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 /*

  * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 # include "incls/_precompiled.incl"

 # include "incls/_c1_LIRAssembler_x86.cpp.incl"

 // These masks are used to provide 128-bit aligned bitmasks to the XMM

 // instructions, to allow sign-masking or sign-bit flipping.  They allow

 // fast versions of NegF/NegD and AbsF/AbsD.

 // Note: 'double' and 'long long' have 32-bits alignment on x86.

 static jlong* double_quadword(jlong *adr, jlong lo, jlong hi) {

   // Use the expression (adr)&(~0xF) to provide 128-bits aligned address

   // of 128-bits operands for SSE instructions.

   jlong *operand = (jlong*)(((long)adr)&((long)(~0xF)));

   // Store the value to a 128-bits operand.

   operand[0] = lo;

   operand[1] = hi;

   return operand;

 }

 // Buffer for 128-bits masks used by SSE instructions.

 static jlong fp_signmask_pool[(4+1)*2]; // 4*128bits(data) + 128bits(alignment)

 // Static initialization during VM startup.

 static jlong *float_signmask_pool  = double_quadword(&fp_signmask_pool[1*2], CONST64(0x7FFFFFFF7FFFFFFF), CONST64(0x7FFFFFFF7FFFFFFF));

 static jlong *double_signmask_pool = double_quadword(&fp_signmask_pool[2*2], CONST64(0x7FFFFFFFFFFFFFFF), CONST64(0x7FFFFFFFFFFFFFFF));

 static jlong *float_signflip_pool  = double_quadword(&fp_signmask_pool[3*2], CONST64(0x8000000080000000), CONST64(0x8000000080000000));

 static jlong *double_signflip_pool = double_quadword(&fp_signmask_pool[4*2], CONST64(0x8000000000000000), CONST64(0x8000000000000000));

 NEEDS_CLEANUP // remove this definitions ?

 const Register IC_Klass    = rax;   // where the IC klass is cached

 const Register SYNC_header = rax;   // synchronization header

 const Register SHIFT_count = rcx;   // where count for shift operations must be

 #define __ _masm->

 static void select_different_registers(Register preserve,

                                        Register extra,

                                        Register &tmp1,

                                        Register &tmp2) {

   if (tmp1 == preserve) {

     assert_different_registers(tmp1, tmp2, extra);

     tmp1 = extra;

   } else if (tmp2 == preserve) {

     assert_different_registers(tmp1, tmp2, extra);

     tmp2 = extra;

   }

   assert_different_registers(preserve, tmp1, tmp2);

 }

 static void select_different_registers(Register preserve,

                                        Register extra,

                                        Register &tmp1,

                                        Register &tmp2,

                                        Register &tmp3) {

   if (tmp1 == preserve) {

     assert_different_registers(tmp1, tmp2, tmp3, extra);

     tmp1 = extra;

   } else if (tmp2 == preserve) {

     assert_different_registers(tmp1, tmp2, tmp3, extra);

     tmp2 = extra;

   } else if (tmp3 == preserve) {

     assert_different_registers(tmp1, tmp2, tmp3, extra);

     tmp3 = extra;

   }

   assert_different_registers(preserve, tmp1, tmp2, tmp3);

 }

 bool LIR_Assembler::is_small_constant(LIR_Opr opr) {

   if (opr->is_constant()) {

     LIR_Const* constant = opr->as_constant_ptr();

     switch (constant->type()) {

       case T_INT: {

         return true;

       }

       default:

         return false;

     }

   }

   return false;

 }

 LIR_Opr LIR_Assembler::receiverOpr() {

   return FrameMap::receiver_opr;

 }

 LIR_Opr LIR_Assembler::incomingReceiverOpr() {

   return receiverOpr();

 }

 LIR_Opr LIR_Assembler::osrBufferPointer() {

   return FrameMap::as_pointer_opr(receiverOpr()->as_register());

 }

 //--------------fpu register translations-----------------------

 address LIR_Assembler::float_constant(float f) {

   address const_addr = __ float_constant(f);

   if (const_addr == NULL) {

     bailout("const section overflow");

     return __ code()->consts()->start();

   } else {

     return const_addr;

   }

 }

 address LIR_Assembler::double_constant(double d) {

   address const_addr = __ double_constant(d);

   if (const_addr == NULL) {

     bailout("const section overflow");

     return __ code()->consts()->start();

   } else {

     return const_addr;

   }

 }

 void LIR_Assembler::set_24bit_FPU() {

   __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_24()));

 }

 void LIR_Assembler::reset_FPU() {

   __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));

 }

 void LIR_Assembler::fpop() {

   __ fpop();

 }

 void LIR_Assembler::fxch(int i) {

   __ fxch(i);

 }

 void LIR_Assembler::fld(int i) {

   __ fld_s(i);

 }

 void LIR_Assembler::ffree(int i) {

   __ ffree(i);

 }

 void LIR_Assembler::breakpoint() {

   __ int3();

 }

 void LIR_Assembler::push(LIR_Opr opr) {

   if (opr->is_single_cpu()) {

     __ push_reg(opr->as_register());

   } else if (opr->is_double_cpu()) {

     NOT_LP64(__ push_reg(opr->as_register_hi()));

     __ push_reg(opr->as_register_lo());

   } else if (opr->is_stack()) {

     __ push_addr(frame_map()->address_for_slot(opr->single_stack_ix()));

   } else if (opr->is_constant()) {

     LIR_Const* const_opr = opr->as_constant_ptr();

     if (const_opr->type() == T_OBJECT) {

       __ push_oop(const_opr->as_jobject());

     } else if (const_opr->type() == T_INT) {

       __ push_jint(const_opr->as_jint());

     } else {

       ShouldNotReachHere();

     }

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::pop(LIR_Opr opr) {

   if (opr->is_single_cpu()) {

     __ pop_reg(opr->as_register());

   } else {

     ShouldNotReachHere();

   }

 }

 bool LIR_Assembler::is_literal_address(LIR_Address* addr) {

   return addr->base()->is_illegal() && addr->index()->is_illegal();

 }

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

 Address LIR_Assembler::as_Address(LIR_Address* addr) {

   return as_Address(addr, rscratch1);

 }

 Address LIR_Assembler::as_Address(LIR_Address* addr, Register tmp) {

   if (addr->base()->is_illegal()) {

     assert(addr->index()->is_illegal(), "must be illegal too");

     AddressLiteral laddr((address)addr->disp(), relocInfo::none);

     if (! __ reachable(laddr)) {

       __ movptr(tmp, laddr.addr());

       Address res(tmp, 0);

       return res;

     } else {

       return __ as_Address(laddr);

     }

   }

   Register base = addr->base()->as_pointer_register();

   if (addr->index()->is_illegal()) {

     return Address( base, addr->disp());

   } else if (addr->index()->is_cpu_register()) {

     Register index = addr->index()->as_pointer_register();

     return Address(base, index, (Address::ScaleFactor) addr->scale(), addr->disp());

   } else if (addr->index()->is_constant()) {

     intptr_t addr_offset = (addr->index()->as_constant_ptr()->as_jint() << addr->scale()) + addr->disp();

     assert(Assembler::is_simm32(addr_offset), "must be");

     return Address(base, addr_offset);

   } else {

     Unimplemented();

     return Address();

   }

 }

 Address LIR_Assembler::as_Address_hi(LIR_Address* addr) {

   Address base = as_Address(addr);

   return Address(base._base, base._index, base._scale, base._disp + BytesPerWord);

 }

 Address LIR_Assembler::as_Address_lo(LIR_Address* addr) {

   return as_Address(addr);

 }

 void LIR_Assembler::osr_entry() {

   offsets()->set_value(CodeOffsets::OSR_Entry, code_offset());

   BlockBegin* osr_entry = compilation()->hir()->osr_entry();

   ValueStack* entry_state = osr_entry->state();

   int number_of_locks = entry_state->locks_size();

   // we jump here if osr happens with the interpreter

   // state set up to continue at the beginning of the

   // loop that triggered osr - in particular, we have

   // the following registers setup:

   //

   // rcx: osr buffer

   //

   // build frame

   ciMethod* m = compilation()->method();

   __ build_frame(initial_frame_size_in_bytes());

   // OSR buffer is

   //

   // locals[nlocals-1..0]

   // monitors[0..number_of_locks]

   //

   // locals is a direct copy of the interpreter frame so in the osr buffer

   // so first slot in the local array is the last local from the interpreter

   // and last slot is local[0] (receiver) from the interpreter

   //

   // Similarly with locks. The first lock slot in the osr buffer is the nth lock

   // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock

   // in the interpreter frame (the method lock if a sync method)

   // Initialize monitors in the compiled activation.

   //   rcx: pointer to osr buffer

   //

   // All other registers are dead at this point and the locals will be

   // copied into place by code emitted in the IR.

   Register OSR_buf = osrBufferPointer()->as_pointer_register();

   { assert(frame::interpreter_frame_monitor_size() == BasicObjectLock::size(), "adjust code below");

     int monitor_offset = BytesPerWord * method()->max_locals() +

       (2 * BytesPerWord) * (number_of_locks - 1);

     // SharedRuntime::OSR_migration_begin() packs BasicObjectLocks in

     // the OSR buffer using 2 word entries: first the lock and then

     // the oop.

     for (int i = 0; i < number_of_locks; i++) {

       int slot_offset = monitor_offset - ((i * 2) * BytesPerWord);

 #ifdef ASSERT

       // verify the interpreter's monitor has a non-null object

       {

         Label L;

         __ cmpptr(Address(OSR_buf, slot_offset + 1*BytesPerWord), (int32_t)NULL_WORD);

         __ jcc(Assembler::notZero, L);

         __ stop("locked object is NULL");

         __ bind(L);

       }

 #endif

       __ movptr(rbx, Address(OSR_buf, slot_offset + 0));

       __ movptr(frame_map()->address_for_monitor_lock(i), rbx);

       __ movptr(rbx, Address(OSR_buf, slot_offset + 1*BytesPerWord));

       __ movptr(frame_map()->address_for_monitor_object(i), rbx);

     }

   }

 }

 // inline cache check; done before the frame is built.

 int LIR_Assembler::check_icache() {

   Register receiver = FrameMap::receiver_opr->as_register();

   Register ic_klass = IC_Klass;

   const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);

   if (!VerifyOops) {

     // insert some nops so that the verified entry point is aligned on CodeEntryAlignment

     while ((__ offset() + ic_cmp_size) % CodeEntryAlignment != 0) {

       __ nop();

     }

   }

   int offset = __ offset();

   __ inline_cache_check(receiver, IC_Klass);

   assert(__ offset() % CodeEntryAlignment == 0 || VerifyOops, "alignment must be correct");

   if (VerifyOops) {

     // force alignment after the cache check.

     // It's been verified to be aligned if !VerifyOops

     __ align(CodeEntryAlignment);

   }

   return offset;

 }

 void LIR_Assembler::jobject2reg_with_patching(Register reg, CodeEmitInfo* info) {

   jobject o = NULL;

   PatchingStub* patch = new PatchingStub(_masm, PatchingStub::load_klass_id);

   __ movoop(reg, o);

   patching_epilog(patch, lir_patch_normal, reg, info);

 }

 void LIR_Assembler::monitorexit(LIR_Opr obj_opr, LIR_Opr lock_opr, Register new_hdr, int monitor_no, Register exception) {

   if (exception->is_valid()) {

     // preserve exception

     // note: the monitor_exit runtime call is a leaf routine

     //       and cannot block => no GC can happen

     // The slow case (MonitorAccessStub) uses the first two stack slots

     // ([esp+0] and [esp+4]), therefore we store the exception at [esp+8]

     __ movptr (Address(rsp, 2*wordSize), exception);

   }

   Register obj_reg  = obj_opr->as_register();

   Register lock_reg = lock_opr->as_register();

   // setup registers (lock_reg must be rax, for lock_object)

   assert(obj_reg != SYNC_header && lock_reg != SYNC_header, "rax, must be available here");

   Register hdr = lock_reg;

   assert(new_hdr == SYNC_header, "wrong register");

   lock_reg = new_hdr;

   // compute pointer to BasicLock

   Address lock_addr = frame_map()->address_for_monitor_lock(monitor_no);

   __ lea(lock_reg, lock_addr);

   // unlock object

   MonitorAccessStub* slow_case = new MonitorExitStub(lock_opr, true, monitor_no);

   // _slow_case_stubs->append(slow_case);

   // temporary fix: must be created after exceptionhandler, therefore as call stub

   _slow_case_stubs->append(slow_case);

   if (UseFastLocking) {

     // try inlined fast unlocking first, revert to slow locking if it fails

     // note: lock_reg points to the displaced header since the displaced header offset is 0!

     assert(BasicLock::displaced_header_offset_in_bytes() == 0, "lock_reg must point to the displaced header");

     __ unlock_object(hdr, obj_reg, lock_reg, *slow_case->entry());

   } else {

     // always do slow unlocking

     // note: the slow unlocking code could be inlined here, however if we use

     //       slow unlocking, speed doesn't matter anyway and this solution is

     //       simpler and requires less duplicated code - additionally, the

     //       slow unlocking code is the same in either case which simplifies

     //       debugging

     __ jmp(*slow_case->entry());

   }

   // done

   __ bind(*slow_case->continuation());

   if (exception->is_valid()) {

     // restore exception

     __ movptr (exception, Address(rsp, 2 * wordSize));

   }

 }

 // This specifies the rsp decrement needed to build the frame

 int LIR_Assembler::initial_frame_size_in_bytes() {

   // if rounding, must let FrameMap know!

