Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_stubGenerator_sparc.cpp.incl"

 // Declaration and definition of StubGenerator (no .hpp file).

 // For a more detailed description of the stub routine structure

 // see the comment in stubRoutines.hpp.

 #define __ _masm->

 #ifdef PRODUCT

 #define BLOCK_COMMENT(str) /* nothing */

 #else

 #define BLOCK_COMMENT(str) __ block_comment(str)

 #endif

 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")

 // Note:  The register L7 is used as L7_thread_cache, and may not be used

 //        any other way within this module.

 static const Register& Lstub_temp = L2;

 // -------------------------------------------------------------------------------------------------------------------------

 // Stub Code definitions

 static address handle_unsafe_access() {

   JavaThread* thread = JavaThread::current();

   address pc  = thread->saved_exception_pc();

   address npc = thread->saved_exception_npc();

   // pc is the instruction which we must emulate

   // doing a no-op is fine:  return garbage from the load

   // request an async exception

   thread->set_pending_unsafe_access_error();

   // return address of next instruction to execute

   return npc;

 }

 class StubGenerator: public StubCodeGenerator {

  private:

 #ifdef PRODUCT

 #define inc_counter_np(a,b,c) (0)

 #else

   void inc_counter_np_(int& counter, Register t1, Register t2) {

     Address counter_addr(t2, (address) &counter);

     __ sethi(counter_addr);

     __ ld(counter_addr, t1);

     __ inc(t1);

     __ st(t1, counter_addr);

   }

 #define inc_counter_np(counter, t1, t2) \

   BLOCK_COMMENT("inc_counter " #counter); \

   inc_counter_np_(counter, t1, t2);

 #endif

   //----------------------------------------------------------------------------------------------------

   // Call stubs are used to call Java from C

   address generate_call_stub(address& return_pc) {

     StubCodeMark mark(this, "StubRoutines", "call_stub");

     address start = __ pc();

     // Incoming arguments:

     //

     // o0         : call wrapper address

     // o1         : result (address)

     // o2         : result type

     // o3         : method

     // o4         : (interpreter) entry point

     // o5         : parameters (address)

     // [sp + 0x5c]: parameter size (in words)

     // [sp + 0x60]: thread

     //

     // +---------------+ <--- sp + 0

     // |               |

     // . reg save area .

     // |               |

     // +---------------+ <--- sp + 0x40

     // |               |

     // . extra 7 slots .

     // |               |

     // +---------------+ <--- sp + 0x5c

     // |  param. size  |

     // +---------------+ <--- sp + 0x60

     // |    thread     |

     // +---------------+

     // |               |

     // note: if the link argument position changes, adjust

     //       the code in frame::entry_frame_call_wrapper()

     const Argument link           = Argument(0, false); // used only for GC

     const Argument result         = Argument(1, false);

     const Argument result_type    = Argument(2, false);

     const Argument method         = Argument(3, false);

     const Argument entry_point    = Argument(4, false);

     const Argument parameters     = Argument(5, false);

     const Argument parameter_size = Argument(6, false);

     const Argument thread         = Argument(7, false);

     // setup thread register

     __ ld_ptr(thread.as_address(), G2_thread);

     __ reinit_heapbase();

 #ifdef ASSERT

     // make sure we have no pending exceptions

     { const Register t = G3_scratch;

       Label L;

       __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), t);

       __ br_null(t, false, Assembler::pt, L);

       __ delayed()->nop();

       __ stop("StubRoutines::call_stub: entered with pending exception");

       __ bind(L);

     }

 #endif

     // create activation frame & allocate space for parameters

     { const Register t = G3_scratch;

       __ ld_ptr(parameter_size.as_address(), t);                // get parameter size (in words)

       __ add(t, frame::memory_parameter_word_sp_offset, t);     // add space for save area (in words)

       __ round_to(t, WordsPerLong);                             // make sure it is multiple of 2 (in words)

       __ sll(t, Interpreter::logStackElementSize(), t);                    // compute number of bytes

       __ neg(t);                                                // negate so it can be used with save

       __ save(SP, t, SP);                                       // setup new frame

     }

     // +---------------+ <--- sp + 0

     // |               |

     // . reg save area .

     // |               |

     // +---------------+ <--- sp + 0x40

     // |               |

     // . extra 7 slots .

     // |               |

     // +---------------+ <--- sp + 0x5c

     // |  empty slot   |      (only if parameter size is even)

     // +---------------+

     // |               |

     // .  parameters   .

     // |               |

     // +---------------+ <--- fp + 0

     // |               |

     // . reg save area .

     // |               |

     // +---------------+ <--- fp + 0x40

     // |               |

     // . extra 7 slots .

     // |               |

     // +---------------+ <--- fp + 0x5c

     // |  param. size  |

     // +---------------+ <--- fp + 0x60

     // |    thread     |

     // +---------------+

     // |               |

     // pass parameters if any

     BLOCK_COMMENT("pass parameters if any");

     { const Register src = parameters.as_in().as_register();

       const Register dst = Lentry_args;

       const Register tmp = G3_scratch;

       const Register cnt = G4_scratch;

       // test if any parameters & setup of Lentry_args

       Label exit;

       __ ld_ptr(parameter_size.as_in().as_address(), cnt);      // parameter counter

       __ add( FP, STACK_BIAS, dst );

       __ tst(cnt);

       __ br(Assembler::zero, false, Assembler::pn, exit);

       __ delayed()->sub(dst, BytesPerWord, dst);                 // setup Lentry_args

       // copy parameters if any

       Label loop;

       __ BIND(loop);

       // Store tag first.

       if (TaggedStackInterpreter) {

         __ ld_ptr(src, 0, tmp);

         __ add(src, BytesPerWord, src);  // get next

         __ st_ptr(tmp, dst, Interpreter::tag_offset_in_bytes());

       }

       // Store parameter value

       __ ld_ptr(src, 0, tmp);

       __ add(src, BytesPerWord, src);

       __ st_ptr(tmp, dst, Interpreter::value_offset_in_bytes());

       __ deccc(cnt);

       __ br(Assembler::greater, false, Assembler::pt, loop);

       __ delayed()->sub(dst, Interpreter::stackElementSize(), dst);

       // done

       __ BIND(exit);

     }

     // setup parameters, method & call Java function

 #ifdef ASSERT

     // layout_activation_impl checks it's notion of saved SP against

     // this register, so if this changes update it as well.

     const Register saved_SP = Lscratch;

     __ mov(SP, saved_SP);                               // keep track of SP before call

 #endif

     // setup parameters

     const Register t = G3_scratch;

     __ ld_ptr(parameter_size.as_in().as_address(), t); // get parameter size (in words)

     __ sll(t, Interpreter::logStackElementSize(), t);            // compute number of bytes

     __ sub(FP, t, Gargs);                              // setup parameter pointer

 #ifdef _LP64

     __ add( Gargs, STACK_BIAS, Gargs );                // Account for LP64 stack bias

 #endif

     __ mov(SP, O5_savedSP);

     // do the call

     //

     // the following register must be setup:

     //

     // G2_thread

     // G5_method

     // Gargs

     BLOCK_COMMENT("call Java function");

     __ jmpl(entry_point.as_in().as_register(), G0, O7);

     __ delayed()->mov(method.as_in().as_register(), G5_method);   // setup method

     BLOCK_COMMENT("call_stub_return_address:");

     return_pc = __ pc();

     // The callee, if it wasn't interpreted, can return with SP changed so

     // we can no longer assert of change of SP.

     // store result depending on type

     // (everything that is not T_OBJECT, T_LONG, T_FLOAT, or T_DOUBLE

     //  is treated as T_INT)

     { const Register addr = result     .as_in().as_register();

       const Register type = result_type.as_in().as_register();

       Label is_long, is_float, is_double, is_object, exit;

       __            cmp(type, T_OBJECT);  __ br(Assembler::equal, false, Assembler::pn, is_object);

       __ delayed()->cmp(type, T_FLOAT);   __ br(Assembler::equal, false, Assembler::pn, is_float);

       __ delayed()->cmp(type, T_DOUBLE);  __ br(Assembler::equal, false, Assembler::pn, is_double);

       __ delayed()->cmp(type, T_LONG);    __ br(Assembler::equal, false, Assembler::pn, is_long);

       __ delayed()->nop();

       // store int result

       __ st(O0, addr, G0);

       __ BIND(exit);

       __ ret();

       __ delayed()->restore();

       __ BIND(is_object);

       __ ba(false, exit);

       __ delayed()->st_ptr(O0, addr, G0);

       __ BIND(is_float);

       __ ba(false, exit);

       __ delayed()->stf(FloatRegisterImpl::S, F0, addr, G0);

       __ BIND(is_double);

       __ ba(false, exit);

       __ delayed()->stf(FloatRegisterImpl::D, F0, addr, G0);

       __ BIND(is_long);

 #ifdef _LP64

       __ ba(false, exit);

       __ delayed()->st_long(O0, addr, G0);      // store entire long

 #else

 #if defined(COMPILER2)

   // All return values are where we want them, except for Longs.  C2 returns

   // longs in G1 in the 32-bit build whereas the interpreter wants them in O0/O1.

   // Since the interpreter will return longs in G1 and O0/O1 in the 32bit

   // build we simply always use G1.

   // Note: I tried to make c2 return longs in O0/O1 and G1 so we wouldn't have to

   // do this here. Unfortunately if we did a rethrow we'd see an machepilog node

   // first which would move g1 -> O0/O1 and destroy the exception we were throwing.

       __ ba(false, exit);

       __ delayed()->stx(G1, addr, G0);  // store entire long

 #else

       __ st(O1, addr, BytesPerInt);

       __ ba(false, exit);

       __ delayed()->st(O0, addr, G0);

 #endif /* COMPILER2 */

 #endif /* _LP64 */

      }

      return start;

   }

   //----------------------------------------------------------------------------------------------------

   // Return point for a Java call if there's an exception thrown in Java code.

   // The exception is caught and transformed into a pending exception stored in

   // JavaThread that can be tested from within the VM.

