[turbofan] Added the RoundInt64ToFloat64 instruction to TurboFan.

src/compiler/typer.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 "src/compiler/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1999 matching lines @@
 Type* Typer::Visitor::TypeTruncateFloat64ToInt32(Node* node) {
   return Type::Intersect(Type::Signed32(), Type::UntaggedSigned32(), zone());
 }
 
 
 Type* Typer::Visitor::TypeTruncateInt64ToInt32(Node* node) {
   return Type::Intersect(Type::Signed32(), Type::UntaggedSigned32(), zone());
 }
 
 
+Type* Typer::Visitor::TypeRoundInt64ToFloat64(Node* node) {
+  return Type::PlainNumber();

[rossberg, 2015/11/03 15:13:24]

Ah, no, you should keep the Intersect as before, just replace the Internal part
in your earlier version. Sorry for not being clearer.

[ahaas, 2015/11/03 15:26:37]

Done.

+}
+
+
 Type* Typer::Visitor::TypeBitcastFloat32ToInt32(Node* node) {
   return Type::Number();
 }
 
 
 Type* Typer::Visitor::TypeBitcastFloat64ToInt64(Node* node) {
   return Type::Number();
 }
 
 
@@ skipping 162 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8