   // The frame_map records size in slots (32bit word)

   // subtract two words to account for return address and link

   return (frame_map()->framesize() - (2*VMRegImpl::slots_per_word))  * VMRegImpl::stack_slot_size;

 }

 int LIR_Assembler::emit_exception_handler() {

   // if the last instruction is a call (typically to do a throw which

   // is coming at the end after block reordering) the return address

   // must still point into the code area in order to avoid assertion

   // failures when searching for the corresponding bci => add a nop

   // (was bug 5/14/1999 - gri)

   __ nop();

   // generate code for exception handler

   address handler_base = __ start_a_stub(exception_handler_size);

   if (handler_base == NULL) {

     // not enough space left for the handler

     bailout("exception handler overflow");

     return -1;

   }

   int offset = code_offset();

   // the exception oop and pc are in rax, and rdx

   // no other registers need to be preserved, so invalidate them

   __ invalidate_registers(false, true, true, false, true, true);

   // check that there is really an exception

   __ verify_not_null_oop(rax);

   // search an exception handler (rax: exception oop, rdx: throwing pc)

   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::handle_exception_nofpu_id)));

   __ stop("should not reach here");

   assert(code_offset() - offset <= exception_handler_size, "overflow");

   __ end_a_stub();

   return offset;

 }

 // Emit the code to remove the frame from the stack in the exception

 // unwind path.

 int LIR_Assembler::emit_unwind_handler() {

 #ifndef PRODUCT

   if (CommentedAssembly) {

     _masm->block_comment("Unwind handler");

   }

 #endif

   int offset = code_offset();

   // Fetch the exception from TLS and clear out exception related thread state

   __ get_thread(rsi);

   __ movptr(rax, Address(rsi, JavaThread::exception_oop_offset()));

   __ movptr(Address(rsi, JavaThread::exception_oop_offset()), (int32_t)NULL_WORD);

   __ movptr(Address(rsi, JavaThread::exception_pc_offset()), (int32_t)NULL_WORD);

   __ bind(_unwind_handler_entry);

   __ verify_not_null_oop(rax);

   if (method()->is_synchronized() || compilation()->env()->dtrace_method_probes()) {

     __ mov(rsi, rax);  // Preserve the exception

   }

   // Preform needed unlocking

   MonitorExitStub* stub = NULL;

   if (method()->is_synchronized()) {

     monitor_address(0, FrameMap::rax_opr);

     stub = new MonitorExitStub(FrameMap::rax_opr, true, 0);

     __ unlock_object(rdi, rbx, rax, *stub->entry());

     __ bind(*stub->continuation());

   }

   if (compilation()->env()->dtrace_method_probes()) {

     __ movoop(Address(rsp, 0), method()->constant_encoding());

     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit)));

   }

   if (method()->is_synchronized() || compilation()->env()->dtrace_method_probes()) {

     __ mov(rax, rsi);  // Restore the exception

   }

   // remove the activation and dispatch to the unwind handler

   __ remove_frame(initial_frame_size_in_bytes());

   __ jump(RuntimeAddress(Runtime1::entry_for(Runtime1::unwind_exception_id)));

   // Emit the slow path assembly

   if (stub != NULL) {

     stub->emit_code(this);

   }

   return offset;

 }

 int LIR_Assembler::emit_deopt_handler() {

   // if the last instruction is a call (typically to do a throw which

   // is coming at the end after block reordering) the return address

   // must still point into the code area in order to avoid assertion

   // failures when searching for the corresponding bci => add a nop

   // (was bug 5/14/1999 - gri)

   __ nop();

   // generate code for exception handler

   address handler_base = __ start_a_stub(deopt_handler_size);

   if (handler_base == NULL) {

     // not enough space left for the handler

     bailout("deopt handler overflow");

     return -1;

   }

   int offset = code_offset();

   InternalAddress here(__ pc());

   __ pushptr(here.addr());

   __ jump(RuntimeAddress(SharedRuntime::deopt_blob()->unpack()));

   assert(code_offset() - offset <= deopt_handler_size, "overflow");

   __ end_a_stub();

   return offset;

 }

 // This is the fast version of java.lang.String.compare; it has not

 // OSR-entry and therefore, we generate a slow version for OSR's

 void LIR_Assembler::emit_string_compare(LIR_Opr arg0, LIR_Opr arg1, LIR_Opr dst, CodeEmitInfo* info) {

   __ movptr (rbx, rcx); // receiver is in rcx

   __ movptr (rax, arg1->as_register());

   // Get addresses of first characters from both Strings

   __ movptr (rsi, Address(rax, java_lang_String::value_offset_in_bytes()));

   __ movptr (rcx, Address(rax, java_lang_String::offset_offset_in_bytes()));

   __ lea    (rsi, Address(rsi, rcx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)));

   // rbx, may be NULL

   add_debug_info_for_null_check_here(info);

   __ movptr (rdi, Address(rbx, java_lang_String::value_offset_in_bytes()));

   __ movptr (rcx, Address(rbx, java_lang_String::offset_offset_in_bytes()));

   __ lea    (rdi, Address(rdi, rcx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)));

   // compute minimum length (in rax) and difference of lengths (on top of stack)

   if (VM_Version::supports_cmov()) {

     __ movl     (rbx, Address(rbx, java_lang_String::count_offset_in_bytes()));

     __ movl     (rax, Address(rax, java_lang_String::count_offset_in_bytes()));

     __ mov      (rcx, rbx);

     __ subptr   (rbx, rax); // subtract lengths

     __ push     (rbx);      // result

     __ cmov     (Assembler::lessEqual, rax, rcx);

   } else {

     Label L;

     __ movl     (rbx, Address(rbx, java_lang_String::count_offset_in_bytes()));

     __ movl     (rcx, Address(rax, java_lang_String::count_offset_in_bytes()));

     __ mov      (rax, rbx);

     __ subptr   (rbx, rcx);

     __ push     (rbx);

     __ jcc      (Assembler::lessEqual, L);

     __ mov      (rax, rcx);

     __ bind (L);

   }

   // is minimum length 0?

   Label noLoop, haveResult;

   __ testptr (rax, rax);

   __ jcc (Assembler::zero, noLoop);

   // compare first characters

   __ load_unsigned_short(rcx, Address(rdi, 0));

   __ load_unsigned_short(rbx, Address(rsi, 0));

   __ subl(rcx, rbx);

   __ jcc(Assembler::notZero, haveResult);

   // starting loop

   __ decrement(rax); // we already tested index: skip one

   __ jcc(Assembler::zero, noLoop);

   // set rsi.edi to the end of the arrays (arrays have same length)

   // negate the index

   __ lea(rsi, Address(rsi, rax, Address::times_2, type2aelembytes(T_CHAR)));

   __ lea(rdi, Address(rdi, rax, Address::times_2, type2aelembytes(T_CHAR)));

   __ negptr(rax);

   // compare the strings in a loop

   Label loop;

   __ align(wordSize);

   __ bind(loop);

   __ load_unsigned_short(rcx, Address(rdi, rax, Address::times_2, 0));

   __ load_unsigned_short(rbx, Address(rsi, rax, Address::times_2, 0));

   __ subl(rcx, rbx);

   __ jcc(Assembler::notZero, haveResult);

   __ increment(rax);

   __ jcc(Assembler::notZero, loop);

   // strings are equal up to min length

   __ bind(noLoop);

   __ pop(rax);

   return_op(LIR_OprFact::illegalOpr);

   __ bind(haveResult);

   // leave instruction is going to discard the TOS value

   __ mov (rax, rcx); // result of call is in rax,

 }

 void LIR_Assembler::return_op(LIR_Opr result) {

   assert(result->is_illegal() || !result->is_single_cpu() || result->as_register() == rax, "word returns are in rax,");

   if (!result->is_illegal() && result->is_float_kind() && !result->is_xmm_register()) {

     assert(result->fpu() == 0, "result must already be on TOS");

   }

   // Pop the stack before the safepoint code

   __ remove_frame(initial_frame_size_in_bytes());

   bool result_is_oop = result->is_valid() ? result->is_oop() : false;

   // Note: we do not need to round double result; float result has the right precision

   // the poll sets the condition code, but no data registers

   AddressLiteral polling_page(os::get_polling_page() + (SafepointPollOffset % os::vm_page_size()),

                               relocInfo::poll_return_type);

   // NOTE: the requires that the polling page be reachable else the reloc

   // goes to the movq that loads the address and not the faulting instruction

   // which breaks the signal handler code

   __ test32(rax, polling_page);

   __ ret(0);

 }

 int LIR_Assembler::safepoint_poll(LIR_Opr tmp, CodeEmitInfo* info) {

   AddressLiteral polling_page(os::get_polling_page() + (SafepointPollOffset % os::vm_page_size()),

                               relocInfo::poll_type);

   if (info != NULL) {

     add_debug_info_for_branch(info);

   } else {

     ShouldNotReachHere();

   }

   int offset = __ offset();

   // NOTE: the requires that the polling page be reachable else the reloc

   // goes to the movq that loads the address and not the faulting instruction

   // which breaks the signal handler code

   __ test32(rax, polling_page);

   return offset;

 }

 void LIR_Assembler::move_regs(Register from_reg, Register to_reg) {

   if (from_reg != to_reg) __ mov(to_reg, from_reg);

 }

 void LIR_Assembler::swap_reg(Register a, Register b) {

   __ xchgptr(a, b);

 }

 void LIR_Assembler::const2reg(LIR_Opr src, LIR_Opr dest, LIR_PatchCode patch_code, CodeEmitInfo* info) {

   assert(src->is_constant(), "should not call otherwise");

   assert(dest->is_register(), "should not call otherwise");

   LIR_Const* c = src->as_constant_ptr();

   switch (c->type()) {

     case T_INT:

     case T_ADDRESS: {

       assert(patch_code == lir_patch_none, "no patching handled here");

       __ movl(dest->as_register(), c->as_jint());

       break;

     }

     case T_LONG: {

       assert(patch_code == lir_patch_none, "no patching handled here");

 #ifdef _LP64

       __ movptr(dest->as_register_lo(), (intptr_t)c->as_jlong());

 #else

       __ movptr(dest->as_register_lo(), c->as_jint_lo());

       __ movptr(dest->as_register_hi(), c->as_jint_hi());

 #endif // _LP64

       break;

     }

     case T_OBJECT: {

       if (patch_code != lir_patch_none) {

         jobject2reg_with_patching(dest->as_register(), info);

       } else {

         __ movoop(dest->as_register(), c->as_jobject());

       }

       break;

     }

     case T_FLOAT: {

       if (dest->is_single_xmm()) {

         if (c->is_zero_float()) {

           __ xorps(dest->as_xmm_float_reg(), dest->as_xmm_float_reg());

         } else {

           __ movflt(dest->as_xmm_float_reg(),

                    InternalAddress(float_constant(c->as_jfloat())));

