// If the RLDICL does not rotate its value, a shifted value can be merged.
(RLDICL [em] x:(SRDconst [s] a)) && (em&0xFF0000) == 0 => (RLDICL [mergePPC64RLDICLandSRDconst(em, s)] a)

// Convert rotated 32 bit masks on 32 bit values into rlwinm. In general, this leaves the upper 32 bits in an undefined state.

	// cond: (em&0xFF0000) == 0
	// result: (RLDICL [mergePPC64RLDICLandSRDconst(em, s)] a)
	for {
		em := auxIntToInt64(v.AuxInt)
		x := v_0
		if x.Op != OpPPC64SRDconst {
			break
		}
		s := auxIntToInt64(x.AuxInt)
		a := x.Args[0]
		if !((em & 0xFF0000) == 0) {
			break
		}
		v.reset(OpPPC64RLDICL)
		v.AuxInt = int64ToAuxInt(mergePPC64RLDICLandSRDconst(em, s))
		v.AddArg(a)
		return true
	}

// operations can be combined. This functions assumes the two opcodes can
// be merged, and returns an encoded rotate+mask value of the combined RLDICL.
func mergePPC64RLDICLandSRDconst(encoded, s int64) int64 {
	mb := s
	r := 64 - s
	// A larger mb is a smaller mask.
	if (encoded>>8)&0xFF < mb {
		encoded = (encoded &^ 0xFF00) | mb<<8
	}
	// The rotate is expected to be 0.