ivannosys3/src/targets/mips/TranslateJun.java

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package targets.mips;

import common.Instruction;

/**
 * MipS tranSlation
 *
 * @author EUGENIO CARVALHO
 */
public class TranslateJun extends Translate {

    public void TranslateBranch(Instruction inst) throws Exception {
        //BEQ
        //BNE

        //BGTZ
        //BGEZ
        //BLTZ
        //BNEZ
//             "<" "bltz"
//             ">" "bgtz"
//            "<=" "blez"
//            ">=" "bgez"
//            "==" "beq"
//            "!=" "bne"
        String instruction = Descriprion.InstructionByOperator(inst);

        LoadParam(inst, "p1,p2", true);

        String rs = inst.Get("reg.p1"),
                rt = inst.Get("reg.p2");

        Instruction branch = Descriprion.Instruction(instruction);

        switch (instruction) {
            case "beq": // == {[inst]}' ' {[rt]},{[rs]},{immediate}
            case "bne": // != 
                branch.Set("rs", rs).Set("rt", rt);

                break;
            case "blez": // <= 0{[inst]}' ' {[rs]},{immediate}
                Add(Descriprion.Instruction("slt"))
                        .Set("rs", rs)
                        .Set("rt", rt)
                        .Set("rd", "v0")
                        .Set("comment", "");
                // Atualiza o tipo de branch
                instruction = "bne";
                branch = Descriprion.Instruction(instruction)
                        .Set("rs", "v0")
                        .Set("rt", "zero");
                break;
            case "bltz": // <  0
            case "bgez": // >= 0
            case "bgtz": // >  0

                Add(Descriprion.Instruction("subu"))
                        .Set("rs", rs)
                        .Set("rt", rt)
                        .Set("rd", "v0")
                        .Set("comment", "");

                branch.Set("rs", "v0");
                break;
        }

        Add(branch)
                .Set("label", inst.Get("label"))
                .Set("comment", comments.get(instruction));

        Nop(false);
    }

}