//
// writeback.C
//
// Description:
//  Implements writeback stage of the AD-MIPS pipeline.
//
// Version:
//      $Id$
//
// Revision:
//      $Log$
//
// Author:
//  Brian J. Alliet
//  Jonathon W. Donaldson
//

#include "includes.h"

void writeback() {

    int aluwb=0, lmdwb=0;

    if(writesRD(mem_wb_ir)) {
        aluwb = RD(mem_wb_ir);
    } else if(writesRT(mem_wb_ir)) {
        if(loadsMem(mem_wb_ir))
            lmdwb = RT(mem_wb_ir);
        else
            aluwb = RT(mem_wb_ir);
    } else if(writesRA(mem_wb_ir)) {
        aluwb = RA; //RA defined in globals.h
    } else if(writesV0(mem_wb_ir)) {
        aluwb = V0;
    }

    if(aluwb) {
        id_reg_in_bus.IN().pullFrom(mem_wb_aluout);
        regs[aluwb]->latchFrom(id_reg_in_bus.OUT());
    } else if(lmdwb) {
        id_reg_in_bus.IN().pullFrom(mem_wb_lmd);
        regs[lmdwb]->latchFrom(id_reg_in_bus.OUT());
    }
}