         }

       } else {

         assert(dest->is_single_fpu(), "must be");

         assert(dest->fpu_regnr() == 0, "dest must be TOS");

         if (c->is_zero_float()) {

           __ fldz();

         } else if (c->is_one_float()) {

           __ fld1();

         } else {

           __ fld_s (InternalAddress(float_constant(c->as_jfloat())));

         }

       }

       break;

     }

     case T_DOUBLE: {

       if (dest->is_double_xmm()) {

         if (c->is_zero_double()) {

           __ xorpd(dest->as_xmm_double_reg(), dest->as_xmm_double_reg());

         } else {

           __ movdbl(dest->as_xmm_double_reg(),

                     InternalAddress(double_constant(c->as_jdouble())));

         }

       } else {

         assert(dest->is_double_fpu(), "must be");

         assert(dest->fpu_regnrLo() == 0, "dest must be TOS");

         if (c->is_zero_double()) {

           __ fldz();

         } else if (c->is_one_double()) {

           __ fld1();

         } else {

           __ fld_d (InternalAddress(double_constant(c->as_jdouble())));

         }

       }

       break;

     }

     default:

       ShouldNotReachHere();

   }

 }

 void LIR_Assembler::const2stack(LIR_Opr src, LIR_Opr dest) {

   assert(src->is_constant(), "should not call otherwise");

   assert(dest->is_stack(), "should not call otherwise");

   LIR_Const* c = src->as_constant_ptr();

   switch (c->type()) {

     case T_INT:  // fall through

     case T_FLOAT:

     case T_ADDRESS:

       __ movl(frame_map()->address_for_slot(dest->single_stack_ix()), c->as_jint_bits());

       break;

     case T_OBJECT:

       __ movoop(frame_map()->address_for_slot(dest->single_stack_ix()), c->as_jobject());

       break;

     case T_LONG:  // fall through

     case T_DOUBLE:

 #ifdef _LP64

       __ movptr(frame_map()->address_for_slot(dest->double_stack_ix(),

                                             lo_word_offset_in_bytes), (intptr_t)c->as_jlong_bits());

 #else

       __ movptr(frame_map()->address_for_slot(dest->double_stack_ix(),

                                               lo_word_offset_in_bytes), c->as_jint_lo_bits());

       __ movptr(frame_map()->address_for_slot(dest->double_stack_ix(),

                                               hi_word_offset_in_bytes), c->as_jint_hi_bits());

 #endif // _LP64

       break;

     default:

       ShouldNotReachHere();

   }

 }

 void LIR_Assembler::const2mem(LIR_Opr src, LIR_Opr dest, BasicType type, CodeEmitInfo* info ) {

   assert(src->is_constant(), "should not call otherwise");

   assert(dest->is_address(), "should not call otherwise");

   LIR_Const* c = src->as_constant_ptr();

   LIR_Address* addr = dest->as_address_ptr();

   int null_check_here = code_offset();

   switch (type) {

     case T_INT:    // fall through

     case T_FLOAT:

     case T_ADDRESS:

       __ movl(as_Address(addr), c->as_jint_bits());

       break;

     case T_OBJECT:  // fall through

     case T_ARRAY:

       if (c->as_jobject() == NULL) {

         __ movptr(as_Address(addr), NULL_WORD);

       } else {

         if (is_literal_address(addr)) {

           ShouldNotReachHere();

           __ movoop(as_Address(addr, noreg), c->as_jobject());

         } else {

 #ifdef _LP64

           __ movoop(rscratch1, c->as_jobject());

           null_check_here = code_offset();

           __ movptr(as_Address_lo(addr), rscratch1);

 #else

           __ movoop(as_Address(addr), c->as_jobject());

 #endif

         }

       }

       break;

     case T_LONG:    // fall through

     case T_DOUBLE:

 #ifdef _LP64

       if (is_literal_address(addr)) {

         ShouldNotReachHere();

         __ movptr(as_Address(addr, r15_thread), (intptr_t)c->as_jlong_bits());

       } else {

         __ movptr(r10, (intptr_t)c->as_jlong_bits());

         null_check_here = code_offset();

         __ movptr(as_Address_lo(addr), r10);

       }

 #else

       // Always reachable in 32bit so this doesn't produce useless move literal

       __ movptr(as_Address_hi(addr), c->as_jint_hi_bits());

       __ movptr(as_Address_lo(addr), c->as_jint_lo_bits());

 #endif // _LP64

       break;

     case T_BOOLEAN: // fall through

     case T_BYTE:

       __ movb(as_Address(addr), c->as_jint() & 0xFF);

       break;

     case T_CHAR:    // fall through

     case T_SHORT:

       __ movw(as_Address(addr), c->as_jint() & 0xFFFF);

       break;

     default:

       ShouldNotReachHere();

   };

   if (info != NULL) {

     add_debug_info_for_null_check(null_check_here, info);

   }

 }

 void LIR_Assembler::reg2reg(LIR_Opr src, LIR_Opr dest) {

   assert(src->is_register(), "should not call otherwise");

   assert(dest->is_register(), "should not call otherwise");

   // move between cpu-registers

   if (dest->is_single_cpu()) {

 #ifdef _LP64

     if (src->type() == T_LONG) {

       // Can do LONG -> OBJECT

       move_regs(src->as_register_lo(), dest->as_register());

       return;

     }

 #endif

     assert(src->is_single_cpu(), "must match");

     if (src->type() == T_OBJECT) {

       __ verify_oop(src->as_register());

     }

     move_regs(src->as_register(), dest->as_register());

   } else if (dest->is_double_cpu()) {

 #ifdef _LP64

     if (src->type() == T_OBJECT || src->type() == T_ARRAY) {

       // Surprising to me but we can see move of a long to t_object

       __ verify_oop(src->as_register());

       move_regs(src->as_register(), dest->as_register_lo());

       return;

     }

 #endif

     assert(src->is_double_cpu(), "must match");

     Register f_lo = src->as_register_lo();

     Register f_hi = src->as_register_hi();

     Register t_lo = dest->as_register_lo();

     Register t_hi = dest->as_register_hi();

 #ifdef _LP64

     assert(f_hi == f_lo, "must be same");

     assert(t_hi == t_lo, "must be same");

     move_regs(f_lo, t_lo);

 #else

     assert(f_lo != f_hi && t_lo != t_hi, "invalid register allocation");

     if (f_lo == t_hi && f_hi == t_lo) {

       swap_reg(f_lo, f_hi);

     } else if (f_hi == t_lo) {

       assert(f_lo != t_hi, "overwriting register");

       move_regs(f_hi, t_hi);

       move_regs(f_lo, t_lo);

     } else {

       assert(f_hi != t_lo, "overwriting register");

       move_regs(f_lo, t_lo);

       move_regs(f_hi, t_hi);

     }

 #endif // LP64

     // special moves from fpu-register to xmm-register

     // necessary for method results

   } else if (src->is_single_xmm() && !dest->is_single_xmm()) {

     __ movflt(Address(rsp, 0), src->as_xmm_float_reg());

     __ fld_s(Address(rsp, 0));

   } else if (src->is_double_xmm() && !dest->is_double_xmm()) {

     __ movdbl(Address(rsp, 0), src->as_xmm_double_reg());

     __ fld_d(Address(rsp, 0));

   } else if (dest->is_single_xmm() && !src->is_single_xmm()) {

     __ fstp_s(Address(rsp, 0));

     __ movflt(dest->as_xmm_float_reg(), Address(rsp, 0));

   } else if (dest->is_double_xmm() && !src->is_double_xmm()) {

     __ fstp_d(Address(rsp, 0));

     __ movdbl(dest->as_xmm_double_reg(), Address(rsp, 0));

     // move between xmm-registers

   } else if (dest->is_single_xmm()) {

     assert(src->is_single_xmm(), "must match");

     __ movflt(dest->as_xmm_float_reg(), src->as_xmm_float_reg());

   } else if (dest->is_double_xmm()) {

     assert(src->is_double_xmm(), "must match");

     __ movdbl(dest->as_xmm_double_reg(), src->as_xmm_double_reg());

     // move between fpu-registers (no instruction necessary because of fpu-stack)

   } else if (dest->is_single_fpu() || dest->is_double_fpu()) {

     assert(src->is_single_fpu() || src->is_double_fpu(), "must match");

     assert(src->fpu() == dest->fpu(), "currently should be nothing to do");

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::reg2stack(LIR_Opr src, LIR_Opr dest, BasicType type, bool pop_fpu_stack) {

   assert(src->is_register(), "should not call otherwise");

   assert(dest->is_stack(), "should not call otherwise");

   if (src->is_single_cpu()) {

     Address dst = frame_map()->address_for_slot(dest->single_stack_ix());

     if (type == T_OBJECT || type == T_ARRAY) {

       __ verify_oop(src->as_register());

       __ movptr (dst, src->as_register());

     } else {

       __ movl (dst, src->as_register());

     }

   } else if (src->is_double_cpu()) {

     Address dstLO = frame_map()->address_for_slot(dest->double_stack_ix(), lo_word_offset_in_bytes);

     Address dstHI = frame_map()->address_for_slot(dest->double_stack_ix(), hi_word_offset_in_bytes);

     __ movptr (dstLO, src->as_register_lo());

     NOT_LP64(__ movptr (dstHI, src->as_register_hi()));

   } else if (src->is_single_xmm()) {

     Address dst_addr = frame_map()->address_for_slot(dest->single_stack_ix());

     __ movflt(dst_addr, src->as_xmm_float_reg());

   } else if (src->is_double_xmm()) {

     Address dst_addr = frame_map()->address_for_slot(dest->double_stack_ix());

     __ movdbl(dst_addr, src->as_xmm_double_reg());

   } else if (src->is_single_fpu()) {

     assert(src->fpu_regnr() == 0, "argument must be on TOS");

     Address dst_addr = frame_map()->address_for_slot(dest->single_stack_ix());

     if (pop_fpu_stack)     __ fstp_s (dst_addr);

     else                   __ fst_s  (dst_addr);

   } else if (src->is_double_fpu()) {

     assert(src->fpu_regnrLo() == 0, "argument must be on TOS");

     Address dst_addr = frame_map()->address_for_slot(dest->double_stack_ix());

     if (pop_fpu_stack)     __ fstp_d (dst_addr);

     else                   __ fst_d  (dst_addr);

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::reg2mem(LIR_Opr src, LIR_Opr dest, BasicType type, LIR_PatchCode patch_code, CodeEmitInfo* info, bool pop_fpu_stack, bool /* unaligned */) {

   LIR_Address* to_addr = dest->as_address_ptr();

   PatchingStub* patch = NULL;

   if (type == T_ARRAY || type == T_OBJECT) {

     __ verify_oop(src->as_register());

   }

   if (patch_code != lir_patch_none) {

     patch = new PatchingStub(_masm, PatchingStub::access_field_id);

     Address toa = as_Address(to_addr);

     assert(toa.disp() != 0, "must have");

   }

   if (info != NULL) {

     add_debug_info_for_null_check_here(info);

   }

   switch (type) {

     case T_FLOAT: {

       if (src->is_single_xmm()) {

         __ movflt(as_Address(to_addr), src->as_xmm_float_reg());

       } else {

         assert(src->is_single_fpu(), "must be");

         assert(src->fpu_regnr() == 0, "argument must be on TOS");

         if (pop_fpu_stack)      __ fstp_s(as_Address(to_addr));

         else                    __ fst_s (as_Address(to_addr));

       }

       break;

     }

     case T_DOUBLE: {

       if (src->is_double_xmm()) {

         __ movdbl(as_Address(to_addr), src->as_xmm_double_reg());

       } else {

         assert(src->is_double_fpu(), "must be");

         assert(src->fpu_regnrLo() == 0, "argument must be on TOS");

         if (pop_fpu_stack)      __ fstp_d(as_Address(to_addr));

         else                    __ fst_d (as_Address(to_addr));

       }

       break;

     }

     case T_ADDRESS: // fall through

     case T_ARRAY:   // fall through

     case T_OBJECT:  // fall through

 #ifdef _LP64

       __ movptr(as_Address(to_addr), src->as_register());

       break;

