a := make([]uint64, N/64)
	for i := 0; i < b.N; i++ {
		for j := uint64(0); j < N; j++ {
			a[j/64] &^= 1 << (j % 64)
		}
	}
}

func BenchmarkBitToggle(b *testing.B) {
	const N = 64 * 8
	a := make([]uint64, N/64)
	for i := 0; i < b.N; i++ {
		for j := uint64(0); j < N; j++ {
			a[j/64] ^= 1 << (j % 64)
		}
	}
}

func BenchmarkBitSetConst(b *testing.B) {
	const N = 64
	a := make([]uint64, N)

func testBNEZ(a int64) (r bool)

func testGoBGE(a, b int64) bool  { return a >= b }
func testGoBGEU(a, b int64) bool { return uint64(a) >= uint64(b) }
func testGoBGT(a, b int64) bool  { return a > b }
func testGoBGTU(a, b int64) bool { return uint64(a) > uint64(b) }
func testGoBLE(a, b int64) bool  { return a <= b }
func testGoBLEU(a, b int64) bool { return uint64(a) <= uint64(b) }
func testGoBLT(a, b int64) bool  { return a < b }

}
type szD struct {
	name   string
	sn     string
	u      []uint64
	i      []int64
	oponly string
}

var szs = []szD{
	{name: "uint64", sn: "64", u: []uint64{0, 1, 4294967296, 0x8000000000000000, 0xffffFFFFffffFFFF}},
	{name: "uint64", sn: "64", u: []uint64{3, 5, 7, 9, 10, 11, 13, 19, 21, 25, 27, 37, 41, 45, 73, 81}, oponly: "mul"},

	{name: "int64", sn: "64", i: []int64{-0x8000000000000000, -0x7FFFFFFFFFFFFFFF,

	ss_flags int32
	ss_size  uintptr
}

type sigcontext struct {
	psw_mask uint64
	psw_addr uint64
	gregs    [16]uint64
	aregs    [16]uint32
	fpc      uint32
	fpregs   [16]uint64
}

type ucontext struct {
	uc_flags    uint64
	uc_link     *ucontext
	uc_stack    stackt
	uc_mcontext sigcontext
	uc_sigmask  uint64

	_O_CLOEXEC  = 0x80000
)

type usigset struct {
	__val [16]uint64
}

type stackt struct {
	ss_sp     *byte
	ss_flags  int32
	pad_cgo_0 [4]byte
	ss_size   uintptr
}

type sigcontext struct {
	fault_address uint64
	/* AArch64 registers */
	regs       [31]uint64
	sp         uint64
	pc         uint64
	pstate     uint64
	_pad       [8]byte // __attribute__((__aligned__(16)))

	t.Run("14", testdiv(14, func(n uint64) (uint64, uint64) { return n / 14, n % 14 }))
	t.Run("15", testdiv(15, func(n uint64) (uint64, uint64) { return n / 15, n % 15 }))
	t.Run("16", testdiv(16, func(n uint64) (uint64, uint64) { return n / 16, n % 16 }))
	t.Run("17", testdiv(17, func(n uint64) (uint64, uint64) { return n / 17, n % 17 }))

	Read_bytes                uint64
	Write_bytes               uint64
	Cancelled_write_bytes     uint64
	Nvcsw                     uint64
	Nivcsw                    uint64
	Ac_utimescaled            uint64
	Ac_stimescaled            uint64
	Cpu_scaled_run_real_total uint64
	Freepages_count           uint64
	Freepages_delay_total     uint64
	Thrashing_count           uint64
	Thrashing_delay_total     uint64

// Uint64 returns a pseudo-random 64-bit value as a uint64.
func (r *Rand) Uint64() uint64 {
	if r.s64 != nil {
		return r.s64.Uint64()
	}
	return uint64(r.Int63())>>31 | uint64(r.Int63())<<32
}

// Int31 returns a non-negative pseudo-random 31-bit integer as an int32.
func (r *Rand) Int31() int32 { return int32(r.Int63() >> 32) }

// Int returns a non-negative pseudo-random int.
func (r *Rand) Int() int {

func makedev(major uint32, minor uint32) uint64 {
	majorH := uint64(major >> 12)
	majorL := uint64(major & 0xfff)
	minorH := uint64(minor >> 8)
	minorL := uint64(minor & 0xff)
	return (majorH << 44) | (minorH << 20) | (majorL << 8) | minorL
}

func timespecFromStatxTimestamp(x statxTimestamp) Timespec {
	return Timespec{
		Sec:  x.Sec,
		Nsec: int64(x.Nsec),
	}
}

	}
	return binuptime(abs)
}

func fallback_nanotime() int64
func fallback_walltime() (sec int64, nsec int32)

//go:nosplit
func nanotime1() int64 {
	bt := vdsoClockGettime(_CLOCK_MONOTONIC)
	if bt == zeroBintime {
		return fallback_nanotime()
	}
	return int64((1e9 * uint64(bt.sec)) + ((1e9 * uint64(bt.frac>>32)) >> 32))
}

func walltime() (sec int64, nsec int32) {
	bt := vdsoClockGettime(_CLOCK_REALTIME)