jdk8-mips64-public/hotspot: src/cpu/x86/vm/c1_LIRGenerator

src/cpu/x86/vm/c1_LIRGenerator_x86.cpp@7ae4e26cb1e0 (annotated)

src/cpu/x86/vm/c1_LIRGenerator_x86.cpp

Thu, 12 Oct 2017 21:27:07 +0800

author: aoqi
date: Thu, 12 Oct 2017 21:27:07 +0800
changeset 7535: 7ae4e26cb1e0
parent 7058: 2fd0fd493045
parent 6876: 710a3c8b516e
child 8604: 04d83ba48607
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2005, 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 "c1/c1_Compilation.hpp"
 #include "c1/c1_FrameMap.hpp"
 #include "c1/c1_Instruction.hpp"
 #include "c1/c1_LIRAssembler.hpp"
 #include "c1/c1_LIRGenerator.hpp"
 #include "c1/c1_Runtime1.hpp"
 #include "c1/c1_ValueStack.hpp"
 #include "ci/ciArray.hpp"
 #include "ci/ciObjArrayKlass.hpp"
 #include "ci/ciTypeArrayKlass.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "vmreg_x86.inline.hpp"
 #ifdef ASSERT
 #define __ gen()->lir(__FILE__, __LINE__)->
 #else
 #define __ gen()->lir()->
 #endif
 // Item will be loaded into a byte register; Intel only
 void LIRItem::load_byte_item() {
   load_item();
   LIR_Opr res = result();
   if (!res->is_virtual() || !_gen->is_vreg_flag_set(res, LIRGenerator::byte_reg)) {
     // make sure that it is a byte register
     assert(!value()->type()->is_float() && !value()->type()->is_double(),
            "can't load floats in byte register");
     LIR_Opr reg = _gen->rlock_byte(T_BYTE);
     __ move(res, reg);
     _result = reg;
   }
 }
 void LIRItem::load_nonconstant() {
   LIR_Opr r = value()->operand();
   if (r->is_constant()) {
     _result = r;
   } else {
     load_item();
   }
 }
 //--------------------------------------------------------------
 //               LIRGenerator
 //--------------------------------------------------------------
 LIR_Opr LIRGenerator::exceptionOopOpr() { return FrameMap::rax_oop_opr; }
 LIR_Opr LIRGenerator::exceptionPcOpr()  { return FrameMap::rdx_opr; }
 LIR_Opr LIRGenerator::divInOpr()        { return FrameMap::rax_opr; }
 LIR_Opr LIRGenerator::divOutOpr()       { return FrameMap::rax_opr; }
 LIR_Opr LIRGenerator::remOutOpr()       { return FrameMap::rdx_opr; }
 LIR_Opr LIRGenerator::shiftCountOpr()   { return FrameMap::rcx_opr; }
 LIR_Opr LIRGenerator::syncTempOpr()     { return FrameMap::rax_opr; }
 LIR_Opr LIRGenerator::getThreadTemp()   { return LIR_OprFact::illegalOpr; }
 LIR_Opr LIRGenerator::result_register_for(ValueType* type, bool callee) {
   LIR_Opr opr;
   switch (type->tag()) {
     case intTag:     opr = FrameMap::rax_opr;          break;
     case objectTag:  opr = FrameMap::rax_oop_opr;      break;
     case longTag:    opr = FrameMap::long0_opr;        break;
     case floatTag:   opr = UseSSE >= 1 ? FrameMap::xmm0_float_opr  : FrameMap::fpu0_float_opr;  break;
     case doubleTag:  opr = UseSSE >= 2 ? FrameMap::xmm0_double_opr : FrameMap::fpu0_double_opr;  break;
     case addressTag:
     default: ShouldNotReachHere(); return LIR_OprFact::illegalOpr;
   }
   assert(opr->type_field() == as_OprType(as_BasicType(type)), "type mismatch");
   return opr;
 }
 LIR_Opr LIRGenerator::rlock_byte(BasicType type) {
   LIR_Opr reg = new_register(T_INT);
   set_vreg_flag(reg, LIRGenerator::byte_reg);
   return reg;
 }
 //--------- loading items into registers --------------------------------
 // i486 instructions can inline constants
 bool LIRGenerator::can_store_as_constant(Value v, BasicType type) const {
   if (type == T_SHORT || type == T_CHAR) {
     // there is no immediate move of word values in asembler_i486.?pp
     return false;
   }
   Constant* c = v->as_Constant();
   if (c && c->state_before() == NULL) {
     // constants of any type can be stored directly, except for
     // unloaded object constants.
     return true;
   }
   return false;
 }
 bool LIRGenerator::can_inline_as_constant(Value v) const {
   if (v->type()->tag() == longTag) return false;
   return v->type()->tag() != objectTag ||
     (v->type()->is_constant() && v->type()->as_ObjectType()->constant_value()->is_null_object());
 }
 bool LIRGenerator::can_inline_as_constant(LIR_Const* c) const {
   if (c->type() == T_LONG) return false;
   return c->type() != T_OBJECT || c->as_jobject() == NULL;
 }
 LIR_Opr LIRGenerator::safepoint_poll_register() {
   return LIR_OprFact::illegalOpr;
 }
 LIR_Address* LIRGenerator::generate_address(LIR_Opr base, LIR_Opr index,
                                             int shift, int disp, BasicType type) {
   assert(base->is_register(), "must be");
   if (index->is_constant()) {
     return new LIR_Address(base,
                            (index->as_constant_ptr()->as_jint() << shift) + disp,
                            type);
   } else {
     return new LIR_Address(base, index, (LIR_Address::Scale)shift, disp, type);
   }
 }
 LIR_Address* LIRGenerator::emit_array_address(LIR_Opr array_opr, LIR_Opr index_opr,
                                               BasicType type, bool needs_card_mark) {
   int offset_in_bytes = arrayOopDesc::base_offset_in_bytes(type);
   LIR_Address* addr;
   if (index_opr->is_constant()) {
     int elem_size = type2aelembytes(type);
     addr = new LIR_Address(array_opr,
                            offset_in_bytes + index_opr->as_jint() * elem_size, type);
   } else {
 #ifdef _LP64
     if (index_opr->type() == T_INT) {
       LIR_Opr tmp = new_register(T_LONG);
       __ convert(Bytecodes::_i2l, index_opr, tmp);
       index_opr = tmp;
     }
 #endif // _LP64
     addr =  new LIR_Address(array_opr,
                             index_opr,
                             LIR_Address::scale(type),
                             offset_in_bytes, type);
   }
   if (needs_card_mark) {
     // This store will need a precise card mark, so go ahead and
     // compute the full adddres instead of computing once for the
     // store and again for the card mark.
