafe.copyMemory(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes);
 bool LibraryCallKit::inline_unsafe_copyMemory() {
   if (callee()->is_static())  return false;  // caller must have the capability!
   null_check_receiver();  // null-check receiver
   if (stopped())  return true;
   C->set_has_unsafe_access(true);  // Mark eventual nmethod as "unsafe".
   Node* src_ptr =         argument(1);   // type: oop
   Node* src_off = ConvL2X(argument(2));  // type: long
   Node* dst_ptr =         argument(4);   // type: oop
   Node* dst_off = ConvL2X(argument(5));  // type: long
   Node* size    = ConvL2X(argument(7));  // type: long
   assert(Unsafe_field_offset_to_byte_offset(11) == 11,
          "fieldOffset must be byte-scaled");
   Node* src = make_unsafe_address(src_ptr, src_off);
   Node* dst = make_unsafe_address(dst_ptr, dst_off);
   // Conservatively insert a memory barrier on all memory slices.
   // Do not let writes of the copy source or destination float below the copy.
   insert_mem_bar(Op_MemBarCPUOrder);
   // Call it.  Note that the length argument is not scaled.
   make_runtime_call(RC_LEAF|RC_NO_FP,
                     OptoRuntime::fast_arraycopy_Type(),
                     StubRoutines::unsafe_arraycopy(),
                     "unsafe_arraycopy",
                     TypeRawPtr::BOTTOM,
                     src, dst, size XTOP);
   // Do not let reads of the copy destination float above the copy.
   insert_mem_bar(Op_MemBarCPUOrder);
   return true;
 }
 //------------------------clone_coping-----------------------------------
 // Helper function for inline_native_clone.
 void LibraryCallKit::copy_to_clone(Node* obj, Node* alloc_obj, Node* obj_size, bool is_array, bool card_mark) {
   assert(obj_size != NULL, "");
   Node* raw_obj = alloc_obj->in(1);
   assert(alloc_obj->is_CheckCastPP() && raw_obj->is_Proj() && raw_obj->in(0)->is_Allocate(), "");
   AllocateNode* alloc = NULL;
   if (ReduceBulkZeroing) {
     // We will be completely responsible for initializing this object -
     // mark Initialize node as complete.
     alloc = AllocateNode::Ideal_allocation(alloc_obj, &_gvn);
     // The object was just allocated - there should be no any stores!
     guarantee(alloc != NULL && alloc->maybe_set_complete(&_gvn), "");
     // Mark as complete_with_arraycopy so that on AllocateNode
     // expansion, we know this AllocateNode is initialized by an array
     // copy and a StoreStore barrier exists after the array copy.
     alloc->initialization()->set_complete_with_arraycopy();
   }
   // Copy the fastest available way.
   // TODO: generate fields copies for small objects instead.
   Node* src  = obj;
   Node* dest = alloc_obj;
   Node* size = _gvn.transform(obj_size);
   // Exclude the header but include array length to copy by 8 bytes words.
   // Can't use base_offset_in_bytes(bt) since basic type is unknown.
   int base_off = is_array ? arrayOopDesc::length_offset_in_bytes() :
                             instanceOopDesc::base_offset_in_bytes();
   // base_off:
   // 8  - 32-bit VM
   // 12 - 64-bit VM, compressed klass
   // 16 - 64-bit VM, normal klass
   if (base_off % BytesPerLong != 0) {
     assert(UseCompressedClassPointers, "");
     if (is_array) {
       // Exclude length to copy by 8 bytes words.
       base_off += sizeof(int);
     } else {
       // Include klass to copy by 8 bytes words.
       base_off = instanceOopDesc::klass_offset_in_bytes();
     }
     assert(base_off % BytesPerLong == 0, "expect 8 bytes alignment");
   }
   src  = basic_plus_adr(src,  base_off);
   dest = basic_plus_adr(dest, base_off);
   // Compute the length also, if needed:
   Node* countx = size;
   countx = _gvn.transform(new (C) SubXNode(countx, MakeConX(base_off)));
   countx = _gvn.transform(new (C) URShiftXNode(countx, intcon(LogBytesPerLong) ));
   const TypePtr* raw_adr_type = TypeRawPtr::BOTTOM;
   bool disjoint_bases = true;
   generate_unchecked_arraycopy(raw_adr_type, T_LONG, disjoint_bases,
                                src, NULL, dest, NULL, countx,
                                /*dest_uninitialized*/true);
   // If necessary, emit some card marks afterwards.  (Non-arrays only.)
   if (card_mark) {
     assert(!is_array, "");
     // Put in store barrier for any and all oops we are sticking
     // into this object.  (We could avoid this if we could prove
     // that the object type contains no oop fields at all.)
     Node* no_particular_value = NULL;
     Node* no_particular_field = NULL;
     int raw_adr_idx = Compile::AliasIdxRaw;
     post_barrier(control(),
                  memory(raw_adr_type),
                  alloc_obj,
                  no_particular_field,
                  raw_adr_idx,
                  no_particular_value,
                  T_OBJECT,
                  false);
   }
   // Do not let reads from the cloned object float above the arraycopy.
   if (alloc != NULL) {
     // Do not let stores that initialize this object be reordered with
     // a subsequent store that would make this object accessible by
     // other threads.
     // Record what AllocateNode this StoreStore protects so that
     // escape analysis can go from the MemBarStoreStoreNode to the
     // AllocateNode and eliminate the MemBarStoreStoreNode if possible
     // based on the escape status of the AllocateNode.
     insert_mem_bar(Op_MemBarStoreStore, alloc->proj_out(AllocateNode::RawAddress));
   } else {
     insert_mem_bar(Op_MemBarCPUOrder);
   }
 }
 //------------------------inline_native_clone----------------------------
 // protected native Object java.lang.Object.clone();
 //
 // Here are the simple edge cases:
 //  null receiver => normal trap
 //  virtual and clone was overridden => slow path to out-of-line clone
 //  not cloneable or finalizer => slow path to out-of-line Object.clone
 //
 // The general case has two steps, allocation and copying.
 // Allocation has two cases, and uses GraphKit::new_instance or new_array.
 //
 // Copying also has two cases, oop arrays and everything else.
 // Oop arrays use arrayof_oop_arraycopy (same as System.arraycopy).
 // Everything else uses the tight inline loop supplied by CopyArrayNode.
 //
 // These steps fold up nicely if and when the cloned object's klass
 // can be sharply typed as an object array, a type array, or an instance.
 //
 bool LibraryCallKit::inline_native_clone(bool is_virtual) {
   PhiNode* result_val;
   // Set the reexecute bit for the interpreter to reexecute
   // the bytecode that invokes Object.clone if deoptimization happens.
   { PreserveReexecuteState preexecs(this);
     jvms()->set_should_reexecute(true);
     Node* obj = null_check_receiver();
     if (stopped())  return true;
     Node* obj_klass = load_object_klass(obj);
     const TypeKlassPtr* tklass = _gvn.type(obj_klass)->isa_klassptr();
     const TypeOopPtr*   toop   = ((tklass != NULL)
                                 ? tklass->as_instance_type()
                                 : TypeInstPtr::NOTNULL);
     // Conservatively insert a memory barrier on all memory slices.
     // Do not let writes into the original float below the clone.
     insert_mem_bar(Op_MemBarCPUOrder);
     // paths into result_reg:
     enum {
       _slow_path = 1,     // out-of-line call to clone method (virtual or not)
       _objArray_path,     // plain array allocation, plus arrayof_oop_arraycopy
       _array_path,        // plain array allocation, plus arrayof_long_arraycopy
       _instance_path,     // plain instance allocation, plus arrayof_long_arraycopy
       PATH_LIMIT
     };
     RegionNode* result_reg = new(C) RegionNode(PATH_LIMIT);
     result_val             = new(C) PhiNode(result_reg,
                                             TypeInstPtr::NOTNULL);
     PhiNode*    result_i_o = new(C) PhiNode(result_reg, Type::ABIO);
     PhiNode*    result_mem = new(C) PhiNode(result_reg, Type::MEMORY,
                                             TypePtr::BOTTOM);
     record_for_igvn(result_reg);
     const TypePtr* raw_adr_type = TypeRawPtr::BOTTOM;
     int raw_adr_idx = Compile::AliasIdxRaw;
     Node* array_ctl = generate_array_guard(obj_klass, (RegionNode*)NULL);
     if (array_ctl != NULL) {
       // It's an array.
       PreserveJVMState pjvms(this);
       set_control(array_ctl);
       Node* obj_length = load_array_length(obj);
       Node* obj_size  = NULL;
       Node* alloc_obj = new_array(obj_klass, obj_length, 0, &obj_size);  // no arguments to push
       if (!use_ReduceInitialCardMarks()) {
         // If it is an oop array, it requires very special treatment,
         // because card marking is required on each card of the array.
         Node* is_obja = generate_objArray_guard(obj_klass, (RegionNode*)NULL);
         if (is_obja != NULL) {
           PreserveJVMState pjvms2(this);
           set_control(is_obja);
           // Generate a direct call to the right arraycopy function(s).
           bool disjoint_bases = true;
           bool length_never_negative = true;
           generate_arraycopy(TypeAryPtr::OOPS, T_OBJECT,
                              obj, intcon(0), alloc_obj, intcon(0),
                              obj_length,
                              disjoint_bases, length_never_negative);
           result_reg->init_req(_objArray_path, control());
           result_val->init_req(_objArray_path, alloc_obj);
           result_i_o ->set_req(_objArray_path, i_o());
           result_mem ->set_req(_objArray_path, reset_memory());
         }
       }
       // Otherwise, there are no card marks to worry about.
