},
		{
			name:          "int64 min negative value",
			in:            hex("3b7fffffffffffffff"), // -9223372036854775808
			want:          int64(-9223372036854775808),
			assertOnError: assertNilError,
		},
		{
			name: "min negative integer value supported by cbor: -2^64",
			in:   hex("3bffffffffffffffff"), // -18446744073709551616

// p256One is one in the Montgomery domain.
var p256One = p256Element{0x0000000000000001, 0xffffffff00000000,
	0xffffffffffffffff, 0x00000000fffffffe}

var p256Zero = p256Element{}

// p256P is 2²⁵⁶ - 2²²⁴ + 2¹⁹² + 2⁹⁶ - 1 in the Montgomery domain.
var p256P = p256Element{0xffffffffffffffff, 0x00000000ffffffff,
	0x0000000000000000, 0xffffffff00000001}

	a[0] = x ^ (y ^ 0xffffffff)

	// arm64:`EON\t`,-`EOR`,-`MVN`
	a[1] = ^(y ^ z)

	// arm64:`EON\t`,-`XOR`
	a[2] = x ^ ^z

	// arm64:`EON\t`,-`EOR`,-`MVN`
	return n ^ (m ^ 0xffffffffffffffff)
}

func op_orn(x, y uint32) uint32 {
	// arm64:`ORN\t`,-`ORR`
	return x | ^y
}

// check bitsets
func bitSetPowerOf2Test(x int) bool {
	// amd64:"BTL\t[$]3"
	return x&8 == 8
}

// systems. We will see.

var faultAddrs = []uint64{
	// low addresses
	0,
	1,
	0xfff,
	// high (kernel) addresses
	// or else malformed.
	0xffffffffffffffff,
	0xfffffffffffff001,
	0xffffffffffff0001,
	0xfffffffffff00001,
	0xffffffffff000001,
	0xfffffffff0000001,
	0xffffffff00000001,
	0xfffffff000000001,
	0xffffff0000000001,
	0xfffff00000000001,

// Return the encoded RLWINM constant, or 0 if they cannot be merged.
func mergePPC64ClrlsldiSrd(sld, srd int64) int64 {
	mask_1 := uint64(0xFFFFFFFFFFFFFFFF) >> uint(srd)
	// for CLRLSLDI, it's more convenient to think of it as a mask left bits then rotate left.
	mask_2 := uint64(0xFFFFFFFFFFFFFFFF) >> uint(GetPPC64Shiftmb(int64(sld)))

	// Rewrite mask to apply after the final left shift.

	PPPIOCUNBRIDGECHAN               = 0x7434
	PPPIOCXFERUNIT                   = 0x744e
	PROT_BTI                         = 0x10
	PROT_MTE                         = 0x20
	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
	PTRACE_PEEKMTETAGS               = 0x21
	PTRACE_POKEMTETAGS               = 0x22
	PTRACE_SYSEMU                    = 0x1f
	PTRACE_SYSEMU_SINGLESTEP         = 0x20
	RLIMIT_AS                        = 0x9

	PPPIOCSRASYNCMAP                 = 0x40047454
	PPPIOCSXASYNCMAP                 = 0x4020744f
	PPPIOCUNBRIDGECHAN               = 0x7434
	PPPIOCXFERUNIT                   = 0x744e
	PR_SET_PTRACER_ANY               = 0xffffffffffffffff
	PTRACE_ARCH_PRCTL                = 0x1e
	PTRACE_GETFPREGS                 = 0xe
	PTRACE_GETFPXREGS                = 0x12
	PTRACE_GET_THREAD_AREA           = 0x19
	PTRACE_OLDSETOPTIONS             = 0x15

	for _, order := range []byteOrder{LittleEndian, BigEndian} {
		const offset = 3
		for _, value := range []uint64{
			0x0000000000000000,
			0x0123456789abcdef,
			0xfedcba9876543210,
			0xffffffffffffffff,
			0xaaaaaaaaaaaaaaaa,
			math.Float64bits(math.Pi),
			math.Float64bits(math.E),
		} {
			want16 := uint16(value)
			order.PutUint16(buf[:2], want16)
			if got := order.Uint16(buf[:2]); got != want16 {

		defer func() { panic = recover() != nil }()
		f()
		return
	}

	for _, n := range []string{
		"0",
		"1000",
		"0xffffffff",
		"-0xffffffff",
		"0xffffffffffffffff",
		"0x10000000000000000",
		"0xabababababababababababababababababababababababababa",
		"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
	} {
		t.Run(n, func(t *testing.T) {

	RLIMIT_RTTIME                               = 0xf
	RLIMIT_SIGPENDING                           = 0xb
	RLIMIT_STACK                                = 0x3
	RLIM_INFINITY                               = 0xffffffffffffffff
	RTAX_ADVMSS                                 = 0x8
	RTAX_CC_ALGO                                = 0x10
	RTAX_CWND                                   = 0x7
	RTAX_FASTOPEN_NO_COOKIE                     = 0x11