[x86] Use AVX in Crankshaft when available.

src/x64/lithium-x64.cc

 // Copyright 2012 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.
 
 #include <sstream>
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 730 matching lines @@
   DCHECK(instr->right()->representation().IsDouble());
   if (op == Token::MOD) {
     LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
     LOperand* right = UseFixedDouble(instr->BetterRightOperand(), xmm1);
     LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
     return MarkAsCall(DefineSameAsFirst(result), instr);
   } else {
     LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
     LOperand* right = UseRegisterAtStart(instr->BetterRightOperand());
     LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
-    return DefineSameAsFirst(result);
+    return CpuFeatures::IsSupported(AVX) ? DefineAsRegister(result)
+                                         : DefineSameAsFirst(result);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
                                            HBinaryOperation* instr) {
   HValue* left = instr->left();
   HValue* right = instr->right();
   DCHECK(left->representation().IsTagged());
   DCHECK(right->representation().IsTagged());
@@ skipping 1928 matching lines @@
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, rsi), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64