}
	return fmt.Sprintf("???(%v)", arg)
}

func reverseMiddleOps(op Op) bool {
	switch op {
	case FMADD, FMADDCC, FMADDS, FMADDSCC, FMSUB, FMSUBCC, FMSUBS, FMSUBSCC, FNMADD, FNMADDCC, FNMADDS, FNMADDSCC, FNMSUB, FNMSUBCC, FNMSUBS, FNMSUBSCC, FSEL, FSELCC:
		return true
	}
	return false
}

func reverseOperandOrder(op Op) bool {
	switch op {

	"FMOVSU",
	"FMOVSX",
	"FMOVSZ",
	"FMSUB",
	"FMSUBCC",
	"FMSUBS",
	"FMSUBSCC",
	"FMUL",
	"FMULCC",
	"FMULS",
	"FMULSCC",
	"FNABS",
	"FNABSCC",
	"FNEG",
	"FNEGCC",
	"FNMADD",
	"FNMADDCC",
	"FNMADDS",
	"FNMADDSCC",
	"FNMSUB",
	"FNMSUBCC",
	"FNMSUBS",
	"FNMSUBSCC",
	"FRSP",
	"FRSPCC",
	"FSUB",
	"FSUBCC",
	"FSUBS",
	"FSUBSCC",
	"ISEL",

	{0xbfbffc00, 0x2ea0f800, FNEG, instArgs{arg_Vd_arrangement_sz_Q___2S_00__4S_01__2D_11, arg_Vn_arrangement_sz_Q___2S_00__4S_01__2D_11}, nil},
	// FNMADD <Sd>, <Sn>, <Sm>, <Sa>
	{0xffe08000, 0x1f200000, FNMADD, instArgs{arg_Sd, arg_Sn, arg_Sm, arg_Sa}, nil},
	// FNMADD <Dd>, <Dn>, <Dm>, <Da>
	{0xffe08000, 0x1f600000, FNMADD, instArgs{arg_Dd, arg_Dn, arg_Dm, arg_Da}, nil},
	// FNMSUB <Sd>, <Sn>, <Sm>, <Sa>

		fallthrough

	case FCMP, FCMPE:
		if _, ok := inst.Args[1].(Imm); ok {
			args[1] = "$(0.0)"
		}
		fallthrough

	case FADD, FSUB, FMUL, FNMUL, FDIV, FMAX, FMIN, FMAXNM, FMINNM, FCSEL, FMADD, FMSUB, FNMADD, FNMSUB:
		if strings.HasSuffix(op, "MADD") || strings.HasSuffix(op, "MSUB") {
			args[2], args[3] = args[3], args[2]
		}
		if r, ok := inst.Args[0].(Reg); ok {
			rno := uint16(r)

	FMUL:           "fmul",
	FMULCC:         "fmul.",
	FNABS:          "fnabs",
	FNABSCC:        "fnabs.",
	FNEG:           "fneg",
	FNEGCC:         "fneg.",
	FNMADD:         "fnmadd",
	FNMADDCC:       "fnmadd.",
	FNMSUB:         "fnmsub",
	FNMSUBCC:       "fnmsub.",
	FRSP:           "frsp",
	FRSPCC:         "frsp.",
	FSUB:           "fsub",
	FSUBCC:         "fsub.",

	FMSUB F1, F2, F3, F4            // fc8110f8
	FMSUBCC F1, F2, F3, F4          // fc8110f9
	FMSUBS F1, F2, F3, F4           // ec8110f8
	FMSUBSCC F1, F2, F3, F4         // ec8110f9
	FNMADD F1, F2, F3, F4           // fc8110fe
	FNMADDCC F1, F2, F3, F4         // fc8110ff
	FNMADDS F1, F2, F3, F4          // ec8110fe
	FNMADDSCC F1, F2, F3, F4        // ec8110ff
	FNMSUB F1, F2, F3, F4           // fc8110fc

//go:noinline
func fmsub(x, y, z float64) float64 {
	return FMA(x, y, -z)
}

//go:noinline
func fnmsub(x, y, z float64) float64 {
	return FMA(-x, y, z)
}

//go:noinline
func fnmadd(x, y, z float64) float64 {
	return FMA(-x, y, -z)
}

func TestFMANegativeArgs(t *testing.T) {
	// Some architectures have instructions for fused multiply-subtract and

{"Name":"FNMADD","Bits":"0|0|0|1|1|1|1|1|00:2|1|Rm:5|0|Ra:5|Rn:5|Rd:5","Arch":"Single-precision variant","Syntax":"FNMADD <Sd>, <Sn>, <Sm>, <Sa>","Code":"","Alias":""},
{"Name":"FNMADD","Bits":"0|0|0|1|1|1|1|1|01:2|1|Rm:5|0|Ra:5|Rn:5|Rd:5","Arch":"Double-precision variant","Syntax":"FNMADD <Dd>, <Dn>, <Dm>, <Da>","Code":"","Alias":""},

			rel.Off = int32(c.pc)
			rel.Siz = 4
			rel.Sym = p.To.Sym
			rel.Add = p.To.Offset
			rel.Type = objabi.R_ADDR
			o1 = 0
		}

	case 15: /* mul/mneg/umulh/umull r,[r,]r; madd/msub/fmadd/fmsub/fnmadd/fnmsub Rm,Ra,Rn,Rd */
		o1 = c.oprrr(p, p.As)

		rf := int(p.From.Reg)
		rt := int(p.To.Reg)
		var r int
		var ra int
		if p.From3Type() == obj.TYPE_REG {
			r = int(p.GetFrom3().Reg)