-void LCodeGen::DoElementsKind(LElementsKind* instr) {
- Register result = ToRegister(instr->result());
- Register input = ToRegister(instr->value());
-
- // Load map into |result|.
- __ lw(result, FieldMemOperand(input, HeapObject::kMapOffset));
- // Load the map's "bit field 2" into |result|. We only need the first byte,
- // but the following bit field extraction takes care of that anyway.
- __ lbu(result, FieldMemOperand(result, Map::kBitField2Offset));
- // Retrieve elements_kind from bit field 2.
- __ Ext(result, result, Map::kElementsKindShift, Map::kElementsKindBitCount);
-}
-
-
-void LCodeGen::DoValueOf(LValueOf* instr) {
- Register input = ToRegister(instr->value());
- Register result = ToRegister(instr->result());
- Register map = ToRegister(instr->temp());
- Label done;
-
- if (!instr->hydrogen()->value()->IsHeapObject()) {
- // If the object is a smi return the object.
- __ Move(result, input);
- __ JumpIfSmi(input, &done);
- }
-
- // If the object is not a value type, return the object.
- __ GetObjectType(input, map, map);
- __ Branch(&done, ne, map, Operand(JS_VALUE_TYPE));
- __ lw(result, FieldMemOperand(input, JSValue::kValueOffset));
-
- __ bind(&done);
-}
-
-