if z.Op != OpPPC64MOVHZreg {
			break
		}
		x := z.Args[0]
		if !(z.Uses == 1 && c < 16) {
			break
		}
		v.reset(OpPPC64CLRLSLWI)
		v.AuxInt = int32ToAuxInt(newPPC64ShiftAuxInt(c, 16, 31, 32))
		v.AddArg(x)
		return true
	}
	// match: (SLWconst [c] z:(ANDconst [d] x))
	// cond: z.Uses == 1 && isPPC64ValidShiftMask(d) && c<=(32-getPPC64ShiftMaskLength(d))