   //

   // Oexception: exception oop

   address generate_catch_exception() {

     StubCodeMark mark(this, "StubRoutines", "catch_exception");

     address start = __ pc();

     // verify that thread corresponds

     __ verify_thread();

     const Register& temp_reg = Gtemp;

     Address pending_exception_addr    (G2_thread, 0, in_bytes(Thread::pending_exception_offset()));

     Address exception_file_offset_addr(G2_thread, 0, in_bytes(Thread::exception_file_offset   ()));

     Address exception_line_offset_addr(G2_thread, 0, in_bytes(Thread::exception_line_offset   ()));

     // set pending exception

     __ verify_oop(Oexception);

     __ st_ptr(Oexception, pending_exception_addr);

     __ set((intptr_t)__FILE__, temp_reg);

     __ st_ptr(temp_reg, exception_file_offset_addr);

     __ set((intptr_t)__LINE__, temp_reg);

     __ st(temp_reg, exception_line_offset_addr);

     // complete return to VM

     assert(StubRoutines::_call_stub_return_address != NULL, "must have been generated before");

     Address stub_ret(temp_reg, StubRoutines::_call_stub_return_address);

     __ jump_to(stub_ret);

     __ delayed()->nop();

     return start;

   }

   //----------------------------------------------------------------------------------------------------

   // Continuation point for runtime calls returning with a pending exception

   // The pending exception check happened in the runtime or native call stub

   // The pending exception in Thread is converted into a Java-level exception

   //

   // Contract with Java-level exception handler: O0 = exception

   //                                             O1 = throwing pc

   address generate_forward_exception() {

     StubCodeMark mark(this, "StubRoutines", "forward_exception");

     address start = __ pc();

     // Upon entry, O7 has the return address returning into Java

     // (interpreted or compiled) code; i.e. the return address

     // becomes the throwing pc.

     const Register& handler_reg = Gtemp;

     Address exception_addr (G2_thread, 0, in_bytes(Thread::pending_exception_offset()));

 #ifdef ASSERT

     // make sure that this code is only executed if there is a pending exception

     { Label L;

       __ ld_ptr(exception_addr, Gtemp);

       __ br_notnull(Gtemp, false, Assembler::pt, L);

       __ delayed()->nop();

       __ stop("StubRoutines::forward exception: no pending exception (1)");

       __ bind(L);

     }

 #endif

     // compute exception handler into handler_reg

     __ get_thread();

     __ ld_ptr(exception_addr, Oexception);

     __ verify_oop(Oexception);

     __ save_frame(0);             // compensates for compiler weakness

     __ add(O7->after_save(), frame::pc_return_offset, Lscratch); // save the issuing PC

     BLOCK_COMMENT("call exception_handler_for_return_address");

     __ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), Lscratch);

     __ mov(O0, handler_reg);

     __ restore();                 // compensates for compiler weakness

     __ ld_ptr(exception_addr, Oexception);

     __ add(O7, frame::pc_return_offset, Oissuing_pc); // save the issuing PC

 #ifdef ASSERT

     // make sure exception is set

     { Label L;

       __ br_notnull(Oexception, false, Assembler::pt, L);

       __ delayed()->nop();

       __ stop("StubRoutines::forward exception: no pending exception (2)");

       __ bind(L);

     }

 #endif

     // jump to exception handler

     __ jmp(handler_reg, 0);

     // clear pending exception

     __ delayed()->st_ptr(G0, exception_addr);

     return start;

   }

   //------------------------------------------------------------------------------------------------------------------------

   // Continuation point for throwing of implicit exceptions that are not handled in

   // the current activation. Fabricates an exception oop and initiates normal

   // exception dispatching in this frame. Only callee-saved registers are preserved

   // (through the normal register window / RegisterMap handling).

   // If the compiler needs all registers to be preserved between the fault

   // point and the exception handler then it must assume responsibility for that in

   // AbstractCompiler::continuation_for_implicit_null_exception or

   // continuation_for_implicit_division_by_zero_exception. All other implicit

   // exceptions (e.g., NullPointerException or AbstractMethodError on entry) are

   // either at call sites or otherwise assume that stack unwinding will be initiated,

   // so caller saved registers were assumed volatile in the compiler.

   // Note that we generate only this stub into a RuntimeStub, because it needs to be

   // properly traversed and ignored during GC, so we change the meaning of the "__"

   // macro within this method.

 #undef __

 #define __ masm->

   address generate_throw_exception(const char* name, address runtime_entry, bool restore_saved_exception_pc) {

 #ifdef ASSERT

     int insts_size = VerifyThread ? 1 * K : 600;

 #else

     int insts_size = VerifyThread ? 1 * K : 256;

 #endif /* ASSERT */

     int locs_size  = 32;

     CodeBuffer      code(name, insts_size, locs_size);

     MacroAssembler* masm = new MacroAssembler(&code);

     __ verify_thread();

     // This is an inlined and slightly modified version of call_VM

     // which has the ability to fetch the return PC out of thread-local storage

     __ assert_not_delayed();

     // Note that we always push a frame because on the SPARC

     // architecture, for all of our implicit exception kinds at call

     // sites, the implicit exception is taken before the callee frame

     // is pushed.

     __ save_frame(0);

     int frame_complete = __ offset();

     if (restore_saved_exception_pc) {

       Address saved_exception_pc(G2_thread, 0, in_bytes(JavaThread::saved_exception_pc_offset()));

       __ ld_ptr(saved_exception_pc, I7);

       __ sub(I7, frame::pc_return_offset, I7);

     }

     // Note that we always have a runtime stub frame on the top of stack by this point

     Register last_java_sp = SP;

     // 64-bit last_java_sp is biased!

     __ set_last_Java_frame(last_java_sp, G0);

     if (VerifyThread)  __ mov(G2_thread, O0); // about to be smashed; pass early

     __ save_thread(noreg);

     // do the call

     BLOCK_COMMENT("call runtime_entry");

     __ call(runtime_entry, relocInfo::runtime_call_type);

     if (!VerifyThread)

       __ delayed()->mov(G2_thread, O0);  // pass thread as first argument

     else

       __ delayed()->nop();             // (thread already passed)

     __ restore_thread(noreg);

     __ reset_last_Java_frame();

     // check for pending exceptions. use Gtemp as scratch register.

 #ifdef ASSERT

     Label L;

     Address exception_addr(G2_thread, 0, in_bytes(Thread::pending_exception_offset()));

     Register scratch_reg = Gtemp;

     __ ld_ptr(exception_addr, scratch_reg);

     __ br_notnull(scratch_reg, false, Assembler::pt, L);

     __ delayed()->nop();

     __ should_not_reach_here();

     __ bind(L);

 #endif // ASSERT

     BLOCK_COMMENT("call forward_exception_entry");

     __ call(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);

     // we use O7 linkage so that forward_exception_entry has the issuing PC

     __ delayed()->restore();

     RuntimeStub* stub = RuntimeStub::new_runtime_stub(name, &code, frame_complete, masm->total_frame_size_in_bytes(0), NULL, false);

     return stub->entry_point();

   }

 #undef __

 #define __ _masm->

   // Generate a routine that sets all the registers so we

   // can tell if the stop routine prints them correctly.

   address generate_test_stop() {

     StubCodeMark mark(this, "StubRoutines", "test_stop");

     address start = __ pc();

     int i;

     __ save_frame(0);

     static jfloat zero = 0.0, one = 1.0;

     // put addr in L0, then load through L0 to F0

     __ set((intptr_t)&zero, L0);  __ ldf( FloatRegisterImpl::S, L0, 0, F0);

     __ set((intptr_t)&one,  L0);  __ ldf( FloatRegisterImpl::S, L0, 0, F1); // 1.0 to F1

     // use add to put 2..18 in F2..F18

     for ( i = 2;  i <= 18;  ++i ) {

       __ fadd( FloatRegisterImpl::S, F1, as_FloatRegister(i-1),  as_FloatRegister(i));

     }

     // Now put double 2 in F16, double 18 in F18

     __ ftof( FloatRegisterImpl::S, FloatRegisterImpl::D, F2, F16 );

     __ ftof( FloatRegisterImpl::S, FloatRegisterImpl::D, F18, F18 );

     // use add to put 20..32 in F20..F32

     for (i = 20; i < 32; i += 2) {

       __ fadd( FloatRegisterImpl::D, F16, as_FloatRegister(i-2),  as_FloatRegister(i));

     }

     // put 0..7 in i's, 8..15 in l's, 16..23 in o's, 24..31 in g's

     for ( i = 0; i < 8; ++i ) {

       if (i < 6) {

         __ set(     i, as_iRegister(i));

         __ set(16 + i, as_oRegister(i));

         __ set(24 + i, as_gRegister(i));

       }

       __ set( 8 + i, as_lRegister(i));

     }

     __ stop("testing stop");

     __ ret();

     __ delayed()->restore();

     return start;

   }

   address generate_stop_subroutine() {

     StubCodeMark mark(this, "StubRoutines", "stop_subroutine");

     address start = __ pc();

     __ stop_subroutine();

     return start;

   }

   address generate_flush_callers_register_windows() {

     StubCodeMark mark(this, "StubRoutines", "flush_callers_register_windows");

     address start = __ pc();

     __ flush_windows();

     __ retl(false);

     __ delayed()->add( FP, STACK_BIAS, O0 );

     // The returned value must be a stack pointer whose register save area

     // is flushed, and will stay flushed while the caller executes.

     return start;

   }

   // Helper functions for v8 atomic operations.

   //

   void get_v8_oop_lock_ptr(Register lock_ptr_reg, Register mark_oop_reg, Register scratch_reg) {

     if (mark_oop_reg == noreg) {

       address lock_ptr = (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr();

       __ set((intptr_t)lock_ptr, lock_ptr_reg);

     } else {

       assert(scratch_reg != noreg, "just checking");

       address lock_ptr = (address)StubRoutines::Sparc::_v8_oop_lock_cache;

       __ set((intptr_t)lock_ptr, lock_ptr_reg);

       __ and3(mark_oop_reg, StubRoutines::Sparc::v8_oop_lock_mask_in_place, scratch_reg);

       __ add(lock_ptr_reg, scratch_reg, lock_ptr_reg);

     }

   }

   void generate_v8_lock_prologue(Register lock_reg, Register lock_ptr_reg, Register yield_reg, Label& retry, Label& dontyield, Register mark_oop_reg = noreg, Register scratch_reg = noreg) {

     get_v8_oop_lock_ptr(lock_ptr_reg, mark_oop_reg, scratch_reg);

     __ set(StubRoutines::Sparc::locked, lock_reg);

     // Initialize yield counter

     __ mov(G0,yield_reg);

     __ BIND(retry);

     __ cmp(yield_reg, V8AtomicOperationUnderLockSpinCount);

     __ br(Assembler::less, false, Assembler::pt, dontyield);

     __ delayed()->nop();

     // This code can only be called from inside the VM, this

     // stub is only invoked from Atomic::add().  We do not

     // want to use call_VM, because _last_java_sp and such

     // must already be set.

     //

     // Save the regs and make space for a C call

     __ save(SP, -96, SP);

     __ save_all_globals_into_locals();

     BLOCK_COMMENT("call os::naked_sleep");

     __ call(CAST_FROM_FN_PTR(address, os::naked_sleep));

     __ delayed()->nop();

     __ restore_globals_from_locals();

     __ restore();

     // reset the counter

     __ mov(G0,yield_reg);

     __ BIND(dontyield);

     // try to get lock

     __ swap(lock_ptr_reg, 0, lock_reg);

     // did we get the lock?

     __ cmp(lock_reg, StubRoutines::Sparc::unlocked);

     __ br(Assembler::notEqual, true, Assembler::pn, retry);

     __ delayed()->add(yield_reg,1,yield_reg);

     // yes, got lock. do the operation here.