 #endif // _LP64

     case T_INT:

       __ movl(as_Address(to_addr), src->as_register());

       break;

     case T_LONG: {

       Register from_lo = src->as_register_lo();

       Register from_hi = src->as_register_hi();

 #ifdef _LP64

       __ movptr(as_Address_lo(to_addr), from_lo);

 #else

       Register base = to_addr->base()->as_register();

       Register index = noreg;

       if (to_addr->index()->is_register()) {

         index = to_addr->index()->as_register();

       }

       if (base == from_lo || index == from_lo) {

         assert(base != from_hi, "can't be");

         assert(index == noreg || (index != base && index != from_hi), "can't handle this");

         __ movl(as_Address_hi(to_addr), from_hi);

         if (patch != NULL) {

           patching_epilog(patch, lir_patch_high, base, info);

           patch = new PatchingStub(_masm, PatchingStub::access_field_id);

           patch_code = lir_patch_low;

         }

         __ movl(as_Address_lo(to_addr), from_lo);

       } else {

         assert(index == noreg || (index != base && index != from_lo), "can't handle this");

         __ movl(as_Address_lo(to_addr), from_lo);

         if (patch != NULL) {

           patching_epilog(patch, lir_patch_low, base, info);

           patch = new PatchingStub(_masm, PatchingStub::access_field_id);

           patch_code = lir_patch_high;

         }

         __ movl(as_Address_hi(to_addr), from_hi);

       }

 #endif // _LP64

       break;

     }

     case T_BYTE:    // fall through

     case T_BOOLEAN: {

       Register src_reg = src->as_register();

       Address dst_addr = as_Address(to_addr);

       assert(VM_Version::is_P6() || src_reg->has_byte_register(), "must use byte registers if not P6");

       __ movb(dst_addr, src_reg);

       break;

     }

     case T_CHAR:    // fall through

     case T_SHORT:

       __ movw(as_Address(to_addr), src->as_register());

       break;

     default:

       ShouldNotReachHere();

   }

   if (patch_code != lir_patch_none) {

     patching_epilog(patch, patch_code, to_addr->base()->as_register(), info);

   }

 }

 void LIR_Assembler::stack2reg(LIR_Opr src, LIR_Opr dest, BasicType type) {

   assert(src->is_stack(), "should not call otherwise");

   assert(dest->is_register(), "should not call otherwise");

   if (dest->is_single_cpu()) {

     if (type == T_ARRAY || type == T_OBJECT) {

       __ movptr(dest->as_register(), frame_map()->address_for_slot(src->single_stack_ix()));

       __ verify_oop(dest->as_register());

     } else {

       __ movl(dest->as_register(), frame_map()->address_for_slot(src->single_stack_ix()));

     }

   } else if (dest->is_double_cpu()) {

     Address src_addr_LO = frame_map()->address_for_slot(src->double_stack_ix(), lo_word_offset_in_bytes);

     Address src_addr_HI = frame_map()->address_for_slot(src->double_stack_ix(), hi_word_offset_in_bytes);

     __ movptr(dest->as_register_lo(), src_addr_LO);

     NOT_LP64(__ movptr(dest->as_register_hi(), src_addr_HI));

   } else if (dest->is_single_xmm()) {

     Address src_addr = frame_map()->address_for_slot(src->single_stack_ix());

     __ movflt(dest->as_xmm_float_reg(), src_addr);

   } else if (dest->is_double_xmm()) {

     Address src_addr = frame_map()->address_for_slot(src->double_stack_ix());

     __ movdbl(dest->as_xmm_double_reg(), src_addr);

   } else if (dest->is_single_fpu()) {

     assert(dest->fpu_regnr() == 0, "dest must be TOS");

     Address src_addr = frame_map()->address_for_slot(src->single_stack_ix());

     __ fld_s(src_addr);

   } else if (dest->is_double_fpu()) {

     assert(dest->fpu_regnrLo() == 0, "dest must be TOS");

     Address src_addr = frame_map()->address_for_slot(src->double_stack_ix());

     __ fld_d(src_addr);

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::stack2stack(LIR_Opr src, LIR_Opr dest, BasicType type) {

   if (src->is_single_stack()) {

     if (type == T_OBJECT || type == T_ARRAY) {

       __ pushptr(frame_map()->address_for_slot(src ->single_stack_ix()));

       __ popptr (frame_map()->address_for_slot(dest->single_stack_ix()));

     } else {

 #ifndef _LP64

       __ pushl(frame_map()->address_for_slot(src ->single_stack_ix()));

       __ popl (frame_map()->address_for_slot(dest->single_stack_ix()));

 #else

       //no pushl on 64bits

       __ movl(rscratch1, frame_map()->address_for_slot(src ->single_stack_ix()));

       __ movl(frame_map()->address_for_slot(dest->single_stack_ix()), rscratch1);

 #endif

     }

   } else if (src->is_double_stack()) {

 #ifdef _LP64

     __ pushptr(frame_map()->address_for_slot(src ->double_stack_ix()));

     __ popptr (frame_map()->address_for_slot(dest->double_stack_ix()));

 #else

     __ pushl(frame_map()->address_for_slot(src ->double_stack_ix(), 0));

     // push and pop the part at src + wordSize, adding wordSize for the previous push

     __ pushl(frame_map()->address_for_slot(src ->double_stack_ix(), 2 * wordSize));

     __ popl (frame_map()->address_for_slot(dest->double_stack_ix(), 2 * wordSize));

     __ popl (frame_map()->address_for_slot(dest->double_stack_ix(), 0));

 #endif // _LP64

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::mem2reg(LIR_Opr src, LIR_Opr dest, BasicType type, LIR_PatchCode patch_code, CodeEmitInfo* info, bool /* unaligned */) {

   assert(src->is_address(), "should not call otherwise");

   assert(dest->is_register(), "should not call otherwise");

   LIR_Address* addr = src->as_address_ptr();

   Address from_addr = as_Address(addr);

   switch (type) {

     case T_BOOLEAN: // fall through

     case T_BYTE:    // fall through

     case T_CHAR:    // fall through

     case T_SHORT:

       if (!VM_Version::is_P6() && !from_addr.uses(dest->as_register())) {

         // on pre P6 processors we may get partial register stalls

         // so blow away the value of to_rinfo before loading a

         // partial word into it.  Do it here so that it precedes

         // the potential patch point below.

         __ xorptr(dest->as_register(), dest->as_register());

       }

       break;

   }

   PatchingStub* patch = NULL;

   if (patch_code != lir_patch_none) {

     patch = new PatchingStub(_masm, PatchingStub::access_field_id);

     assert(from_addr.disp() != 0, "must have");

   }

   if (info != NULL) {

     add_debug_info_for_null_check_here(info);

   }

   switch (type) {

     case T_FLOAT: {

       if (dest->is_single_xmm()) {

         __ movflt(dest->as_xmm_float_reg(), from_addr);

       } else {

         assert(dest->is_single_fpu(), "must be");

         assert(dest->fpu_regnr() == 0, "dest must be TOS");

         __ fld_s(from_addr);

       }

       break;

     }

     case T_DOUBLE: {

       if (dest->is_double_xmm()) {

         __ movdbl(dest->as_xmm_double_reg(), from_addr);

       } else {

         assert(dest->is_double_fpu(), "must be");

         assert(dest->fpu_regnrLo() == 0, "dest must be TOS");

         __ fld_d(from_addr);

       }

       break;

     }

     case T_ADDRESS: // fall through

     case T_OBJECT:  // fall through

     case T_ARRAY:   // fall through

 #ifdef _LP64

       __ movptr(dest->as_register(), from_addr);

       break;

 #endif // _L64

     case T_INT:

       __ movl(dest->as_register(), from_addr);

       break;

     case T_LONG: {

       Register to_lo = dest->as_register_lo();

       Register to_hi = dest->as_register_hi();

 #ifdef _LP64

       __ movptr(to_lo, as_Address_lo(addr));

 #else

       Register base = addr->base()->as_register();

       Register index = noreg;

       if (addr->index()->is_register()) {

         index = addr->index()->as_register();

       }

       if ((base == to_lo && index == to_hi) ||

           (base == to_hi && index == to_lo)) {

         // addresses with 2 registers are only formed as a result of

         // array access so this code will never have to deal with

         // patches or null checks.

         assert(info == NULL && patch == NULL, "must be");

         __ lea(to_hi, as_Address(addr));

         __ movl(to_lo, Address(to_hi, 0));

         __ movl(to_hi, Address(to_hi, BytesPerWord));

       } else if (base == to_lo || index == to_lo) {

         assert(base != to_hi, "can't be");

         assert(index == noreg || (index != base && index != to_hi), "can't handle this");

         __ movl(to_hi, as_Address_hi(addr));

         if (patch != NULL) {

           patching_epilog(patch, lir_patch_high, base, info);

           patch = new PatchingStub(_masm, PatchingStub::access_field_id);

           patch_code = lir_patch_low;

         }

         __ movl(to_lo, as_Address_lo(addr));

       } else {

         assert(index == noreg || (index != base && index != to_lo), "can't handle this");

         __ movl(to_lo, as_Address_lo(addr));

         if (patch != NULL) {

           patching_epilog(patch, lir_patch_low, base, info);

           patch = new PatchingStub(_masm, PatchingStub::access_field_id);

           patch_code = lir_patch_high;

         }

         __ movl(to_hi, as_Address_hi(addr));

       }

 #endif // _LP64

       break;

     }

     case T_BOOLEAN: // fall through

     case T_BYTE: {

       Register dest_reg = dest->as_register();

       assert(VM_Version::is_P6() || dest_reg->has_byte_register(), "must use byte registers if not P6");

       if (VM_Version::is_P6() || from_addr.uses(dest_reg)) {

         __ movsbl(dest_reg, from_addr);

       } else {

         __ movb(dest_reg, from_addr);

         __ shll(dest_reg, 24);

         __ sarl(dest_reg, 24);

       }

       break;

     }

     case T_CHAR: {

       Register dest_reg = dest->as_register();

       assert(VM_Version::is_P6() || dest_reg->has_byte_register(), "must use byte registers if not P6");

       if (VM_Version::is_P6() || from_addr.uses(dest_reg)) {

         __ movzwl(dest_reg, from_addr);

       } else {

         __ movw(dest_reg, from_addr);

       }

       break;

     }

     case T_SHORT: {

       Register dest_reg = dest->as_register();

       if (VM_Version::is_P6() || from_addr.uses(dest_reg)) {

         __ movswl(dest_reg, from_addr);

       } else {

         __ movw(dest_reg, from_addr);

         __ shll(dest_reg, 16);

         __ sarl(dest_reg, 16);

       }

       break;

     }

     default:

       ShouldNotReachHere();

   }

   if (patch != NULL) {

     patching_epilog(patch, patch_code, addr->base()->as_register(), info);

   }

   if (type == T_ARRAY || type == T_OBJECT) {

     __ verify_oop(dest->as_register());

   }

 }

 void LIR_Assembler::prefetchr(LIR_Opr src) {

   LIR_Address* addr = src->as_address_ptr();

   Address from_addr = as_Address(addr);

   if (VM_Version::supports_sse()) {

     switch (ReadPrefetchInstr) {

       case 0:

         __ prefetchnta(from_addr); break;

       case 1:

         __ prefetcht0(from_addr); break;

       case 2:

         __ prefetcht2(from_addr); break;

       default:

         ShouldNotReachHere(); break;

     }

   } else if (VM_Version::supports_3dnow()) {

     __ prefetchr(from_addr);

   }

 }

 void LIR_Assembler::prefetchw(LIR_Opr src) {

   LIR_Address* addr = src->as_address_ptr();

   Address from_addr = as_Address(addr);

   if (VM_Version::supports_sse()) {

     switch (AllocatePrefetchInstr) {

       case 0:

         __ prefetchnta(from_addr); break;

       case 1:

         __ prefetcht0(from_addr); break;

       case 2:

         __ prefetcht2(from_addr); break;

       case 3:

         __ prefetchw(from_addr); break;

       default:

         ShouldNotReachHere(); break;

     }

   } else if (VM_Version::supports_3dnow()) {

     __ prefetchw(from_addr);

   }

 }

 NEEDS_CLEANUP; // This could be static?

