func ParseSuffix(p *obj.Prog, cond string) error {
	cond = strings.TrimPrefix(cond, ".")

	suffix := newOpSuffix(cond)
	if !suffix.IsValid() {
		return inferSuffixError(cond)
	}

	p.Scond = uint8(suffix)
	return nil
}

// inferSuffixError returns non-nil error that describes what could be
// the cause of suffix parse failure.
//
// At the point this function is executed there is already assembly error,