   }

   void generate_v8_lock_epilogue(Register lock_reg, Register lock_ptr_reg, Register yield_reg, Label& retry, Label& dontyield, Register mark_oop_reg = noreg, Register scratch_reg = noreg) {

     __ st(lock_reg, lock_ptr_reg, 0); // unlock

   }

   // Support for jint Atomic::xchg(jint exchange_value, volatile jint* dest).

   //

   // Arguments :

   //

   //      exchange_value: O0

   //      dest:           O1

   //

   // Results:

   //

   //     O0: the value previously stored in dest

   //

   address generate_atomic_xchg() {

     StubCodeMark mark(this, "StubRoutines", "atomic_xchg");

     address start = __ pc();

     if (UseCASForSwap) {

       // Use CAS instead of swap, just in case the MP hardware

       // prefers to work with just one kind of synch. instruction.

       Label retry;

       __ BIND(retry);

       __ mov(O0, O3);       // scratch copy of exchange value

       __ ld(O1, 0, O2);     // observe the previous value

       // try to replace O2 with O3

       __ cas_under_lock(O1, O2, O3,

       (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr(),false);

       __ cmp(O2, O3);

       __ br(Assembler::notEqual, false, Assembler::pn, retry);

       __ delayed()->nop();

       __ retl(false);

       __ delayed()->mov(O2, O0);  // report previous value to caller

     } else {

       if (VM_Version::v9_instructions_work()) {

         __ retl(false);

         __ delayed()->swap(O1, 0, O0);

       } else {

         const Register& lock_reg = O2;

         const Register& lock_ptr_reg = O3;

         const Register& yield_reg = O4;

         Label retry;

         Label dontyield;

         generate_v8_lock_prologue(lock_reg, lock_ptr_reg, yield_reg, retry, dontyield);

         // got the lock, do the swap

         __ swap(O1, 0, O0);

         generate_v8_lock_epilogue(lock_reg, lock_ptr_reg, yield_reg, retry, dontyield);

         __ retl(false);

         __ delayed()->nop();

       }

     }

     return start;

   }

   // Support for jint Atomic::cmpxchg(jint exchange_value, volatile jint* dest, jint compare_value)

   //

   // Arguments :

   //

   //      exchange_value: O0

   //      dest:           O1

   //      compare_value:  O2

   //

   // Results:

   //

   //     O0: the value previously stored in dest

   //

   // Overwrites (v8): O3,O4,O5

   //

   address generate_atomic_cmpxchg() {

     StubCodeMark mark(this, "StubRoutines", "atomic_cmpxchg");

     address start = __ pc();

     // cmpxchg(dest, compare_value, exchange_value)

     __ cas_under_lock(O1, O2, O0,

       (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr(),false);

     __ retl(false);

     __ delayed()->nop();

     return start;

   }

   // Support for jlong Atomic::cmpxchg(jlong exchange_value, volatile jlong *dest, jlong compare_value)

   //

   // Arguments :

   //

   //      exchange_value: O1:O0

   //      dest:           O2

   //      compare_value:  O4:O3

   //

   // Results:

   //

   //     O1:O0: the value previously stored in dest

   //

   // This only works on V9, on V8 we don't generate any

   // code and just return NULL.

   //

   // Overwrites: G1,G2,G3

   //

   address generate_atomic_cmpxchg_long() {

     StubCodeMark mark(this, "StubRoutines", "atomic_cmpxchg_long");

     address start = __ pc();

     if (!VM_Version::supports_cx8())

         return NULL;;

     __ sllx(O0, 32, O0);

     __ srl(O1, 0, O1);

     __ or3(O0,O1,O0);      // O0 holds 64-bit value from compare_value

     __ sllx(O3, 32, O3);

     __ srl(O4, 0, O4);

     __ or3(O3,O4,O3);     // O3 holds 64-bit value from exchange_value

     __ casx(O2, O3, O0);

     __ srl(O0, 0, O1);    // unpacked return value in O1:O0

     __ retl(false);

     __ delayed()->srlx(O0, 32, O0);

     return start;

   }

   // Support for jint Atomic::add(jint add_value, volatile jint* dest).

   //

   // Arguments :

   //

   //      add_value: O0   (e.g., +1 or -1)

   //      dest:      O1

   //

   // Results:

   //

   //     O0: the new value stored in dest

   //

   // Overwrites (v9): O3

   // Overwrites (v8): O3,O4,O5

   //

   address generate_atomic_add() {

     StubCodeMark mark(this, "StubRoutines", "atomic_add");

     address start = __ pc();

     __ BIND(_atomic_add_stub);

     if (VM_Version::v9_instructions_work()) {

       Label(retry);

       __ BIND(retry);

       __ lduw(O1, 0, O2);

       __ add(O0,   O2, O3);

       __ cas(O1,   O2, O3);

       __ cmp(      O2, O3);

       __ br(Assembler::notEqual, false, Assembler::pn, retry);

       __ delayed()->nop();

       __ retl(false);

       __ delayed()->add(O0, O2, O0); // note that cas made O2==O3

     } else {

       const Register& lock_reg = O2;

       const Register& lock_ptr_reg = O3;

       const Register& value_reg = O4;

       const Register& yield_reg = O5;

       Label(retry);

       Label(dontyield);

       generate_v8_lock_prologue(lock_reg, lock_ptr_reg, yield_reg, retry, dontyield);

       // got lock, do the increment

       __ ld(O1, 0, value_reg);

       __ add(O0, value_reg, value_reg);

       __ st(value_reg, O1, 0);

       // %%% only for RMO and PSO

       __ membar(Assembler::StoreStore);

       generate_v8_lock_epilogue(lock_reg, lock_ptr_reg, yield_reg, retry, dontyield);

       __ retl(false);

       __ delayed()->mov(value_reg, O0);

     }

     return start;

   }

   Label _atomic_add_stub;  // called from other stubs

   // Support for void OrderAccess::fence().

   //

   address generate_fence() {

     StubCodeMark mark(this, "StubRoutines", "fence");

     address start = __ pc();

     __ membar(Assembler::Membar_mask_bits(Assembler::LoadLoad  | Assembler::LoadStore |

                                           Assembler::StoreLoad | Assembler::StoreStore));

     __ retl(false);

     __ delayed()->nop();

     return start;

   }

   //------------------------------------------------------------------------------------------------------------------------

   // The following routine generates a subroutine to throw an asynchronous

   // UnknownError when an unsafe access gets a fault that could not be

   // reasonably prevented by the programmer.  (Example: SIGBUS/OBJERR.)

   //

   // Arguments :

   //

   //      trapping PC:    O7

   //

   // Results:

   //     posts an asynchronous exception, skips the trapping instruction

   //

   address generate_handler_for_unsafe_access() {

     StubCodeMark mark(this, "StubRoutines", "handler_for_unsafe_access");

     address start = __ pc();

     const int preserve_register_words = (64 * 2);

     Address preserve_addr(FP, 0, (-preserve_register_words * wordSize) + STACK_BIAS);

     Register Lthread = L7_thread_cache;

     int i;

     __ save_frame(0);

     __ mov(G1, L1);

     __ mov(G2, L2);

     __ mov(G3, L3);

     __ mov(G4, L4);

     __ mov(G5, L5);

     for (i = 0; i < (VM_Version::v9_instructions_work() ? 64 : 32); i += 2) {

       __ stf(FloatRegisterImpl::D, as_FloatRegister(i), preserve_addr, i * wordSize);

     }

     address entry_point = CAST_FROM_FN_PTR(address, handle_unsafe_access);

     BLOCK_COMMENT("call handle_unsafe_access");

     __ call(entry_point, relocInfo::runtime_call_type);

     __ delayed()->nop();

     __ mov(L1, G1);

     __ mov(L2, G2);

     __ mov(L3, G3);

     __ mov(L4, G4);

     __ mov(L5, G5);

     for (i = 0; i < (VM_Version::v9_instructions_work() ? 64 : 32); i += 2) {

       __ ldf(FloatRegisterImpl::D, preserve_addr, as_FloatRegister(i), i * wordSize);

     }

     __ verify_thread();

     __ jmp(O0, 0);

     __ delayed()->restore();

     return start;

   }

   // Support for uint StubRoutine::Sparc::partial_subtype_check( Klass sub, Klass super );

   // Arguments :

   //

   //      ret  : O0, returned

   //      icc/xcc: set as O0 (depending on wordSize)

   //      sub  : O1, argument, not changed

   //      super: O2, argument, not changed

   //      raddr: O7, blown by call

   address generate_partial_subtype_check() {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", "partial_subtype_check");

     address start = __ pc();

     Label loop, miss;

     // Compare super with sub directly, since super is not in its own SSA.

     // The compiler used to emit this test, but we fold it in here,

     // to increase overall code density, with no real loss of speed.

     { Label L;

       __ cmp(O1, O2);

       __ brx(Assembler::notEqual, false, Assembler::pt, L);

       __ delayed()->nop();

       __ retl();

       __ delayed()->addcc(G0,0,O0); // set Z flags, zero result

       __ bind(L);

     }

 #if defined(COMPILER2) && !defined(_LP64)

     // Do not use a 'save' because it blows the 64-bit O registers.

     __ add(SP,-4*wordSize,SP);  // Make space for 4 temps (stack must be 2 words aligned)

     __ st_ptr(L0,SP,(frame::register_save_words+0)*wordSize);

     __ st_ptr(L1,SP,(frame::register_save_words+1)*wordSize);

     __ st_ptr(L2,SP,(frame::register_save_words+2)*wordSize);

     __ st_ptr(L3,SP,(frame::register_save_words+3)*wordSize);

     Register Rret   = O0;

     Register Rsub   = O1;

     Register Rsuper = O2;

 #else

     __ save_frame(0);

     Register Rret   = I0;

     Register Rsub   = I1;

     Register Rsuper = I2;

 #endif

     Register L0_ary_len = L0;

     Register L1_ary_ptr = L1;

     Register L2_super   = L2;

     Register L3_index   = L3;

 #ifdef _LP64

     Register L4_ooptmp  = L4;

     if (UseCompressedOops) {

       // this must be under UseCompressedOops check, as we rely upon fact

       // that L4 not clobbered in C2 on 32-bit platforms, where we do explicit save

       // on stack, see several lines above

       __ encode_heap_oop(Rsuper, L4_ooptmp);

     }

 #endif

     inc_counter_np(SharedRuntime::_partial_subtype_ctr, L0, L1);

     __ ld_ptr( Rsub, sizeof(oopDesc) + Klass::secondary_supers_offset_in_bytes(), L3 );

     __ lduw(L3,arrayOopDesc::length_offset_in_bytes(),L0_ary_len);

     __ add(L3,arrayOopDesc::base_offset_in_bytes(T_OBJECT),L1_ary_ptr);

     __ clr(L3_index);           // zero index

     // Load a little early; will load 1 off the end of the array.