       // (We can dispense with card marks if we know the allocation
       //  comes out of eden (TLAB)...  In fact, ReduceInitialCardMarks
       //  causes the non-eden paths to take compensating steps to
       //  simulate a fresh allocation, so that no further
       //  card marks are required in compiled code to initialize
       //  the object.)
       if (!stopped()) {
         copy_to_clone(obj, alloc_obj, obj_size, true, false);
         // Present the results of the copy.
         result_reg->init_req(_array_path, control());
         result_val->init_req(_array_path, alloc_obj);
         result_i_o ->set_req(_array_path, i_o());
         result_mem ->set_req(_array_path, reset_memory());
       }
     }
     // We only go to the instance fast case code if we pass a number of guards.
     // The paths which do not pass are accumulated in the slow_region.
     RegionNode* slow_region = new (C) RegionNode(1);
     record_for_igvn(slow_region);
     if (!stopped()) {
       // It's an instance (we did array above).  Make the slow-path tests.
       // If this is a virtual call, we generate a funny guard.  We grab
       // the vtable entry corresponding to clone() from the target object.
       // If the target method which we are calling happens to be the
       // Object clone() method, we pass the guard.  We do not need this
       // guard for non-virtual calls; the caller is known to be the native
       // Object clone().
       if (is_virtual) {
         generate_virtual_guard(obj_klass, slow_region);
       }
       // The object must be cloneable and must not have a finalizer.
       // Both of these conditions may be checked in a single test.
       // We could optimize the cloneable test further, but we don't care.
       generate_access_flags_guard(obj_klass,
                                   // Test both conditions:
                                   JVM_ACC_IS_CLONEABLE | JVM_ACC_HAS_FINALIZER,
                                   // Must be cloneable but not finalizer:
                                   JVM_ACC_IS_CLONEABLE,
                                   slow_region);
     }
     if (!stopped()) {
       // It's an instance, and it passed the slow-path tests.
       PreserveJVMState pjvms(this);
       Node* obj_size  = NULL;
       // Need to deoptimize on exception from allocation since Object.clone intrinsic
       // is reexecuted if deoptimization occurs and there could be problems when merging
       // exception state between multiple Object.clone versions (reexecute=true vs reexecute=false).
       Node* alloc_obj = new_instance(obj_klass, NULL, &obj_size, /*deoptimize_on_exception=*/true);
       copy_to_clone(obj, alloc_obj, obj_size, false, !use_ReduceInitialCardMarks());
       // Present the results of the slow call.
       result_reg->init_req(_instance_path, control());
       result_val->init_req(_instance_path, alloc_obj);
       result_i_o ->set_req(_instance_path, i_o());
       result_mem ->set_req(_instance_path, reset_memory());
     }
     // Generate code for the slow case.  We make a call to clone().
     set_control(_gvn.transform(slow_region));
     if (!stopped()) {
       PreserveJVMState pjvms(this);
       CallJavaNode* slow_call = generate_method_call(vmIntrinsics::_clone, is_virtual);
       Node* slow_result = set_results_for_java_call(slow_call);
       // this->control() comes from set_results_for_java_call
       result_reg->init_req(_slow_path, control());
       result_val->init_req(_slow_path, slow_result);
       result_i_o ->set_req(_slow_path, i_o());
       result_mem ->set_req(_slow_path, reset_memory());
     }
     // Return the combined state.
     set_control(    _gvn.transform(result_reg));
     set_i_o(        _gvn.transform(result_i_o));
     set_all_memory( _gvn.transform(result_mem));
   } // original reexecute is set back here
   set_result(_gvn.transform(result_val));
   return true;
 }
 //------------------------------basictype2arraycopy----------------------------
 address LibraryCallKit::basictype2arraycopy(BasicType t,
                                             Node* src_offset,
                                             Node* dest_offset,
                                             bool disjoint_bases,
                                             const char* &name,
                                             bool dest_uninitialized) {
   const TypeInt* src_offset_inttype  = gvn().find_int_type(src_offset);;
   const TypeInt* dest_offset_inttype = gvn().find_int_type(dest_offset);;
   bool aligned = false;
   bool disjoint = disjoint_bases;
   // if the offsets are the same, we can treat the memory regions as
   // disjoint, because either the memory regions are in different arrays,
   // or they are identical (which we can treat as disjoint.)  We can also
   // treat a copy with a destination index  less that the source index
   // as disjoint since a low->high copy will work correctly in this case.
   if (src_offset_inttype != NULL && src_offset_inttype->is_con() &&
       dest_offset_inttype != NULL && dest_offset_inttype->is_con()) {
     // both indices are constants
     int s_offs = src_offset_inttype->get_con();
     int d_offs = dest_offset_inttype->get_con();
     int element_size = type2aelembytes(t);
     aligned = ((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) &&
               ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0);
     if (s_offs >= d_offs)  disjoint = true;
   } else if (src_offset == dest_offset && src_offset != NULL) {
     // This can occur if the offsets are identical non-constants.
     disjoint = true;
   }
   return StubRoutines::select_arraycopy_function(t, aligned, disjoint, name, dest_uninitialized);
 }
 //------------------------------inline_arraycopy-----------------------
 // public static native void java.lang.System.arraycopy(Object src,  int  srcPos,
 //                                                      Object dest, int destPos,
 //                                                      int length);
 bool LibraryCallKit::inline_arraycopy() {
   // Get the arguments.
   Node* src         = argument(0);  // type: oop
   Node* src_offset  = argument(1);  // type: int
   Node* dest        = argument(2);  // type: oop
   Node* dest_offset = argument(3);  // type: int
   Node* length      = argument(4);  // type: int
   // Compile time checks.  If any of these checks cannot be verified at compile time,
   // we do not make a fast path for this call.  Instead, we let the call remain as it
   // is.  The checks we choose to mandate at compile time are:
   //
   // (1) src and dest are arrays.
   const Type* src_type  = src->Value(&_gvn);
   const Type* dest_type = dest->Value(&_gvn);
   const TypeAryPtr* top_src  = src_type->isa_aryptr();
   const TypeAryPtr* top_dest = dest_type->isa_aryptr();
   // Do we have the type of src?
   bool has_src = (top_src != NULL && top_src->klass() != NULL);
   // Do we have the type of dest?
   bool has_dest = (top_dest != NULL && top_dest->klass() != NULL);
   // Is the type for src from speculation?
   bool src_spec = false;
   // Is the type for dest from speculation?
   bool dest_spec = false;
   if (!has_src || !has_dest) {
     // We don't have sufficient type information, let's see if
     // speculative types can help. We need to have types for both src
     // and dest so that it pays off.
     // Do we already have or could we have type information for src
     bool could_have_src = has_src;
     // Do we already have or could we have type information for dest
     bool could_have_dest = has_dest;
     ciKlass* src_k = NULL;
     if (!has_src) {
       src_k = src_type->speculative_type();
       if (src_k != NULL && src_k->is_array_klass()) {
         could_have_src = true;
       }
     }
     ciKlass* dest_k = NULL;
     if (!has_dest) {
       dest_k = dest_type->speculative_type();
       if (dest_k != NULL && dest_k->is_array_klass()) {
         could_have_dest = true;
       }
     }
     if (could_have_src && could_have_dest) {
       // This is going to pay off so emit the required guards
       if (!has_src) {
         src = maybe_cast_profiled_obj(src, src_k);
         src_type  = _gvn.type(src);
         top_src  = src_type->isa_aryptr();
         has_src = (top_src != NULL && top_src->klass() != NULL);
         src_spec = true;
       }
       if (!has_dest) {
         dest = maybe_cast_profiled_obj(dest, dest_k);
         dest_type  = _gvn.type(dest);
         top_dest  = dest_type->isa_aryptr();
         has_dest = (top_dest != NULL && top_dest->klass() != NULL);
         dest_spec = true;
       }
     }
   }
   if (!has_src || !has_dest) {
     // Conservatively insert a memory barrier on all memory slices.
     // Do not let writes into the source float below the arraycopy.
     insert_mem_bar(Op_MemBarCPUOrder);
     // Call StubRoutines::generic_arraycopy stub.
     generate_arraycopy(TypeRawPtr::BOTTOM, T_CONFLICT,
                        src, src_offset, dest, dest_offset, length);
     // Do not let reads from the destination float above the arraycopy.
     // Since we cannot type the arrays, we don't know which slices
     // might be affected.  We could restrict this barrier only to those
     // memory slices which pertain to array elements--but don't bother.
     if (!InsertMemBarAfterArraycopy)
       // (If InsertMemBarAfterArraycopy, there is already one in place.)
       insert_mem_bar(Op_MemBarCPUOrder);
     return true;
   }
   // (2) src and dest arrays must have elements of the same BasicType
   // Figure out the size and type of the elements we will be copying.
   BasicType src_elem  =  top_src->klass()->as_array_klass()->element_type()->basic_type();
   BasicType dest_elem = top_dest->klass()->as_array_klass()->element_type()->basic_type();
   if (src_elem  == T_ARRAY)  src_elem  = T_OBJECT;
   if (dest_elem == T_ARRAY)  dest_elem = T_OBJECT;
   if (src_elem != dest_elem || dest_elem == T_VOID) {
     // The component types are not the same or are not recognized.  Punt.
     // (But, avoid the native method wrapper to JVM_ArrayCopy.)
     generate_slow_arraycopy(TypePtr::BOTTOM,
                             src, src_offset, dest, dest_offset, length,
                             /*dest_uninitialized*/false);
     return true;
   }
   if (src_elem == T_OBJECT) {
     // If both arrays are object arrays then having the exact types
     // for both will remove the need for a subtype check at runtime
     // before the call and may make it possible to pick a faster copy
     // routine (without a subtype check on every element)
     // Do we have the exact type of src?
     bool could_have_src = src_spec;
     // Do we have the exact type of dest?
     bool could_have_dest = dest_spec;
     ciKlass* src_k = top_src->klass();
     ciKlass* dest_k = top_dest->klass();
     if (!src_spec) {
       src_k = src_type->speculative_type();
       if (src_k != NULL && src_k->is_array_klass()) {
           could_have_src = true;
       }
     }
     if (!dest_spec) {
       dest_k = dest_type->speculative_type();
       if (dest_k != NULL && dest_k->is_array_klass()) {
         could_have_dest = true;
       }
     }
     if (could_have_src && could_have_dest) {
       // If we can have both exact types, emit the missing guards
       if (could_have_src && !src_spec) {
         src = maybe_cast_profiled_obj(src, src_k);
       }
       if (could_have_dest && !dest_spec) {
         dest = maybe_cast_profiled_obj(dest, dest_k);
       }
     }
   }
   //---------------------------------------------------------------------------
   // We will make a fast path for this call to arraycopy.
