[turbofan] Added the RoundInt64ToFloat64 instruction to TurboFan.

src/compiler/raw-machine-assembler.h

 // 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.
 
 #ifndef V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_
 #define V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_
 
 #include "src/assembler.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
@@ skipping 415 matching lines @@
     return Float64LessThanOrEqual(b, a);
   }
 
   // Conversions.
   Node* ChangeFloat32ToFloat64(Node* a) {
     return AddNode(machine()->ChangeFloat32ToFloat64(), a);
   }
   Node* ChangeInt32ToFloat64(Node* a) {
     return AddNode(machine()->ChangeInt32ToFloat64(), a);
   }
+  Node* RoundInt64ToFloat64(Node* a) {

[rossberg, 2015/11/03 10:46:32]

Nit: maybe move it down to the Truncate operators.

[ahaas, 2015/11/03 15:03:38]

Done.

+    return AddNode(machine()->RoundInt64ToFloat64(), a);
+  }
   Node* ChangeUint32ToFloat64(Node* a) {
     return AddNode(machine()->ChangeUint32ToFloat64(), a);
   }
   Node* ChangeFloat64ToInt32(Node* a) {
     return AddNode(machine()->ChangeFloat64ToInt32(), a);
   }
   Node* ChangeFloat64ToUint32(Node* a) {
     return AddNode(machine()->ChangeFloat64ToUint32(), a);
   }
   Node* ChangeInt32ToInt64(Node* a) {
@@ skipping 160 matching lines @@
   BasicBlock* current_block_;
 
   DISALLOW_COPY_AND_ASSIGN(RawMachineAssembler);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_