alighorab / instruction-level-mips-simulator Goto Github PK

void add(uint8_t rs, uint8_t rt, uint8_t rd) {
   if(rd != 0) {
    NEXT_STATE.REGS[rd] = CURRENT_STATE.REGS[rs] + CURRENT_STATE.REGS[rt];
  }
}

void add(State& mips_state, uint32_t rs, uint32_t rt, uint32_t rd){
  int32_t temp1 = mips_state.reg[rs];
  int32_t temp2 = mips_state.reg[rt];
  int32_t result = temp1 + temp2;
  if (((temp1 < 0 ) && (temp2 < 0) && (result >= 0)) || ((temp1 > 0) && (temp2 > 0) && (result <= 0))){
    throw (static_cast<int>(Exception::ARITHMETIC));
  }
  else {
    mips_state.reg[rd] = temp1 + temp2;
  }
  ++mips_state.npc;
}