   // We have the following tests left to perform:
   //
   // (3) src and dest must not be null.
   // (4) src_offset must not be negative.
   // (5) dest_offset must not be negative.
   // (6) length must not be negative.
   // (7) src_offset + length must not exceed length of src.
   // (8) dest_offset + length must not exceed length of dest.
   // (9) each element of an oop array must be assignable
   RegionNode* slow_region = new (C) RegionNode(1);
   record_for_igvn(slow_region);
   // (3) operands must not be null
   // We currently perform our null checks with the null_check routine.
   // This means that the null exceptions will be reported in the caller
   // rather than (correctly) reported inside of the native arraycopy call.
   // This should be corrected, given time.  We do our null check with the
   // stack pointer restored.
   src  = null_check(src,  T_ARRAY);
   dest = null_check(dest, T_ARRAY);
   // (4) src_offset must not be negative.
   generate_negative_guard(src_offset, slow_region);
   // (5) dest_offset must not be negative.
   generate_negative_guard(dest_offset, slow_region);
   // (6) length must not be negative (moved to generate_arraycopy()).
   // generate_negative_guard(length, slow_region);
   // (7) src_offset + length must not exceed length of src.
   generate_limit_guard(src_offset, length,
                        load_array_length(src),
                        slow_region);
   // (8) dest_offset + length must not exceed length of dest.
   generate_limit_guard(dest_offset, length,
                        load_array_length(dest),
                        slow_region);
   // (9) each element of an oop array must be assignable
   // The generate_arraycopy subroutine checks this.
   // This is where the memory effects are placed:
   const TypePtr* adr_type = TypeAryPtr::get_array_body_type(dest_elem);
   generate_arraycopy(adr_type, dest_elem,
                      src, src_offset, dest, dest_offset, length,
                      false, false, slow_region);
   return true;
 }
 //-----------------------------generate_arraycopy----------------------
 // Generate an optimized call to arraycopy.
 // Caller must guard against non-arrays.
 // Caller must determine a common array basic-type for both arrays.
 // Caller must validate offsets against array bounds.
 // The slow_region has already collected guard failure paths
 // (such as out of bounds length or non-conformable array types).
 // The generated code has this shape, in general:
 //
 //     if (length == 0)  return   // via zero_path
 //     slowval = -1
 //     if (types unknown) {
 //       slowval = call generic copy loop
 //       if (slowval == 0)  return  // via checked_path
 //     } else if (indexes in bounds) {
 //       if ((is object array) && !(array type check)) {
 //         slowval = call checked copy loop
 //         if (slowval == 0)  return  // via checked_path
 //       } else {
 //         call bulk copy loop
 //         return  // via fast_path
 //       }
 //     }
 //     // adjust params for remaining work:
 //     if (slowval != -1) {
 //       n = -1^slowval; src_offset += n; dest_offset += n; length -= n
 //     }
 //   slow_region:
 //     call slow arraycopy(src, src_offset, dest, dest_offset, length)
 //     return  // via slow_call_path
 //
 // This routine is used from several intrinsics:  System.arraycopy,
 // Object.clone (the array subcase), and Arrays.copyOf[Range].
 //
 void
 LibraryCallKit::generate_arraycopy(const TypePtr* adr_type,
                                    BasicType basic_elem_type,
                                    Node* src,  Node* src_offset,
                                    Node* dest, Node* dest_offset,
                                    Node* copy_length,
                                    bool disjoint_bases,
                                    bool length_never_negative,
                                    RegionNode* slow_region) {
   if (slow_region == NULL) {
     slow_region = new(C) RegionNode(1);
     record_for_igvn(slow_region);
   }
   Node* original_dest      = dest;
   AllocateArrayNode* alloc = NULL;  // used for zeroing, if needed
   bool  dest_uninitialized = false;
   // See if this is the initialization of a newly-allocated array.
   // If so, we will take responsibility here for initializing it to zero.
   // (Note:  Because tightly_coupled_allocation performs checks on the
   // out-edges of the dest, we need to avoid making derived pointers
   // from it until we have checked its uses.)
   if (ReduceBulkZeroing
       && !ZeroTLAB              // pointless if already zeroed
       && basic_elem_type != T_CONFLICT // avoid corner case
       && !src->eqv_uncast(dest)
       && ((alloc = tightly_coupled_allocation(dest, slow_region))
           != NULL)
       && _gvn.find_int_con(alloc->in(AllocateNode::ALength), 1) > 0
       && alloc->maybe_set_complete(&_gvn)) {
     // "You break it, you buy it."
     InitializeNode* init = alloc->initialization();
     assert(init->is_complete(), "we just did this");
     init->set_complete_with_arraycopy();
     assert(dest->is_CheckCastPP(), "sanity");
     assert(dest->in(0)->in(0) == init, "dest pinned");
     adr_type = TypeRawPtr::BOTTOM;  // all initializations are into raw memory
     // From this point on, every exit path is responsible for
     // initializing any non-copied parts of the object to zero.
     // Also, if this flag is set we make sure that arraycopy interacts properly
     // with G1, eliding pre-barriers. See CR 6627983.
     dest_uninitialized = true;
   } else {
     // No zeroing elimination here.
     alloc             = NULL;
     //original_dest   = dest;
     //dest_uninitialized = false;
   }
   // Results are placed here:
   enum { fast_path        = 1,  // normal void-returning assembly stub
          checked_path     = 2,  // special assembly stub with cleanup
          slow_call_path   = 3,  // something went wrong; call the VM
          zero_path        = 4,  // bypass when length of copy is zero
          bcopy_path       = 5,  // copy primitive array by 64-bit blocks
          PATH_LIMIT       = 6
   };
   RegionNode* result_region = new(C) RegionNode(PATH_LIMIT);
   PhiNode*    result_i_o    = new(C) PhiNode(result_region, Type::ABIO);
   PhiNode*    result_memory = new(C) PhiNode(result_region, Type::MEMORY, adr_type);
   record_for_igvn(result_region);
   _gvn.set_type_bottom(result_i_o);
   _gvn.set_type_bottom(result_memory);
   assert(adr_type != TypePtr::BOTTOM, "must be RawMem or a T[] slice");
   // The slow_control path:
   Node* slow_control;
   Node* slow_i_o = i_o();
   Node* slow_mem = memory(adr_type);
   debug_only(slow_control = (Node*) badAddress);
   // Checked control path:
   Node* checked_control = top();
   Node* checked_mem     = NULL;
   Node* checked_i_o     = NULL;
   Node* checked_value   = NULL;
   if (basic_elem_type == T_CONFLICT) {
     assert(!dest_uninitialized, "");
     Node* cv = generate_generic_arraycopy(adr_type,
                                           src, src_offset, dest, dest_offset,
                                           copy_length, dest_uninitialized);
     if (cv == NULL)  cv = intcon(-1);  // failure (no stub available)
     checked_control = control();
     checked_i_o     = i_o();
     checked_mem     = memory(adr_type);
     checked_value   = cv;
     set_control(top());         // no fast path
   }
   Node* not_pos = generate_nonpositive_guard(copy_length, length_never_negative);
   if (not_pos != NULL) {
     PreserveJVMState pjvms(this);
     set_control(not_pos);
     // (6) length must not be negative.
     if (!length_never_negative) {
       generate_negative_guard(copy_length, slow_region);
     }
     // copy_length is 0.
     if (!stopped() && dest_uninitialized) {
       Node* dest_length = alloc->in(AllocateNode::ALength);
       if (copy_length->eqv_uncast(dest_length)
           || _gvn.find_int_con(dest_length, 1) <= 0) {
         // There is no zeroing to do. No need for a secondary raw memory barrier.
       } else {
         // Clear the whole thing since there are no source elements to copy.
         generate_clear_array(adr_type, dest, basic_elem_type,
                              intcon(0), NULL,
                              alloc->in(AllocateNode::AllocSize));
         // Use a secondary InitializeNode as raw memory barrier.
         // Currently it is needed only on this path since other
         // paths have stub or runtime calls as raw memory barriers.
         InitializeNode* init = insert_mem_bar_volatile(Op_Initialize,
                                                        Compile::AliasIdxRaw,
                                                        top())->as_Initialize();
         init->set_complete(&_gvn);  // (there is no corresponding AllocateNode)
       }
     }
     // Present the results of the fast call.
     result_region->init_req(zero_path, control());
     result_i_o   ->init_req(zero_path, i_o());
     result_memory->init_req(zero_path, memory(adr_type));
   }
   if (!stopped() && dest_uninitialized) {
     // We have to initialize the *uncopied* part of the array to zero.
     // The copy destination is the slice dest[off..off+len].  The other slices
     // are dest_head = dest[0..off] and dest_tail = dest[off+len..dest.length].
     Node* dest_size   = alloc->in(AllocateNode::AllocSize);
     Node* dest_length = alloc->in(AllocateNode::ALength);
     Node* dest_tail   = _gvn.transform(new(C) AddINode(dest_offset,
                                                           copy_length));
     // If there is a head section that needs zeroing, do it now.
     if (find_int_con(dest_offset, -1) != 0) {
       generate_clear_array(adr_type, dest, basic_elem_type,
                            intcon(0), dest_offset,
                            NULL);
     }
     // Next, perform a dynamic check on the tail length.
