ab.buf[ab.off+1] = byte(v >> 8)
	ab.buf[ab.off+2] = byte(v >> 16)
	ab.buf[ab.off+3] = byte(v >> 24)
	ab.off += 4
}

// PutInt64 writes v into the buffer using little-endian encoding.
func (ab *AsmBuf) PutInt64(v int64) {
	ab.buf[ab.off+0] = byte(v)
	ab.buf[ab.off+1] = byte(v >> 8)
	ab.buf[ab.off+2] = byte(v >> 16)
	ab.buf[ab.off+3] = byte(v >> 24)
	ab.buf[ab.off+4] = byte(v >> 32)

package syscall

const (
	SYS_EXIT           = 1   // { void sys_exit(int rval); }
	SYS_FORK           = 2   // { int sys_fork(void); }
	SYS_READ           = 3   // { ssize_t sys_read(int fd, void *buf, size_t nbyte); }
	SYS_WRITE          = 4   // { ssize_t sys_write(int fd, const void *buf, \
	SYS_OPEN           = 5   // { int sys_open(const char *path, \
	SYS_CLOSE          = 6   // { int sys_close(int fd); }

//
//go:nowritebarrier
//go:nosplit
func subtractb(p *byte, n uintptr) *byte {
	// Note: wrote out full expression instead of calling add(p, -n)
	// to reduce the number of temporaries generated by the
	// compiler for this trivial expression during inlining.
	return (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(p)) - n))
}

// add1 returns the byte pointer p+1.
//
//go:nowritebarrier
//go:nosplit

// split the stack, or acquire mutexes). We can't call RawSyscall
// because it's not safe even for BSD-subsystem calls.
//
//go:norace
func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
	// Declare all variables at top in case any
	// declarations require heap allocation (e.g., err1).
	var (
		r1              uintptr

	b[0] = byte(v)
	b[1] = byte(v >> 8)
	b[2] = byte(v >> 16)
	b[3] = byte(v >> 24)
	b[4] = byte(v >> 32)
	b[5] = byte(v >> 40)
	b[6] = byte(v >> 48)
	b[7] = byte(v >> 56)
}

func LeAppendUint64(b []byte, v uint64) []byte {
	return append(b,
		byte(v),
		byte(v>>8),
		byte(v>>16),
		byte(v>>24),
		byte(v>>32),
		byte(v>>40),
		byte(v>>48),
		byte(v>>56),
	)
}

	nop()                // spill/restore ROLL
	b[0] = byte(y >> 24) // use ROLL
	b[1] = byte(y >> 16)
	b[2] = byte(y >> 8)
	b[3] = byte(y)
}

//go:noinline
func f64(p *uint8, b []byte) {
	_ = b[7]             // bounds check
	x := *p              // load a byte
	y := uint64(x)       // zero extend to 64 bits
	b[0] = byte(y >> 56) // compute ROLQ
	b[1] = byte(y >> 48)
	b[2] = byte(y >> 40)
	b[3] = byte(y >> 32)

)

type CryptTest struct {
	key []byte
	in  []byte
	out []byte
}

// some custom tests for DES
var encryptDESTests = []CryptTest{
	{
		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
		[]byte{0x8c, 0xa6, 0x4d, 0xe9, 0xc1, 0xb1, 0x23, 0xa7}},
	{
		[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
		[]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},

	BYTE $0x7c; BYTE $0xc1; BYTE $0xc2; BYTE $0xc3
	BYTE $0xc4; BYTE $0xc5; BYTE $0xc6; BYTE $0xc7
	BYTE $0xc8; BYTE $0xc9; BYTE $0xd1; BYTE $0xd2
	BYTE $0xd3; BYTE $0xd4; BYTE $0xd5; BYTE $0xd6
	BYTE $0xd7; BYTE $0xd8; BYTE $0xd9; BYTE $0xe2
	BYTE $0xe3; BYTE $0xe4; BYTE $0xe5; BYTE $0xe6
	BYTE $0xe7; BYTE $0xe8; BYTE $0xe9; BYTE $0xad
	BYTE $0xe0; BYTE $0xbd; BYTE $0x5f; BYTE $0x6d
	BYTE $0x79; BYTE $0x81; BYTE $0x82; BYTE $0x83

              0x13579bdf,
              null,
              "df9b5713"),
          new ExpectedHashCode(
              new byte[] {(byte) 0xcd, (byte) 0xab, (byte) 0x00, (byte) 0x00},
              0x0000abcd,
              null,
              "cdab0000"),
          new ExpectedHashCode(
              new byte[] {
                (byte) 0xef, (byte) 0xcd, (byte) 0xab, (byte) 0x00,

  }

  @J2ktIncompatible // b/285319375
  public void testLexicographicalComparator() {
    List<byte[]> ordered =
        Arrays.asList(
            new byte[] {},
            new byte[] {LEAST},
            new byte[] {LEAST, LEAST},
            new byte[] {LEAST, (byte) 1},
            new byte[] {(byte) 1},
            new byte[] {(byte) 1, LEAST},