     LIR_Opr tmp = new_pointer_register();
     __ leal(LIR_OprFact::address(addr), tmp);
     return new LIR_Address(tmp, type);
   } else {
     return addr;
   }
 }
 LIR_Opr LIRGenerator::load_immediate(int x, BasicType type) {
   LIR_Opr r;
   if (type == T_LONG) {
     r = LIR_OprFact::longConst(x);
   } else if (type == T_INT) {
     r = LIR_OprFact::intConst(x);
   } else {
     ShouldNotReachHere();
   }
   return r;
 }
 void LIRGenerator::increment_counter(address counter, BasicType type, int step) {
   LIR_Opr pointer = new_pointer_register();
   __ move(LIR_OprFact::intptrConst(counter), pointer);
   LIR_Address* addr = new LIR_Address(pointer, type);
   increment_counter(addr, step);
 }
 void LIRGenerator::increment_counter(LIR_Address* addr, int step) {
   __ add((LIR_Opr)addr, LIR_OprFact::intConst(step), (LIR_Opr)addr);
 }
 void LIRGenerator::cmp_mem_int(LIR_Condition condition, LIR_Opr base, int disp, int c, CodeEmitInfo* info) {
   __ cmp_mem_int(condition, base, disp, c, info);
 }
 void LIRGenerator::cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Opr base, int disp, BasicType type, CodeEmitInfo* info) {
   __ cmp_reg_mem(condition, reg, new LIR_Address(base, disp, type), info);
 }
 void LIRGenerator::cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Opr base, LIR_Opr disp, BasicType type, CodeEmitInfo* info) {
   __ cmp_reg_mem(condition, reg, new LIR_Address(base, disp, type), info);
 }
 bool LIRGenerator::strength_reduce_multiply(LIR_Opr left, int c, LIR_Opr result, LIR_Opr tmp) {
   if (tmp->is_valid()) {
     if (is_power_of_2(c + 1)) {
       __ move(left, tmp);
       __ shift_left(left, log2_intptr(c + 1), left);
       __ sub(left, tmp, result);
       return true;
     } else if (is_power_of_2(c - 1)) {
       __ move(left, tmp);
       __ shift_left(left, log2_intptr(c - 1), left);
       __ add(left, tmp, result);
       return true;
     }
   }
   return false;
 }
 void LIRGenerator::store_stack_parameter (LIR_Opr item, ByteSize offset_from_sp) {
   BasicType type = item->type();
   __ store(item, new LIR_Address(FrameMap::rsp_opr, in_bytes(offset_from_sp), type));
 }
 //----------------------------------------------------------------------
 //             visitor functions
 //----------------------------------------------------------------------
 void LIRGenerator::do_StoreIndexed(StoreIndexed* x) {
   assert(x->is_pinned(),"");
   bool needs_range_check = x->compute_needs_range_check();
   bool use_length = x->length() != NULL;
   bool obj_store = x->elt_type() == T_ARRAY || x->elt_type() == T_OBJECT;
   bool needs_store_check = obj_store && (x->value()->as_Constant() == NULL ||
                                          !get_jobject_constant(x->value())->is_null_object() ||
                                          x->should_profile());
   LIRItem array(x->array(), this);
   LIRItem index(x->index(), this);
   LIRItem value(x->value(), this);
   LIRItem length(this);
   array.load_item();
   index.load_nonconstant();
   if (use_length && needs_range_check) {
     length.set_instruction(x->length());
     length.load_item();
   }
   if (needs_store_check) {
     value.load_item();
   } else {
     value.load_for_store(x->elt_type());
   }
   set_no_result(x);
   // the CodeEmitInfo must be duplicated for each different
   // LIR-instruction because spilling can occur anywhere between two
   // instructions and so the debug information must be different
   CodeEmitInfo* range_check_info = state_for(x);
   CodeEmitInfo* null_check_info = NULL;
   if (x->needs_null_check()) {
     null_check_info = new CodeEmitInfo(range_check_info);
   }
   // emit array address setup early so it schedules better
   LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), obj_store);
   if (GenerateRangeChecks && needs_range_check) {
     if (use_length) {
       __ cmp(lir_cond_belowEqual, length.result(), index.result());
       __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result()));
     } else {
       array_range_check(array.result(), index.result(), null_check_info, range_check_info);
       // range_check also does the null check
       null_check_info = NULL;
     }
   }
   if (GenerateArrayStoreCheck && needs_store_check) {
     LIR_Opr tmp1 = new_register(objectType);
     LIR_Opr tmp2 = new_register(objectType);
     LIR_Opr tmp3 = new_register(objectType);
     CodeEmitInfo* store_check_info = new CodeEmitInfo(range_check_info);
     __ store_check(value.result(), array.result(), tmp1, tmp2, tmp3, store_check_info, x->profiled_method(), x->profiled_bci());
   }
   if (obj_store) {
     // Needs GC write barriers.
     pre_barrier(LIR_OprFact::address(array_addr), LIR_OprFact::illegalOpr /* pre_val */,
                 true /* do_load */, false /* patch */, NULL);
     __ move(value.result(), array_addr, null_check_info);
     // Seems to be a precise
     post_barrier(LIR_OprFact::address(array_addr), value.result());
   } else {
     __ move(value.result(), array_addr, null_check_info);
   }
 }
 void LIRGenerator::do_MonitorEnter(MonitorEnter* x) {
   assert(x->is_pinned(),"");
   LIRItem obj(x->obj(), this);
   obj.load_item();
   set_no_result(x);
   // "lock" stores the address of the monitor stack slot, so this is not an oop
   LIR_Opr lock = new_register(T_INT);
   // Need a scratch register for biased locking on x86
   LIR_Opr scratch = LIR_OprFact::illegalOpr;
   if (UseBiasedLocking) {
     scratch = new_register(T_INT);
   }
   CodeEmitInfo* info_for_exception = NULL;
   if (x->needs_null_check()) {
     info_for_exception = state_for(x);
   }
   // this CodeEmitInfo must not have the xhandlers because here the
   // object is already locked (xhandlers expect object to be unlocked)
   CodeEmitInfo* info = state_for(x, x->state(), true);
   monitor_enter(obj.result(), lock, syncTempOpr(), scratch,
                         x->monitor_no(), info_for_exception, info);
 }
 void LIRGenerator::do_MonitorExit(MonitorExit* x) {
   assert(x->is_pinned(),"");
   LIRItem obj(x->obj(), this);
   obj.dont_load_item();
   LIR_Opr lock = new_register(T_INT);
   LIR_Opr obj_temp = new_register(T_INT);
   set_no_result(x);
   monitor_exit(obj_temp, lock, syncTempOpr(), LIR_OprFact::illegalOpr, x->monitor_no());
 }
 // _ineg, _lneg, _fneg, _dneg
 void LIRGenerator::do_NegateOp(NegateOp* x) {
   LIRItem value(x->x(), this);
   value.set_destroys_register();
   value.load_item();
   LIR_Opr reg = rlock(x);
   __ negate(value.result(), reg);
   set_result(x, round_item(reg));
 }
 // for  _fadd, _fmul, _fsub, _fdiv, _frem
 //      _dadd, _dmul, _dsub, _ddiv, _drem
 void LIRGenerator::do_ArithmeticOp_FPU(ArithmeticOp* x) {
   LIRItem left(x->x(),  this);
   LIRItem right(x->y(), this);
   LIRItem* left_arg  = &left;
   LIRItem* right_arg = &right;
   assert(!left.is_stack() || !right.is_stack(), "can't both be memory operands");
   bool must_load_both = (x->op() == Bytecodes::_frem || x->op() == Bytecodes::_drem);
   if (left.is_register() || x->x()->type()->is_constant() || must_load_both) {
     left.load_item();
   } else {
     left.dont_load_item();
   }
   // do not load right operand if it is a constant.  only 0 and 1 are
   // loaded because there are special instructions for loading them
   // without memory access (not needed for SSE2 instructions)
   bool must_load_right = false;
   if (right.is_constant()) {
     LIR_Const* c = right.result()->as_constant_ptr();
     assert(c != NULL, "invalid constant");
     assert(c->type() == T_FLOAT || c->type() == T_DOUBLE, "invalid type");
     if (c->type() == T_FLOAT) {
       must_load_right = UseSSE < 1 && (c->is_one_float() || c->is_zero_float());
     } else {
       must_load_right = UseSSE < 2 && (c->is_one_double() || c->is_zero_double());
     }
   }
   if (must_load_both) {
     // frem and drem destroy also right operand, so move it to a new register
     right.set_destroys_register();
     right.load_item();
   } else if (right.is_register() || must_load_right) {
     right.load_item();
   } else {
     right.dont_load_item();
   }
   LIR_Opr reg = rlock(x);
   LIR_Opr tmp = LIR_OprFact::illegalOpr;
   if (x->is_strictfp() && (x->op() == Bytecodes::_dmul || x->op() == Bytecodes::_ddiv)) {
     tmp = new_register(T_DOUBLE);
   }
   if ((UseSSE >= 1 && x->op() == Bytecodes::_frem) || (UseSSE >= 2 && x->op() == Bytecodes::_drem)) {
     // special handling for frem and drem: no SSE instruction, so must use FPU with temporary fpu stack slots
     LIR_Opr fpu0, fpu1;
     if (x->op() == Bytecodes::_frem) {
       fpu0 = LIR_OprFact::single_fpu(0);
       fpu1 = LIR_OprFact::single_fpu(1);
     } else {
       fpu0 = LIR_OprFact::double_fpu(0);
       fpu1 = LIR_OprFact::double_fpu(1);
