X64: Load HeapNumberMap once in BinaryOpStub, and reuse it.

Review URL: http://codereview.chromium.org/2819012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4902 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/macro-assembler-x64.cc

@@ -35,6 +35,7 @@
 #include "macro-assembler-x64.h"
 #include "serialize.h"
 #include "debug.h"
+#include "heap.h"
 
 namespace v8 {
 namespace internal {
@@ -1731,6 +1732,17 @@ void MacroAssembler::AbortIfNotSmi(Register object) {
 }
 
 
+void MacroAssembler::AbortIfNotRootValue(Register src,
+                                         Heap::RootListIndex root_value_index,
+                                         const char* message) {
+  ASSERT(!src.is(kScratchRegister));
+  LoadRoot(kScratchRegister, root_value_index);
+  cmpq(src, kScratchRegister);
+  Check(equal, message);
+}
+
+
+
 Condition MacroAssembler::IsObjectStringType(Register heap_object,
                                              Register map,
                                              Register instance_type) {

src/x64/macro-assembler-x64.h

@@ -556,6 +556,11 @@ class MacroAssembler: public Assembler {
   // Abort execution if argument is not a smi. Used in debug code.
   void AbortIfNotSmi(Register object);
 
+  // Abort execution if argument is not the root value with the given index.
+  void AbortIfNotRootValue(Register src,
+                           Heap::RootListIndex root_value_index,
+                           const char* message);
+
   // ---------------------------------------------------------------------------
   // Exception handling