 Address::ScaleFactor LIR_Assembler::array_element_size(BasicType type) const {

   int elem_size = type2aelembytes(type);

   switch (elem_size) {

     case 1: return Address::times_1;

     case 2: return Address::times_2;

     case 4: return Address::times_4;

     case 8: return Address::times_8;

   }

   ShouldNotReachHere();

   return Address::no_scale;

 }

 void LIR_Assembler::emit_op3(LIR_Op3* op) {

   switch (op->code()) {

     case lir_idiv:

     case lir_irem:

       arithmetic_idiv(op->code(),

                       op->in_opr1(),

                       op->in_opr2(),

                       op->in_opr3(),

                       op->result_opr(),

                       op->info());

       break;

     default:      ShouldNotReachHere(); break;

   }

 }

 void LIR_Assembler::emit_opBranch(LIR_OpBranch* op) {

 #ifdef ASSERT

   assert(op->block() == NULL || op->block()->label() == op->label(), "wrong label");

   if (op->block() != NULL)  _branch_target_blocks.append(op->block());

   if (op->ublock() != NULL) _branch_target_blocks.append(op->ublock());

 #endif

   if (op->cond() == lir_cond_always) {

     if (op->info() != NULL) add_debug_info_for_branch(op->info());

     __ jmp (*(op->label()));

   } else {

     Assembler::Condition acond = Assembler::zero;

     if (op->code() == lir_cond_float_branch) {

       assert(op->ublock() != NULL, "must have unordered successor");

       __ jcc(Assembler::parity, *(op->ublock()->label()));

       switch(op->cond()) {

         case lir_cond_equal:        acond = Assembler::equal;      break;

         case lir_cond_notEqual:     acond = Assembler::notEqual;   break;

         case lir_cond_less:         acond = Assembler::below;      break;

         case lir_cond_lessEqual:    acond = Assembler::belowEqual; break;

         case lir_cond_greaterEqual: acond = Assembler::aboveEqual; break;

         case lir_cond_greater:      acond = Assembler::above;      break;

         default:                         ShouldNotReachHere();

       }

     } else {

       switch (op->cond()) {

         case lir_cond_equal:        acond = Assembler::equal;       break;

         case lir_cond_notEqual:     acond = Assembler::notEqual;    break;

         case lir_cond_less:         acond = Assembler::less;        break;

         case lir_cond_lessEqual:    acond = Assembler::lessEqual;   break;

         case lir_cond_greaterEqual: acond = Assembler::greaterEqual;break;

         case lir_cond_greater:      acond = Assembler::greater;     break;

         case lir_cond_belowEqual:   acond = Assembler::belowEqual;  break;

         case lir_cond_aboveEqual:   acond = Assembler::aboveEqual;  break;

         default:                         ShouldNotReachHere();

       }

     }

     __ jcc(acond,*(op->label()));

   }

 }

 void LIR_Assembler::emit_opConvert(LIR_OpConvert* op) {

   LIR_Opr src  = op->in_opr();

   LIR_Opr dest = op->result_opr();

   switch (op->bytecode()) {

     case Bytecodes::_i2l:

 #ifdef _LP64

       __ movl2ptr(dest->as_register_lo(), src->as_register());

 #else

       move_regs(src->as_register(), dest->as_register_lo());

       move_regs(src->as_register(), dest->as_register_hi());

       __ sarl(dest->as_register_hi(), 31);

 #endif // LP64

       break;

     case Bytecodes::_l2i:

       move_regs(src->as_register_lo(), dest->as_register());

       break;

     case Bytecodes::_i2b:

       move_regs(src->as_register(), dest->as_register());

       __ sign_extend_byte(dest->as_register());

       break;

     case Bytecodes::_i2c:

       move_regs(src->as_register(), dest->as_register());

       __ andl(dest->as_register(), 0xFFFF);

       break;

     case Bytecodes::_i2s:

       move_regs(src->as_register(), dest->as_register());

       __ sign_extend_short(dest->as_register());

       break;

     case Bytecodes::_f2d:

     case Bytecodes::_d2f:

       if (dest->is_single_xmm()) {

         __ cvtsd2ss(dest->as_xmm_float_reg(), src->as_xmm_double_reg());

       } else if (dest->is_double_xmm()) {

         __ cvtss2sd(dest->as_xmm_double_reg(), src->as_xmm_float_reg());

       } else {

         assert(src->fpu() == dest->fpu(), "register must be equal");

         // do nothing (float result is rounded later through spilling)

       }

       break;

     case Bytecodes::_i2f:

     case Bytecodes::_i2d:

       if (dest->is_single_xmm()) {

         __ cvtsi2ssl(dest->as_xmm_float_reg(), src->as_register());

       } else if (dest->is_double_xmm()) {

         __ cvtsi2sdl(dest->as_xmm_double_reg(), src->as_register());

       } else {

         assert(dest->fpu() == 0, "result must be on TOS");

         __ movl(Address(rsp, 0), src->as_register());

         __ fild_s(Address(rsp, 0));

       }

       break;

     case Bytecodes::_f2i:

     case Bytecodes::_d2i:

       if (src->is_single_xmm()) {

         __ cvttss2sil(dest->as_register(), src->as_xmm_float_reg());

       } else if (src->is_double_xmm()) {

         __ cvttsd2sil(dest->as_register(), src->as_xmm_double_reg());

       } else {

         assert(src->fpu() == 0, "input must be on TOS");

         __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_trunc()));

         __ fist_s(Address(rsp, 0));

         __ movl(dest->as_register(), Address(rsp, 0));

         __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std()));

       }

       // IA32 conversion instructions do not match JLS for overflow, underflow and NaN -> fixup in stub

       assert(op->stub() != NULL, "stub required");

       __ cmpl(dest->as_register(), 0x80000000);

       __ jcc(Assembler::equal, *op->stub()->entry());

       __ bind(*op->stub()->continuation());

       break;

     case Bytecodes::_l2f:

     case Bytecodes::_l2d:

       assert(!dest->is_xmm_register(), "result in xmm register not supported (no SSE instruction present)");

       assert(dest->fpu() == 0, "result must be on TOS");

       __ movptr(Address(rsp, 0),            src->as_register_lo());

       NOT_LP64(__ movl(Address(rsp, BytesPerWord), src->as_register_hi()));

       __ fild_d(Address(rsp, 0));

       // float result is rounded later through spilling

       break;

     case Bytecodes::_f2l:

     case Bytecodes::_d2l:

       assert(!src->is_xmm_register(), "input in xmm register not supported (no SSE instruction present)");

       assert(src->fpu() == 0, "input must be on TOS");

       assert(dest == FrameMap::long0_opr, "runtime stub places result in these registers");

       // instruction sequence too long to inline it here

       {

         __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::fpu2long_stub_id)));

       }

       break;

     default: ShouldNotReachHere();

   }

 }

 void LIR_Assembler::emit_alloc_obj(LIR_OpAllocObj* op) {

   if (op->init_check()) {

     __ cmpl(Address(op->klass()->as_register(),

                     instanceKlass::init_state_offset_in_bytes() + sizeof(oopDesc)),

             instanceKlass::fully_initialized);

     add_debug_info_for_null_check_here(op->stub()->info());

     __ jcc(Assembler::notEqual, *op->stub()->entry());

   }

   __ allocate_object(op->obj()->as_register(),

                      op->tmp1()->as_register(),

                      op->tmp2()->as_register(),

                      op->header_size(),

                      op->object_size(),

                      op->klass()->as_register(),

                      *op->stub()->entry());

   __ bind(*op->stub()->continuation());

 }

 void LIR_Assembler::emit_alloc_array(LIR_OpAllocArray* op) {

   if (UseSlowPath ||

       (!UseFastNewObjectArray && (op->type() == T_OBJECT || op->type() == T_ARRAY)) ||

       (!UseFastNewTypeArray   && (op->type() != T_OBJECT && op->type() != T_ARRAY))) {

     __ jmp(*op->stub()->entry());

   } else {

     Register len =  op->len()->as_register();

     Register tmp1 = op->tmp1()->as_register();

     Register tmp2 = op->tmp2()->as_register();

     Register tmp3 = op->tmp3()->as_register();

     if (len == tmp1) {

       tmp1 = tmp3;

     } else if (len == tmp2) {

       tmp2 = tmp3;

     } else if (len == tmp3) {

       // everything is ok

     } else {

       __ mov(tmp3, len);

     }

     __ allocate_array(op->obj()->as_register(),

                       len,

                       tmp1,

                       tmp2,

                       arrayOopDesc::header_size(op->type()),

                       array_element_size(op->type()),

                       op->klass()->as_register(),

                       *op->stub()->entry());

   }

   __ bind(*op->stub()->continuation());

 }

 void LIR_Assembler::type_profile_helper(Register mdo,

                                         ciMethodData *md, ciProfileData *data,

                                         Register recv, Label* update_done) {

   uint i;

   for (i = 0; i < ReceiverTypeData::row_limit(); i++) {

     Label next_test;

     // See if the receiver is receiver[n].

     __ cmpptr(recv, Address(mdo, md->byte_offset_of_slot(data, ReceiverTypeData::receiver_offset(i))));

     __ jccb(Assembler::notEqual, next_test);

     Address data_addr(mdo, md->byte_offset_of_slot(data, ReceiverTypeData::receiver_count_offset(i)));

     __ addptr(data_addr, DataLayout::counter_increment);

     __ jmpb(*update_done);

     __ bind(next_test);

   }

   // Didn't find receiver; find next empty slot and fill it in

   for (i = 0; i < ReceiverTypeData::row_limit(); i++) {

     Label next_test;

     Address recv_addr(mdo, md->byte_offset_of_slot(data, ReceiverTypeData::receiver_offset(i)));

     __ cmpptr(recv_addr, (intptr_t)NULL_WORD);

     __ jccb(Assembler::notEqual, next_test);

     __ movptr(recv_addr, recv);

     __ movptr(Address(mdo, md->byte_offset_of_slot(data, ReceiverTypeData::receiver_count_offset(i))), DataLayout::counter_increment);

     __ jmpb(*update_done);

     __ bind(next_test);

   }

 }

 void LIR_Assembler::emit_checkcast(LIR_OpTypeCheck *op) {

   assert(op->code() == lir_checkcast, "Invalid operation");

   // we always need a stub for the failure case.