     }
     __ move(right.result(), fpu1); // order of left and right operand is important!
     __ move(left.result(), fpu0);
     __ rem (fpu0, fpu1, fpu0);
     __ move(fpu0, reg);
   } else {
     arithmetic_op_fpu(x->op(), reg, left.result(), right.result(), x->is_strictfp(), tmp);
   }
   set_result(x, round_item(reg));
 }
 // for  _ladd, _lmul, _lsub, _ldiv, _lrem
 void LIRGenerator::do_ArithmeticOp_Long(ArithmeticOp* x) {
   if (x->op() == Bytecodes::_ldiv || x->op() == Bytecodes::_lrem ) {
     // long division is implemented as a direct call into the runtime
     LIRItem left(x->x(), this);
     LIRItem right(x->y(), this);
     // the check for division by zero destroys the right operand
     right.set_destroys_register();
     BasicTypeList signature(2);
     signature.append(T_LONG);
     signature.append(T_LONG);
     CallingConvention* cc = frame_map()->c_calling_convention(&signature);
     // check for division by zero (destroys registers of right operand!)
     CodeEmitInfo* info = state_for(x);
     const LIR_Opr result_reg = result_register_for(x->type());
     left.load_item_force(cc->at(1));
     right.load_item();
     __ move(right.result(), cc->at(0));
     __ cmp(lir_cond_equal, right.result(), LIR_OprFact::longConst(0));
     __ branch(lir_cond_equal, T_LONG, new DivByZeroStub(info));
     address entry;
     switch (x->op()) {
     case Bytecodes::_lrem:
       entry = CAST_FROM_FN_PTR(address, SharedRuntime::lrem);
       break; // check if dividend is 0 is done elsewhere
     case Bytecodes::_ldiv:
       entry = CAST_FROM_FN_PTR(address, SharedRuntime::ldiv);
       break; // check if dividend is 0 is done elsewhere
     case Bytecodes::_lmul:
       entry = CAST_FROM_FN_PTR(address, SharedRuntime::lmul);
       break;
     default:
       ShouldNotReachHere();
     }
     LIR_Opr result = rlock_result(x);
     __ call_runtime_leaf(entry, getThreadTemp(), result_reg, cc->args());
     __ move(result_reg, result);
   } else if (x->op() == Bytecodes::_lmul) {
     // missing test if instr is commutative and if we should swap
     LIRItem left(x->x(), this);
     LIRItem right(x->y(), this);
     // right register is destroyed by the long mul, so it must be
     // copied to a new register.
     right.set_destroys_register();
     left.load_item();
     right.load_item();
     LIR_Opr reg = FrameMap::long0_opr;
     arithmetic_op_long(x->op(), reg, left.result(), right.result(), NULL);
     LIR_Opr result = rlock_result(x);
     __ move(reg, result);
   } else {
     // missing test if instr is commutative and if we should swap
     LIRItem left(x->x(), this);
     LIRItem right(x->y(), this);
     left.load_item();
     // don't load constants to save register
     right.load_nonconstant();
     rlock_result(x);
     arithmetic_op_long(x->op(), x->operand(), left.result(), right.result(), NULL);
   }
 }
 // for: _iadd, _imul, _isub, _idiv, _irem
 void LIRGenerator::do_ArithmeticOp_Int(ArithmeticOp* x) {
   if (x->op() == Bytecodes::_idiv || x->op() == Bytecodes::_irem) {
     // The requirements for division and modulo
     // input : rax,: dividend                         min_int
     //         reg: divisor   (may not be rax,/rdx)   -1
     //
     // output: rax,: quotient  (= rax, idiv reg)       min_int
     //         rdx: remainder (= rax, irem reg)       0
     // rax, and rdx will be destroyed
     // Note: does this invalidate the spec ???
     LIRItem right(x->y(), this);
     LIRItem left(x->x() , this);   // visit left second, so that the is_register test is valid
     // call state_for before load_item_force because state_for may
     // force the evaluation of other instructions that are needed for
     // correct debug info.  Otherwise the live range of the fix
     // register might be too long.
