//	chku16(uint16(f64), 0)

	chku32(uint32(i8), ci8&0xffffffff)
	chku32(uint32(i16), ci16&0xffffffff)
	chku32(uint32(i32), ci32&0xffffffff)
	chku32(uint32(i64), ci64&0xffffffff)
	chku32(uint32(u8), cu8&0xffffffff)
	chku32(uint32(u16), cu16&0xffffffff)
	chku32(uint32(u32), cu32&0xffffffff)
	chku32(uint32(u64), cu64&0xffffffff)
	//	chku32(uint32(f32), 0)
	//	chku32(uint32(f64), 0)

const _PAGESIZE = 0x1000

type ureg struct {
	r0   uint32 /* general registers */
	r1   uint32 /* ... */
	r2   uint32 /* ... */
	r3   uint32 /* ... */
	r4   uint32 /* ... */
	r5   uint32 /* ... */
	r6   uint32 /* ... */
	r7   uint32 /* ... */
	r8   uint32 /* ... */
	r9   uint32 /* ... */
	r10  uint32 /* ... */
	r11  uint32 /* ... */
	r12  uint32 /* ... */
	sp   uint32
	link uint32 /* ... */
	trap uint32 /* trap type */

	AMOORW	A1, (A0), ZERO
	RET

// func And(ptr *uint32, val uint32)
TEXT ·And(SB), NOSPLIT, $0-12
	MOV	ptr+0(FP), A0
	MOVW	val+8(FP), A1
	AMOANDW	A1, (A0), ZERO
	RET

// func Or(ptr *uint32, val uint32)
TEXT ·Or(SB), NOSPLIT, $0-12
	MOV	ptr+0(FP), A0
	MOVW	val+8(FP), A1
	AMOORW	A1, (A0), ZERO
	RET

// func Or32(ptr *uint32, val uint32) uint32
TEXT ·Or32(SB), NOSPLIT, $0-20
	MOV	ptr+0(FP), A0

	ANDB	BX, (AX)
	RET

// func Or(addr *uint32, v uint32)
TEXT ·Or(SB), NOSPLIT, $0-12
	MOVQ	ptr+0(FP), AX
	MOVL	val+8(FP), BX
	LOCK
	ORL	BX, (AX)
	RET

// func And(addr *uint32, v uint32)
TEXT ·And(SB), NOSPLIT, $0-12
	MOVQ	ptr+0(FP), AX
	MOVL	val+8(FP), BX
	LOCK
	ANDL	BX, (AX)
	RET

// func Or32(addr *uint32, v uint32) old uint32
TEXT ·Or32(SB), NOSPLIT, $0-20
	MOVQ	ptr+0(FP), BX

		r:     r,
		data:  data,
		off:   uint32(off),
		start: uint32(start),
		bits:  uint32(streamStart),
		cnt:   uint32(7 - bits.LeadingZeros8(streamStart)),
	}
	return rbr, nil
}

// val is called to fetch a value of b bits.
func (rbr *reverseBitReader) val(b uint8) (uint32, error) {
	if !rbr.fetch(b) {
		return 0, rbr.r.makeEOFError(int(rbr.off))
	}

	rbr.cnt -= uint32(b)

// Returns the extra offset of a match token.
func (t token) offset() uint32 { return uint32(t) & offsetMask }

func (t token) length() uint32 { return uint32((t - matchType) >> lengthShift) }

func lengthCode(len uint32) uint32 { return lengthCodes[len] }

// Returns the offset code corresponding to a specific offset.
func offsetCode(off uint32) uint32 {

	tid1       unsafe.Pointer // *int32
	tid2       unsafe.Pointer // *int32
}

type sigset struct {
	__bits [4]uint32
}

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

type siginfo struct {
	si_signo  int32
	si_errno  int32
	si_code   int32
	si_pid    int32
	si_uid    uint32
	si_status int32
	si_addr   uint64

}

func extr4(x, x2 uint32) uint32 {
	return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
}

func extr5(x, x2 uint32) uint32 {
	return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
}

func extr6(x, x2 uint32) uint32 {
	return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
}

// check 32-bit shift masking
func mask32(x uint32) uint32 {
	return (x << 29) >> 29 // arm64:"AND\t[$]7, R[0-9]+",-"LSR",-"LSL"

	_NOTE_TRIGGER = 0x1000000
)

type sigset struct {
	__bits [4]uint32
}

type siginfo struct {
	_signo  int32
	_code   int32
	_errno  int32
	_reason [20]byte
}

type stackt struct {
	ss_sp    uintptr
	ss_size  uintptr
	ss_flags int32
}

type timespec struct {
	tv_sec  int64
	tv_nsec int32
}

//go:nosplit
func (ts *timespec) setNsec(ns int64) {

	s0 = uint32(sbox0[t0>>24])<<24 | uint32(sbox0[t1>>16&0xff])<<16 | uint32(sbox0[t2>>8&0xff])<<8 | uint32(sbox0[t3&0xff])
	s1 = uint32(sbox0[t1>>24])<<24 | uint32(sbox0[t2>>16&0xff])<<16 | uint32(sbox0[t3>>8&0xff])<<8 | uint32(sbox0[t0&0xff])
	s2 = uint32(sbox0[t2>>24])<<24 | uint32(sbox0[t3>>16&0xff])<<16 | uint32(sbox0[t0>>8&0xff])<<8 | uint32(sbox0[t1&0xff])