(CMPconst [0] z:(ANDconst [c] x)) && int64(uint16(c)) == c && v.Block == z.Block => (CMPconst [0] convertPPC64OpToOpCC(z))
// And finally, fixup the flag user.
(CMPconst <t> [0] (Select0 z:((ADD|AND|ANDN|OR|SUB|NOR|XOR)CC x y))) => (Select1 <t> z)
(CMPconst <t> [0] (Select0 z:((ADDCCconst|ANDCCconst|NEGCC|CNTLZDCC|RLDICLCC) y))) => (Select1 <t> z)

func ubfiz7(x uint16) uint64 {
	return uint64(x << 10) // arm64:"UBFIZ\t[$]10, R[0-9]+, [$]6",
}

func ubfiz8(x uint8) uint64 {
	return uint64(x << 7) // arm64:"UBFIZ\t[$]7, R[0-9]+, [$]1",
}

// merge ANDconst into ubfiz.
func ubfiz9(x uint64) uint64 {
	// arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND"
	// s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND"
	return (x & 0xfff) << 3
}

// These are often the exact inverse of rules in ARM64.rules.

(ADDconst [c] x) && !isARM64addcon(c)  => (ADD x (MOVDconst [c]))
(SUBconst [c] x) && !isARM64addcon(c)  => (SUB x (MOVDconst [c]))
(ANDconst [c] x) && !isARM64bitcon(uint64(c)) => (AND x (MOVDconst [c]))
(ORconst  [c] x) && !isARM64bitcon(uint64(c))  => (OR  x (MOVDconst [c]))
(XORconst [c] x) && !isARM64bitcon(uint64(c))  => (XOR x (MOVDconst [c]))