     CodeEmitInfo* info = state_for(x);
     left.load_item_force(divInOpr());
     right.load_item();
     LIR_Opr result = rlock_result(x);
     LIR_Opr result_reg;
     if (x->op() == Bytecodes::_idiv) {
       result_reg = divOutOpr();
     } else {
       result_reg = remOutOpr();
     }
     if (!ImplicitDiv0Checks) {
       __ cmp(lir_cond_equal, right.result(), LIR_OprFact::intConst(0));
       __ branch(lir_cond_equal, T_INT, new DivByZeroStub(info));
     }
     LIR_Opr tmp = FrameMap::rdx_opr; // idiv and irem use rdx in their implementation
     if (x->op() == Bytecodes::_irem) {
       __ irem(left.result(), right.result(), result_reg, tmp, info);
     } else if (x->op() == Bytecodes::_idiv) {
       __ idiv(left.result(), right.result(), result_reg, tmp, info);
     } else {
       ShouldNotReachHere();
     }
     __ move(result_reg, result);
   } else {
     // missing test if instr is commutative and if we should swap
     LIRItem left(x->x(),  this);
     LIRItem right(x->y(), this);
     LIRItem* left_arg = &left;
     LIRItem* right_arg = &right;
     if (x->is_commutative() && left.is_stack() && right.is_register()) {
       // swap them if left is real stack (or cached) and right is real register(not cached)
       left_arg = &right;
       right_arg = &left;
     }
     left_arg->load_item();
     // do not need to load right, as we can handle stack and constants
     if (x->op() == Bytecodes::_imul ) {
       // check if we can use shift instead
       bool use_constant = false;
       bool use_tmp = false;
       if (right_arg->is_constant()) {
         int iconst = right_arg->get_jint_constant();
         if (iconst > 0) {
           if (is_power_of_2(iconst)) {
             use_constant = true;
           } else if (is_power_of_2(iconst - 1) || is_power_of_2(iconst + 1)) {
             use_constant = true;
             use_tmp = true;
           }
         }
       }
       if (use_constant) {
         right_arg->dont_load_item();
       } else {
         right_arg->load_item();
       }
       LIR_Opr tmp = LIR_OprFact::illegalOpr;
       if (use_tmp) {
         tmp = new_register(T_INT);
       }
       rlock_result(x);
       arithmetic_op_int(x->op(), x->operand(), left_arg->result(), right_arg->result(), tmp);
     } else {
       right_arg->dont_load_item();
       rlock_result(x);
       LIR_Opr tmp = LIR_OprFact::illegalOpr;
       arithmetic_op_int(x->op(), x->operand(), left_arg->result(), right_arg->result(), tmp);
     }
   }
 }
 void LIRGenerator::do_ArithmeticOp(ArithmeticOp* x) {
   // when an operand with use count 1 is the left operand, then it is
   // likely that no move for 2-operand-LIR-form is necessary
   if (x->is_commutative() && x->y()->as_Constant() == NULL && x->x()->use_count() > x->y()->use_count()) {
     x->swap_operands();
   }
   ValueTag tag = x->type()->tag();
   assert(x->x()->type()->tag() == tag && x->y()->type()->tag() == tag, "wrong parameters");
   switch (tag) {
     case floatTag:
     case doubleTag:  do_ArithmeticOp_FPU(x);  return;
     case longTag:    do_ArithmeticOp_Long(x); return;
     case intTag:     do_ArithmeticOp_Int(x);  return;
   }
   ShouldNotReachHere();
 }
 // _ishl, _lshl, _ishr, _lshr, _iushr, _lushr
 void LIRGenerator::do_ShiftOp(ShiftOp* x) {
   // count must always be in rcx
   LIRItem value(x->x(), this);
   LIRItem count(x->y(), this);
   ValueTag elemType = x->type()->tag();
   bool must_load_count = !count.is_constant() || elemType == longTag;
   if (must_load_count) {
     // count for long must be in register
     count.load_item_force(shiftCountOpr());
   } else {
     count.dont_load_item();
   }
   value.load_item();
   LIR_Opr reg = rlock_result(x);
   shift_op(x->op(), reg, value.result(), count.result(), LIR_OprFact::illegalOpr);
 }
 // _iand, _land, _ior, _lor, _ixor, _lxor
 void LIRGenerator::do_LogicOp(LogicOp* x) {
   // when an operand with use count 1 is the left operand, then it is
   // likely that no move for 2-operand-LIR-form is necessary
   if (x->is_commutative() && x->y()->as_Constant() == NULL && x->x()->use_count() > x->y()->use_count()) {
     x->swap_operands();
   }
   LIRItem left(x->x(), this);
   LIRItem right(x->y(), this);
   left.load_item();
   right.load_nonconstant();
   LIR_Opr reg = rlock_result(x);
   logic_op(x->op(), reg, left.result(), right.result());
 }
 // _lcmp, _fcmpl, _fcmpg, _dcmpl, _dcmpg
 void LIRGenerator::do_CompareOp(CompareOp* x) {
   LIRItem left(x->x(), this);
   LIRItem right(x->y(), this);
   ValueTag tag = x->x()->type()->tag();
   if (tag == longTag) {
     left.set_destroys_register();
   }
   left.load_item();
   right.load_item();
   LIR_Opr reg = rlock_result(x);
   if (x->x()->type()->is_float_kind()) {
     Bytecodes::Code code = x->op();
     __ fcmp2int(left.result(), right.result(), reg, (code == Bytecodes::_fcmpl || code == Bytecodes::_dcmpl));
   } else if (x->x()->type()->tag() == longTag) {
     __ lcmp2int(left.result(), right.result(), reg);
   } else {
     Unimplemented();
   }
 }
 void LIRGenerator::do_CompareAndSwap(Intrinsic* x, ValueType* type) {
   assert(x->number_of_arguments() == 4, "wrong type");
   LIRItem obj   (x->argument_at(0), this);  // object
   LIRItem offset(x->argument_at(1), this);  // offset of field
   LIRItem cmp   (x->argument_at(2), this);  // value to compare with field
   LIRItem val   (x->argument_at(3), this);  // replace field with val if matches cmp
   assert(obj.type()->tag() == objectTag, "invalid type");
   // In 64bit the type can be long, sparc doesn't have this assert
   // assert(offset.type()->tag() == intTag, "invalid type");
   assert(cmp.type()->tag() == type->tag(), "invalid type");
   assert(val.type()->tag() == type->tag(), "invalid type");
   // get address of field
   obj.load_item();
   offset.load_nonconstant();
   if (type == objectType) {
     cmp.load_item_force(FrameMap::rax_oop_opr);
     val.load_item();
   } else if (type == intType) {
     cmp.load_item_force(FrameMap::rax_opr);
     val.load_item();
   } else if (type == longType) {
     cmp.load_item_force(FrameMap::long0_opr);
     val.load_item_force(FrameMap::long1_opr);
   } else {
     ShouldNotReachHere();
   }
   LIR_Opr addr = new_pointer_register();
   LIR_Address* a;
   if(offset.result()->is_constant()) {
 #ifdef _LP64
     jlong c = offset.result()->as_jlong();
     if ((jlong)((jint)c) == c) {
       a = new LIR_Address(obj.result(),
                           (jint)c,
                           as_BasicType(type));
     } else {
       LIR_Opr tmp = new_register(T_LONG);
       __ move(offset.result(), tmp);
       a = new LIR_Address(obj.result(),
                           tmp,
                           as_BasicType(type));
     }
 #else
     a = new LIR_Address(obj.result(),
                         offset.result()->as_jint(),
                         as_BasicType(type));
 #endif
   } else {
     a = new LIR_Address(obj.result(),
                         offset.result(),
                         LIR_Address::times_1,
 ,
                         as_BasicType(type));
   }
   __ leal(LIR_OprFact::address(a), addr);
   if (type == objectType) {  // Write-barrier needed for Object fields.
     // Do the pre-write barrier, if any.
     pre_barrier(addr, LIR_OprFact::illegalOpr /* pre_val */,
                 true /* do_load */, false /* patch */, NULL);
   }
   LIR_Opr ill = LIR_OprFact::illegalOpr;  // for convenience
   if (type == objectType)
     __ cas_obj(addr, cmp.result(), val.result(), ill, ill);
   else if (type == intType)
     __ cas_int(addr, cmp.result(), val.result(), ill, ill);
   else if (type == longType)
     __ cas_long(addr, cmp.result(), val.result(), ill, ill);
   else {
     ShouldNotReachHere();
   }
   // generate conditional move of boolean result
   LIR_Opr result = rlock_result(x);
   __ cmove(lir_cond_equal, LIR_OprFact::intConst(1), LIR_OprFact::intConst(0),
            result, as_BasicType(type));
   if (type == objectType) {   // Write-barrier needed for Object fields.