     // Ok for now; revisit if we have other uses of this routine.

     if (UseCompressedOops) {

       __ lduw(L1_ary_ptr,0,L2_super);// Will load a little early

     } else {

       __ ld_ptr(L1_ary_ptr,0,L2_super);// Will load a little early

     }

     assert(heapOopSize != 0, "heapOopSize should be initialized");

     // The scan loop

     __ BIND(loop);

     __ add(L1_ary_ptr, heapOopSize, L1_ary_ptr); // Bump by OOP size

     __ cmp(L3_index,L0_ary_len);

     __ br(Assembler::equal,false,Assembler::pn,miss);

     __ delayed()->inc(L3_index); // Bump index

     if (UseCompressedOops) {

 #ifdef  _LP64

       __ subcc(L2_super,L4_ooptmp,Rret);   // Check for match; zero in Rret for a hit

       __ br( Assembler::notEqual, false, Assembler::pt, loop );

       __ delayed()->lduw(L1_ary_ptr,0,L2_super);// Will load a little early

 #else

       ShouldNotReachHere();

 #endif

     } else {

       __ subcc(L2_super,Rsuper,Rret);   // Check for match; zero in Rret for a hit

       __ brx( Assembler::notEqual, false, Assembler::pt, loop );

       __ delayed()->ld_ptr(L1_ary_ptr,0,L2_super);// Will load a little early

     }

     // Got a hit; report success; set cache.  Cache load doesn't

     // happen here; for speed it is directly emitted by the compiler.

     __ st_ptr( Rsuper, Rsub, sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes() );

 #if defined(COMPILER2) && !defined(_LP64)

     __ ld_ptr(SP,(frame::register_save_words+0)*wordSize,L0);

     __ ld_ptr(SP,(frame::register_save_words+1)*wordSize,L1);

     __ ld_ptr(SP,(frame::register_save_words+2)*wordSize,L2);

     __ ld_ptr(SP,(frame::register_save_words+3)*wordSize,L3);

     __ retl();                  // Result in Rret is zero; flags set to Z

     __ delayed()->add(SP,4*wordSize,SP);

 #else

     __ ret();                   // Result in Rret is zero; flags set to Z

     __ delayed()->restore();

 #endif

     // Hit or miss falls through here

     __ BIND(miss);

     __ addcc(G0,1,Rret);        // set NZ flags, NZ result

 #if defined(COMPILER2) && !defined(_LP64)

     __ ld_ptr(SP,(frame::register_save_words+0)*wordSize,L0);

     __ ld_ptr(SP,(frame::register_save_words+1)*wordSize,L1);

     __ ld_ptr(SP,(frame::register_save_words+2)*wordSize,L2);

     __ ld_ptr(SP,(frame::register_save_words+3)*wordSize,L3);

     __ retl();                  // Result in Rret is != 0; flags set to NZ

     __ delayed()->add(SP,4*wordSize,SP);

 #else

     __ ret();                   // Result in Rret is != 0; flags set to NZ

     __ delayed()->restore();

 #endif

     return start;

   }

   // Called from MacroAssembler::verify_oop

   //

   address generate_verify_oop_subroutine() {

     StubCodeMark mark(this, "StubRoutines", "verify_oop_stub");

     address start = __ pc();

     __ verify_oop_subroutine();

     return start;

   }

   static address disjoint_byte_copy_entry;

   static address disjoint_short_copy_entry;

   static address disjoint_int_copy_entry;

   static address disjoint_long_copy_entry;

   static address disjoint_oop_copy_entry;

   static address byte_copy_entry;

   static address short_copy_entry;

   static address int_copy_entry;

   static address long_copy_entry;

   static address oop_copy_entry;

   static address checkcast_copy_entry;

   //

   // Verify that a register contains clean 32-bits positive value

   // (high 32-bits are 0) so it could be used in 64-bits shifts (sllx, srax).

   //

   //  Input:

   //    Rint  -  32-bits value

   //    Rtmp  -  scratch

   //

   void assert_clean_int(Register Rint, Register Rtmp) {

 #if defined(ASSERT) && defined(_LP64)

     __ signx(Rint, Rtmp);

     __ cmp(Rint, Rtmp);

     __ breakpoint_trap(Assembler::notEqual, Assembler::xcc);

 #endif

   }

   //

   //  Generate overlap test for array copy stubs

   //

   //  Input:

   //    O0    -  array1

   //    O1    -  array2

   //    O2    -  element count

   //

   //  Kills temps:  O3, O4

   //

   void array_overlap_test(address no_overlap_target, int log2_elem_size) {

     assert(no_overlap_target != NULL, "must be generated");

     array_overlap_test(no_overlap_target, NULL, log2_elem_size);

   }

   void array_overlap_test(Label& L_no_overlap, int log2_elem_size) {

     array_overlap_test(NULL, &L_no_overlap, log2_elem_size);

   }

   void array_overlap_test(address no_overlap_target, Label* NOLp, int log2_elem_size) {

     const Register from       = O0;

     const Register to         = O1;

     const Register count      = O2;

     const Register to_from    = O3; // to - from

     const Register byte_count = O4; // count << log2_elem_size

       __ subcc(to, from, to_from);

       __ sll_ptr(count, log2_elem_size, byte_count);

       if (NOLp == NULL)

         __ brx(Assembler::lessEqualUnsigned, false, Assembler::pt, no_overlap_target);

       else

         __ brx(Assembler::lessEqualUnsigned, false, Assembler::pt, (*NOLp));

       __ delayed()->cmp(to_from, byte_count);

       if (NOLp == NULL)

         __ brx(Assembler::greaterEqual, false, Assembler::pt, no_overlap_target);

       else

         __ brx(Assembler::greaterEqual, false, Assembler::pt, (*NOLp));

       __ delayed()->nop();

   }

   //

   //  Generate pre-write barrier for array.

   //

   //  Input:

   //     addr     - register containing starting address

   //     count    - register containing element count

   //     tmp      - scratch register

   //

   //  The input registers are overwritten.

   //

   void gen_write_ref_array_pre_barrier(Register addr, Register count) {

     BarrierSet* bs = Universe::heap()->barrier_set();

     if (bs->has_write_ref_pre_barrier()) {

       assert(bs->has_write_ref_array_pre_opt(),

              "Else unsupported barrier set.");

       __ save_frame(0);

       // Save the necessary global regs... will be used after.

       if (addr->is_global()) {

         __ mov(addr, L0);

       }

       if (count->is_global()) {

         __ mov(count, L1);

       }

       __ mov(addr->after_save(), O0);

       // Get the count into O1

       __ call(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_pre));

       __ delayed()->mov(count->after_save(), O1);

       if (addr->is_global()) {

         __ mov(L0, addr);

       }

       if (count->is_global()) {

         __ mov(L1, count);

       }

       __ restore();

     }

   }

   //

   //  Generate post-write barrier for array.

   //

   //  Input:

   //     addr     - register containing starting address

   //     count    - register containing element count

   //     tmp      - scratch register

   //

   //  The input registers are overwritten.

   //

   void gen_write_ref_array_post_barrier(Register addr, Register count,

                                    Register tmp) {

     BarrierSet* bs = Universe::heap()->barrier_set();

     switch (bs->kind()) {

       case BarrierSet::G1SATBCT:

       case BarrierSet::G1SATBCTLogging:

         {

           // Get some new fresh output registers.

           __ save_frame(0);

           __ mov(addr->after_save(), O0);

           __ call(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_post));

           __ delayed()->mov(count->after_save(), O1);

           __ restore();

         }

         break;

       case BarrierSet::CardTableModRef:

       case BarrierSet::CardTableExtension:

         {

           CardTableModRefBS* ct = (CardTableModRefBS*)bs;

           assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code");

           assert_different_registers(addr, count, tmp);

           Label L_loop;

           __ sll_ptr(count, LogBytesPerHeapOop, count);

           __ sub(count, BytesPerHeapOop, count);

           __ add(count, addr, count);

           // Use two shifts to clear out those low order two bits! (Cannot opt. into 1.)

           __ srl_ptr(addr, CardTableModRefBS::card_shift, addr);

           __ srl_ptr(count, CardTableModRefBS::card_shift, count);

           __ sub(count, addr, count);

           Address rs(tmp, (address)ct->byte_map_base);

           __ load_address(rs);

         __ BIND(L_loop);

           __ stb(G0, rs.base(), addr);

           __ subcc(count, 1, count);

           __ brx(Assembler::greaterEqual, false, Assembler::pt, L_loop);

           __ delayed()->add(addr, 1, addr);

           }

         break;

       case BarrierSet::ModRef:

         break;

       default      :

         ShouldNotReachHere();

     }

   }

   // Copy big chunks forward with shift

   //

   // Inputs:

   //   from      - source arrays

   //   to        - destination array aligned to 8-bytes

   //   count     - elements count to copy >= the count equivalent to 16 bytes

   //   count_dec - elements count's decrement equivalent to 16 bytes

   //   L_copy_bytes - copy exit label

   //

   void copy_16_bytes_forward_with_shift(Register from, Register to,

                      Register count, int count_dec, Label& L_copy_bytes) {

     Label L_loop, L_aligned_copy, L_copy_last_bytes;

     // if both arrays have the same alignment mod 8, do 8 bytes aligned copy

       __ andcc(from, 7, G1); // misaligned bytes

       __ br(Assembler::zero, false, Assembler::pt, L_aligned_copy);

       __ delayed()->nop();

     const Register left_shift  = G1; // left  shift bit counter

     const Register right_shift = G5; // right shift bit counter

       __ sll(G1, LogBitsPerByte, left_shift);

       __ mov(64, right_shift);

       __ sub(right_shift, left_shift, right_shift);

     //

     // Load 2 aligned 8-bytes chunks and use one from previous iteration

     // to form 2 aligned 8-bytes chunks to store.

