(MOVDstoreidx ptr (MOVDconst [c]) val mem) && ((is16Bit(c) && c%4 == 0) || (buildcfg.GOPPC64 >= 10 && is32Bit(c))) => (MOVDstore [int32(c)] ptr val mem)
(MOV(W|H|B)storeidx ptr (MOVDconst [c]) val mem) && (is16Bit(c) || (buildcfg.GOPPC64 >= 10 && is32Bit(c))) => (MOV(W|H|B)store [int32(c)] ptr val mem)

		v.AuxInt = int32ToAuxInt(off)
		v.Aux = symToAux(sym)
		v.AddArg2(ptr, mem)
		return true
	}
	// match: (MOVDstore [0] {sym} p:(ADD ptr idx) val mem)
	// cond: sym == nil && p.Uses == 1
	// result: (MOVDstoreidx ptr idx val mem)
	for {
		if auxIntToInt32(v.AuxInt) != 0 {
			break
		}
		sym := auxToSym(v.Aux)
		p := v_0
		if p.Op != OpPPC64ADD {
			break
		}
		idx := p.Args[1]