     // Seems to be precise
     post_barrier(addr, val.result());
   }
 }
 void LIRGenerator::do_MathIntrinsic(Intrinsic* x) {
   assert(x->number_of_arguments() == 1 || (x->number_of_arguments() == 2 && x->id() == vmIntrinsics::_dpow), "wrong type");
   LIRItem value(x->argument_at(0), this);
   bool use_fpu = false;
   if (UseSSE >= 2) {
     switch(x->id()) {
       case vmIntrinsics::_dsin:
       case vmIntrinsics::_dcos:
       case vmIntrinsics::_dtan:
       case vmIntrinsics::_dlog:
       case vmIntrinsics::_dlog10:
       case vmIntrinsics::_dexp:
       case vmIntrinsics::_dpow:
         use_fpu = true;
     }
   } else {
     value.set_destroys_register();
   }
   value.load_item();
   LIR_Opr calc_input = value.result();
   LIR_Opr calc_input2 = NULL;
   if (x->id() == vmIntrinsics::_dpow) {
     LIRItem extra_arg(x->argument_at(1), this);
     if (UseSSE < 2) {
       extra_arg.set_destroys_register();
     }
     extra_arg.load_item();
     calc_input2 = extra_arg.result();
   }
   LIR_Opr calc_result = rlock_result(x);
   // sin, cos, pow and exp need two free fpu stack slots, so register
   // two temporary operands
   LIR_Opr tmp1 = FrameMap::caller_save_fpu_reg_at(0);
   LIR_Opr tmp2 = FrameMap::caller_save_fpu_reg_at(1);
   if (use_fpu) {
     LIR_Opr tmp = FrameMap::fpu0_double_opr;
     int tmp_start = 1;
     if (calc_input2 != NULL) {
       __ move(calc_input2, tmp);
       tmp_start = 2;
       calc_input2 = tmp;
     }
     __ move(calc_input, tmp);
     calc_input = tmp;
     calc_result = tmp;
     tmp1 = FrameMap::caller_save_fpu_reg_at(tmp_start);
     tmp2 = FrameMap::caller_save_fpu_reg_at(tmp_start + 1);
   }
   switch(x->id()) {
     case vmIntrinsics::_dabs:   __ abs  (calc_input, calc_result, LIR_OprFact::illegalOpr); break;
     case vmIntrinsics::_dsqrt:  __ sqrt (calc_input, calc_result, LIR_OprFact::illegalOpr); break;
     case vmIntrinsics::_dsin:   __ sin  (calc_input, calc_result, tmp1, tmp2);              break;
     case vmIntrinsics::_dcos:   __ cos  (calc_input, calc_result, tmp1, tmp2);              break;
     case vmIntrinsics::_dtan:   __ tan  (calc_input, calc_result, tmp1, tmp2);              break;
     case vmIntrinsics::_dlog:   __ log  (calc_input, calc_result, tmp1);                    break;
     case vmIntrinsics::_dlog10: __ log10(calc_input, calc_result, tmp1);                    break;
     case vmIntrinsics::_dexp:   __ exp  (calc_input, calc_result,              tmp1, tmp2, FrameMap::rax_opr, FrameMap::rcx_opr, FrameMap::rdx_opr); break;
     case vmIntrinsics::_dpow:   __ pow  (calc_input, calc_input2, calc_result, tmp1, tmp2, FrameMap::rax_opr, FrameMap::rcx_opr, FrameMap::rdx_opr); break;
     default:                    ShouldNotReachHere();
   }
   if (use_fpu) {
     __ move(calc_result, x->operand());
   }
 }
 void LIRGenerator::do_ArrayCopy(Intrinsic* x) {
   assert(x->number_of_arguments() == 5, "wrong type");
   // Make all state_for calls early since they can emit code
   CodeEmitInfo* info = state_for(x, x->state());
   LIRItem src(x->argument_at(0), this);
   LIRItem src_pos(x->argument_at(1), this);
   LIRItem dst(x->argument_at(2), this);
   LIRItem dst_pos(x->argument_at(3), this);
   LIRItem length(x->argument_at(4), this);
   // operands for arraycopy must use fixed registers, otherwise
   // LinearScan will fail allocation (because arraycopy always needs a
   // call)
 #ifndef _LP64
   src.load_item_force     (FrameMap::rcx_oop_opr);
   src_pos.load_item_force (FrameMap::rdx_opr);
   dst.load_item_force     (FrameMap::rax_oop_opr);
   dst_pos.load_item_force (FrameMap::rbx_opr);
   length.load_item_force  (FrameMap::rdi_opr);
   LIR_Opr tmp =           (FrameMap::rsi_opr);
 #else
   // The java calling convention will give us enough registers
   // so that on the stub side the args will be perfect already.
   // On the other slow/special case side we call C and the arg
   // positions are not similar enough to pick one as the best.