   CodeStub* stub = op->stub();

   Register obj = op->object()->as_register();

   Register k_RInfo = op->tmp1()->as_register();

   Register klass_RInfo = op->tmp2()->as_register();

   Register dst = op->result_opr()->as_register();

   ciKlass* k = op->klass();

   Register Rtmp1 = noreg;

   // check if it needs to be profiled

   ciMethodData* md;

   ciProfileData* data;

   if (op->should_profile()) {

     ciMethod* method = op->profiled_method();

     assert(method != NULL, "Should have method");

     int bci = op->profiled_bci();

     md = method->method_data();

     if (md == NULL) {

       bailout("out of memory building methodDataOop");

       return;

     }

     data = md->bci_to_data(bci);

     assert(data != NULL,                "need data for checkcast");

     assert(data->is_ReceiverTypeData(), "need ReceiverTypeData for checkcast");

   }

   Label profile_cast_failure;

   Label done, done_null;

   // Where to go in case of cast failure

   Label *failure_target = op->should_profile() ? &profile_cast_failure : stub->entry();

   if (obj == k_RInfo) {

     k_RInfo = dst;

   } else if (obj == klass_RInfo) {

     klass_RInfo = dst;

   }

   if (k->is_loaded()) {

     select_different_registers(obj, dst, k_RInfo, klass_RInfo);

   } else {

     Rtmp1 = op->tmp3()->as_register();

     select_different_registers(obj, dst, k_RInfo, klass_RInfo, Rtmp1);

   }

   assert_different_registers(obj, k_RInfo, klass_RInfo);

   if (!k->is_loaded()) {

     jobject2reg_with_patching(k_RInfo, op->info_for_patch());

   } else {

 #ifdef _LP64

     __ movoop(k_RInfo, k->constant_encoding());

 #endif // _LP64

   }

   assert(obj != k_RInfo, "must be different");

   __ cmpptr(obj, (int32_t)NULL_WORD);

   if (op->should_profile()) {

     Label profile_done;

     __ jccb(Assembler::notEqual, profile_done);

     // Object is null; update methodDataOop

     Register mdo  = klass_RInfo;

     __ movoop(mdo, md->constant_encoding());

     Address data_addr(mdo, md->byte_offset_of_slot(data, DataLayout::header_offset()));

     int header_bits = DataLayout::flag_mask_to_header_mask(BitData::null_seen_byte_constant());

     __ orl(data_addr, header_bits);

     __ jmp(done_null);

     __ bind(profile_done);

   } else {

     __ jcc(Assembler::equal, done_null);

   }

   __ verify_oop(obj);

   if (op->fast_check()) {

     // get object classo

     // not a safepoint as obj null check happens earlier

     if (k->is_loaded()) {

 #ifdef _LP64

       __ cmpptr(k_RInfo, Address(obj, oopDesc::klass_offset_in_bytes()));

 #else

       __ cmpoop(Address(obj, oopDesc::klass_offset_in_bytes()), k->constant_encoding());

 #endif // _LP64

     } else {

       __ cmpptr(k_RInfo, Address(obj, oopDesc::klass_offset_in_bytes()));

     }

     __ jcc(Assembler::notEqual, *failure_target);

   } else {

     // get object class

     // not a safepoint as obj null check happens earlier

     __ movptr(klass_RInfo, Address(obj, oopDesc::klass_offset_in_bytes()));

     if (k->is_loaded()) {

       // See if we get an immediate positive hit

 #ifdef _LP64

       __ cmpptr(k_RInfo, Address(klass_RInfo, k->super_check_offset()));

 #else

       __ cmpoop(Address(klass_RInfo, k->super_check_offset()), k->constant_encoding());

 #endif // _LP64

       if (sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes() != k->super_check_offset()) {

         __ jcc(Assembler::notEqual, *failure_target);

       } else {

         // See if we get an immediate positive hit

         __ jcc(Assembler::equal, done);

         // check for self

 #ifdef _LP64

         __ cmpptr(klass_RInfo, k_RInfo);

 #else

         __ cmpoop(klass_RInfo, k->constant_encoding());

 #endif // _LP64

         __ jcc(Assembler::equal, done);

         __ push(klass_RInfo);

 #ifdef _LP64

         __ push(k_RInfo);

 #else

         __ pushoop(k->constant_encoding());

 #endif // _LP64

         __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::slow_subtype_check_id)));

         __ pop(klass_RInfo);

         __ pop(klass_RInfo);

         // result is a boolean

         __ cmpl(klass_RInfo, 0);

         __ jcc(Assembler::equal, *failure_target);

       }

     } else {

       // perform the fast part of the checking logic

       __ check_klass_subtype_fast_path(klass_RInfo, k_RInfo, Rtmp1, &done, failure_target, NULL);

       // call out-of-line instance of __ check_klass_subtype_slow_path(...):

       __ push(klass_RInfo);

       __ push(k_RInfo);

       __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::slow_subtype_check_id)));

       __ pop(klass_RInfo);

       __ pop(k_RInfo);

       // result is a boolean

       __ cmpl(k_RInfo, 0);

       __ jcc(Assembler::equal, *failure_target);

     }

   }

   __ bind(done);

   if (op->should_profile()) {

     Register mdo  = klass_RInfo, recv = k_RInfo;

     __ movoop(mdo, md->constant_encoding());

     __ movptr(recv, Address(obj, oopDesc::klass_offset_in_bytes()));

     Label update_done;

     type_profile_helper(mdo, md, data, recv, &update_done);

     __ jmpb(update_done);

     __ bind(profile_cast_failure);

     __ movoop(mdo, md->constant_encoding());

     Address counter_addr(mdo, md->byte_offset_of_slot(data, CounterData::count_offset()));

     __ subptr(counter_addr, DataLayout::counter_increment);

     __ jmp(*stub->entry());

     __ bind(update_done);

   }

   __ bind(done_null);

   if (dst != obj) {

     __ mov(dst, obj);

   }

 }

 void LIR_Assembler::emit_opTypeCheck(LIR_OpTypeCheck* op) {

   LIR_Code code = op->code();

   if (code == lir_store_check) {

     Register value = op->object()->as_register();

     Register array = op->array()->as_register();

     Register k_RInfo = op->tmp1()->as_register();

     Register klass_RInfo = op->tmp2()->as_register();

     Register Rtmp1 = op->tmp3()->as_register();

     CodeStub* stub = op->stub();

     Label done;

     __ cmpptr(value, (int32_t)NULL_WORD);

     __ jcc(Assembler::equal, done);

     add_debug_info_for_null_check_here(op->info_for_exception());

     __ movptr(k_RInfo, Address(array, oopDesc::klass_offset_in_bytes()));

     __ movptr(klass_RInfo, Address(value, oopDesc::klass_offset_in_bytes()));

     // get instance klass

     __ movptr(k_RInfo, Address(k_RInfo, objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc)));

     // perform the fast part of the checking logic

     __ check_klass_subtype_fast_path(klass_RInfo, k_RInfo, Rtmp1, &done, stub->entry(), NULL);

     // call out-of-line instance of __ check_klass_subtype_slow_path(...):

     __ push(klass_RInfo);

     __ push(k_RInfo);

     __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::slow_subtype_check_id)));

     __ pop(klass_RInfo);

     __ pop(k_RInfo);

     // result is a boolean

     __ cmpl(k_RInfo, 0);

     __ jcc(Assembler::equal, *stub->entry());

     __ bind(done);

   } else if (code == lir_instanceof) {

     Register obj = op->object()->as_register();

     Register k_RInfo = op->tmp1()->as_register();

     Register klass_RInfo = op->tmp2()->as_register();

     Register dst = op->result_opr()->as_register();

     ciKlass* k = op->klass();

     Label done;

     Label zero;

     Label one;

     if (obj == k_RInfo) {

       k_RInfo = klass_RInfo;

       klass_RInfo = obj;

     }

     // patching may screw with our temporaries on sparc,

     // so let's do it before loading the class

     if (!k->is_loaded()) {

       jobject2reg_with_patching(k_RInfo, op->info_for_patch());

     } else {

       LP64_ONLY(__ movoop(k_RInfo, k->constant_encoding()));

     }

     assert(obj != k_RInfo, "must be different");

     __ verify_oop(obj);

     if (op->fast_check()) {

       __ cmpptr(obj, (int32_t)NULL_WORD);

       __ jcc(Assembler::equal, zero);

       // get object class

       // not a safepoint as obj null check happens earlier

       if (LP64_ONLY(false &&) k->is_loaded()) {

         NOT_LP64(__ cmpoop(Address(obj, oopDesc::klass_offset_in_bytes()), k->constant_encoding()));

         k_RInfo = noreg;

       } else {

         __ cmpptr(k_RInfo, Address(obj, oopDesc::klass_offset_in_bytes()));

       }

       __ jcc(Assembler::equal, one);

     } else {

       // get object class

       // not a safepoint as obj null check happens earlier

       __ cmpptr(obj, (int32_t)NULL_WORD);

       __ jcc(Assembler::equal, zero);

       __ movptr(klass_RInfo, Address(obj, oopDesc::klass_offset_in_bytes()));

 #ifndef _LP64

       if (k->is_loaded()) {

         // See if we get an immediate positive hit

         __ cmpoop(Address(klass_RInfo, k->super_check_offset()), k->constant_encoding());

         __ jcc(Assembler::equal, one);

         if (sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes() == k->super_check_offset()) {

           // check for self

           __ cmpoop(klass_RInfo, k->constant_encoding());

           __ jcc(Assembler::equal, one);

           __ push(klass_RInfo);

           __ pushoop(k->constant_encoding());

           __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::slow_subtype_check_id)));

           __ pop(klass_RInfo);

           __ pop(dst);

           __ jmp(done);

         }

       }

         else // next block is unconditional if LP64:

 #endif // LP64

       {

         assert(dst != klass_RInfo && dst != k_RInfo, "need 3 registers");

         // perform the fast part of the checking logic

         __ check_klass_subtype_fast_path(klass_RInfo, k_RInfo, dst, &one, &zero, NULL);

         // call out-of-line instance of __ check_klass_subtype_slow_path(...):

         __ push(klass_RInfo);

         __ push(k_RInfo);

         __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::slow_subtype_check_id)));

         __ pop(klass_RInfo);

         __ pop(dst);

         __ jmp(done);

       }

     }

     __ bind(zero);

     __ xorptr(dst, dst);

     __ jmp(done);

     __ bind(one);

     __ movptr(dst, 1);

     __ bind(done);

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::emit_compare_and_swap(LIR_OpCompareAndSwap* op) {

   if (LP64_ONLY(false &&) op->code() == lir_cas_long && VM_Version::supports_cx8()) {

     assert(op->cmp_value()->as_register_lo() == rax, "wrong register");

     assert(op->cmp_value()->as_register_hi() == rdx, "wrong register");

     assert(op->new_value()->as_register_lo() == rbx, "wrong register");

     assert(op->new_value()->as_register_hi() == rcx, "wrong register");

     Register addr = op->addr()->as_register();

     if (os::is_MP()) {

       __ lock();

     }

     NOT_LP64(__ cmpxchg8(Address(addr, 0)));

   } else if (op->code() == lir_cas_int || op->code() == lir_cas_obj ) {

     NOT_LP64(assert(op->addr()->is_single_cpu(), "must be single");)

     Register addr = (op->addr()->is_single_cpu() ? op->addr()->as_register() : op->addr()->as_register_lo());

     Register newval = op->new_value()->as_register();

     Register cmpval = op->cmp_value()->as_register();

     assert(cmpval == rax, "wrong register");

     assert(newval != NULL, "new val must be register");

     assert(cmpval != newval, "cmp and new values must be in different registers");

     assert(cmpval != addr, "cmp and addr must be in different registers");

     assert(newval != addr, "new value and addr must be in different registers");

     if (os::is_MP()) {

       __ lock();

     }

     if ( op->code() == lir_cas_obj) {

       __ cmpxchgptr(newval, Address(addr, 0));

     } else if (op->code() == lir_cas_int) {

       __ cmpxchgl(newval, Address(addr, 0));

     } else {

       LP64_ONLY(__ cmpxchgq(newval, Address(addr, 0)));

     }

 #ifdef _LP64

   } else if (op->code() == lir_cas_long) {

     Register addr = (op->addr()->is_single_cpu() ? op->addr()->as_register() : op->addr()->as_register_lo());

     Register newval = op->new_value()->as_register_lo();

     Register cmpval = op->cmp_value()->as_register_lo();

     assert(cmpval == rax, "wrong register");

     assert(newval != NULL, "new val must be register");

     assert(cmpval != newval, "cmp and new values must be in different registers");

     assert(cmpval != addr, "cmp and addr must be in different registers");

     assert(newval != addr, "new value and addr must be in different registers");

     if (os::is_MP()) {

       __ lock();

     }

     __ cmpxchgq(newval, Address(addr, 0));

 #endif // _LP64

   } else {

     Unimplemented();

   }

 }

 void LIR_Assembler::cmove(LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result) {

   Assembler::Condition acond, ncond;

   switch (condition) {

     case lir_cond_equal:        acond = Assembler::equal;        ncond = Assembler::notEqual;     break;

     case lir_cond_notEqual:     acond = Assembler::notEqual;     ncond = Assembler::equal;        break;

     case lir_cond_less:         acond = Assembler::less;         ncond = Assembler::greaterEqual; break;

     case lir_cond_lessEqual:    acond = Assembler::lessEqual;    ncond = Assembler::greater;      break;

     case lir_cond_greaterEqual: acond = Assembler::greaterEqual; ncond = Assembler::less;         break;

     case lir_cond_greater:      acond = Assembler::greater;      ncond = Assembler::lessEqual;    break;

     case lir_cond_belowEqual:   acond = Assembler::belowEqual;   ncond = Assembler::above;        break;

     case lir_cond_aboveEqual:   acond = Assembler::aboveEqual;   ncond = Assembler::below;        break;

     default:                    ShouldNotReachHere();

