[x64] Fixed a rounding error on x64 for the Uint64ToF64 conversion.

src/compiler/x64/instruction-selector-x64.cc

 // Copyright 2014 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 <algorithm>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
@@ skipping 955 matching lines @@
 
 
 void InstructionSelector::VisitRoundInt64ToFloat64(Node* node) {
   X64OperandGenerator g(this);
   Emit(kSSEInt64ToFloat64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 
 void InstructionSelector::VisitRoundUint64ToFloat64(Node* node) {
   X64OperandGenerator g(this);
-  Emit(kSSEUint64ToFloat64, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+  InstructionOperand temps[] = {g.TempRegister()};
+  Emit(kSSEUint64ToFloat64, g.DefineAsRegister(node), g.Use(node->InputAt(0)),
+       arraysize(temps), temps);
 }
 
 
 void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
   X64OperandGenerator g(this);
   Emit(kX64BitcastFI, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
 }
 
 
 void InstructionSelector::VisitBitcastFloat64ToInt64(Node* node) {
@@ skipping 674 matching lines @@
   if (CpuFeatures::IsSupported(SSE4_1)) {
     flags |= MachineOperatorBuilder::kFloat64RoundDown |
              MachineOperatorBuilder::kFloat64RoundTruncate;
   }
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8