}

type stat_t struct {
	Dev        uint32
	Pad0       [3]int32
	Ino        uint64
	Mode       uint32
	Nlink      uint32
	Uid        uint32
	Gid        uint32
	Rdev       uint32
	Pad1       [3]uint32
	Size       int64
	Atime      uint32
	Atime_nsec uint32
	Mtime      uint32
	Mtime_nsec uint32
	Ctime      uint32
	Ctime_nsec uint32
	Blksize    uint32
	Pad2       uint32
	Blocks     int64
}

type stat struct {
	st_dev     uint64
	st_ino     uint64
	st_mode    uint32
	st_nlink   uint32
	st_uid     uint32
	st_gid     uint32
	st_rdev    uint64
	st_size    int64
	st_atim    timespec
	st_mtim    timespec
	st_ctim    timespec
	st_blksize int32
	pad_cgo_0  [4]byte
	st_blocks  int64
	st_fstype  [16]int8
}

// created by cgo -cdefs and then converted to Go

func setTimespec(sec, nsec int64) Timespec {
	return Timespec{Sec: sec, Nsec: int32(nsec)}
}

func setTimeval(sec, usec int64) Timeval {
	return Timeval{Sec: sec, Usec: int32(usec)}
}

func SetKevent(k *Kevent_t, fd, mode, flags int) {
	k.Ident = uint32(fd)
	k.Filter = int16(mode)
	k.Flags = uint16(flags)
}

func (iov *Iovec) SetLen(length int) {
	iov.Len = uint32(length)
}

func (msghdr *Msghdr) SetControllen(length int) {

	TIOCGETA = 0x62251713
)

type Winsize struct {
	Row    uint16
	Col    uint16
	Xpixel uint16
	Ypixel uint16
}

type Termios struct {
	Iflag  uint32
	Oflag  uint32
	Cflag  uint32
	Lflag  uint32
	Cc     [20]uint8
	Ispeed int32
	Ospeed int32

	return a & (1 << 63)
}

func and_mask_3(a, b uint32) (uint32, uint32) {
	// arm/7:`BIC`,-`AND`
	a &= 0xffffaaaa
	// arm/7:`BFC`,-`AND`,-`BIC`
	b &= 0xffc003ff
	return a, b
}

// Check generation of arm64 BIC/EON/ORN instructions

func op_bic(x, y uint32) uint32 {
	// arm64:`BIC\t`,-`AND`
	return x &^ y
}

func op_eon(x, y, z uint32, a []uint32, n, m uint64) uint64 {
	// arm64:`EON\t`,-`EOR`,-`MVN`

type elfShdr struct {
	sh_name      uint32 /* Section name (string tbl index) */
	sh_type      uint32 /* Section type */
	sh_flags     uint64 /* Section flags */
	sh_addr      uint64 /* Section virtual addr at execution */
	sh_offset    uint64 /* Section file offset */
	sh_size      uint64 /* Section size in bytes */
	sh_link      uint32 /* Link to another section */
	sh_info      uint32 /* Additional section information */

}

func (c RGBA64) RGBA() (r, g, b, a uint32) {
	return uint32(c.R), uint32(c.G), uint32(c.B), uint32(c.A)
}

// NRGBA represents a non-alpha-premultiplied 32-bit color.
type NRGBA struct {
	R, G, B, A uint8
}

func (c NRGBA) RGBA() (r, g, b, a uint32) {
	r = uint32(c.R)
	r |= r << 8
	r *= uint32(c.A)
	r /= 0xff
	g = uint32(c.G)
	g |= g << 8
	g *= uint32(c.A)
	g /= 0xff
	b = uint32(c.B)
	b |= b << 8

func setTimespec(sec, nsec int64) Timespec {
	return Timespec{Sec: sec, Nsec: int32(nsec)}
}

func setTimeval(sec, usec int64) Timeval {
	return Timeval{Sec: sec, Usec: int32(usec)}
}

func SetKevent(k *Kevent_t, fd, mode, flags int) {
	k.Ident = uint32(fd)
	k.Filter = int16(mode)
	k.Flags = uint16(flags)
}

func (iov *Iovec) SetLen(length int) {
	iov.Len = uint32(length)
}

func (msghdr *Msghdr) SetControllen(length int) {

// Add p to the running checksum d.
func update(d digest, p []byte) digest {
	s1, s2 := uint32(d&0xffff), uint32(d>>16)
	for len(p) > 0 {
		var q []byte
		if len(p) > nmax {
			p, q = p[:nmax], p[nmax:]
		}
		for len(p) >= 4 {
			s1 += uint32(p[0])
			s2 += s1
			s1 += uint32(p[1])
			s2 += s1
			s1 += uint32(p[2])
			s2 += s1
			s1 += uint32(p[3])
			s2 += s1
			p = p[4:]
		}
		for _, x := range p {

// that was CSE'd.

package main

//go:noinline
func g(i uint64) uint64 {
	return uint64(uint32(i))
}

var sink uint64

func main() {
	for i := uint64(0); i < 1; i++ {
		i32 := int32(i - 1)
		sink = uint64((uint32(i32) << 1) ^ uint32((i32 >> 31)))
		x := g(uint64(i32))
		if x != uint64(uint32(i32)) {
			panic(x)
		}
	}