   }

   if (opr1->is_cpu_register()) {

     reg2reg(opr1, result);

   } else if (opr1->is_stack()) {

     stack2reg(opr1, result, result->type());

   } else if (opr1->is_constant()) {

     const2reg(opr1, result, lir_patch_none, NULL);

   } else {

     ShouldNotReachHere();

   }

   if (VM_Version::supports_cmov() && !opr2->is_constant()) {

     // optimized version that does not require a branch

     if (opr2->is_single_cpu()) {

       assert(opr2->cpu_regnr() != result->cpu_regnr(), "opr2 already overwritten by previous move");

       __ cmov(ncond, result->as_register(), opr2->as_register());

     } else if (opr2->is_double_cpu()) {

       assert(opr2->cpu_regnrLo() != result->cpu_regnrLo() && opr2->cpu_regnrLo() != result->cpu_regnrHi(), "opr2 already overwritten by previous move");

       assert(opr2->cpu_regnrHi() != result->cpu_regnrLo() && opr2->cpu_regnrHi() != result->cpu_regnrHi(), "opr2 already overwritten by previous move");

       __ cmovptr(ncond, result->as_register_lo(), opr2->as_register_lo());

       NOT_LP64(__ cmovptr(ncond, result->as_register_hi(), opr2->as_register_hi());)

     } else if (opr2->is_single_stack()) {

       __ cmovl(ncond, result->as_register(), frame_map()->address_for_slot(opr2->single_stack_ix()));

     } else if (opr2->is_double_stack()) {

       __ cmovptr(ncond, result->as_register_lo(), frame_map()->address_for_slot(opr2->double_stack_ix(), lo_word_offset_in_bytes));

       NOT_LP64(__ cmovptr(ncond, result->as_register_hi(), frame_map()->address_for_slot(opr2->double_stack_ix(), hi_word_offset_in_bytes));)

     } else {

       ShouldNotReachHere();

     }

   } else {

     Label skip;

     __ jcc (acond, skip);

     if (opr2->is_cpu_register()) {

       reg2reg(opr2, result);

     } else if (opr2->is_stack()) {

       stack2reg(opr2, result, result->type());

     } else if (opr2->is_constant()) {

       const2reg(opr2, result, lir_patch_none, NULL);

     } else {

       ShouldNotReachHere();

     }

     __ bind(skip);

   }

 }

 void LIR_Assembler::arith_op(LIR_Code code, LIR_Opr left, LIR_Opr right, LIR_Opr dest, CodeEmitInfo* info, bool pop_fpu_stack) {

   assert(info == NULL, "should never be used, idiv/irem and ldiv/lrem not handled by this method");

   if (left->is_single_cpu()) {

     assert(left == dest, "left and dest must be equal");

     Register lreg = left->as_register();

     if (right->is_single_cpu()) {

       // cpu register - cpu register

       Register rreg = right->as_register();

       switch (code) {

         case lir_add: __ addl (lreg, rreg); break;

         case lir_sub: __ subl (lreg, rreg); break;

         case lir_mul: __ imull(lreg, rreg); break;

         default:      ShouldNotReachHere();

       }

     } else if (right->is_stack()) {

       // cpu register - stack

       Address raddr = frame_map()->address_for_slot(right->single_stack_ix());

       switch (code) {

         case lir_add: __ addl(lreg, raddr); break;

         case lir_sub: __ subl(lreg, raddr); break;

         default:      ShouldNotReachHere();

       }

     } else if (right->is_constant()) {

       // cpu register - constant

       jint c = right->as_constant_ptr()->as_jint();

       switch (code) {

         case lir_add: {

           __ incrementl(lreg, c);

           break;

         }

         case lir_sub: {

           __ decrementl(lreg, c);

           break;

         }

         default: ShouldNotReachHere();

       }

     } else {

       ShouldNotReachHere();

     }

   } else if (left->is_double_cpu()) {

     assert(left == dest, "left and dest must be equal");

     Register lreg_lo = left->as_register_lo();

     Register lreg_hi = left->as_register_hi();

     if (right->is_double_cpu()) {

       // cpu register - cpu register

       Register rreg_lo = right->as_register_lo();

       Register rreg_hi = right->as_register_hi();

       NOT_LP64(assert_different_registers(lreg_lo, lreg_hi, rreg_lo, rreg_hi));

       LP64_ONLY(assert_different_registers(lreg_lo, rreg_lo));

       switch (code) {

         case lir_add:

           __ addptr(lreg_lo, rreg_lo);

           NOT_LP64(__ adcl(lreg_hi, rreg_hi));

           break;

         case lir_sub:

           __ subptr(lreg_lo, rreg_lo);

           NOT_LP64(__ sbbl(lreg_hi, rreg_hi));

           break;

         case lir_mul:

 #ifdef _LP64

           __ imulq(lreg_lo, rreg_lo);

 #else

           assert(lreg_lo == rax && lreg_hi == rdx, "must be");

           __ imull(lreg_hi, rreg_lo);

           __ imull(rreg_hi, lreg_lo);

           __ addl (rreg_hi, lreg_hi);

           __ mull (rreg_lo);

           __ addl (lreg_hi, rreg_hi);

 #endif // _LP64

           break;

         default:

           ShouldNotReachHere();

       }

     } else if (right->is_constant()) {

       // cpu register - constant

 #ifdef _LP64

       jlong c = right->as_constant_ptr()->as_jlong_bits();

       __ movptr(r10, (intptr_t) c);

       switch (code) {

         case lir_add:

           __ addptr(lreg_lo, r10);

           break;

         case lir_sub:

           __ subptr(lreg_lo, r10);

           break;

         default:

           ShouldNotReachHere();

       }

 #else

       jint c_lo = right->as_constant_ptr()->as_jint_lo();

       jint c_hi = right->as_constant_ptr()->as_jint_hi();

       switch (code) {

         case lir_add:

           __ addptr(lreg_lo, c_lo);

           __ adcl(lreg_hi, c_hi);

           break;

         case lir_sub:

           __ subptr(lreg_lo, c_lo);

           __ sbbl(lreg_hi, c_hi);

           break;

         default:

           ShouldNotReachHere();

       }

 #endif // _LP64

     } else {

       ShouldNotReachHere();

     }

   } else if (left->is_single_xmm()) {

     assert(left == dest, "left and dest must be equal");

     XMMRegister lreg = left->as_xmm_float_reg();

     if (right->is_single_xmm()) {

       XMMRegister rreg = right->as_xmm_float_reg();

       switch (code) {

         case lir_add: __ addss(lreg, rreg);  break;

         case lir_sub: __ subss(lreg, rreg);  break;

         case lir_mul_strictfp: // fall through

         case lir_mul: __ mulss(lreg, rreg);  break;

         case lir_div_strictfp: // fall through

         case lir_div: __ divss(lreg, rreg);  break;

         default: ShouldNotReachHere();

       }

     } else {

       Address raddr;

       if (right->is_single_stack()) {

         raddr = frame_map()->address_for_slot(right->single_stack_ix());

       } else if (right->is_constant()) {

         // hack for now

         raddr = __ as_Address(InternalAddress(float_constant(right->as_jfloat())));

       } else {

         ShouldNotReachHere();

       }

       switch (code) {

         case lir_add: __ addss(lreg, raddr);  break;

         case lir_sub: __ subss(lreg, raddr);  break;

         case lir_mul_strictfp: // fall through

         case lir_mul: __ mulss(lreg, raddr);  break;

         case lir_div_strictfp: // fall through

         case lir_div: __ divss(lreg, raddr);  break;

         default: ShouldNotReachHere();

       }

     }

   } else if (left->is_double_xmm()) {

     assert(left == dest, "left and dest must be equal");

     XMMRegister lreg = left->as_xmm_double_reg();

     if (right->is_double_xmm()) {

       XMMRegister rreg = right->as_xmm_double_reg();

       switch (code) {

         case lir_add: __ addsd(lreg, rreg);  break;

         case lir_sub: __ subsd(lreg, rreg);  break;

         case lir_mul_strictfp: // fall through

         case lir_mul: __ mulsd(lreg, rreg);  break;

         case lir_div_strictfp: // fall through

         case lir_div: __ divsd(lreg, rreg);  break;

         default: ShouldNotReachHere();

       }

     } else {

       Address raddr;

       if (right->is_double_stack()) {

         raddr = frame_map()->address_for_slot(right->double_stack_ix());

       } else if (right->is_constant()) {

         // hack for now

         raddr = __ as_Address(InternalAddress(double_constant(right->as_jdouble())));

       } else {

         ShouldNotReachHere();

       }

       switch (code) {

         case lir_add: __ addsd(lreg, raddr);  break;

         case lir_sub: __ subsd(lreg, raddr);  break;

         case lir_mul_strictfp: // fall through

         case lir_mul: __ mulsd(lreg, raddr);  break;

         case lir_div_strictfp: // fall through

         case lir_div: __ divsd(lreg, raddr);  break;

         default: ShouldNotReachHere();

       }

     }

   } else if (left->is_single_fpu()) {

     assert(dest->is_single_fpu(),  "fpu stack allocation required");

     if (right->is_single_fpu()) {

       arith_fpu_implementation(code, left->fpu_regnr(), right->fpu_regnr(), dest->fpu_regnr(), pop_fpu_stack);

     } else {

       assert(left->fpu_regnr() == 0, "left must be on TOS");

       assert(dest->fpu_regnr() == 0, "dest must be on TOS");

       Address raddr;

       if (right->is_single_stack()) {

         raddr = frame_map()->address_for_slot(right->single_stack_ix());

       } else if (right->is_constant()) {

         address const_addr = float_constant(right->as_jfloat());

         assert(const_addr != NULL, "incorrect float/double constant maintainance");

         // hack for now

         raddr = __ as_Address(InternalAddress(const_addr));

       } else {

         ShouldNotReachHere();

       }

       switch (code) {

         case lir_add: __ fadd_s(raddr); break;

         case lir_sub: __ fsub_s(raddr); break;

         case lir_mul_strictfp: // fall through

         case lir_mul: __ fmul_s(raddr); break;

         case lir_div_strictfp: // fall through

         case lir_div: __ fdiv_s(raddr); break;

         default:      ShouldNotReachHere();

       }

     }

   } else if (left->is_double_fpu()) {

     assert(dest->is_double_fpu(),  "fpu stack allocation required");

     if (code == lir_mul_strictfp || code == lir_div_strictfp) {

       // Double values require special handling for strictfp mul/div on x86

       __ fld_x(ExternalAddress(StubRoutines::addr_fpu_subnormal_bias1()));

       __ fmulp(left->fpu_regnrLo() + 1);

     }

     if (right->is_double_fpu()) {

       arith_fpu_implementation(code, left->fpu_regnrLo(), right->fpu_regnrLo(), dest->fpu_regnrLo(), pop_fpu_stack);

     } else {

       assert(left->fpu_regnrLo() == 0, "left must be on TOS");

       assert(dest->fpu_regnrLo() == 0, "dest must be on TOS");

       Address raddr;

       if (right->is_double_stack()) {

         raddr = frame_map()->address_for_slot(right->double_stack_ix());

       } else if (right->is_constant()) {

         // hack for now

         raddr = __ as_Address(InternalAddress(double_constant(right->as_jdouble())));

       } else {

         ShouldNotReachHere();

       }

       switch (code) {

         case lir_add: __ fadd_d(raddr); break;

         case lir_sub: __ fsub_d(raddr); break;

         case lir_mul_strictfp: // fall through

         case lir_mul: __ fmul_d(raddr); break;

         case lir_div_strictfp: // fall through

         case lir_div: __ fdiv_d(raddr); break;

         default: ShouldNotReachHere();

       }

     }

     if (code == lir_mul_strictfp || code == lir_div_strictfp) {

       // Double values require special handling for strictfp mul/div on x86

       __ fld_x(ExternalAddress(StubRoutines::addr_fpu_subnormal_bias2()));

       __ fmulp(dest->fpu_regnrLo() + 1);

     }

   } else if (left->is_single_stack() || left->is_address()) {

     assert(left == dest, "left and dest must be equal");

