if !(sizeof(x.Type) == 8) {
			break
		}
		v.reset(OpPPC64SRWconst)
		v.AuxInt = int64ToAuxInt(c)
		v.AddArg(x)
		return true
	}
	// match: (MOVBZreg (SRDconst [c] x))
	// cond: c>=56
	// result: (SRDconst [c] x)
	for {
		if v_0.Op != OpPPC64SRDconst {
			break
		}
		c := auxIntToInt64(v_0.AuxInt)
		x := v_0.Args[0]
		if !(c >= 56) {
			break
		}

		v.AddArg3(ptr, val, mem)
		return true
	}
}
func rewriteValueS390X_OpAvg64u(v *Value) bool {
	v_1 := v.Args[1]
	v_0 := v.Args[0]
	b := v.Block
	// match: (Avg64u <t> x y)
	// result: (ADD (SRDconst <t> (SUB <t> x y) [1]) y)
	for {
		t := v.Type
		x := v_0
		y := v_1
		v.reset(OpS390XADD)
		v0 := b.NewValue0(v.Pos, OpS390XSRDconst, t)
		v0.AuxInt = uint8ToAuxInt(1)