(MOVHZreg (RLWINM [r] y)) && mergePPC64AndRlwinm(0xFFFF,r) != 0 => (RLWINM [mergePPC64AndRlwinm(0xFFFF,r)] y)
(MOVWZreg (RLWINM [r] y)) && mergePPC64MovwzregRlwinm(r) != 0 => (RLWINM [mergePPC64MovwzregRlwinm(r)] y)
(ANDconst [m] (RLWINM [r] y)) && mergePPC64AndRlwinm(uint32(m),r) != 0 => (RLWINM [mergePPC64AndRlwinm(uint32(m),r)] y)

		return 0
	}
	return encodePPC64RotateMask(r, int64(mask_out), 32)
}

// Test if RLWINM opcode rlw clears the upper 32 bits of the
// result. Return rlw if it does, 0 otherwise.
func mergePPC64MovwzregRlwinm(rlw int64) int64 {
	_, mb, me, _ := DecodePPC64RotateMask(rlw)
	if mb > me {
		return 0
	}
	return rlw
}

		v.AddArg(x)
		return true
	}
	// match: (MOVWZreg (RLWINM [r] y))
	// cond: mergePPC64MovwzregRlwinm(r) != 0
	// result: (RLWINM [mergePPC64MovwzregRlwinm(r)] y)
	for {
		if v_0.Op != OpPPC64RLWINM {
			break
		}
		r := auxIntToInt64(v_0.AuxInt)
		y := v_0.Args[0]
		if !(mergePPC64MovwzregRlwinm(r) != 0) {
			break
		}
		v.reset(OpPPC64RLWINM)