__ LoadRoot(at, Heap::kNullValueRootIndex);
__ Branch(USE_DELAY_SLOT, true_label, eq, at, Operand(input));
}
- // input is an object, it is safe to use GetObjectType in the delay slot.
- __ GetObjectType(input, input, scratch);
- __ Branch(USE_DELAY_SLOT, false_label,
+ Register map = input;
+ __ GetObjectType(input, map, scratch);
+ __ Branch(false_label,
lt, scratch, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
- // Still an object, so the InstanceType can be loaded.
- __ lbu(scratch, FieldMemOperand(input, Map::kInstanceTypeOffset));
__ Branch(USE_DELAY_SLOT, false_label,
gt, scratch, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
- // Still an object, so the BitField can be loaded.
+ // map is still valid, so the BitField can be loaded in delay slot.
// Check for undetectable objects => false.
- __ lbu(at, FieldMemOperand(input, Map::kBitFieldOffset));
+ __ lbu(at, FieldMemOperand(map, Map::kBitFieldOffset));
__ And(at, at, 1 << Map::kIsUndetectable);
cmp1 = at;
cmp2 = Operand(zero_reg);