x = strings.Replace(x, "[ ", "[", -1)
	x = strings.Replace(x, " ]", "]", -1)
	x = strings.Replace(x, ")=>", ") =>", -1)
	return x
}

// opIsCommutative reports whether op s is commutative.
func opIsCommutative(op string, arch arch) bool {
	for _, x := range genericOps {
		if op == x.name {
			if x.commutative {
				return true
			}
			break
		}
	}