reg = holder_reg; // From now on the object will be in holder_reg.
__ Ldr(reg, FieldMemOperand(scratch1, Map::kPrototypeOffset));
} else {
- Register map_reg = scratch1;
- // TODO(jbramley): Skip this load when we don't need the map.
- __ Ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
+ bool need_map = (depth != 1 || check == CHECK_ALL_MAPS) ||
+ heap()->InNewSpace(*prototype);
+ Register map_reg = NoReg;
+ if (need_map) {
+ map_reg = scratch1;
+ __ Ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
+ }
if (depth != 1 || check == CHECK_ALL_MAPS) {
__ CheckMap(map_reg, current_map, miss, DONT_DO_SMI_CHECK);