package midend.llvm.instr;

import backend.mips.MipsBuilder;
import backend.mips.Register;
import backend.mips.instr.MipsAlu;
import backend.mips.instr.type.MipsAluType;

import midend.llvm.type.IrType;
import midend.llvm.value.IrValue;

public class TruncInstr extends IrInstr {
    private IrType targetType;

    public TruncInstr(IrType targetType, IrValue value, String name) {
        super(targetType, name, IrInstrType.TRUNC);
        addUse(value);
        this.targetType = targetType;
    }

    public IrValue getSrc() {
        return getUse(0);
    }

    public IrType getTargetType() {
        return targetType;
    }

    public IrType getSrcType() {
        return getSrc().getType();
    }

    public String toString() {
        return getName() + " = trunc " + getSrcType()
                + " " + getSrc().getName() + " to " + getTargetType();
    }

    public void toMips() {
        Register reg = MipsBuilder.getRegister(getSrc());
        if (reg == null) {
            reg = Register.K0;
        }
        loadValueToReg(getSrc(), reg);
        if (this.targetType.isInt8()) {
            new MipsAlu(MipsAluType.ANDI, reg, reg, 0xFF);
        } else if (this.targetType.isBool()) {
            new MipsAlu(MipsAluType.ANDI, reg, reg, 0x1);
        }
        saveResult(this, reg);
    }
}