faultOnNilArg1: true,
		},

		// arg0 = destination pointer
		// arg1 = source pointer
		// arg2 = # of 8-byte words to copy
		// arg3 = mem
		// returns memory
		{
			name:      "REPMOVSL",
			argLength: 4,
			reg: regInfo{
				inputs:   []regMask{buildReg("DI"), buildReg("SI"), buildReg("CX")},
				clobbers: buildReg("DI SI CX"),
			},
			faultOnNilArg0: true,
			faultOnNilArg1: true,

		v.AddArg3(dst, src, mem)
		return true
	}
	// match: (Move [s] dst src mem)
	// cond: (s > 4*128 || config.noDuffDevice) && s%4 == 0 && logLargeCopy(v, s)
	// result: (REPMOVSL dst src (MOVLconst [int32(s/4)]) mem)
	for {
		s := auxIntToInt64(v.AuxInt)
		dst := v_0
		src := v_1
		mem := v_2
		if !((s > 4*128 || config.noDuffDevice) && s%4 == 0 && logLargeCopy(v, s)) {
			break

		faultOnNilArg1: true,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 128}, // DI
				{1, 64},  // SI
			},
			clobbers: 194, // CX SI DI
		},
	},
	{
		name:           "REPMOVSL",
		argLen:         4,
		faultOnNilArg0: true,
		faultOnNilArg1: true,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 128}, // DI
				{1, 64},  // SI
				{2, 2},   // CX
			},