     // It is often zero, and we can win big if we prove this.
     // There are two wins:  Avoid generating the ClearArray
     // with its attendant messy index arithmetic, and upgrade
     // the copy to a more hardware-friendly word size of 64 bits.
     Node* tail_ctl = NULL;
     if (!stopped() && !dest_tail->eqv_uncast(dest_length)) {
       Node* cmp_lt   = _gvn.transform(new(C) CmpINode(dest_tail, dest_length));
       Node* bol_lt   = _gvn.transform(new(C) BoolNode(cmp_lt, BoolTest::lt));
       tail_ctl = generate_slow_guard(bol_lt, NULL);
       assert(tail_ctl != NULL || !stopped(), "must be an outcome");
     }
     // At this point, let's assume there is no tail.
     if (!stopped() && alloc != NULL && basic_elem_type != T_OBJECT) {
       // There is no tail.  Try an upgrade to a 64-bit copy.
       bool didit = false;
       { PreserveJVMState pjvms(this);
         didit = generate_block_arraycopy(adr_type, basic_elem_type, alloc,
                                          src, src_offset, dest, dest_offset,
                                          dest_size, dest_uninitialized);
         if (didit) {
           // Present the results of the block-copying fast call.
           result_region->init_req(bcopy_path, control());
           result_i_o   ->init_req(bcopy_path, i_o());
           result_memory->init_req(bcopy_path, memory(adr_type));
         }
       }
       if (didit)
         set_control(top());     // no regular fast path
     }
     // Clear the tail, if any.
     if (tail_ctl != NULL) {
       Node* notail_ctl = stopped() ? NULL : control();
       set_control(tail_ctl);
       if (notail_ctl == NULL) {
         generate_clear_array(adr_type, dest, basic_elem_type,
                              dest_tail, NULL,
                              dest_size);
       } else {
         // Make a local merge.
         Node* done_ctl = new(C) RegionNode(3);
         Node* done_mem = new(C) PhiNode(done_ctl, Type::MEMORY, adr_type);
         done_ctl->init_req(1, notail_ctl);
         done_mem->init_req(1, memory(adr_type));
         generate_clear_array(adr_type, dest, basic_elem_type,
                              dest_tail, NULL,
                              dest_size);
         done_ctl->init_req(2, control());
         done_mem->init_req(2, memory(adr_type));
         set_control( _gvn.transform(done_ctl));
         set_memory(  _gvn.transform(done_mem), adr_type );
       }
     }
   }
   BasicType copy_type = basic_elem_type;
   assert(basic_elem_type != T_ARRAY, "caller must fix this");
   if (!stopped() && copy_type == T_OBJECT) {
     // If src and dest have compatible element types, we can copy bits.
     // Types S[] and D[] are compatible if D is a supertype of S.
     //
     // If they are not, we will use checked_oop_disjoint_arraycopy,
     // which performs a fast optimistic per-oop check, and backs off
     // further to JVM_ArrayCopy on the first per-oop check that fails.
     // (Actually, we don't move raw bits only; the GC requires card marks.)
     // Get the Klass* for both src and dest
     Node* src_klass  = load_object_klass(src);
     Node* dest_klass = load_object_klass(dest);
     // Generate the subtype check.
     // This might fold up statically, or then again it might not.
     //
     // Non-static example:  Copying List<String>.elements to a new String[].
     // The backing store for a List<String> is always an Object[],
     // but its elements are always type String, if the generic types
     // are correct at the source level.
     //
     // Test S[] against D[], not S against D, because (probably)
     // the secondary supertype cache is less busy for S[] than S.
     // This usually only matters when D is an interface.
     Node* not_subtype_ctrl = gen_subtype_check(src_klass, dest_klass);
     // Plug failing path into checked_oop_disjoint_arraycopy
     if (not_subtype_ctrl != top()) {
       PreserveJVMState pjvms(this);
       set_control(not_subtype_ctrl);
       // (At this point we can assume disjoint_bases, since types differ.)
       int ek_offset = in_bytes(ObjArrayKlass::element_klass_offset());
       Node* p1 = basic_plus_adr(dest_klass, ek_offset);
       Node* n1 = LoadKlassNode::make(_gvn, immutable_memory(), p1, TypeRawPtr::BOTTOM);
       Node* dest_elem_klass = _gvn.transform(n1);
       Node* cv = generate_checkcast_arraycopy(adr_type,
                                               dest_elem_klass,
                                               src, src_offset, dest, dest_offset,
                                               ConvI2X(copy_length), dest_uninitialized);
       if (cv == NULL)  cv = intcon(-1);  // failure (no stub available)
       checked_control = control();
       checked_i_o     = i_o();
       checked_mem     = memory(adr_type);
       checked_value   = cv;
     }
     // At this point we know we do not need type checks on oop stores.
     // Let's see if we need card marks:
     if (alloc != NULL && use_ReduceInitialCardMarks()) {
       // If we do not need card marks, copy using the jint or jlong stub.
       copy_type = LP64_ONLY(UseCompressedOops ? T_INT : T_LONG) NOT_LP64(T_INT);
       assert(type2aelembytes(basic_elem_type) == type2aelembytes(copy_type),
              "sizes agree");
     }
   }
   if (!stopped()) {
     // Generate the fast path, if possible.
     PreserveJVMState pjvms(this);
     generate_unchecked_arraycopy(adr_type, copy_type, disjoint_bases,
                                  src, src_offset, dest, dest_offset,
                                  ConvI2X(copy_length), dest_uninitialized);
     // Present the results of the fast call.
     result_region->init_req(fast_path, control());
     result_i_o   ->init_req(fast_path, i_o());
     result_memory->init_req(fast_path, memory(adr_type));
   }
   // Here are all the slow paths up to this point, in one bundle:
   slow_control = top();
   if (slow_region != NULL)
     slow_control = _gvn.transform(slow_region);
   DEBUG_ONLY(slow_region = (RegionNode*)badAddress);
   set_control(checked_control);
   if (!stopped()) {
     // Clean up after the checked call.
     // The returned value is either 0 or -1^K,
     // where K = number of partially transferred array elements.
     Node* cmp = _gvn.transform(new(C) CmpINode(checked_value, intcon(0)));
     Node* bol = _gvn.transform(new(C) BoolNode(cmp, BoolTest::eq));
     IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN);
     // If it is 0, we are done, so transfer to the end.
     Node* checks_done = _gvn.transform(new(C) IfTrueNode(iff));
     result_region->init_req(checked_path, checks_done);
     result_i_o   ->init_req(checked_path, checked_i_o);
     result_memory->init_req(checked_path, checked_mem);
     // If it is not zero, merge into the slow call.
     set_control( _gvn.transform(new(C) IfFalseNode(iff) ));
     RegionNode* slow_reg2 = new(C) RegionNode(3);
     PhiNode*    slow_i_o2 = new(C) PhiNode(slow_reg2, Type::ABIO);
     PhiNode*    slow_mem2 = new(C) PhiNode(slow_reg2, Type::MEMORY, adr_type);
     record_for_igvn(slow_reg2);
     slow_reg2  ->init_req(1, slow_control);
     slow_i_o2  ->init_req(1, slow_i_o);
     slow_mem2  ->init_req(1, slow_mem);
     slow_reg2  ->init_req(2, control());
     slow_i_o2  ->init_req(2, checked_i_o);
     slow_mem2  ->init_req(2, checked_mem);
     slow_control = _gvn.transform(slow_reg2);
     slow_i_o     = _gvn.transform(slow_i_o2);
     slow_mem     = _gvn.transform(slow_mem2);
     if (alloc != NULL) {
       // We'll restart from the very beginning, after zeroing the whole thing.
       // This can cause double writes, but that's OK since dest is brand new.
       // So we ignore the low 31 bits of the value returned from the stub.
     } else {
       // We must continue the copy exactly where it failed, or else
       // another thread might see the wrong number of writes to dest.
       Node* checked_offset = _gvn.transform(new(C) XorINode(checked_value, intcon(-1)));
       Node* slow_offset    = new(C) PhiNode(slow_reg2, TypeInt::INT);
       slow_offset->init_req(1, intcon(0));
       slow_offset->init_req(2, checked_offset);
       slow_offset  = _gvn.transform(slow_offset);
       // Adjust the arguments by the conditionally incoming offset.
       Node* src_off_plus  = _gvn.transform(new(C) AddINode(src_offset,  slow_offset));
       Node* dest_off_plus = _gvn.transform(new(C) AddINode(dest_offset, slow_offset));
       Node* length_minus  = _gvn.transform(new(C) SubINode(copy_length, slow_offset));
       // Tweak the node variables to adjust the code produced below:
       src_offset  = src_off_plus;
       dest_offset = dest_off_plus;
       copy_length = length_minus;
     }
   }
   set_control(slow_control);
   if (!stopped()) {
     // Generate the slow path, if needed.
     PreserveJVMState pjvms(this);   // replace_in_map may trash the map
     set_memory(slow_mem, adr_type);
     set_i_o(slow_i_o);
     if (dest_uninitialized) {
       generate_clear_array(adr_type, dest, basic_elem_type,
                            intcon(0), NULL,
                            alloc->in(AllocateNode::AllocSize));
     }
     generate_slow_arraycopy(adr_type,
                             src, src_offset, dest, dest_offset,
                             copy_length, /*dest_uninitialized*/false);
     result_region->init_req(slow_call_path, control());
     result_i_o   ->init_req(slow_call_path, i_o());
     result_memory->init_req(slow_call_path, memory(adr_type));
   }
   // Remove unused edges.
   for (uint i = 1; i < result_region->req(); i++) {
     if (result_region->in(i) == NULL)
       result_region->init_req(i, top());
   }
   // Finished; return the combined state.
   set_control( _gvn.transform(result_region));
   set_i_o(     _gvn.transform(result_i_o)    );
   set_memory(  _gvn.transform(result_memory), adr_type );
   // The memory edges above are precise in order to model effects around
   // array copies accurately to allow value numbering of field loads around
   // arraycopy.  Such field loads, both before and after, are common in Java
   // collections and similar classes involving header/array data structures.