     //

       __ deccc(count, count_dec); // Pre-decrement 'count'

       __ andn(from, 7, from);     // Align address

       __ ldx(from, 0, O3);

       __ inc(from, 8);

       __ align(16);

     __ BIND(L_loop);

       __ ldx(from, 0, O4);

       __ deccc(count, count_dec); // Can we do next iteration after this one?

       __ ldx(from, 8, G4);

       __ inc(to, 16);

       __ inc(from, 16);

       __ sllx(O3, left_shift,  O3);

       __ srlx(O4, right_shift, G3);

       __ bset(G3, O3);

       __ stx(O3, to, -16);

       __ sllx(O4, left_shift,  O4);

       __ srlx(G4, right_shift, G3);

       __ bset(G3, O4);

       __ stx(O4, to, -8);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_loop);

       __ delayed()->mov(G4, O3);

       __ inccc(count, count_dec>>1 ); // + 8 bytes

       __ brx(Assembler::negative, true, Assembler::pn, L_copy_last_bytes);

       __ delayed()->inc(count, count_dec>>1); // restore 'count'

       // copy 8 bytes, part of them already loaded in O3

       __ ldx(from, 0, O4);

       __ inc(to, 8);

       __ inc(from, 8);

       __ sllx(O3, left_shift,  O3);

       __ srlx(O4, right_shift, G3);

       __ bset(O3, G3);

       __ stx(G3, to, -8);

     __ BIND(L_copy_last_bytes);

       __ srl(right_shift, LogBitsPerByte, right_shift); // misaligned bytes

       __ br(Assembler::always, false, Assembler::pt, L_copy_bytes);

       __ delayed()->sub(from, right_shift, from);       // restore address

     __ BIND(L_aligned_copy);

   }

   // Copy big chunks backward with shift

   //

   // Inputs:

   //   end_from  - source arrays end address

   //   end_to    - destination array end address aligned to 8-bytes

   //   count     - elements count to copy >= the count equivalent to 16 bytes

   //   count_dec - elements count's decrement equivalent to 16 bytes

   //   L_aligned_copy - aligned copy exit label

   //   L_copy_bytes   - copy exit label

   //

   void copy_16_bytes_backward_with_shift(Register end_from, Register end_to,

                      Register count, int count_dec,

                      Label& L_aligned_copy, Label& L_copy_bytes) {

     Label L_loop, L_copy_last_bytes;

     // if both arrays have the same alignment mod 8, do 8 bytes aligned copy

       __ andcc(end_from, 7, G1); // misaligned bytes

       __ br(Assembler::zero, false, Assembler::pt, L_aligned_copy);

       __ delayed()->deccc(count, count_dec); // Pre-decrement 'count'

     const Register left_shift  = G1; // left  shift bit counter

     const Register right_shift = G5; // right shift bit counter

       __ sll(G1, LogBitsPerByte, left_shift);

       __ mov(64, right_shift);

       __ sub(right_shift, left_shift, right_shift);

     //

     // Load 2 aligned 8-bytes chunks and use one from previous iteration

     // to form 2 aligned 8-bytes chunks to store.

     //

       __ andn(end_from, 7, end_from);     // Align address

       __ ldx(end_from, 0, O3);

       __ align(16);

     __ BIND(L_loop);

       __ ldx(end_from, -8, O4);

       __ deccc(count, count_dec); // Can we do next iteration after this one?

       __ ldx(end_from, -16, G4);

       __ dec(end_to, 16);

       __ dec(end_from, 16);

       __ srlx(O3, right_shift, O3);

       __ sllx(O4, left_shift,  G3);

       __ bset(G3, O3);

       __ stx(O3, end_to, 8);

       __ srlx(O4, right_shift, O4);

       __ sllx(G4, left_shift,  G3);

       __ bset(G3, O4);

       __ stx(O4, end_to, 0);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_loop);

       __ delayed()->mov(G4, O3);

       __ inccc(count, count_dec>>1 ); // + 8 bytes

       __ brx(Assembler::negative, true, Assembler::pn, L_copy_last_bytes);

       __ delayed()->inc(count, count_dec>>1); // restore 'count'

       // copy 8 bytes, part of them already loaded in O3

       __ ldx(end_from, -8, O4);

       __ dec(end_to, 8);

       __ dec(end_from, 8);

       __ srlx(O3, right_shift, O3);

       __ sllx(O4, left_shift,  G3);

       __ bset(O3, G3);

       __ stx(G3, end_to, 0);

     __ BIND(L_copy_last_bytes);

       __ srl(left_shift, LogBitsPerByte, left_shift);    // misaligned bytes

       __ br(Assembler::always, false, Assembler::pt, L_copy_bytes);

       __ delayed()->add(end_from, left_shift, end_from); // restore address

   }

   //

   //  Generate stub for disjoint byte copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_disjoint_byte_copy(bool aligned, const char * name) {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     Label L_skip_alignment, L_align;

     Label L_copy_byte, L_copy_byte_loop, L_exit;

     const Register from      = O0;   // source array address

     const Register to        = O1;   // destination array address

     const Register count     = O2;   // elements count

     const Register offset    = O5;   // offset from start of arrays

     // O3, O4, G3, G4 are used as temp registers

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  disjoint_byte_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     // for short arrays, just do single element copy

     __ cmp(count, 23); // 16 + 7

     __ brx(Assembler::less, false, Assembler::pn, L_copy_byte);

     __ delayed()->mov(G0, offset);

     if (aligned) {

       // 'aligned' == true when it is known statically during compilation

       // of this arraycopy call site that both 'from' and 'to' addresses

       // are HeapWordSize aligned (see LibraryCallKit::basictype2arraycopy()).

       //

       // Aligned arrays have 4 bytes alignment in 32-bits VM

       // and 8 bytes - in 64-bits VM. So we do it only for 32-bits VM

       //

 #ifndef _LP64

       // copy a 4-bytes word if necessary to align 'to' to 8 bytes

       __ andcc(to, 7, G0);

       __ br(Assembler::zero, false, Assembler::pn, L_skip_alignment);

       __ delayed()->ld(from, 0, O3);

       __ inc(from, 4);

       __ inc(to, 4);

       __ dec(count, 4);

       __ st(O3, to, -4);

     __ BIND(L_skip_alignment);

 #endif

     } else {

       // copy bytes to align 'to' on 8 byte boundary

       __ andcc(to, 7, G1); // misaligned bytes

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->neg(G1);

       __ inc(G1, 8);       // bytes need to copy to next 8-bytes alignment

       __ sub(count, G1, count);

     __ BIND(L_align);

       __ ldub(from, 0, O3);

       __ deccc(G1);

       __ inc(from);

       __ stb(O3, to, 0);

       __ br(Assembler::notZero, false, Assembler::pt, L_align);

       __ delayed()->inc(to);

     __ BIND(L_skip_alignment);

     }

 #ifdef _LP64

     if (!aligned)

 #endif

     {

       // Copy with shift 16 bytes per iteration if arrays do not have

       // the same alignment mod 8, otherwise fall through to the next

       // code for aligned copy.

       // The compare above (count >= 23) guarantes 'count' >= 16 bytes.

       // Also jump over aligned copy after the copy with shift completed.

       copy_16_bytes_forward_with_shift(from, to, count, 16, L_copy_byte);

     }

     // Both array are 8 bytes aligned, copy 16 bytes at a time

       __ and3(count, 7, G4); // Save count

       __ srl(count, 3, count);

      generate_disjoint_long_copy_core(aligned);

       __ mov(G4, count);     // Restore count

     // copy tailing bytes

     __ BIND(L_copy_byte);

       __ br_zero(Assembler::zero, false, Assembler::pt, count, L_exit);

       __ delayed()->nop();

       __ align(16);

     __ BIND(L_copy_byte_loop);

       __ ldub(from, offset, O3);

       __ deccc(count);

       __ stb(O3, to, offset);

       __ brx(Assembler::notZero, false, Assembler::pt, L_copy_byte_loop);

       __ delayed()->inc(offset);

     __ BIND(L_exit);

       // O3, O4 are used as temp registers

       inc_counter_np(SharedRuntime::_jbyte_array_copy_ctr, O3, O4);

       __ retl();

       __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate stub for conjoint byte copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_conjoint_byte_copy(bool aligned, const char * name) {

     // Do reverse copy.

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     address nooverlap_target = aligned ?

         StubRoutines::arrayof_jbyte_disjoint_arraycopy() :

         disjoint_byte_copy_entry;

     Label L_skip_alignment, L_align, L_aligned_copy;

     Label L_copy_byte, L_copy_byte_loop, L_exit;

     const Register from      = O0;   // source array address

     const Register to        = O1;   // destination array address

     const Register count     = O2;   // elements count

     const Register end_from  = from; // source array end address

     const Register end_to    = to;   // destination array end address

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  byte_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     array_overlap_test(nooverlap_target, 0);

     __ add(to, count, end_to);       // offset after last copied element

     // for short arrays, just do single element copy

     __ cmp(count, 23); // 16 + 7

     __ brx(Assembler::less, false, Assembler::pn, L_copy_byte);

     __ delayed()->add(from, count, end_from);

     {

       // Align end of arrays since they could be not aligned even

       // when arrays itself are aligned.

       // copy bytes to align 'end_to' on 8 byte boundary

       __ andcc(end_to, 7, G1); // misaligned bytes

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->nop();

       __ sub(count, G1, count);

     __ BIND(L_align);

       __ dec(end_from);

       __ dec(end_to);

       __ ldub(end_from, 0, O3);

       __ deccc(G1);

       __ brx(Assembler::notZero, false, Assembler::pt, L_align);

       __ delayed()->stb(O3, end_to, 0);

     __ BIND(L_skip_alignment);

     }

 #ifdef _LP64

     if (aligned) {

       // Both arrays are aligned to 8-bytes in 64-bits VM.

       // The 'count' is decremented in copy_16_bytes_backward_with_shift()

       // in unaligned case.

       __ dec(count, 16);

     } else

 #endif

     {

       // Copy with shift 16 bytes per iteration if arrays do not have

       // the same alignment mod 8, otherwise jump to the next

       // code for aligned copy (and substracting 16 from 'count' before jump).

       // The compare above (count >= 11) guarantes 'count' >= 16 bytes.

       // Also jump over aligned copy after the copy with shift completed.

       copy_16_bytes_backward_with_shift(end_from, end_to, count, 16,

                                         L_aligned_copy, L_copy_byte);

     }

     // copy 4 elements (16 bytes) at a time

       __ align(16);

     __ BIND(L_aligned_copy);

       __ dec(end_from, 16);

       __ ldx(end_from, 8, O3);

       __ ldx(end_from, 0, O4);

       __ dec(end_to, 16);

       __ deccc(count, 16);

       __ stx(O3, end_to, 8);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_aligned_copy);

       __ delayed()->stx(O4, end_to, 0);

       __ inc(count, 16);

     // copy 1 element (2 bytes) at a time

     __ BIND(L_copy_byte);

       __ br_zero(Assembler::zero, false, Assembler::pt, count, L_exit);

       __ delayed()->nop();

       __ align(16);

     __ BIND(L_copy_byte_loop);

       __ dec(end_from);

       __ dec(end_to);

       __ ldub(end_from, 0, O4);

       __ deccc(count);

       __ brx(Assembler::greater, false, Assembler::pt, L_copy_byte_loop);

       __ delayed()->stb(O4, end_to, 0);

     __ BIND(L_exit);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_jbyte_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate stub for disjoint short copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_disjoint_short_copy(bool aligned, const char * name) {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     Label L_skip_alignment, L_skip_alignment2;

     Label L_copy_2_bytes, L_copy_2_bytes_loop, L_exit;

     const Register from      = O0;   // source array address

     const Register to        = O1;   // destination array address

     const Register count     = O2;   // elements count

     const Register offset    = O5;   // offset from start of arrays

     // O3, O4, G3, G4 are used as temp registers

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  disjoint_short_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     // for short arrays, just do single element copy

     __ cmp(count, 11); // 8 + 3  (22 bytes)

     __ brx(Assembler::less, false, Assembler::pn, L_copy_2_bytes);

     __ delayed()->mov(G0, offset);

     if (aligned) {

       // 'aligned' == true when it is known statically during compilation

       // of this arraycopy call site that both 'from' and 'to' addresses

       // are HeapWordSize aligned (see LibraryCallKit::basictype2arraycopy()).