     Address laddr;

     if (left->is_single_stack()) {

       laddr = frame_map()->address_for_slot(left->single_stack_ix());

     } else if (left->is_address()) {

       laddr = as_Address(left->as_address_ptr());

     } else {

       ShouldNotReachHere();

     }

     if (right->is_single_cpu()) {

       Register rreg = right->as_register();

       switch (code) {

         case lir_add: __ addl(laddr, rreg); break;

         case lir_sub: __ subl(laddr, rreg); break;

         default:      ShouldNotReachHere();

       }

     } else if (right->is_constant()) {

       jint c = right->as_constant_ptr()->as_jint();

       switch (code) {

         case lir_add: {

           __ incrementl(laddr, c);

           break;

         }

         case lir_sub: {

           __ decrementl(laddr, c);

           break;

         }

         default: ShouldNotReachHere();

       }

     } else {

       ShouldNotReachHere();

     }

   } else {

     ShouldNotReachHere();

   }

 }

 void LIR_Assembler::arith_fpu_implementation(LIR_Code code, int left_index, int right_index, int dest_index, bool pop_fpu_stack) {

   assert(pop_fpu_stack  || (left_index     == dest_index || right_index     == dest_index), "invalid LIR");

   assert(!pop_fpu_stack || (left_index - 1 == dest_index || right_index - 1 == dest_index), "invalid LIR");

   assert(left_index == 0 || right_index == 0, "either must be on top of stack");

   bool left_is_tos = (left_index == 0);

   bool dest_is_tos = (dest_index == 0);

   int non_tos_index = (left_is_tos ? right_index : left_index);

   switch (code) {

     case lir_add:

       if (pop_fpu_stack)       __ faddp(non_tos_index);

       else if (dest_is_tos)    __ fadd (non_tos_index);

       else                     __ fadda(non_tos_index);

       break;

     case lir_sub:

       if (left_is_tos) {

         if (pop_fpu_stack)     __ fsubrp(non_tos_index);

         else if (dest_is_tos)  __ fsub  (non_tos_index);

         else                   __ fsubra(non_tos_index);

       } else {

         if (pop_fpu_stack)     __ fsubp (non_tos_index);

         else if (dest_is_tos)  __ fsubr (non_tos_index);

         else                   __ fsuba (non_tos_index);

       }

       break;

     case lir_mul_strictfp: // fall through

     case lir_mul:

       if (pop_fpu_stack)       __ fmulp(non_tos_index);

       else if (dest_is_tos)    __ fmul (non_tos_index);

       else                     __ fmula(non_tos_index);

       break;

     case lir_div_strictfp: // fall through

     case lir_div:

       if (left_is_tos) {

         if (pop_fpu_stack)     __ fdivrp(non_tos_index);

         else if (dest_is_tos)  __ fdiv  (non_tos_index);

         else                   __ fdivra(non_tos_index);

       } else {

         if (pop_fpu_stack)     __ fdivp (non_tos_index);

         else if (dest_is_tos)  __ fdivr (non_tos_index);

         else                   __ fdiva (non_tos_index);

       }

       break;

     case lir_rem:

       assert(left_is_tos && dest_is_tos && right_index == 1, "must be guaranteed by FPU stack allocation");

       __ fremr(noreg);

       break;

     default:

       ShouldNotReachHere();

   }

 }

 void LIR_Assembler::intrinsic_op(LIR_Code code, LIR_Opr value, LIR_Opr unused, LIR_Opr dest, LIR_Op* op) {

   if (value->is_double_xmm()) {

     switch(code) {

       case lir_abs :

         {

           if (dest->as_xmm_double_reg() != value->as_xmm_double_reg()) {

             __ movdbl(dest->as_xmm_double_reg(), value->as_xmm_double_reg());

           }

           __ andpd(dest->as_xmm_double_reg(),

                     ExternalAddress((address)double_signmask_pool));

         }

         break;

       case lir_sqrt: __ sqrtsd(dest->as_xmm_double_reg(), value->as_xmm_double_reg()); break;

       // all other intrinsics are not available in the SSE instruction set, so FPU is used

       default      : ShouldNotReachHere();

     }

   } else if (value->is_double_fpu()) {

     assert(value->fpu_regnrLo() == 0 && dest->fpu_regnrLo() == 0, "both must be on TOS");

     switch(code) {

       case lir_log   : __ flog() ; break;

       case lir_log10 : __ flog10() ; break;

       case lir_abs   : __ fabs() ; break;

       case lir_sqrt  : __ fsqrt(); break;

       case lir_sin   :

         // Should consider not saving rbx, if not necessary

         __ trigfunc('s', op->as_Op2()->fpu_stack_size());

         break;

       case lir_cos :

         // Should consider not saving rbx, if not necessary

         assert(op->as_Op2()->fpu_stack_size() <= 6, "sin and cos need two free stack slots");

         __ trigfunc('c', op->as_Op2()->fpu_stack_size());

         break;

       case lir_tan :

         // Should consider not saving rbx, if not necessary

         __ trigfunc('t', op->as_Op2()->fpu_stack_size());

         break;

       default      : ShouldNotReachHere();

     }

   } else {

     Unimplemented();

   }

 }

 void LIR_Assembler::logic_op(LIR_Code code, LIR_Opr left, LIR_Opr right, LIR_Opr dst) {

   // assert(left->destroys_register(), "check");

   if (left->is_single_cpu()) {

     Register reg = left->as_register();

     if (right->is_constant()) {

       int val = right->as_constant_ptr()->as_jint();

       switch (code) {

         case lir_logic_and: __ andl (reg, val); break;

         case lir_logic_or:  __ orl  (reg, val); break;

         case lir_logic_xor: __ xorl (reg, val); break;

         default: ShouldNotReachHere();

       }

     } else if (right->is_stack()) {

       // added support for stack operands

       Address raddr = frame_map()->address_for_slot(right->single_stack_ix());

       switch (code) {

         case lir_logic_and: __ andl (reg, raddr); break;

         case lir_logic_or:  __ orl  (reg, raddr); break;

         case lir_logic_xor: __ xorl (reg, raddr); break;

         default: ShouldNotReachHere();

       }

     } else {

       Register rright = right->as_register();

       switch (code) {

         case lir_logic_and: __ andptr (reg, rright); break;

         case lir_logic_or : __ orptr  (reg, rright); break;

         case lir_logic_xor: __ xorptr (reg, rright); break;

         default: ShouldNotReachHere();

       }

     }

     move_regs(reg, dst->as_register());

   } else {

     Register l_lo = left->as_register_lo();

     Register l_hi = left->as_register_hi();

     if (right->is_constant()) {

 #ifdef _LP64

       __ mov64(rscratch1, right->as_constant_ptr()->as_jlong());

       switch (code) {

         case lir_logic_and:

           __ andq(l_lo, rscratch1);

           break;

         case lir_logic_or:

           __ orq(l_lo, rscratch1);

           break;

         case lir_logic_xor:

           __ xorq(l_lo, rscratch1);

           break;

         default: ShouldNotReachHere();

       }

 #else

       int r_lo = right->as_constant_ptr()->as_jint_lo();

       int r_hi = right->as_constant_ptr()->as_jint_hi();

       switch (code) {

         case lir_logic_and:

           __ andl(l_lo, r_lo);

           __ andl(l_hi, r_hi);

           break;

         case lir_logic_or:

           __ orl(l_lo, r_lo);

           __ orl(l_hi, r_hi);

           break;

         case lir_logic_xor:

           __ xorl(l_lo, r_lo);

           __ xorl(l_hi, r_hi);

           break;

         default: ShouldNotReachHere();

       }

 #endif // _LP64

     } else {

 #ifdef _LP64

       Register r_lo;

       if (right->type() == T_OBJECT || right->type() == T_ARRAY) {

         r_lo = right->as_register();

       } else {

         r_lo = right->as_register_lo();

       }

 #else

       Register r_lo = right->as_register_lo();

       Register r_hi = right->as_register_hi();

       assert(l_lo != r_hi, "overwriting registers");

 #endif

       switch (code) {

         case lir_logic_and:

           __ andptr(l_lo, r_lo);

           NOT_LP64(__ andptr(l_hi, r_hi);)

           break;

         case lir_logic_or:

           __ orptr(l_lo, r_lo);

           NOT_LP64(__ orptr(l_hi, r_hi);)

           break;

         case lir_logic_xor:

           __ xorptr(l_lo, r_lo);

           NOT_LP64(__ xorptr(l_hi, r_hi);)

           break;

         default: ShouldNotReachHere();

       }

     }

     Register dst_lo = dst->as_register_lo();

     Register dst_hi = dst->as_register_hi();

 #ifdef _LP64

     move_regs(l_lo, dst_lo);

 #else

     if (dst_lo == l_hi) {

       assert(dst_hi != l_lo, "overwriting registers");

       move_regs(l_hi, dst_hi);

       move_regs(l_lo, dst_lo);

     } else {

       assert(dst_lo != l_hi, "overwriting registers");

       move_regs(l_lo, dst_lo);

       move_regs(l_hi, dst_hi);

     }

 #endif // _LP64

   }

 }

 // we assume that rax, and rdx can be overwritten

 void LIR_Assembler::arithmetic_idiv(LIR_Code code, LIR_Opr left, LIR_Opr right, LIR_Opr temp, LIR_Opr result, CodeEmitInfo* info) {

   assert(left->is_single_cpu(),   "left must be register");

   assert(right->is_single_cpu() || right->is_constant(),  "right must be register or constant");

   assert(result->is_single_cpu(), "result must be register");

   //  assert(left->destroys_register(), "check");

   //  assert(right->destroys_register(), "check");

   Register lreg = left->as_register();

   Register dreg = result->as_register();

   if (right->is_constant()) {

     int divisor = right->as_constant_ptr()->as_jint();

     assert(divisor > 0 && is_power_of_2(divisor), "must be");

     if (code == lir_idiv) {

       assert(lreg == rax, "must be rax,");

       assert(temp->as_register() == rdx, "tmp register must be rdx");

       __ cdql(); // sign extend into rdx:rax

       if (divisor == 2) {

         __ subl(lreg, rdx);

       } else {

         __ andl(rdx, divisor - 1);

         __ addl(lreg, rdx);

       }

       __ sarl(lreg, log2_intptr(divisor));

       move_regs(lreg, dreg);

     } else if (code == lir_irem) {

       Label done;

       __ mov(dreg, lreg);

       __ andl(dreg, 0x80000000 | (divisor - 1));

       __ jcc(Assembler::positive, done);

       __ decrement(dreg);

       __ orl(dreg, ~(divisor - 1));

       __ increment(dreg);

       __ bind(done);

     } else {

       ShouldNotReachHere();

     }

   } else {

     Register rreg = right->as_register();

     assert(lreg == rax, "left register must be rax,");

     assert(rreg != rdx, "right register must not be rdx");

     assert(temp->as_register() == rdx, "tmp register must be rdx");

     move_regs(lreg, rax);

     int idivl_offset = __ corrected_idivl(rreg);

     add_debug_info_for_div0(idivl_offset, info);

     if (code == lir_irem) {

       move_regs(rdx, dreg); // result is in rdx

     } else {

       move_regs(rax, dreg);

     }

   }

 }

 void LIR_Assembler::comp_op(LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, LIR_Op2* op) {

   if (opr1->is_single_cpu()) {

     Register reg1 = opr1->as_register();

     if (opr2->is_single_cpu()) {

       // cpu register - cpu register

       if (opr1->type() == T_OBJECT || opr1->type() == T_ARRAY) {

         __ cmpptr(reg1, opr2->as_register());

       } else {

         assert(opr2->type() != T_OBJECT && opr2->type() != T_ARRAY, "cmp int, oop?");

         __ cmpl(reg1, opr2->as_register());

       }

     } else if (opr2->is_stack()) {

       // cpu register - stack

       if (opr1->type() == T_OBJECT || opr1->type() == T_ARRAY) {

         __ cmpptr(reg1, frame_map()->address_for_slot(opr2->single_stack_ix()));

       } else {

         __ cmpl(reg1, frame_map()->address_for_slot(opr2->single_stack_ix()));

       }

     } else if (opr2->is_constant()) {

       // cpu register - constant