   //
   // But with low number of register or when some registers are used or killed
   // by arraycopy calls it causes registers spilling on stack. See 6544710.
   // The next memory barrier is added to avoid it. If the arraycopy can be
   // optimized away (which it can, sometimes) then we can manually remove
   // the membar also.
   //
   // Do not let reads from the cloned object float above the arraycopy.
   if (alloc != NULL) {
     // Do not let stores that initialize this object be reordered with
     // a subsequent store that would make this object accessible by
     // other threads.
     // Record what AllocateNode this StoreStore protects so that
     // escape analysis can go from the MemBarStoreStoreNode to the
     // AllocateNode and eliminate the MemBarStoreStoreNode if possible
     // based on the escape status of the AllocateNode.
     insert_mem_bar(Op_MemBarStoreStore, alloc->proj_out(AllocateNode::RawAddress));
   } else if (InsertMemBarAfterArraycopy)
     insert_mem_bar(Op_MemBarCPUOrder);
 }
 // Helper function which determines if an arraycopy immediately follows
 // an allocation, with no intervening tests or other escapes for the object.
 AllocateArrayNode*
 LibraryCallKit::tightly_coupled_allocation(Node* ptr,
                                            RegionNode* slow_region) {
   if (stopped())             return NULL;  // no fast path
   if (C->AliasLevel() == 0)  return NULL;  // no MergeMems around
   AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(ptr, &_gvn);
   if (alloc == NULL)  return NULL;
   Node* rawmem = memory(Compile::AliasIdxRaw);
   // Is the allocation's memory state untouched?
   if (!(rawmem->is_Proj() && rawmem->in(0)->is_Initialize())) {
     // Bail out if there have been raw-memory effects since the allocation.
     // (Example:  There might have been a call or safepoint.)
     return NULL;
   }
   rawmem = rawmem->in(0)->as_Initialize()->memory(Compile::AliasIdxRaw);
   if (!(rawmem->is_Proj() && rawmem->in(0) == alloc)) {
     return NULL;
   }
   // There must be no unexpected observers of this allocation.
   for (DUIterator_Fast imax, i = ptr->fast_outs(imax); i < imax; i++) {
     Node* obs = ptr->fast_out(i);
     if (obs != this->map()) {
       return NULL;
     }
   }
   // This arraycopy must unconditionally follow the allocation of the ptr.
   Node* alloc_ctl = ptr->in(0);
   assert(just_allocated_object(alloc_ctl) == ptr, "most recent allo");
   Node* ctl = control();
   while (ctl != alloc_ctl) {
     // There may be guards which feed into the slow_region.
     // Any other control flow means that we might not get a chance
     // to finish initializing the allocated object.
     if ((ctl->is_IfFalse() || ctl->is_IfTrue()) && ctl->in(0)->is_If()) {
       IfNode* iff = ctl->in(0)->as_If();
       Node* not_ctl = iff->proj_out(1 - ctl->as_Proj()->_con);
       assert(not_ctl != NULL && not_ctl != ctl, "found alternate");
       if (slow_region != NULL && slow_region->find_edge(not_ctl) >= 1) {
         ctl = iff->in(0);       // This test feeds the known slow_region.
         continue;
       }
       // One more try:  Various low-level checks bottom out in
       // uncommon traps.  If the debug-info of the trap omits
       // any reference to the allocation, as we've already
       // observed, then there can be no objection to the trap.
       bool found_trap = false;
       for (DUIterator_Fast jmax, j = not_ctl->fast_outs(jmax); j < jmax; j++) {
         Node* obs = not_ctl->fast_out(j);
         if (obs->in(0) == not_ctl && obs->is_Call() &&
             (obs->as_Call()->entry_point() == SharedRuntime::uncommon_trap_blob()->entry_point())) {
           found_trap = true; break;
         }
       }
       if (found_trap) {
         ctl = iff->in(0);       // This test feeds a harmless uncommon trap.
         continue;
       }
     }
     return NULL;
   }
   // If we get this far, we have an allocation which immediately
   // precedes the arraycopy, and we can take over zeroing the new object.
   // The arraycopy will finish the initialization, and provide
   // a new control state to which we will anchor the destination pointer.
   return alloc;
 }
 // Helper for initialization of arrays, creating a ClearArray.
 // It writes zero bits in [start..end), within the body of an array object.
 // The memory effects are all chained onto the 'adr_type' alias category.
 //
 // Since the object is otherwise uninitialized, we are free
 // to put a little "slop" around the edges of the cleared area,
 // as long as it does not go back into the array's header,
 // or beyond the array end within the heap.
 //
 // The lower edge can be rounded down to the nearest jint and the
 // upper edge can be rounded up to the nearest MinObjAlignmentInBytes.
 //
 // Arguments:
 //   adr_type           memory slice where writes are generated
 //   dest               oop of the destination array
 //   basic_elem_type    element type of the destination
 //   slice_idx          array index of first element to store
 //   slice_len          number of elements to store (or NULL)
 //   dest_size          total size in bytes of the array object
 //
 // Exactly one of slice_len or dest_size must be non-NULL.
 // If dest_size is non-NULL, zeroing extends to the end of the object.
 // If slice_len is non-NULL, the slice_idx value must be a constant.
 void
 LibraryCallKit::generate_clear_array(const TypePtr* adr_type,
                                      Node* dest,
                                      BasicType basic_elem_type,
                                      Node* slice_idx,
                                      Node* slice_len,
                                      Node* dest_size) {
   // one or the other but not both of slice_len and dest_size:
   assert((slice_len != NULL? 1: 0) + (dest_size != NULL? 1: 0) == 1, "");
   if (slice_len == NULL)  slice_len = top();
   if (dest_size == NULL)  dest_size = top();
   // operate on this memory slice:
   Node* mem = memory(adr_type); // memory slice to operate on
   // scaling and rounding of indexes:
   int scale = exact_log2(type2aelembytes(basic_elem_type));
   int abase = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
   int clear_low = (-1 << scale) & (BytesPerInt  - 1);
   int bump_bit  = (-1 << scale) & BytesPerInt;
   // determine constant starts and ends
   const intptr_t BIG_NEG = -128;
   assert(BIG_NEG + 2*abase < 0, "neg enough");
   intptr_t slice_idx_con = (intptr_t) find_int_con(slice_idx, BIG_NEG);
   intptr_t slice_len_con = (intptr_t) find_int_con(slice_len, BIG_NEG);
   if (slice_len_con == 0) {
     return;                     // nothing to do here
   }
   intptr_t start_con = (abase + (slice_idx_con << scale)) & ~clear_low;
   intptr_t end_con   = find_intptr_t_con(dest_size, -1);
   if (slice_idx_con >= 0 && slice_len_con >= 0) {
     assert(end_con < 0, "not two cons");
     end_con = round_to(abase + ((slice_idx_con + slice_len_con) << scale),
                        BytesPerLong);
   }
   if (start_con >= 0 && end_con >= 0) {
     // Constant start and end.  Simple.
     mem = ClearArrayNode::clear_memory(control(), mem, dest,
                                        start_con, end_con, &_gvn);
   } else if (start_con >= 0 && dest_size != top()) {
     // Constant start, pre-rounded end after the tail of the array.
     Node* end = dest_size;
     mem = ClearArrayNode::clear_memory(control(), mem, dest,
                                        start_con, end, &_gvn);
   } else if (start_con >= 0 && slice_len != top()) {
     // Constant start, non-constant end.  End needs rounding up.
     // End offset = round_up(abase + ((slice_idx_con + slice_len) << scale), 8)
     intptr_t end_base  = abase + (slice_idx_con << scale);
     int      end_round = (-1 << scale) & (BytesPerLong  - 1);
     Node*    end       = ConvI2X(slice_len);
     if (scale != 0)
       end = _gvn.transform(new(C) LShiftXNode(end, intcon(scale) ));
     end_base += end_round;
     end = _gvn.transform(new(C) AddXNode(end, MakeConX(end_base)));
     end = _gvn.transform(new(C) AndXNode(end, MakeConX(~end_round)));
     mem = ClearArrayNode::clear_memory(control(), mem, dest,
                                        start_con, end, &_gvn);
   } else if (start_con < 0 && dest_size != top()) {
     // Non-constant start, pre-rounded end after the tail of the array.
     // This is almost certainly a "round-to-end" operation.
     Node* start = slice_idx;
     start = ConvI2X(start);
     if (scale != 0)
       start = _gvn.transform(new(C) LShiftXNode( start, intcon(scale) ));
     start = _gvn.transform(new(C) AddXNode(start, MakeConX(abase)));
     if ((bump_bit | clear_low) != 0) {
       int to_clear = (bump_bit | clear_low);
       // Align up mod 8, then store a jint zero unconditionally
       // just before the mod-8 boundary.
       if (((abase + bump_bit) & ~to_clear) - bump_bit
           < arrayOopDesc::length_offset_in_bytes() + BytesPerInt) {
         bump_bit = 0;
         assert((abase & to_clear) == 0, "array base must be long-aligned");
       } else {
         // Bump 'start' up to (or past) the next jint boundary:
         start = _gvn.transform(new(C) AddXNode(start, MakeConX(bump_bit)));
         assert((abase & clear_low) == 0, "array base must be int-aligned");
       }
       // Round bumped 'start' down to jlong boundary in body of array.
       start = _gvn.transform(new(C) AndXNode(start, MakeConX(~to_clear)));
       if (bump_bit != 0) {
         // Store a zero to the immediately preceding jint:
         Node* x1 = _gvn.transform(new(C) AddXNode(start, MakeConX(-bump_bit)));
         Node* p1 = basic_plus_adr(dest, x1);
         mem = StoreNode::make(_gvn, control(), mem, p1, adr_type, intcon(0), T_INT, MemNode::unordered);
         mem = _gvn.transform(mem);
       }
     }
     Node* end = dest_size; // pre-rounded
     mem = ClearArrayNode::clear_memory(control(), mem, dest,
                                        start, end, &_gvn);
   } else {
     // Non-constant start, unrounded non-constant end.
