[x64] Make xmm0 allocatable and use xmm15 as scratch register instead.

src/crankshaft/x64/lithium-gap-resolver-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-gap-resolver-x64.h"
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
@@ skipping 205 matching lines @@
     } else {
       DCHECK(destination->IsDoubleStackSlot());
       __ Movsd(cgen_->ToOperand(destination), src);
     }
   } else if (source->IsDoubleStackSlot()) {
     Operand src = cgen_->ToOperand(source);
     if (destination->IsDoubleRegister()) {
       __ Movsd(cgen_->ToDoubleRegister(destination), src);
     } else {
       DCHECK(destination->IsDoubleStackSlot());
-      __ Movsd(xmm0, src);
-      __ Movsd(cgen_->ToOperand(destination), xmm0);
+      __ Movsd(kScratchDoubleReg, src);
+      __ Movsd(cgen_->ToOperand(destination), kScratchDoubleReg);
     }
   } else {
     UNREACHABLE();
   }
 
   moves_[index].Eliminate();
 }
 
 
 void LGapResolver::EmitSwap(int index) {
@@ skipping 19 matching lines @@
         cgen_->ToOperand(source->IsRegister() ? destination : source);
     __ movp(kScratchRegister, mem);
     __ movp(mem, reg);
     __ movp(reg, kScratchRegister);
 
   } else if ((source->IsStackSlot() && destination->IsStackSlot()) ||
       (source->IsDoubleStackSlot() && destination->IsDoubleStackSlot())) {
     // Swap two stack slots or two double stack slots.
     Operand src = cgen_->ToOperand(source);
     Operand dst = cgen_->ToOperand(destination);
-    __ Movsd(xmm0, src);
+    __ Movsd(kScratchDoubleReg, src);
     __ movp(kScratchRegister, dst);
-    __ Movsd(dst, xmm0);
+    __ Movsd(dst, kScratchDoubleReg);
     __ movp(src, kScratchRegister);
 
   } else if (source->IsDoubleRegister() && destination->IsDoubleRegister()) {
     // Swap two double registers.
     XMMRegister source_reg = cgen_->ToDoubleRegister(source);
     XMMRegister destination_reg = cgen_->ToDoubleRegister(destination);
-    __ Movapd(xmm0, source_reg);
+    __ Movapd(kScratchDoubleReg, source_reg);
     __ Movapd(source_reg, destination_reg);
-    __ Movapd(destination_reg, xmm0);
+    __ Movapd(destination_reg, kScratchDoubleReg);
 
   } else if (source->IsDoubleRegister() || destination->IsDoubleRegister()) {
     // Swap a double register and a double stack slot.
     DCHECK((source->IsDoubleRegister() && destination->IsDoubleStackSlot()) ||
            (source->IsDoubleStackSlot() && destination->IsDoubleRegister()));
     XMMRegister reg = cgen_->ToDoubleRegister(source->IsDoubleRegister()
                                                   ? source
                                                   : destination);
     LOperand* other = source->IsDoubleRegister() ? destination : source;
     DCHECK(other->IsDoubleStackSlot());
     Operand other_operand = cgen_->ToOperand(other);
-    __ Movapd(xmm0, reg);
+    __ Movapd(kScratchDoubleReg, reg);
     __ Movsd(reg, other_operand);
-    __ Movsd(other_operand, xmm0);
+    __ Movsd(other_operand, kScratchDoubleReg);
 
   } else {
     // No other combinations are possible.
     UNREACHABLE();
   }
 
   // The swap of source and destination has executed a move from source to
   // destination.
   moves_[index].Eliminate();
 
   // Any unperformed (including pending) move with a source of either
   // this move's source or destination needs to have their source
   // changed to reflect the state of affairs after the swap.
   for (int i = 0; i < moves_.length(); ++i) {
     LMoveOperands other_move = moves_[i];
     if (other_move.Blocks(source)) {
       moves_[i].set_source(destination);
     } else if (other_move.Blocks(destination)) {
       moves_[i].set_source(source);
     }
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64