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

#include "includes.h"

void decode() {

    StorageObject& pc = imem.MAR();
    StorageObject& ex_mem_aluout = dmem.MAR();

    // FEATURE: Remove LMD?
    // when reading a register currently being written back
    // (we sort of just create the wires to allow the xfer of the value
    // b/c arch doesn't allow us to do a write in the 1st half of a clock tick
    // and a read in the 2nd half as a real register file would)
    id_reg_rs_bus.IN().pullFrom(*forward(RS(if_id_ir),regs[RS(if_id_ir)],2/*WB*/));
    id_reg_rt_bus.IN().pullFrom(*forward(RT(if_id_ir),regs[RT(if_id_ir)],2/*WB*/));
    id_ex_rs.latchFrom(id_reg_rs_bus.OUT());
    id_ex_rt.latchFrom(id_reg_rt_bus.OUT());

    // FEATURE: copyVia(bus,reg,reg);
    // copy registers to next stage
    id_imm_bus.IN().pullFrom(if_id_ir);
    id_ex_imm.latchFrom(id_imm_bus.OUT());
    id_ex_uimm.latchFrom(id_imm_bus.OUT());

    // copy shift amt to next stage
    id_shamt_bus.IN().pullFrom(if_id_ir);
    id_ex_shamt.latchFrom(id_shamt_bus.OUT());

    // connect NPS to adder for branch offset calculation
    id_npc_bus.IN().pullFrom(if_id_npc);

    // copy NPC to next stage
    id_onpc_bus.IN().pullFrom(if_id_npc);
    id_ex_onpc.latchFrom(id_onpc_bus.OUT());

    // copy IR to next stage
    id_ir_bus.IN().pullFrom(if_id_ir);
    id_ex_ir.latchFrom(id_ir_bus.OUT());

    // setup superbus
    id_branch_off_bus.IN().pullFrom(if_id_ir);
    id_jump_target_bus.IN().pullFrom(if_id_ir);

}