     // (Nobody zeroes a random midsection of an array using this routine.)
     ShouldNotReachHere();       // fix caller
   }
   // Done.
   set_memory(mem, adr_type);
 }
 bool
 LibraryCallKit::generate_block_arraycopy(const TypePtr* adr_type,
                                          BasicType basic_elem_type,
                                          AllocateNode* alloc,
                                          Node* src,  Node* src_offset,
                                          Node* dest, Node* dest_offset,
                                          Node* dest_size, bool dest_uninitialized) {
   // See if there is an advantage from block transfer.
   int scale = exact_log2(type2aelembytes(basic_elem_type));
   if (scale >= LogBytesPerLong)
     return false;               // it is already a block transfer
   // Look at the alignment of the starting offsets.
   int abase = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
   intptr_t src_off_con  = (intptr_t) find_int_con(src_offset, -1);
   intptr_t dest_off_con = (intptr_t) find_int_con(dest_offset, -1);
   if (src_off_con < 0 || dest_off_con < 0)
     // At present, we can only understand constants.
     return false;
   intptr_t src_off  = abase + (src_off_con  << scale);
   intptr_t dest_off = abase + (dest_off_con << scale);
   if (((src_off | dest_off) & (BytesPerLong-1)) != 0) {
     // Non-aligned; too bad.
     // One more chance:  Pick off an initial 32-bit word.
     // This is a common case, since abase can be odd mod 8.
     if (((src_off | dest_off) & (BytesPerLong-1)) == BytesPerInt &&
         ((src_off ^ dest_off) & (BytesPerLong-1)) == 0) {
       Node* sptr = basic_plus_adr(src,  src_off);
       Node* dptr = basic_plus_adr(dest, dest_off);
       Node* sval = make_load(control(), sptr, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
       store_to_memory(control(), dptr, sval, T_INT, adr_type, MemNode::unordered);
       src_off += BytesPerInt;
       dest_off += BytesPerInt;
     } else {
       return false;
     }
   }
   assert(src_off % BytesPerLong == 0, "");
   assert(dest_off % BytesPerLong == 0, "");
   // Do this copy by giant steps.
   Node* sptr  = basic_plus_adr(src,  src_off);
   Node* dptr  = basic_plus_adr(dest, dest_off);
   Node* countx = dest_size;
   countx = _gvn.transform(new (C) SubXNode(countx, MakeConX(dest_off)));
   countx = _gvn.transform(new (C) URShiftXNode(countx, intcon(LogBytesPerLong)));
   bool disjoint_bases = true;   // since alloc != NULL
   generate_unchecked_arraycopy(adr_type, T_LONG, disjoint_bases,
                                sptr, NULL, dptr, NULL, countx, dest_uninitialized);
   return true;
 }
 // Helper function; generates code for the slow case.
 // We make a call to a runtime method which emulates the native method,
 // but without the native wrapper overhead.
 void
 LibraryCallKit::generate_slow_arraycopy(const TypePtr* adr_type,
                                         Node* src,  Node* src_offset,
                                         Node* dest, Node* dest_offset,
                                         Node* copy_length, bool dest_uninitialized) {
   assert(!dest_uninitialized, "Invariant");
   Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON,
                                  OptoRuntime::slow_arraycopy_Type(),
                                  OptoRuntime::slow_arraycopy_Java(),
                                  "slow_arraycopy", adr_type,
                                  src, src_offset, dest, dest_offset,
                                  copy_length);
   // Handle exceptions thrown by this fellow:
   make_slow_call_ex(call, env()->Throwable_klass(), false);
 }
 // Helper function; generates code for cases requiring runtime checks.
 Node*
 LibraryCallKit::generate_checkcast_arraycopy(const TypePtr* adr_type,
                                              Node* dest_elem_klass,
                                              Node* src,  Node* src_offset,
                                              Node* dest, Node* dest_offset,
                                              Node* copy_length, bool dest_uninitialized) {
   if (stopped())  return NULL;
   address copyfunc_addr = StubRoutines::checkcast_arraycopy(dest_uninitialized);
   if (copyfunc_addr == NULL) { // Stub was not generated, go slow path.
     return NULL;
   }
   // Pick out the parameters required to perform a store-check
   // for the target array.  This is an optimistic check.  It will
   // look in each non-null element's class, at the desired klass's
   // super_check_offset, for the desired klass.
   int sco_offset = in_bytes(Klass::super_check_offset_offset());
   Node* p3 = basic_plus_adr(dest_elem_klass, sco_offset);
   Node* n3 = new(C) LoadINode(NULL, memory(p3), p3, _gvn.type(p3)->is_ptr(), TypeInt::INT, MemNode::unordered);
   Node* check_offset = ConvI2X(_gvn.transform(n3));
   Node* check_value  = dest_elem_klass;
   Node* src_start  = array_element_address(src,  src_offset,  T_OBJECT);
   Node* dest_start = array_element_address(dest, dest_offset, T_OBJECT);
   // (We know the arrays are never conjoint, because their types differ.)
   Node* call = make_runtime_call(RC_LEAF|RC_NO_FP,
                                  OptoRuntime::checkcast_arraycopy_Type(),
                                  copyfunc_addr, "checkcast_arraycopy", adr_type,
                                  // five arguments, of which two are
                                  // intptr_t (jlong in LP64)
                                  src_start, dest_start,
                                  copy_length XTOP,
                                  check_offset XTOP,
                                  check_value);
   return _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms));
 }
 // Helper function; generates code for cases requiring runtime checks.
 Node*
 LibraryCallKit::generate_generic_arraycopy(const TypePtr* adr_type,
                                            Node* src,  Node* src_offset,
                                            Node* dest, Node* dest_offset,
                                            Node* copy_length, bool dest_uninitialized) {
   assert(!dest_uninitialized, "Invariant");
   if (stopped())  return NULL;
   address copyfunc_addr = StubRoutines::generic_arraycopy();
   if (copyfunc_addr == NULL) { // Stub was not generated, go slow path.
     return NULL;
   }
   Node* call = make_runtime_call(RC_LEAF|RC_NO_FP,
                     OptoRuntime::generic_arraycopy_Type(),
                     copyfunc_addr, "generic_arraycopy", adr_type,
                     src, src_offset, dest, dest_offset, copy_length);
   return _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms));
 }
 // Helper function; generates the fast out-of-line call to an arraycopy stub.
 void
 LibraryCallKit::generate_unchecked_arraycopy(const TypePtr* adr_type,
                                              BasicType basic_elem_type,
                                              bool disjoint_bases,
                                              Node* src,  Node* src_offset,
                                              Node* dest, Node* dest_offset,
                                              Node* copy_length, bool dest_uninitialized) {
   if (stopped())  return;               // nothing to do
   Node* src_start  = src;
   Node* dest_start = dest;
   if (src_offset != NULL || dest_offset != NULL) {
     assert(src_offset != NULL && dest_offset != NULL, "");
     src_start  = array_element_address(src,  src_offset,  basic_elem_type);
     dest_start = array_element_address(dest, dest_offset, basic_elem_type);
   }
   // Figure out which arraycopy runtime method to call.
   const char* copyfunc_name = "arraycopy";
   address     copyfunc_addr =
       basictype2arraycopy(basic_elem_type, src_offset, dest_offset,
                           disjoint_bases, copyfunc_name, dest_uninitialized);
   // Call it.  Note that the count_ix value is not scaled to a byte-size.
   make_runtime_call(RC_LEAF|RC_NO_FP,
                     OptoRuntime::fast_arraycopy_Type(),
                     copyfunc_addr, copyfunc_name, adr_type,
                     src_start, dest_start, copy_length XTOP);
 }
 //-------------inline_encodeISOArray-----------------------------------
 // encode char[] to byte[] in ISO_8859_1
 bool LibraryCallKit::inline_encodeISOArray() {
   assert(callee()->signature()->size() == 5, "encodeISOArray has 5 parameters");
   // no receiver since it is static method
   Node *src         = argument(0);
   Node *src_offset  = argument(1);
   Node *dst         = argument(2);
   Node *dst_offset  = argument(3);
   Node *length      = argument(4);
   const Type* src_type = src->Value(&_gvn);
   const Type* dst_type = dst->Value(&_gvn);
   const TypeAryPtr* top_src = src_type->isa_aryptr();
   const TypeAryPtr* top_dest = dst_type->isa_aryptr();
   if (top_src  == NULL || top_src->klass()  == NULL ||
       top_dest == NULL || top_dest->klass() == NULL) {
     // failed array check
     return false;
   }
   // Figure out the size and type of the elements we will be copying.
   BasicType src_elem = src_type->isa_aryptr()->klass()->as_array_klass()->element_type()->basic_type();
   BasicType dst_elem = dst_type->isa_aryptr()->klass()->as_array_klass()->element_type()->basic_type();
   if (src_elem != T_CHAR || dst_elem != T_BYTE) {
     return false;
   }
   Node* src_start = array_element_address(src, src_offset, src_elem);
   Node* dst_start = array_element_address(dst, dst_offset, dst_elem);
   // 'src_start' points to src array + scaled offset
   // 'dst_start' points to dst array + scaled offset
   const TypeAryPtr* mtype = TypeAryPtr::BYTES;
   Node* enc = new (C) EncodeISOArrayNode(control(), memory(mtype), src_start, dst_start, length);
   enc = _gvn.transform(enc);
   Node* res_mem = _gvn.transform(new (C) SCMemProjNode(enc));
   set_memory(res_mem, mtype);
   set_result(enc);
   return true;
 }
 /**
  * Calculate CRC32 for byte.
