// WriteReg writes an integer register with value v.
// Writing to $0 will have no effect,
// writing to $31 will be automatically aligned.
func (rs *Registers) WriteReg(a uint8, v uint32) {
if a == 0 {
// do nothing
} else if a == inst.RegPC {
rs.ints[inst.RegPC] = align.A32(v)
} else {
rs.ints[a] = v
}
}