}
	// match: (RISBGZ (RISBGZ x {y}) {z})
	// cond: z.InMerge(y.OutMask()) != nil
	// result: (RISBGZ x {(*z.InMerge(y.OutMask())).RotateLeft(y.Amount)})
	for {
		z := auxToS390xRotateParams(v.Aux)
		if v_0.Op != OpS390XRISBGZ {
			break
		}
		y := auxToS390xRotateParams(v_0.Aux)
		x := v_0.Args[0]
		if !(z.InMerge(y.OutMask()) != nil) {
			break
		}
		v.reset(OpS390XRISBGZ)