       //

       // Aligned arrays have 4 bytes alignment in 32-bits VM

       // and 8 bytes - in 64-bits VM.

       //

 #ifndef _LP64

       // copy a 2-elements word if necessary to align 'to' to 8 bytes

       __ andcc(to, 7, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->ld(from, 0, O3);

       __ inc(from, 4);

       __ inc(to, 4);

       __ dec(count, 2);

       __ st(O3, to, -4);

     __ BIND(L_skip_alignment);

 #endif

     } else {

       // copy 1 element if necessary to align 'to' on an 4 bytes

       __ andcc(to, 3, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->lduh(from, 0, O3);

       __ inc(from, 2);

       __ inc(to, 2);

       __ dec(count);

       __ sth(O3, to, -2);

     __ BIND(L_skip_alignment);

       // copy 2 elements to align 'to' on an 8 byte boundary

       __ andcc(to, 7, G0);

       __ br(Assembler::zero, false, Assembler::pn, L_skip_alignment2);

       __ delayed()->lduh(from, 0, O3);

       __ dec(count, 2);

       __ lduh(from, 2, O4);

       __ inc(from, 4);

       __ inc(to, 4);

       __ sth(O3, to, -4);

       __ sth(O4, to, -2);

     __ BIND(L_skip_alignment2);

     }

 #ifdef _LP64

     if (!aligned)

 #endif

     {

       // Copy with shift 16 bytes per iteration if arrays do not have

       // the same alignment mod 8, otherwise fall through to the next

       // code for aligned copy.

       // The compare above (count >= 11) guarantes 'count' >= 16 bytes.

       // Also jump over aligned copy after the copy with shift completed.

       copy_16_bytes_forward_with_shift(from, to, count, 8, L_copy_2_bytes);

     }

     // Both array are 8 bytes aligned, copy 16 bytes at a time

       __ and3(count, 3, G4); // Save

       __ srl(count, 2, count);

      generate_disjoint_long_copy_core(aligned);

       __ mov(G4, count); // restore

     // copy 1 element at a time

     __ BIND(L_copy_2_bytes);

       __ br_zero(Assembler::zero, false, Assembler::pt, count, L_exit);

       __ delayed()->nop();

       __ align(16);

     __ BIND(L_copy_2_bytes_loop);

       __ lduh(from, offset, O3);

       __ deccc(count);

       __ sth(O3, to, offset);

       __ brx(Assembler::notZero, false, Assembler::pt, L_copy_2_bytes_loop);

       __ delayed()->inc(offset, 2);

     __ BIND(L_exit);

       // O3, O4 are used as temp registers

       inc_counter_np(SharedRuntime::_jshort_array_copy_ctr, O3, O4);

       __ retl();

       __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate stub for conjoint short copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_conjoint_short_copy(bool aligned, const char * name) {

     // Do reverse copy.

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     address nooverlap_target = aligned ?

         StubRoutines::arrayof_jshort_disjoint_arraycopy() :

         disjoint_short_copy_entry;

     Label L_skip_alignment, L_skip_alignment2, L_aligned_copy;

     Label L_copy_2_bytes, L_copy_2_bytes_loop, L_exit;

     const Register from      = O0;   // source array address

     const Register to        = O1;   // destination array address

     const Register count     = O2;   // elements count

     const Register end_from  = from; // source array end address

     const Register end_to    = to;   // destination array end address

     const Register byte_count = O3;  // bytes count to copy

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  short_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     array_overlap_test(nooverlap_target, 1);

     __ sllx(count, LogBytesPerShort, byte_count);

     __ add(to, byte_count, end_to);  // offset after last copied element

     // for short arrays, just do single element copy

     __ cmp(count, 11); // 8 + 3  (22 bytes)

     __ brx(Assembler::less, false, Assembler::pn, L_copy_2_bytes);

     __ delayed()->add(from, byte_count, end_from);

     {

       // Align end of arrays since they could be not aligned even

       // when arrays itself are aligned.

       // copy 1 element if necessary to align 'end_to' on an 4 bytes

       __ andcc(end_to, 3, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->lduh(end_from, -2, O3);

       __ dec(end_from, 2);

       __ dec(end_to, 2);

       __ dec(count);

       __ sth(O3, end_to, 0);

     __ BIND(L_skip_alignment);

       // copy 2 elements to align 'end_to' on an 8 byte boundary

       __ andcc(end_to, 7, G0);

       __ br(Assembler::zero, false, Assembler::pn, L_skip_alignment2);

       __ delayed()->lduh(end_from, -2, O3);

       __ dec(count, 2);

       __ lduh(end_from, -4, O4);

       __ dec(end_from, 4);

       __ dec(end_to, 4);

       __ sth(O3, end_to, 2);

       __ sth(O4, end_to, 0);

     __ BIND(L_skip_alignment2);

     }

 #ifdef _LP64

     if (aligned) {

       // Both arrays are aligned to 8-bytes in 64-bits VM.

       // The 'count' is decremented in copy_16_bytes_backward_with_shift()

       // in unaligned case.

       __ dec(count, 8);

     } else

 #endif

     {

       // Copy with shift 16 bytes per iteration if arrays do not have

       // the same alignment mod 8, otherwise jump to the next

       // code for aligned copy (and substracting 8 from 'count' before jump).

       // The compare above (count >= 11) guarantes 'count' >= 16 bytes.

       // Also jump over aligned copy after the copy with shift completed.

       copy_16_bytes_backward_with_shift(end_from, end_to, count, 8,

                                         L_aligned_copy, L_copy_2_bytes);

     }

     // copy 4 elements (16 bytes) at a time

       __ align(16);

     __ BIND(L_aligned_copy);

       __ dec(end_from, 16);

       __ ldx(end_from, 8, O3);

       __ ldx(end_from, 0, O4);

       __ dec(end_to, 16);

       __ deccc(count, 8);

       __ stx(O3, end_to, 8);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_aligned_copy);

       __ delayed()->stx(O4, end_to, 0);

       __ inc(count, 8);

     // copy 1 element (2 bytes) at a time

     __ BIND(L_copy_2_bytes);

       __ br_zero(Assembler::zero, false, Assembler::pt, count, L_exit);

       __ delayed()->nop();

     __ BIND(L_copy_2_bytes_loop);

       __ dec(end_from, 2);

       __ dec(end_to, 2);

       __ lduh(end_from, 0, O4);

       __ deccc(count);

       __ brx(Assembler::greater, false, Assembler::pt, L_copy_2_bytes_loop);

       __ delayed()->sth(O4, end_to, 0);

     __ BIND(L_exit);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_jshort_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate core code for disjoint int copy (and oop copy on 32-bit).

   //  If "aligned" is true, the "from" and "to" addresses are assumed

   //  to be heapword aligned.

   //

   // Arguments:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   void generate_disjoint_int_copy_core(bool aligned) {

     Label L_skip_alignment, L_aligned_copy;

     Label L_copy_16_bytes,  L_copy_4_bytes, L_copy_4_bytes_loop, L_exit;

     const Register from      = O0;   // source array address

     const Register to        = O1;   // destination array address

     const Register count     = O2;   // elements count

     const Register offset    = O5;   // offset from start of arrays

     // O3, O4, G3, G4 are used as temp registers

     // 'aligned' == true when it is known statically during compilation

     // of this arraycopy call site that both 'from' and 'to' addresses

     // are HeapWordSize aligned (see LibraryCallKit::basictype2arraycopy()).

     //

     // Aligned arrays have 4 bytes alignment in 32-bits VM

     // and 8 bytes - in 64-bits VM.

     //

 #ifdef _LP64

     if (!aligned)

 #endif

     {

       // The next check could be put under 'ifndef' since the code in

       // generate_disjoint_long_copy_core() has own checks and set 'offset'.

       // for short arrays, just do single element copy

       __ cmp(count, 5); // 4 + 1 (20 bytes)

       __ brx(Assembler::lessEqual, false, Assembler::pn, L_copy_4_bytes);

       __ delayed()->mov(G0, offset);

       // copy 1 element to align 'to' on an 8 byte boundary

       __ andcc(to, 7, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->ld(from, 0, O3);

       __ inc(from, 4);

       __ inc(to, 4);

       __ dec(count);

       __ st(O3, to, -4);

     __ BIND(L_skip_alignment);

     // if arrays have same alignment mod 8, do 4 elements copy

       __ andcc(from, 7, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_aligned_copy);

       __ delayed()->ld(from, 0, O3);

     //

     // Load 2 aligned 8-bytes chunks and use one from previous iteration

     // to form 2 aligned 8-bytes chunks to store.

     //

     // copy_16_bytes_forward_with_shift() is not used here since this

     // code is more optimal.

     // copy with shift 4 elements (16 bytes) at a time

       __ dec(count, 4);   // The cmp at the beginning guaranty count >= 4

       __ align(16);

     __ BIND(L_copy_16_bytes);

       __ ldx(from, 4, O4);

       __ deccc(count, 4); // Can we do next iteration after this one?

       __ ldx(from, 12, G4);

       __ inc(to, 16);

       __ inc(from, 16);

       __ sllx(O3, 32, O3);

       __ srlx(O4, 32, G3);

       __ bset(G3, O3);

       __ stx(O3, to, -16);

       __ sllx(O4, 32, O4);

       __ srlx(G4, 32, G3);

       __ bset(G3, O4);

       __ stx(O4, to, -8);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_copy_16_bytes);

       __ delayed()->mov(G4, O3);

       __ br(Assembler::always, false, Assembler::pt, L_copy_4_bytes);

       __ delayed()->inc(count, 4); // restore 'count'

     __ BIND(L_aligned_copy);

     }

     // copy 4 elements (16 bytes) at a time

       __ and3(count, 1, G4); // Save

       __ srl(count, 1, count);

      generate_disjoint_long_copy_core(aligned);

       __ mov(G4, count);     // Restore

     // copy 1 element at a time

     __ BIND(L_copy_4_bytes);

       __ br_zero(Assembler::zero, false, Assembler::pt, count, L_exit);

       __ delayed()->nop();

     __ BIND(L_copy_4_bytes_loop);

       __ ld(from, offset, O3);

       __ deccc(count);

       __ st(O3, to, offset);

       __ brx(Assembler::notZero, false, Assembler::pt, L_copy_4_bytes_loop);

       __ delayed()->inc(offset, 4);

     __ BIND(L_exit);

   }

   //

   //  Generate stub for disjoint int copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_disjoint_int_copy(bool aligned, const char * name) {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     const Register count = O2;

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  disjoint_int_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     generate_disjoint_int_copy_core(aligned);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_jint_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate core code for conjoint int copy (and oop copy on 32-bit).

   //  If "aligned" is true, the "from" and "to" addresses are assumed

   //  to be heapword aligned.

   //

   // Arguments:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   void generate_conjoint_int_copy_core(bool aligned) {

     // Do reverse copy.

