X64: Convert HeapNumbers that contain valid smi values to smis in binop-stub.

src/v8globals.h

Index: src/v8globals.h
diff --git a/src/v8globals.h b/src/v8globals.h
index 2a01dfd1b6f7a3df93d3221ffed4ac2b8b5e103d..dc4bac5170d86f27d8cbacb95e3341e0d1c2dde0 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -28,6 +28,7 @@
 #ifndef V8_V8GLOBALS_H_
 #define V8_V8GLOBALS_H_
 
+#include <string.h>
 #include "globals.h"
 
 namespace v8 {
@@ -345,10 +346,9 @@ enum TransitionFlag {
 
 
 // Union used for fast testing of specific double values.
-union DoubleRepresentation {
-  double  value;
+struct DoubleRepresentation {
+  explicit DoubleRepresentation(double x) { memcpy(&bits, &x, sizeof(bits)); }

[William Hesse, 2011/04/08 09:27:58]

Leave as is, or use BitCast - we don't want yet a third way of doing this.

[Lasse Reichstein, 2011/04/08 11:18:10]

agree. Removed.

   int64_t bits;
-  DoubleRepresentation(double x) { value = x; }
 };