  * int java.util.zip.CRC32.update(int crc, int b)
  */
 bool LibraryCallKit::inline_updateCRC32() {
   assert(UseCRC32Intrinsics, "need AVX and LCMUL instructions support");
   assert(callee()->signature()->size() == 2, "update has 2 parameters");
   // no receiver since it is static method
   Node* crc  = argument(0); // type: int
   Node* b    = argument(1); // type: int
   /*
    *    int c = ~ crc;
    *    b = timesXtoThe32[(b ^ c) & 0xFF];
    *    b = b ^ (c >>> 8);
    *    crc = ~b;
    */
   Node* M1 = intcon(-1);
   crc = _gvn.transform(new (C) XorINode(crc, M1));
   Node* result = _gvn.transform(new (C) XorINode(crc, b));
   result = _gvn.transform(new (C) AndINode(result, intcon(0xFF)));
   Node* base = makecon(TypeRawPtr::make(StubRoutines::crc_table_addr()));
   Node* offset = _gvn.transform(new (C) LShiftINode(result, intcon(0x2)));
   Node* adr = basic_plus_adr(top(), base, ConvI2X(offset));
   result = make_load(control(), adr, TypeInt::INT, T_INT, MemNode::unordered);
   crc = _gvn.transform(new (C) URShiftINode(crc, intcon(8)));
   result = _gvn.transform(new (C) XorINode(crc, result));
   result = _gvn.transform(new (C) XorINode(result, M1));
   set_result(result);
   return true;
 }
 /**
  * Calculate CRC32 for byte[] array.
  * int java.util.zip.CRC32.updateBytes(int crc, byte[] buf, int off, int len)
  */
 bool LibraryCallKit::inline_updateBytesCRC32() {
   assert(UseCRC32Intrinsics, "need AVX and LCMUL instructions support");
   assert(callee()->signature()->size() == 4, "updateBytes has 4 parameters");
   // no receiver since it is static method
   Node* crc     = argument(0); // type: int
   Node* src     = argument(1); // type: oop
   Node* offset  = argument(2); // type: int
   Node* length  = argument(3); // type: int
   const Type* src_type = src->Value(&_gvn);
   const TypeAryPtr* top_src = src_type->isa_aryptr();
   if (top_src  == NULL || top_src->klass()  == NULL) {
     // failed array check
     return false;
   }
   // Figure out the size and type of the elements we will be copying.
   BasicType src_elem = src_type->isa_aryptr()->klass()->as_array_klass()->element_type()->basic_type();
   if (src_elem != T_BYTE) {
     return false;
   }
   // 'src_start' points to src array + scaled offset
   Node* src_start = array_element_address(src, offset, src_elem);
   // We assume that range check is done by caller.
   // TODO: generate range check (offset+length < src.length) in debug VM.
   // Call the stub.
   address stubAddr = StubRoutines::updateBytesCRC32();
   const char *stubName = "updateBytesCRC32";
   Node* call = make_runtime_call(RC_LEAF|RC_NO_FP, OptoRuntime::updateBytesCRC32_Type(),
                                  stubAddr, stubName, TypePtr::BOTTOM,
                                  crc, src_start, length);
   Node* result = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms));
   set_result(result);
   return true;
 }
 /**
  * Calculate CRC32 for ByteBuffer.
  * int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)
  */
 bool LibraryCallKit::inline_updateByteBufferCRC32() {
   assert(UseCRC32Intrinsics, "need AVX and LCMUL instructions support");
   assert(callee()->signature()->size() == 5, "updateByteBuffer has 4 parameters and one is long");
   // no receiver since it is static method
   Node* crc     = argument(0); // type: int
   Node* src     = argument(1); // type: long
   Node* offset  = argument(3); // type: int
   Node* length  = argument(4); // type: int
   src = ConvL2X(src);  // adjust Java long to machine word
   Node* base = _gvn.transform(new (C) CastX2PNode(src));
   offset = ConvI2X(offset);
   // 'src_start' points to src array + scaled offset
   Node* src_start = basic_plus_adr(top(), base, offset);
   // Call the stub.
   address stubAddr = StubRoutines::updateBytesCRC32();
   const char *stubName = "updateBytesCRC32";
   Node* call = make_runtime_call(RC_LEAF|RC_NO_FP, OptoRuntime::updateBytesCRC32_Type(),
                                  stubAddr, stubName, TypePtr::BOTTOM,
                                  crc, src_start, length);
   Node* result = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms));
   set_result(result);
   return true;
 }
 //----------------------------inline_reference_get----------------------------
 // public T java.lang.ref.Reference.get();
 bool LibraryCallKit::inline_reference_get() {
   const int referent_offset = java_lang_ref_Reference::referent_offset;
   guarantee(referent_offset > 0, "should have already been set");
   // Get the argument:
   Node* reference_obj = null_check_receiver();
   if (stopped()) return true;
   Node* adr = basic_plus_adr(reference_obj, reference_obj, referent_offset);
   ciInstanceKlass* klass = env()->Object_klass();
   const TypeOopPtr* object_type = TypeOopPtr::make_from_klass(klass);
   Node* no_ctrl = NULL;
   Node* result = make_load(no_ctrl, adr, object_type, T_OBJECT, MemNode::unordered);
   // Use the pre-barrier to record the value in the referent field
   pre_barrier(false /* do_load */,
               control(),
               NULL /* obj */, NULL /* adr */, max_juint /* alias_idx */, NULL /* val */, NULL /* val_type */,
               result /* pre_val */,
               T_OBJECT);
   // Add memory barrier to prevent commoning reads from this field
   // across safepoint since GC can change its value.
   insert_mem_bar(Op_MemBarCPUOrder);
   set_result(result);
   return true;
 }
 Node * LibraryCallKit::load_field_from_object(Node * fromObj, const char * fieldName, const char * fieldTypeString,
                                               bool is_exact=true, bool is_static=false) {
   const TypeInstPtr* tinst = _gvn.type(fromObj)->isa_instptr();
   assert(tinst != NULL, "obj is null");
   assert(tinst->klass()->is_loaded(), "obj is not loaded");
   assert(!is_exact || tinst->klass_is_exact(), "klass not exact");
   ciField* field = tinst->klass()->as_instance_klass()->get_field_by_name(ciSymbol::make(fieldName),
                                                                           ciSymbol::make(fieldTypeString),
                                                                           is_static);
   if (field == NULL) return (Node *) NULL;
   assert (field != NULL, "undefined field");
   // Next code  copied from Parse::do_get_xxx():
   // Compute address and memory type.
   int offset  = field->offset_in_bytes();
   bool is_vol = field->is_volatile();
   ciType* field_klass = field->type();
   assert(field_klass->is_loaded(), "should be loaded");
   const TypePtr* adr_type = C->alias_type(field)->adr_type();
   Node *adr = basic_plus_adr(fromObj, fromObj, offset);
   BasicType bt = field->layout_type();
   // Build the resultant type of the load
   const Type *type = TypeOopPtr::make_from_klass(field_klass->as_klass());
   // Build the load.
   Node* loadedField = make_load(NULL, adr, type, bt, adr_type, MemNode::unordered, is_vol);
   return loadedField;
 }
 //------------------------------inline_aescrypt_Block-----------------------
 bool LibraryCallKit::inline_aescrypt_Block(vmIntrinsics::ID id) {
   address stubAddr;
   const char *stubName;
   assert(UseAES, "need AES instruction support");
   switch(id) {
   case vmIntrinsics::_aescrypt_encryptBlock:
     stubAddr = StubRoutines::aescrypt_encryptBlock();
     stubName = "aescrypt_encryptBlock";
     break;
   case vmIntrinsics::_aescrypt_decryptBlock:
     stubAddr = StubRoutines::aescrypt_decryptBlock();
     stubName = "aescrypt_decryptBlock";
     break;
   }
   if (stubAddr == NULL) return false;
   Node* aescrypt_object = argument(0);
   Node* src             = argument(1);
   Node* src_offset      = argument(2);
   Node* dest            = argument(3);
   Node* dest_offset     = argument(4);
   // (1) src and dest are arrays.
   const Type* src_type = src->Value(&_gvn);
   const Type* dest_type = dest->Value(&_gvn);
   const TypeAryPtr* top_src = src_type->isa_aryptr();
   const TypeAryPtr* top_dest = dest_type->isa_aryptr();
   assert (top_src  != NULL && top_src->klass()  != NULL &&  top_dest != NULL && top_dest->klass() != NULL, "args are strange");
   // for the quick and dirty code we will skip all the checks.
   // we are just trying to get the call to be generated.
