param int16
	flag  int8
	scond uint8
}

func IsAtomicInstruction(as obj.As) bool {
	if _, ok := atomicLDADD[as]; ok {
		return true
	}
	if _, ok := atomicSWP[as]; ok {
		return true
	}
	return false
}

// known field values of an instruction.
var atomicLDADD = map[obj.As]uint32{
	ALDADDAD:  3<<30 | 0x1c5<<21 | 0x00<<10,
	ALDADDAW:  2<<30 | 0x1c5<<21 | 0x00<<10,