   // Also because the java calling convention is a "shifted" version
   // of the C convention we can process the java args trivially into C
   // args without worry of overwriting during the xfer
   src.load_item_force     (FrameMap::as_oop_opr(j_rarg0));
   src_pos.load_item_force (FrameMap::as_opr(j_rarg1));
   dst.load_item_force     (FrameMap::as_oop_opr(j_rarg2));
   dst_pos.load_item_force (FrameMap::as_opr(j_rarg3));
   length.load_item_force  (FrameMap::as_opr(j_rarg4));
   LIR_Opr tmp =           FrameMap::as_opr(j_rarg5);
 #endif // LP64
   set_no_result(x);
   int flags;
   ciArrayKlass* expected_type;
   arraycopy_helper(x, &flags, &expected_type);
   __ arraycopy(src.result(), src_pos.result(), dst.result(), dst_pos.result(), length.result(), tmp, expected_type, flags, info); // does add_safepoint
 }
 void LIRGenerator::do_update_CRC32(Intrinsic* x) {
   assert(UseCRC32Intrinsics, "need AVX and LCMUL instructions support");
   // Make all state_for calls early since they can emit code
   LIR_Opr result = rlock_result(x);
   int flags = 0;
   switch (x->id()) {
     case vmIntrinsics::_updateCRC32: {
       LIRItem crc(x->argument_at(0), this);
       LIRItem val(x->argument_at(1), this);
       // val is destroyed by update_crc32
       val.set_destroys_register();
       crc.load_item();
       val.load_item();
       __ update_crc32(crc.result(), val.result(), result);
       break;
     }
     case vmIntrinsics::_updateBytesCRC32:
     case vmIntrinsics::_updateByteBufferCRC32: {
       bool is_updateBytes = (x->id() == vmIntrinsics::_updateBytesCRC32);
       LIRItem crc(x->argument_at(0), this);
       LIRItem buf(x->argument_at(1), this);
       LIRItem off(x->argument_at(2), this);
       LIRItem len(x->argument_at(3), this);
       buf.load_item();
       off.load_nonconstant();
       LIR_Opr index = off.result();
       int offset = is_updateBytes ? arrayOopDesc::base_offset_in_bytes(T_BYTE) : 0;
       if(off.result()->is_constant()) {
         index = LIR_OprFact::illegalOpr;
        offset += off.result()->as_jint();
       }
       LIR_Opr base_op = buf.result();
 #ifndef _LP64
       if (!is_updateBytes) { // long b raw address
          base_op = new_register(T_INT);
          __ convert(Bytecodes::_l2i, buf.result(), base_op);
       }
 #else
       if (index->is_valid()) {
         LIR_Opr tmp = new_register(T_LONG);
         __ convert(Bytecodes::_i2l, index, tmp);
         index = tmp;
       }
 #endif
       LIR_Address* a = new LIR_Address(base_op,
                                        index,
                                        LIR_Address::times_1,
                                        offset,
                                        T_BYTE);
       BasicTypeList signature(3);
       signature.append(T_INT);
       signature.append(T_ADDRESS);
       signature.append(T_INT);
       CallingConvention* cc = frame_map()->c_calling_convention(&signature);
       const LIR_Opr result_reg = result_register_for(x->type());
       LIR_Opr addr = new_pointer_register();
       __ leal(LIR_OprFact::address(a), addr);
       crc.load_item_force(cc->at(0));
       __ move(addr, cc->at(1));
       len.load_item_force(cc->at(2));
       __ call_runtime_leaf(StubRoutines::updateBytesCRC32(), getThreadTemp(), result_reg, cc->args());
       __ move(result_reg, result);
       break;
     }
     default: {
       ShouldNotReachHere();
     }
   }
 }
 // _i2l, _i2f, _i2d, _l2i, _l2f, _l2d, _f2i, _f2l, _f2d, _d2i, _d2l, _d2f
 // _i2b, _i2c, _i2s
 LIR_Opr fixed_register_for(BasicType type) {
   switch (type) {
     case T_FLOAT:  return FrameMap::fpu0_float_opr;
     case T_DOUBLE: return FrameMap::fpu0_double_opr;
     case T_INT:    return FrameMap::rax_opr;
     case T_LONG:   return FrameMap::long0_opr;
     default:       ShouldNotReachHere(); return LIR_OprFact::illegalOpr;
   }
 }
 void LIRGenerator::do_Convert(Convert* x) {
   // flags that vary for the different operations and different SSE-settings
   bool fixed_input, fixed_result, round_result, needs_stub;
   switch (x->op()) {
     case Bytecodes::_i2l: // fall through
     case Bytecodes::_l2i: // fall through
     case Bytecodes::_i2b: // fall through
     case Bytecodes::_i2c: // fall through
     case Bytecodes::_i2s: fixed_input = false;       fixed_result = false;       round_result = false;      needs_stub = false; break;
     case Bytecodes::_f2d: fixed_input = UseSSE == 1; fixed_result = false;       round_result = false;      needs_stub = false; break;
     case Bytecodes::_d2f: fixed_input = false;       fixed_result = UseSSE == 1; round_result = UseSSE < 1; needs_stub = false; break;
     case Bytecodes::_i2f: fixed_input = false;       fixed_result = false;       round_result = UseSSE < 1; needs_stub = false; break;
     case Bytecodes::_i2d: fixed_input = false;       fixed_result = false;       round_result = false;      needs_stub = false; break;
     case Bytecodes::_f2i: fixed_input = false;       fixed_result = false;       round_result = false;      needs_stub = true;  break;
     case Bytecodes::_d2i: fixed_input = false;       fixed_result = false;       round_result = false;      needs_stub = true;  break;
     case Bytecodes::_l2f: fixed_input = false;       fixed_result = UseSSE >= 1; round_result = UseSSE < 1; needs_stub = false; break;
     case Bytecodes::_l2d: fixed_input = false;       fixed_result = UseSSE >= 2; round_result = UseSSE < 2; needs_stub = false; break;
     case Bytecodes::_f2l: fixed_input = true;        fixed_result = true;        round_result = false;      needs_stub = false; break;
     case Bytecodes::_d2l: fixed_input = true;        fixed_result = true;        round_result = false;      needs_stub = false; break;
     default: ShouldNotReachHere();
   }
   LIRItem value(x->value(), this);
   value.load_item();
   LIR_Opr input = value.result();
   LIR_Opr result = rlock(x);
   // arguments of lir_convert
   LIR_Opr conv_input = input;
   LIR_Opr conv_result = result;
   ConversionStub* stub = NULL;
   if (fixed_input) {
     conv_input = fixed_register_for(input->type());
     __ move(input, conv_input);
   }
   assert(fixed_result == false || round_result == false, "cannot set both");
   if (fixed_result) {
     conv_result = fixed_register_for(result->type());
   } else if (round_result) {
     result = new_register(result->type());
     set_vreg_flag(result, must_start_in_memory);
   }
   if (needs_stub) {
     stub = new ConversionStub(x->op(), conv_input, conv_result);
   }
   __ convert(x->op(), conv_input, conv_result, stub);
   if (result != conv_result) {
     __ move(conv_result, result);
   }
   assert(result->is_virtual(), "result must be virtual register");
   set_result(x, result);
 }
 void LIRGenerator::do_NewInstance(NewInstance* x) {
   print_if_not_loaded(x);
   CodeEmitInfo* info = state_for(x, x->state());
   LIR_Opr reg = result_register_for(x->type());
   new_instance(reg, x->klass(), x->is_unresolved(),
                        FrameMap::rcx_oop_opr,
                        FrameMap::rdi_oop_opr,
                        FrameMap::rsi_oop_opr,
                        LIR_OprFact::illegalOpr,
                        FrameMap::rdx_metadata_opr, info);
   LIR_Opr result = rlock_result(x);
   __ move(reg, result);
 }
 void LIRGenerator::do_NewTypeArray(NewTypeArray* x) {
   CodeEmitInfo* info = state_for(x, x->state());
   LIRItem length(x->length(), this);
   length.load_item_force(FrameMap::rbx_opr);
   LIR_Opr reg = result_register_for(x->type());
   LIR_Opr tmp1 = FrameMap::rcx_oop_opr;
   LIR_Opr tmp2 = FrameMap::rsi_oop_opr;
   LIR_Opr tmp3 = FrameMap::rdi_oop_opr;
   LIR_Opr tmp4 = reg;
   LIR_Opr klass_reg = FrameMap::rdx_metadata_opr;
   LIR_Opr len = length.result();
   BasicType elem_type = x->elt_type();
   __ metadata2reg(ciTypeArrayKlass::make(elem_type)->constant_encoding(), klass_reg);
   CodeStub* slow_path = new NewTypeArrayStub(klass_reg, len, reg, info);
   __ allocate_array(reg, len, tmp1, tmp2, tmp3, tmp4, elem_type, klass_reg, slow_path);
   LIR_Opr result = rlock_result(x);
   __ move(reg, result);
 }
 void LIRGenerator::do_NewObjectArray(NewObjectArray* x) {
   LIRItem length(x->length(), this);
   // in case of patching (i.e., object class is not yet loaded), we need to reexecute the instruction
   // and therefore provide the state before the parameters have been consumed
   CodeEmitInfo* patching_info = NULL;
   if (!x->klass()->is_loaded() || PatchALot) {
     patching_info =  state_for(x, x->state_before());
   }
   CodeEmitInfo* info = state_for(x, x->state());
   const LIR_Opr reg = result_register_for(x->type());
   LIR_Opr tmp1 = FrameMap::rcx_oop_opr;
   LIR_Opr tmp2 = FrameMap::rsi_oop_opr;
   LIR_Opr tmp3 = FrameMap::rdi_oop_opr;
   LIR_Opr tmp4 = reg;
   LIR_Opr klass_reg = FrameMap::rdx_metadata_opr;
   length.load_item_force(FrameMap::rbx_opr);
   LIR_Opr len = length.result();
   CodeStub* slow_path = new NewObjectArrayStub(klass_reg, len, reg, info);
   ciKlass* obj = (ciKlass*) ciObjArrayKlass::make(x->klass());
   if (obj == ciEnv::unloaded_ciobjarrayklass()) {
     BAILOUT("encountered unloaded_ciobjarrayklass due to out of memory error");
   }
   klass2reg_with_patching(klass_reg, obj, patching_info);
   __ allocate_array(reg, len, tmp1, tmp2, tmp3, tmp4, T_OBJECT, klass_reg, slow_path);
   LIR_Opr result = rlock_result(x);
   __ move(reg, result);
 }
 void LIRGenerator::do_NewMultiArray(NewMultiArray* x) {
   Values* dims = x->dims();
   int i = dims->length();
   LIRItemList* items = new LIRItemList(dims->length(), NULL);
   while (i-- > 0) {
     LIRItem* size = new LIRItem(dims->at(i), this);
     items->at_put(i, size);
   }
   // Evaluate state_for early since it may emit code.