   Node* src_start  = src;
   Node* dest_start = dest;
   if (src_offset != NULL || dest_offset != NULL) {
     assert(src_offset != NULL && dest_offset != NULL, "");
     src_start  = array_element_address(src,  src_offset,  T_BYTE);
     dest_start = array_element_address(dest, dest_offset, T_BYTE);
   }
   // now need to get the start of its expanded key array
   // this requires a newer class file that has this array as littleEndian ints, otherwise we revert to java
   Node* k_start = get_key_start_from_aescrypt_object(aescrypt_object);
   if (k_start == NULL) return false;
   if (Matcher::pass_original_key_for_aes()) {
     // on SPARC we need to pass the original key since key expansion needs to happen in intrinsics due to
     // compatibility issues between Java key expansion and SPARC crypto instructions
     Node* original_k_start = get_original_key_start_from_aescrypt_object(aescrypt_object);
     if (original_k_start == NULL) return false;
     // Call the stub.
     make_runtime_call(RC_LEAF|RC_NO_FP, OptoRuntime::aescrypt_block_Type(),
                       stubAddr, stubName, TypePtr::BOTTOM,
                       src_start, dest_start, k_start, original_k_start);
   } else {
     // Call the stub.
     make_runtime_call(RC_LEAF|RC_NO_FP, OptoRuntime::aescrypt_block_Type(),
                       stubAddr, stubName, TypePtr::BOTTOM,
                       src_start, dest_start, k_start);
   }
   return true;
 }
 //------------------------------inline_cipherBlockChaining_AESCrypt-----------------------
 bool LibraryCallKit::inline_cipherBlockChaining_AESCrypt(vmIntrinsics::ID id) {
   address stubAddr;
   const char *stubName;
   assert(UseAES, "need AES instruction support");
   switch(id) {
   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
     stubAddr = StubRoutines::cipherBlockChaining_encryptAESCrypt();
     stubName = "cipherBlockChaining_encryptAESCrypt";
     break;
   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
     stubAddr = StubRoutines::cipherBlockChaining_decryptAESCrypt();
     stubName = "cipherBlockChaining_decryptAESCrypt";
     break;
   }
   if (stubAddr == NULL) return false;
   Node* cipherBlockChaining_object = argument(0);
   Node* src                        = argument(1);
   Node* src_offset                 = argument(2);
   Node* len                        = argument(3);
   Node* dest                       = argument(4);
   Node* dest_offset                = argument(5);
   // (1) src and dest are arrays.
   const Type* src_type = src->Value(&_gvn);
   const Type* dest_type = dest->Value(&_gvn);
   const TypeAryPtr* top_src = src_type->isa_aryptr();
   const TypeAryPtr* top_dest = dest_type->isa_aryptr();
   assert (top_src  != NULL && top_src->klass()  != NULL
           &&  top_dest != NULL && top_dest->klass() != NULL, "args are strange");
   // checks are the responsibility of the caller
   Node* src_start  = src;
   Node* dest_start = dest;
   if (src_offset != NULL || dest_offset != NULL) {
     assert(src_offset != NULL && dest_offset != NULL, "");
     src_start  = array_element_address(src,  src_offset,  T_BYTE);
     dest_start = array_element_address(dest, dest_offset, T_BYTE);
   }
   // if we are in this set of code, we "know" the embeddedCipher is an AESCrypt object
   // (because of the predicated logic executed earlier).
   // so we cast it here safely.
   // this requires a newer class file that has this array as littleEndian ints, otherwise we revert to java
   Node* embeddedCipherObj = load_field_from_object(cipherBlockChaining_object, "embeddedCipher", "Lcom/sun/crypto/provider/SymmetricCipher;", /*is_exact*/ false);
   if (embeddedCipherObj == NULL) return false;
   // cast it to what we know it will be at runtime
   const TypeInstPtr* tinst = _gvn.type(cipherBlockChaining_object)->isa_instptr();
   assert(tinst != NULL, "CBC obj is null");
   assert(tinst->klass()->is_loaded(), "CBC obj is not loaded");
   ciKlass* klass_AESCrypt = tinst->klass()->as_instance_klass()->find_klass(ciSymbol::make("com/sun/crypto/provider/AESCrypt"));
   if (!klass_AESCrypt->is_loaded()) return false;
   ciInstanceKlass* instklass_AESCrypt = klass_AESCrypt->as_instance_klass();
   const TypeKlassPtr* aklass = TypeKlassPtr::make(instklass_AESCrypt);
   const TypeOopPtr* xtype = aklass->as_instance_type();
   Node* aescrypt_object = new(C) CheckCastPPNode(control(), embeddedCipherObj, xtype);
   aescrypt_object = _gvn.transform(aescrypt_object);
   // we need to get the start of the aescrypt_object's expanded key array
   Node* k_start = get_key_start_from_aescrypt_object(aescrypt_object);
   if (k_start == NULL) return false;
   // similarly, get the start address of the r vector
   Node* objRvec = load_field_from_object(cipherBlockChaining_object, "r", "[B", /*is_exact*/ false);
   if (objRvec == NULL) return false;
   Node* r_start = array_element_address(objRvec, intcon(0), T_BYTE);
   Node* cbcCrypt;
   if (Matcher::pass_original_key_for_aes()) {
     // on SPARC we need to pass the original key since key expansion needs to happen in intrinsics due to
     // compatibility issues between Java key expansion and SPARC crypto instructions
     Node* original_k_start = get_original_key_start_from_aescrypt_object(aescrypt_object);
     if (original_k_start == NULL) return false;
     // Call the stub, passing src_start, dest_start, k_start, r_start, src_len and original_k_start
     cbcCrypt = make_runtime_call(RC_LEAF|RC_NO_FP,
                                  OptoRuntime::cipherBlockChaining_aescrypt_Type(),
                                  stubAddr, stubName, TypePtr::BOTTOM,
                                  src_start, dest_start, k_start, r_start, len, original_k_start);
   } else {
     // Call the stub, passing src_start, dest_start, k_start, r_start and src_len
     cbcCrypt = make_runtime_call(RC_LEAF|RC_NO_FP,
                                  OptoRuntime::cipherBlockChaining_aescrypt_Type(),
                                  stubAddr, stubName, TypePtr::BOTTOM,
                                  src_start, dest_start, k_start, r_start, len);
   }
   // return cipher length (int)
   Node* retvalue = _gvn.transform(new (C) ProjNode(cbcCrypt, TypeFunc::Parms));
   set_result(retvalue);
   return true;
 }
 //------------------------------get_key_start_from_aescrypt_object-----------------------
 Node * LibraryCallKit::get_key_start_from_aescrypt_object(Node *aescrypt_object) {
   Node* objAESCryptKey = load_field_from_object(aescrypt_object, "K", "[I", /*is_exact*/ false);
   assert (objAESCryptKey != NULL, "wrong version of com.sun.crypto.provider.AESCrypt");
   if (objAESCryptKey == NULL) return (Node *) NULL;
   // now have the array, need to get the start address of the K array
   Node* k_start = array_element_address(objAESCryptKey, intcon(0), T_INT);
   return k_start;
 }
 //------------------------------get_original_key_start_from_aescrypt_object-----------------------
 Node * LibraryCallKit::get_original_key_start_from_aescrypt_object(Node *aescrypt_object) {
   Node* objAESCryptKey = load_field_from_object(aescrypt_object, "lastKey", "[B", /*is_exact*/ false);
   assert (objAESCryptKey != NULL, "wrong version of com.sun.crypto.provider.AESCrypt");
   if (objAESCryptKey == NULL) return (Node *) NULL;
   // now have the array, need to get the start address of the lastKey array
   Node* original_k_start = array_element_address(objAESCryptKey, intcon(0), T_BYTE);
   return original_k_start;
 }
 //----------------------------inline_cipherBlockChaining_AESCrypt_predicate----------------------------
 // Return node representing slow path of predicate check.
 // the pseudo code we want to emulate with this predicate is:
 // for encryption:
 //    if (embeddedCipherObj instanceof AESCrypt) do_intrinsic, else do_javapath
 // for decryption:
 //    if ((embeddedCipherObj instanceof AESCrypt) && (cipher!=plain)) do_intrinsic, else do_javapath
 //    note cipher==plain is more conservative than the original java code but that's OK
 //
 Node* LibraryCallKit::inline_cipherBlockChaining_AESCrypt_predicate(bool decrypting) {
   // First, check receiver for NULL since it is virtual method.
   Node* objCBC = argument(0);
   objCBC = null_check(objCBC);
   if (stopped()) return NULL; // Always NULL
   // Load embeddedCipher field of CipherBlockChaining object.
   Node* embeddedCipherObj = load_field_from_object(objCBC, "embeddedCipher", "Lcom/sun/crypto/provider/SymmetricCipher;", /*is_exact*/ false);
   // get AESCrypt klass for instanceOf check
   // AESCrypt might not be loaded yet if some other SymmetricCipher got us to this compile point
   // will have same classloader as CipherBlockChaining object
   const TypeInstPtr* tinst = _gvn.type(objCBC)->isa_instptr();
   assert(tinst != NULL, "CBCobj is null");
   assert(tinst->klass()->is_loaded(), "CBCobj is not loaded");
   // we want to do an instanceof comparison against the AESCrypt class
   ciKlass* klass_AESCrypt = tinst->klass()->as_instance_klass()->find_klass(ciSymbol::make("com/sun/crypto/provider/AESCrypt"));
   if (!klass_AESCrypt->is_loaded()) {
     // if AESCrypt is not even loaded, we never take the intrinsic fast path
     Node* ctrl = control();
     set_control(top()); // no regular fast path
     return ctrl;
   }
   ciInstanceKlass* instklass_AESCrypt = klass_AESCrypt->as_instance_klass();
   Node* instof = gen_instanceof(embeddedCipherObj, makecon(TypeKlassPtr::make(instklass_AESCrypt)));
   Node* cmp_instof  = _gvn.transform(new (C) CmpINode(instof, intcon(1)));
   Node* bool_instof  = _gvn.transform(new (C) BoolNode(cmp_instof, BoolTest::ne));
   Node* instof_false = generate_guard(bool_instof, NULL, PROB_MIN);
   // for encryption, we are done
   if (!decrypting)
     return instof_false;  // even if it is NULL
   // for decryption, we need to add a further check to avoid
   // taking the intrinsic path when cipher and plain are the same
   // see the original java code for why.
   RegionNode* region = new(C) RegionNode(3);
   region->init_req(1, instof_false);
   Node* src = argument(1);
   Node* dest = argument(4);
   Node* cmp_src_dest = _gvn.transform(new (C) CmpPNode(src, dest));
   Node* bool_src_dest = _gvn.transform(new (C) BoolNode(cmp_src_dest, BoolTest::eq));
   Node* src_dest_conjoint = generate_guard(bool_src_dest, NULL, PROB_MIN);
   region->init_req(2, src_dest_conjoint);
   record_for_igvn(region);
   return _gvn.transform(region);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/library_call.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/library_call.cpp