// Push the LR to stack, as we'll clobber it in order to
	// push the call. The function being pushed is responsible
	// for restoring the LR and setting the SP back.
	// This extra slot is known to gentraceback.
	sp := c.sp() - 4
	c.set_sp(sp)
	*(*uint32)(unsafe.Pointer(uintptr(sp))) = c.lr()
	// Set up PC and LR to pretend the function being signaled
	// calls targetPC at resumePC.

func (c *sigctxt) sigsp() uintptr    { return uintptr(c.sp()) }
func (c *sigctxt) siglr() uintptr    { return uintptr(c.lr()) }

// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
	// We arrange lr, and pc to pretend the panicking
	// function calls sigpanic directly.
	// Always save LR to stack so that panics in leaf
	// functions are correctly handled. This smashes

    ]
  >;

// This decomposition is only correct inside XLA as it ignores use_locking
// attribute.
// accum = accum * momentum + grad;
// var -= grad * lr + accum * momentum * lr
def DecomposeResourceApplyMomentumOpNesterov :
  Pattern<
    (TF_ResourceApplyMomentumOp:$src_op
       $var_resource, $accum_resource, $lr, $grad, $momentum,

	// appropriate state inside the g object. We give it the faulting
	// PC on the stack, then put it in the LR before calling sigpanic.

	// Build a 32-byte stack frame for us for this call.
	// Saved LR (none available) is at the bottom,
	// then the PC argument for setsigsegv,
	// then a copy of the LR for us to restore.
	MOVD.W $0, -32(RSP)
	MOVD R1, 8(RSP)
	MOVD R2, 16(RSP)
	BL runtime·setsigsegv(SB)
	MOVD 8(RSP), R1

		}
		table = append(table, line)
	}

	// Test that Reset returns to the first line.
	lr.Reset()
	if err := lr.Next(&line); err != nil {
		t.Fatal("lr.Next after Reset failed:", err)
	} else if line != table[0] {
		t.Fatal("lr.Next after Reset returned", line, "instead of", table[0])
	}

	// Check that entries match when seeking backward.
	for i := len(posTable) - 1; i >= 0; i-- {

		return
	}

	written, handled, err = pollSplice(&f.pfd, pfd, remain)

	if lr != nil {
		lr.N = remain - written
	}

	return written, handled, wrapSyscallError("splice", err)
}

func (f *File) copyFileRange(r io.Reader) (written int64, handled bool, err error) {
	var (
		remain int64
		lr     *io.LimitedReader
	)
	if lr, r, remain = tryLimitedReader(r); remain <= 0 {
		return 0, true, nil
	}

func spliceFrom(c *netFD, r io.Reader) (written int64, err error, handled bool) {
	var remain int64 = 1<<63 - 1 // by default, copy until EOF
	lr, ok := r.(*io.LimitedReader)
	if ok {
		remain, r = lr.N, lr.R
		if remain <= 0 {
			return 0, nil, true
		}
	}

	var s *netFD
	switch v := r.(type) {
	case *TCPConn:
		s = v.fd
	case tcpConnWithoutWriteTo:
		s = v.fd

	p("MOVD LR, R31")
	p("MOVDU R31, -%d(R1)", l.stack) // allocate frame, save PC of interrupted instruction (in LR)

	l.save()
	p("CALL ·asyncPreempt2(SB)")
	l.restore()

	p("MOVD %d(R1), R31", l.stack) // sigctxt.pushCall has pushed LR, R2, R12 (at interrupt) on stack, restore them
	p("MOVD R31, LR")
	p("MOVD %d(R1), R2", l.stack+8)

// if handled == false, sendFile performed no work.
func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
	var remain int64 = 1<<63 - 1 // by default, copy until EOF

	lr, ok := r.(*io.LimitedReader)
	if ok {
		remain, r = lr.N, lr.R
		if remain <= 0 {
			return 0, nil, true
		}
	}
	f, ok := r.(*os.File)
	if !ok {
		return 0, nil, false
	}

	sc, err := f.SyscallConn()
	if err != nil {

// license that can be found in the LICENSE file.

package runtime

// NOTE(rsc): _CONTEXT_CONTROL is actually 0x200001 and should include PC, SP, and LR.
// However, empirically, LR doesn't come along on Windows 10
// unless you also set _CONTEXT_INTEGER (0x200002).
// Without LR, we skip over the next-to-bottom function in profiles
// when the bottom function is frameless.
// So we set both here, to make a working _CONTEXT_CONTROL.