   CodeEmitInfo* patching_info = NULL;
   if (!x->klass()->is_loaded() || PatchALot) {
     patching_info = state_for(x, x->state_before());
     // Cannot re-use same xhandlers for multiple CodeEmitInfos, so
     // clone all handlers (NOTE: Usually this is handled transparently
     // by the CodeEmitInfo cloning logic in CodeStub constructors but
     // is done explicitly here because a stub isn't being used).
     x->set_exception_handlers(new XHandlers(x->exception_handlers()));
   }
   CodeEmitInfo* info = state_for(x, x->state());
   i = dims->length();
   while (i-- > 0) {
     LIRItem* size = items->at(i);
     size->load_nonconstant();
     store_stack_parameter(size->result(), in_ByteSize(i*4));
   }
   LIR_Opr klass_reg = FrameMap::rax_metadata_opr;
   klass2reg_with_patching(klass_reg, x->klass(), patching_info);
   LIR_Opr rank = FrameMap::rbx_opr;
   __ move(LIR_OprFact::intConst(x->rank()), rank);
   LIR_Opr varargs = FrameMap::rcx_opr;
   __ move(FrameMap::rsp_opr, varargs);
   LIR_OprList* args = new LIR_OprList(3);
   args->append(klass_reg);
   args->append(rank);
   args->append(varargs);
   LIR_Opr reg = result_register_for(x->type());
   __ call_runtime(Runtime1::entry_for(Runtime1::new_multi_array_id),
                   LIR_OprFact::illegalOpr,
                   reg, args, info);
   LIR_Opr result = rlock_result(x);
   __ move(reg, result);
 }
 void LIRGenerator::do_BlockBegin(BlockBegin* x) {
   // nothing to do for now
 }
 void LIRGenerator::do_CheckCast(CheckCast* x) {
   LIRItem obj(x->obj(), this);
   CodeEmitInfo* patching_info = NULL;
   if (!x->klass()->is_loaded() || (PatchALot && !x->is_incompatible_class_change_check())) {
     // must do this before locking the destination register as an oop register,
     // and before the obj is loaded (the latter is for deoptimization)
     patching_info = state_for(x, x->state_before());
   }
   obj.load_item();
   // info for exceptions
   CodeEmitInfo* info_for_exception = state_for(x);
   CodeStub* stub;
   if (x->is_incompatible_class_change_check()) {
     assert(patching_info == NULL, "can't patch this");
     stub = new SimpleExceptionStub(Runtime1::throw_incompatible_class_change_error_id, LIR_OprFact::illegalOpr, info_for_exception);
   } else {
     stub = new SimpleExceptionStub(Runtime1::throw_class_cast_exception_id, obj.result(), info_for_exception);
   }
   LIR_Opr reg = rlock_result(x);
   LIR_Opr tmp3 = LIR_OprFact::illegalOpr;
   if (!x->klass()->is_loaded() || UseCompressedClassPointers) {
     tmp3 = new_register(objectType);
   }
   __ checkcast(reg, obj.result(), x->klass(),
                new_register(objectType), new_register(objectType), tmp3,
                x->direct_compare(), info_for_exception, patching_info, stub,
                x->profiled_method(), x->profiled_bci());
 }
 void LIRGenerator::do_InstanceOf(InstanceOf* x) {
   LIRItem obj(x->obj(), this);
   // result and test object may not be in same register
   LIR_Opr reg = rlock_result(x);
   CodeEmitInfo* patching_info = NULL;
   if ((!x->klass()->is_loaded() || PatchALot)) {
     // must do this before locking the destination register as an oop register
     patching_info = state_for(x, x->state_before());
   }
   obj.load_item();
   LIR_Opr tmp3 = LIR_OprFact::illegalOpr;
   if (!x->klass()->is_loaded() || UseCompressedClassPointers) {
     tmp3 = new_register(objectType);
   }
   __ instanceof(reg, obj.result(), x->klass(),
                 new_register(objectType), new_register(objectType), tmp3,
                 x->direct_compare(), patching_info, x->profiled_method(), x->profiled_bci());
 }
 void LIRGenerator::do_If(If* x) {
   assert(x->number_of_sux() == 2, "inconsistency");
   ValueTag tag = x->x()->type()->tag();
   bool is_safepoint = x->is_safepoint();
   If::Condition cond = x->cond();
   LIRItem xitem(x->x(), this);
   LIRItem yitem(x->y(), this);
   LIRItem* xin = &xitem;
   LIRItem* yin = &yitem;
   if (tag == longTag) {
     // for longs, only conditions "eql", "neq", "lss", "geq" are valid;
     // mirror for other conditions
     if (cond == If::gtr || cond == If::leq) {
       cond = Instruction::mirror(cond);
       xin = &yitem;
       yin = &xitem;
     }
     xin->set_destroys_register();
   }
   xin->load_item();
   if (tag == longTag && yin->is_constant() && yin->get_jlong_constant() == 0 && (cond == If::eql || cond == If::neq)) {
     // inline long zero
     yin->dont_load_item();
   } else if (tag == longTag || tag == floatTag || tag == doubleTag) {
     // longs cannot handle constants at right side
     yin->load_item();
   } else {
     yin->dont_load_item();
   }
   // add safepoint before generating condition code so it can be recomputed
   if (x->is_safepoint()) {
     // increment backedge counter if needed
     increment_backedge_counter(state_for(x, x->state_before()), x->profiled_bci());
     __ safepoint(LIR_OprFact::illegalOpr, state_for(x, x->state_before()));
   }
   set_no_result(x);
   LIR_Opr left = xin->result();
   LIR_Opr right = yin->result();
   __ cmp(lir_cond(cond), left, right);
   // Generate branch profiling. Profiling code doesn't kill flags.
