(ANDconst [m] x) && isPPC64ValidShiftMask(m) => (RLDICL [encodePPC64RotateMask(0,m,64)] x)

// Likewise, trying converting RLDICLCC back to ANDCCconst as it is faster.

	v_0 := v.Args[0]
	// match: (RLDICLCC [a] x)
	// cond: convertPPC64RldiclAndccconst(a) != 0
	// result: (ANDCCconst [convertPPC64RldiclAndccconst(a)] x)
	for {
		a := auxIntToInt64(v.AuxInt)
		x := v_0
		if !(convertPPC64RldiclAndccconst(a) != 0) {
			break
		}
		v.reset(OpPPC64ANDCCconst)
		v.AuxInt = int64ToAuxInt(convertPPC64RldiclAndccconst(a))
		v.AddArg(x)
		return true
	}
	return false
}

	opCC.AddArgs(op.Args...)
	op.reset(OpSelect0)
	op.AddArgs(opCC)
	return op
}

// Try converting a RLDICL to ANDCC. If successful, return the mask otherwise 0.
func convertPPC64RldiclAndccconst(sauxint int64) int64 {
	r, _, _, mask := DecodePPC64RotateMask(sauxint)
	if r != 0 || mask&0xFFFF != mask {
		return 0
	}
	return int64(mask)
}