     Label L_skip_alignment, L_aligned_copy;

     Label L_copy_16_bytes,  L_copy_4_bytes, L_copy_4_bytes_loop, L_exit;

     const Register from      = O0;   // source array address

     const Register to        = O1;   // destination array address

     const Register count     = O2;   // elements count

     const Register end_from  = from; // source array end address

     const Register end_to    = to;   // destination array end address

     // O3, O4, O5, G3 are used as temp registers

     const Register byte_count = O3;  // bytes count to copy

       __ sllx(count, LogBytesPerInt, byte_count);

       __ add(to, byte_count, end_to); // offset after last copied element

       __ cmp(count, 5); // for short arrays, just do single element copy

       __ brx(Assembler::lessEqual, false, Assembler::pn, L_copy_4_bytes);

       __ delayed()->add(from, byte_count, end_from);

     // copy 1 element to align 'to' on an 8 byte boundary

       __ andcc(end_to, 7, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_skip_alignment);

       __ delayed()->nop();

       __ dec(count);

       __ dec(end_from, 4);

       __ dec(end_to,   4);

       __ ld(end_from, 0, O4);

       __ st(O4, end_to, 0);

     __ BIND(L_skip_alignment);

     // Check if 'end_from' and 'end_to' has the same alignment.

       __ andcc(end_from, 7, G0);

       __ br(Assembler::zero, false, Assembler::pt, L_aligned_copy);

       __ delayed()->dec(count, 4); // The cmp at the start guaranty cnt >= 4

     // copy with shift 4 elements (16 bytes) at a time

     //

     // Load 2 aligned 8-bytes chunks and use one from previous iteration

     // to form 2 aligned 8-bytes chunks to store.

     //

       __ ldx(end_from, -4, O3);

       __ align(16);

     __ BIND(L_copy_16_bytes);

       __ ldx(end_from, -12, O4);

       __ deccc(count, 4);

       __ ldx(end_from, -20, O5);

       __ dec(end_to, 16);

       __ dec(end_from, 16);

       __ srlx(O3, 32, O3);

       __ sllx(O4, 32, G3);

       __ bset(G3, O3);

       __ stx(O3, end_to, 8);

       __ srlx(O4, 32, O4);

       __ sllx(O5, 32, G3);

       __ bset(O4, G3);

       __ stx(G3, end_to, 0);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_copy_16_bytes);

       __ delayed()->mov(O5, O3);

       __ br(Assembler::always, false, Assembler::pt, L_copy_4_bytes);

       __ delayed()->inc(count, 4);

     // copy 4 elements (16 bytes) at a time

       __ align(16);

     __ BIND(L_aligned_copy);

       __ dec(end_from, 16);

       __ ldx(end_from, 8, O3);

       __ ldx(end_from, 0, O4);

       __ dec(end_to, 16);

       __ deccc(count, 4);

       __ stx(O3, end_to, 8);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_aligned_copy);

       __ delayed()->stx(O4, end_to, 0);

       __ inc(count, 4);

     // copy 1 element (4 bytes) at a time

     __ BIND(L_copy_4_bytes);

       __ br_zero(Assembler::zero, false, Assembler::pt, count, L_exit);

       __ delayed()->nop();

     __ BIND(L_copy_4_bytes_loop);

       __ dec(end_from, 4);

       __ dec(end_to, 4);

       __ ld(end_from, 0, O4);

       __ deccc(count);

       __ brx(Assembler::greater, false, Assembler::pt, L_copy_4_bytes_loop);

       __ delayed()->st(O4, end_to, 0);

     __ BIND(L_exit);

   }

   //

   //  Generate stub for conjoint int copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_conjoint_int_copy(bool aligned, const char * name) {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     address nooverlap_target = aligned ?

         StubRoutines::arrayof_jint_disjoint_arraycopy() :

         disjoint_int_copy_entry;

     assert_clean_int(O2, O3);     // Make sure 'count' is clean int.

     if (!aligned)  int_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     array_overlap_test(nooverlap_target, 2);

     generate_conjoint_int_copy_core(aligned);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_jint_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate core code for disjoint long copy (and oop copy on 64-bit).

   //  "aligned" is ignored, because we must make the stronger

   //  assumption that both addresses are always 64-bit aligned.

   //

   // Arguments:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   void generate_disjoint_long_copy_core(bool aligned) {

     Label L_copy_8_bytes, L_copy_16_bytes, L_exit;

     const Register from    = O0;  // source array address

     const Register to      = O1;  // destination array address

     const Register count   = O2;  // elements count

     const Register offset0 = O4;  // element offset

     const Register offset8 = O5;  // next element offset

       __ deccc(count, 2);

       __ mov(G0, offset0);   // offset from start of arrays (0)

       __ brx(Assembler::negative, false, Assembler::pn, L_copy_8_bytes );

       __ delayed()->add(offset0, 8, offset8);

       __ align(16);

     __ BIND(L_copy_16_bytes);

       __ ldx(from, offset0, O3);

       __ ldx(from, offset8, G3);

       __ deccc(count, 2);

       __ stx(O3, to, offset0);

       __ inc(offset0, 16);

       __ stx(G3, to, offset8);

       __ brx(Assembler::greaterEqual, false, Assembler::pt, L_copy_16_bytes);

       __ delayed()->inc(offset8, 16);

     __ BIND(L_copy_8_bytes);

       __ inccc(count, 2);

       __ brx(Assembler::zero, true, Assembler::pn, L_exit );

       __ delayed()->mov(offset0, offset8); // Set O5 used by other stubs

       __ ldx(from, offset0, O3);

       __ stx(O3, to, offset0);

     __ BIND(L_exit);

   }

   //

   //  Generate stub for disjoint long copy.

   //  "aligned" is ignored, because we must make the stronger

   //  assumption that both addresses are always 64-bit aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_disjoint_long_copy(bool aligned, const char * name) {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     assert_clean_int(O2, O3);     // Make sure 'count' is clean int.

     if (!aligned)  disjoint_long_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     generate_disjoint_long_copy_core(aligned);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_jlong_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //

   //  Generate core code for conjoint long copy (and oop copy on 64-bit).

   //  "aligned" is ignored, because we must make the stronger

   //  assumption that both addresses are always 64-bit aligned.

   //

   // Arguments:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   void generate_conjoint_long_copy_core(bool aligned) {

     // Do reverse copy.

     Label L_copy_8_bytes, L_copy_16_bytes, L_exit;

     const Register from    = O0;  // source array address

     const Register to      = O1;  // destination array address

     const Register count   = O2;  // elements count

     const Register offset8 = O4;  // element offset

     const Register offset0 = O5;  // previous element offset

       __ subcc(count, 1, count);

       __ brx(Assembler::lessEqual, false, Assembler::pn, L_copy_8_bytes );

       __ delayed()->sllx(count, LogBytesPerLong, offset8);

       __ sub(offset8, 8, offset0);

       __ align(16);

     __ BIND(L_copy_16_bytes);

       __ ldx(from, offset8, O2);

       __ ldx(from, offset0, O3);

       __ stx(O2, to, offset8);

       __ deccc(offset8, 16);      // use offset8 as counter

       __ stx(O3, to, offset0);

       __ brx(Assembler::greater, false, Assembler::pt, L_copy_16_bytes);

       __ delayed()->dec(offset0, 16);

     __ BIND(L_copy_8_bytes);

       __ brx(Assembler::negative, false, Assembler::pn, L_exit );

       __ delayed()->nop();

       __ ldx(from, 0, O3);

       __ stx(O3, to, 0);

     __ BIND(L_exit);

   }

   //  Generate stub for conjoint long copy.

   //  "aligned" is ignored, because we must make the stronger

   //  assumption that both addresses are always 64-bit aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_conjoint_long_copy(bool aligned, const char * name) {

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     assert(!aligned, "usage");

     address nooverlap_target = disjoint_long_copy_entry;

     assert_clean_int(O2, O3);     // Make sure 'count' is clean int.

     if (!aligned)  long_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from Unsafe.copyMemory)

     if (!aligned)  BLOCK_COMMENT("Entry:");

     array_overlap_test(nooverlap_target, 3);

     generate_conjoint_long_copy_core(aligned);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_jlong_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //  Generate stub for disjoint oop copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_disjoint_oop_copy(bool aligned, const char * name) {

     const Register from  = O0;  // source array address

     const Register to    = O1;  // destination array address

     const Register count = O2;  // elements count

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  disjoint_oop_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here

     if (!aligned)  BLOCK_COMMENT("Entry:");

     // save arguments for barrier generation

     __ mov(to, G1);

     __ mov(count, G5);

     gen_write_ref_array_pre_barrier(G1, G5);

   #ifdef _LP64

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (UseCompressedOops) {

       generate_disjoint_int_copy_core(aligned);

     } else {

       generate_disjoint_long_copy_core(aligned);

     }

   #else

     generate_disjoint_int_copy_core(aligned);

   #endif

     // O0 is used as temp register

     gen_write_ref_array_post_barrier(G1, G5, O0);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_oop_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   //  Generate stub for conjoint oop copy.  If "aligned" is true, the

   //  "from" and "to" addresses are assumed to be heapword aligned.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //

   address generate_conjoint_oop_copy(bool aligned, const char * name) {

     const Register from  = O0;  // source array address

     const Register to    = O1;  // destination array address

     const Register count = O2;  // elements count

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     assert_clean_int(count, O3);     // Make sure 'count' is clean int.

     if (!aligned)  oop_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here

     if (!aligned)  BLOCK_COMMENT("Entry:");

     // save arguments for barrier generation

     __ mov(to, G1);

     __ mov(count, G5);

     gen_write_ref_array_pre_barrier(G1, G5);

     address nooverlap_target = aligned ?

         StubRoutines::arrayof_oop_disjoint_arraycopy() :

         disjoint_oop_copy_entry;

     array_overlap_test(nooverlap_target, LogBytesPerHeapOop);

   #ifdef _LP64

     if (UseCompressedOops) {

       generate_conjoint_int_copy_core(aligned);

     } else {

       generate_conjoint_long_copy_core(aligned);

     }

   #else

     generate_conjoint_int_copy_core(aligned);

   #endif

     // O0 is used as temp register

     gen_write_ref_array_post_barrier(G1, G5, O0);

     // O3, O4 are used as temp registers

     inc_counter_np(SharedRuntime::_oop_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->mov(G0, O0); // return 0

     return start;

   }

   // Helper for generating a dynamic type check.

