v_0 := v.Args[0]
	b := v.Block
	// match: (SUBW x (MOVDconst [c]))
	// result: (SUBWconst x [int32(c)])
	for {
		x := v_0
		if v_1.Op != OpS390XMOVDconst {
			break
		}
		c := auxIntToInt64(v_1.AuxInt)
		v.reset(OpS390XSUBWconst)
		v.AuxInt = int32ToAuxInt(int32(c))
		v.AddArg(x)
		return true
	}
	// match: (SUBW (MOVDconst [c]) x)