DoNumberTagD performance improvement

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index cc7fc4d3a4203706ce0a9cccee63e43d2adbdbb2..a3cb02b4f38338c4bd9de6e642bc4321a7ea3436 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -3122,7 +3122,8 @@ void MacroAssembler::AllocateHeapNumber(Register result,
                                         Register scratch1,
                                         Register scratch2,
                                         Register heap_number_map,
-                                        Label* gc_required) {
+                                        Label* gc_required,
+                                        bool tagged) {
   // Allocate an object in the heap for the heap number and tag it as a heap
   // object.
   AllocateInNewSpace(HeapNumber::kSize,
@@ -3130,11 +3131,15 @@ void MacroAssembler::AllocateHeapNumber(Register result,
                      scratch1,
                      scratch2,
                      gc_required,
-                     TAG_OBJECT);
+                     tagged?TAG_OBJECT:NO_ALLOCATION_FLAGS);

[danno, 2012/10/10 12:27:53]

Spaces between ? and :

[aberent, 2012/10/11 15:16:53]

Done.

 
   // Store heap number map in the allocated object.
   AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-  str(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset));
+  if (tagged) {
+    str(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset));
+  } else {
+    str(heap_number_map, MemOperand(result, HeapObject::kMapOffset));
+  }
 }