   // Smashes only the given temp registers.

   void generate_type_check(Register sub_klass,

                            Register super_check_offset,

                            Register super_klass,

                            Register temp,

                            Label& L_success,

                            Register deccc_hack = noreg) {

     assert_different_registers(sub_klass, super_check_offset, super_klass, temp);

     BLOCK_COMMENT("type_check:");

     Label L_miss;

     assert_clean_int(super_check_offset, temp);

     // maybe decrement caller's trip count:

 #define DELAY_SLOT delayed();   \

     { if (deccc_hack == noreg) __ nop(); else __ deccc(deccc_hack); }

     // if the pointers are equal, we are done (e.g., String[] elements)

     __ cmp(sub_klass, super_klass);

     __ brx(Assembler::equal, true, Assembler::pt, L_success);

     __ DELAY_SLOT;

     // check the supertype display:

     __ ld_ptr(sub_klass, super_check_offset, temp); // query the super type

     __ cmp(super_klass,                      temp); // test the super type

     __ brx(Assembler::equal, true, Assembler::pt, L_success);

     __ DELAY_SLOT;

     int sc_offset = (klassOopDesc::header_size() * HeapWordSize +

                      Klass::secondary_super_cache_offset_in_bytes());

     __ cmp(super_klass, sc_offset);

     __ brx(Assembler::notEqual, true, Assembler::pt, L_miss);

     __ delayed()->nop();

     __ save_frame(0);

     __ mov(sub_klass->after_save(), O1);

     // mov(super_klass->after_save(), O2); //fill delay slot

     assert(StubRoutines::Sparc::_partial_subtype_check != NULL, "order of generation");

     __ call(StubRoutines::Sparc::_partial_subtype_check);

     __ delayed()->mov(super_klass->after_save(), O2);

     __ restore();

     // Upon return, the condition codes are already set.

     __ brx(Assembler::equal, true, Assembler::pt, L_success);

     __ DELAY_SLOT;

 #undef DELAY_SLOT

     // Fall through on failure!

     __ BIND(L_miss);

   }

   //  Generate stub for checked oop copy.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 treated as signed

   //      ckoff: O3 (super_check_offset)

   //      ckval: O4 (super_klass)

   //      ret:   O0 zero for success; (-1^K) where K is partial transfer count

   //

   address generate_checkcast_copy(const char* name) {

     const Register O0_from   = O0;      // source array address

     const Register O1_to     = O1;      // destination array address

     const Register O2_count  = O2;      // elements count

     const Register O3_ckoff  = O3;      // super_check_offset

     const Register O4_ckval  = O4;      // super_klass

     const Register O5_offset = O5;      // loop var, with stride wordSize

     const Register G1_remain = G1;      // loop var, with stride -1

     const Register G3_oop    = G3;      // actual oop copied

     const Register G4_klass  = G4;      // oop._klass

     const Register G5_super  = G5;      // oop._klass._primary_supers[ckval]

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     gen_write_ref_array_pre_barrier(O1, O2);

 #ifdef ASSERT

     // We sometimes save a frame (see partial_subtype_check below).

     // If this will cause trouble, let's fail now instead of later.

     __ save_frame(0);

     __ restore();

 #endif

 #ifdef ASSERT

     // caller guarantees that the arrays really are different

     // otherwise, we would have to make conjoint checks

     { Label L;

       __ mov(O3, G1);           // spill: overlap test smashes O3

       __ mov(O4, G4);           // spill: overlap test smashes O4

       array_overlap_test(L, LogBytesPerHeapOop);

       __ stop("checkcast_copy within a single array");

       __ bind(L);

       __ mov(G1, O3);

       __ mov(G4, O4);

     }

 #endif //ASSERT

     assert_clean_int(O2_count, G1);     // Make sure 'count' is clean int.

     checkcast_copy_entry = __ pc();

     // caller can pass a 64-bit byte count here (from generic stub)

     BLOCK_COMMENT("Entry:");

     Label load_element, store_element, do_card_marks, fail, done;

     __ addcc(O2_count, 0, G1_remain);   // initialize loop index, and test it

     __ brx(Assembler::notZero, false, Assembler::pt, load_element);

     __ delayed()->mov(G0, O5_offset);   // offset from start of arrays

     // Empty array:  Nothing to do.

     inc_counter_np(SharedRuntime::_checkcast_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->set(0, O0);           // return 0 on (trivial) success

     // ======== begin loop ========

     // (Loop is rotated; its entry is load_element.)

     // Loop variables:

     //   (O5 = 0; ; O5 += wordSize) --- offset from src, dest arrays

     //   (O2 = len; O2 != 0; O2--) --- number of oops *remaining*

     //   G3, G4, G5 --- current oop, oop.klass, oop.klass.super

     __ align(16);

     __ bind(store_element);

     // deccc(G1_remain);                // decrement the count (hoisted)

     __ store_heap_oop(G3_oop, O1_to, O5_offset); // store the oop

     __ inc(O5_offset, heapOopSize);     // step to next offset

     __ brx(Assembler::zero, true, Assembler::pt, do_card_marks);

     __ delayed()->set(0, O0);           // return -1 on success

     // ======== loop entry is here ========

     __ bind(load_element);

     __ load_heap_oop(O0_from, O5_offset, G3_oop);  // load the oop

     __ br_null(G3_oop, true, Assembler::pt, store_element);

     __ delayed()->deccc(G1_remain);     // decrement the count

     __ load_klass(G3_oop, G4_klass); // query the object klass

     generate_type_check(G4_klass, O3_ckoff, O4_ckval, G5_super,

                         // branch to this on success:

                         store_element,

                         // decrement this on success:

                         G1_remain);

     // ======== end loop ========

     // It was a real error; we must depend on the caller to finish the job.

     // Register G1 has number of *remaining* oops, O2 number of *total* oops.

     // Emit GC store barriers for the oops we have copied (O2 minus G1),

     // and report their number to the caller.

     __ bind(fail);

     __ subcc(O2_count, G1_remain, O2_count);

     __ brx(Assembler::zero, false, Assembler::pt, done);

     __ delayed()->not1(O2_count, O0);   // report (-1^K) to caller

     __ bind(do_card_marks);

     gen_write_ref_array_post_barrier(O1_to, O2_count, O3);   // store check on O1[0..O2]

     __ bind(done);

     inc_counter_np(SharedRuntime::_checkcast_array_copy_ctr, O3, O4);

     __ retl();

     __ delayed()->nop();             // return value in 00

     return start;

   }

   //  Generate 'unsafe' array copy stub

   //  Though just as safe as the other stubs, it takes an unscaled

   //  size_t argument instead of an element count.

   //

   // Arguments for generated stub:

   //      from:  O0

   //      to:    O1

   //      count: O2 byte count, treated as ssize_t, can be zero

   //

   // Examines the alignment of the operands and dispatches

   // to a long, int, short, or byte copy loop.

   //

   address generate_unsafe_copy(const char* name) {

     const Register O0_from   = O0;      // source array address

     const Register O1_to     = O1;      // destination array address

     const Register O2_count  = O2;      // elements count

     const Register G1_bits   = G1;      // test copy of low bits

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     // bump this on entry, not on exit:

     inc_counter_np(SharedRuntime::_unsafe_array_copy_ctr, G1, G3);

     __ or3(O0_from, O1_to, G1_bits);

     __ or3(O2_count,       G1_bits, G1_bits);

     __ btst(BytesPerLong-1, G1_bits);

     __ br(Assembler::zero, true, Assembler::pt,

           long_copy_entry, relocInfo::runtime_call_type);

     // scale the count on the way out:

     __ delayed()->srax(O2_count, LogBytesPerLong, O2_count);

     __ btst(BytesPerInt-1, G1_bits);

     __ br(Assembler::zero, true, Assembler::pt,

           int_copy_entry, relocInfo::runtime_call_type);

     // scale the count on the way out:

     __ delayed()->srax(O2_count, LogBytesPerInt, O2_count);

     __ btst(BytesPerShort-1, G1_bits);

     __ br(Assembler::zero, true, Assembler::pt,

           short_copy_entry, relocInfo::runtime_call_type);

     // scale the count on the way out:

     __ delayed()->srax(O2_count, LogBytesPerShort, O2_count);

     __ br(Assembler::always, false, Assembler::pt,

           byte_copy_entry, relocInfo::runtime_call_type);

     __ delayed()->nop();

     return start;

   }

   // Perform range checks on the proposed arraycopy.

   // Kills the two temps, but nothing else.

   // Also, clean the sign bits of src_pos and dst_pos.

   void arraycopy_range_checks(Register src,     // source array oop (O0)

                               Register src_pos, // source position (O1)

                               Register dst,     // destination array oo (O2)

                               Register dst_pos, // destination position (O3)

                               Register length,  // length of copy (O4)

                               Register temp1, Register temp2,

                               Label& L_failed) {

     BLOCK_COMMENT("arraycopy_range_checks:");

     //  if (src_pos + length > arrayOop(src)->length() ) FAIL;

     const Register array_length = temp1;  // scratch

     const Register end_pos      = temp2;  // scratch

     // Note:  This next instruction may be in the delay slot of a branch:

     __ add(length, src_pos, end_pos);  // src_pos + length

     __ lduw(src, arrayOopDesc::length_offset_in_bytes(), array_length);

     __ cmp(end_pos, array_length);

     __ br(Assembler::greater, false, Assembler::pn, L_failed);

     //  if (dst_pos + length > arrayOop(dst)->length() ) FAIL;

     __ delayed()->add(length, dst_pos, end_pos); // dst_pos + length

     __ lduw(dst, arrayOopDesc::length_offset_in_bytes(), array_length);

     __ cmp(end_pos, array_length);

     __ br(Assembler::greater, false, Assembler::pn, L_failed);

     // Have to clean up high 32-bits of 'src_pos' and 'dst_pos'.

     // Move with sign extension can be used since they are positive.

     __ delayed()->signx(src_pos, src_pos);

     __ signx(dst_pos, dst_pos);

     BLOCK_COMMENT("arraycopy_range_checks done");

   }

   //

   //  Generate generic array copy stubs

   //

   //  Input:

   //    O0    -  src oop

   //    O1    -  src_pos

   //    O2    -  dst oop

   //    O3    -  dst_pos

   //    O4    -  element count

   //

   //  Output:

   //    O0 ==  0  -  success

   //    O0 == -1  -  need to call System.arraycopy

   //

   address generate_generic_copy(const char *name) {

     Label L_failed, L_objArray;

     // Input registers

     const Register src      = O0;  // source array oop

     const Register src_pos  = O1;  // source position

     const Register dst      = O2;  // destination array oop

     const Register dst_pos  = O3;  // destination position

     const Register length   = O4;  // elements count

     // registers used as temp

     const Register G3_src_klass = G3; // source array klass

     const Register G4_dst_klass = G4; // destination array klass

     const Register G5_lh        = G5; // layout handler

     const Register O5_temp      = O5;

     __ align(CodeEntryAlignment);

     StubCodeMark mark(this, "StubRoutines", name);

     address start = __ pc();

     // bump this on entry, not on exit:

     inc_counter_np(SharedRuntime::_generic_array_copy_ctr, G1, G3);

     // In principle, the int arguments could be dirty.

     //assert_clean_int(src_pos, G1);

     //assert_clean_int(dst_pos, G1);

     //assert_clean_int(length, G1);

     //-----------------------------------------------------------------------

     // Assembler stubs will be used for this call to arraycopy

     // if the following conditions are met:

     //

     // (1) src and dst must not be null.

     // (2) src_pos must not be negative.

     // (3) dst_pos must not be negative.