   profile_branch(x, cond);
   move_to_phi(x->state());
   if (x->x()->type()->is_float_kind()) {
     __ branch(lir_cond(cond), right->type(), x->tsux(), x->usux());
   } else {
     __ branch(lir_cond(cond), right->type(), x->tsux());
   }
   assert(x->default_sux() == x->fsux(), "wrong destination above");
   __ jump(x->default_sux());
 }
 LIR_Opr LIRGenerator::getThreadPointer() {
 #ifdef _LP64
   return FrameMap::as_pointer_opr(r15_thread);
 #else
   LIR_Opr result = new_register(T_INT);
   __ get_thread(result);
   return result;
 #endif //
 }
 void LIRGenerator::trace_block_entry(BlockBegin* block) {
   store_stack_parameter(LIR_OprFact::intConst(block->block_id()), in_ByteSize(0));
   LIR_OprList* args = new LIR_OprList();
   address func = CAST_FROM_FN_PTR(address, Runtime1::trace_block_entry);
   __ call_runtime_leaf(func, LIR_OprFact::illegalOpr, LIR_OprFact::illegalOpr, args);
 }
 void LIRGenerator::volatile_field_store(LIR_Opr value, LIR_Address* address,
                                         CodeEmitInfo* info) {
   if (address->type() == T_LONG) {
     address = new LIR_Address(address->base(),
                               address->index(), address->scale(),
                               address->disp(), T_DOUBLE);
     // Transfer the value atomically by using FP moves.  This means
     // the value has to be moved between CPU and FPU registers.  It
     // always has to be moved through spill slot since there's no
     // quick way to pack the value into an SSE register.
     LIR_Opr temp_double = new_register(T_DOUBLE);
     LIR_Opr spill = new_register(T_LONG);
     set_vreg_flag(spill, must_start_in_memory);
     __ move(value, spill);
     __ volatile_move(spill, temp_double, T_LONG);
     __ volatile_move(temp_double, LIR_OprFact::address(address), T_LONG, info);
   } else {
     __ store(value, address, info);
   }
 }
 void LIRGenerator::volatile_field_load(LIR_Address* address, LIR_Opr result,
                                        CodeEmitInfo* info) {
   if (address->type() == T_LONG) {
     address = new LIR_Address(address->base(),
                               address->index(), address->scale(),
                               address->disp(), T_DOUBLE);
     // Transfer the value atomically by using FP moves.  This means
     // the value has to be moved between CPU and FPU registers.  In
     // SSE0 and SSE1 mode it has to be moved through spill slot but in
     // SSE2+ mode it can be moved directly.
     LIR_Opr temp_double = new_register(T_DOUBLE);
     __ volatile_move(LIR_OprFact::address(address), temp_double, T_LONG, info);
     __ volatile_move(temp_double, result, T_LONG);
     if (UseSSE < 2) {
       // no spill slot needed in SSE2 mode because xmm->cpu register move is possible
       set_vreg_flag(result, must_start_in_memory);
     }
   } else {
     __ load(address, result, info);
   }
 }
 void LIRGenerator::get_Object_unsafe(LIR_Opr dst, LIR_Opr src, LIR_Opr offset,
                                      BasicType type, bool is_volatile) {
   if (is_volatile && type == T_LONG) {
     LIR_Address* addr = new LIR_Address(src, offset, T_DOUBLE);
     LIR_Opr tmp = new_register(T_DOUBLE);
     __ load(addr, tmp);
     LIR_Opr spill = new_register(T_LONG);
     set_vreg_flag(spill, must_start_in_memory);
     __ move(tmp, spill);
     __ move(spill, dst);
   } else {
     LIR_Address* addr = new LIR_Address(src, offset, type);
     __ load(addr, dst);
   }
 }
 void LIRGenerator::put_Object_unsafe(LIR_Opr src, LIR_Opr offset, LIR_Opr data,
                                      BasicType type, bool is_volatile) {
   if (is_volatile && type == T_LONG) {
     LIR_Address* addr = new LIR_Address(src, offset, T_DOUBLE);
     LIR_Opr tmp = new_register(T_DOUBLE);
     LIR_Opr spill = new_register(T_DOUBLE);
     set_vreg_flag(spill, must_start_in_memory);
     __ move(data, spill);
     __ move(spill, tmp);
     __ move(tmp, addr);
   } else {
     LIR_Address* addr = new LIR_Address(src, offset, type);
     bool is_obj = (type == T_ARRAY || type == T_OBJECT);
     if (is_obj) {
       // Do the pre-write barrier, if any.
       pre_barrier(LIR_OprFact::address(addr), LIR_OprFact::illegalOpr /* pre_val */,
                   true /* do_load */, false /* patch */, NULL);
       __ move(data, addr);
       assert(src->is_register(), "must be register");
       // Seems to be a precise address
       post_barrier(LIR_OprFact::address(addr), data);
     } else {
       __ move(data, addr);
     }
   }
 }
 void LIRGenerator::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) {
   BasicType type = x->basic_type();
   LIRItem src(x->object(), this);
   LIRItem off(x->offset(), this);
   LIRItem value(x->value(), this);
   src.load_item();
   value.load_item();
   off.load_nonconstant();
   LIR_Opr dst = rlock_result(x, type);
   LIR_Opr data = value.result();
   bool is_obj = (type == T_ARRAY || type == T_OBJECT);
   LIR_Opr offset = off.result();
   assert (type == T_INT || (!x->is_add() && is_obj) LP64_ONLY( || type == T_LONG ), "unexpected type");
   LIR_Address* addr;
   if (offset->is_constant()) {
 #ifdef _LP64
     jlong c = offset->as_jlong();
     if ((jlong)((jint)c) == c) {
       addr = new LIR_Address(src.result(), (jint)c, type);
     } else {
       LIR_Opr tmp = new_register(T_LONG);
       __ move(offset, tmp);
       addr = new LIR_Address(src.result(), tmp, type);
     }
 #else
     addr = new LIR_Address(src.result(), offset->as_jint(), type);
 #endif
   } else {
     addr = new LIR_Address(src.result(), offset, type);
   }
   // Because we want a 2-arg form of xchg and xadd
   __ move(data, dst);
   if (x->is_add()) {
     __ xadd(LIR_OprFact::address(addr), dst, dst, LIR_OprFact::illegalOpr);
   } else {
     if (is_obj) {
       // Do the pre-write barrier, if any.
       pre_barrier(LIR_OprFact::address(addr), LIR_OprFact::illegalOpr /* pre_val */,
                   true /* do_load */, false /* patch */, NULL);
     }
     __ xchg(LIR_OprFact::address(addr), dst, dst, LIR_OprFact::illegalOpr);
     if (is_obj) {
       // Seems to be a precise address
       post_barrier(LIR_OprFact::address(addr), data);
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/c1_LIRGenerator_x86.cpp@7ae4e26cb1e0 (annotated)

src/cpu/x86/vm/c1_LIRGenerator_x86.cpp