// determine sign
	neg, err := scanSign(r)
	if err != nil {
		return nil, 0, err
	}

	// determine mantissa
	z.abs, base, _, err = z.abs.scan(r, base, false)
	if err != nil {
		return nil, base, err
	}
	z.neg = len(z.abs) > 0 && neg // 0 has no sign

	return z, base, nil
}

func scanSign(r io.ByteScanner) (neg bool, err error) {
	var ch byte

		return fmt.Errorf("Int.GobDecode: encoding version %d not supported", b>>1)
	}
	z.neg = b&1 != 0
	z.abs = z.abs.setBytes(buf[1:])
	return nil
}

// MarshalText implements the [encoding.TextMarshaler] interface.
func (x *Int) MarshalText() (text []byte, err error) {
	if x == nil {
		return []byte("<nil>"), nil
	}
	return x.abs.itoa(x.neg, 10), nil
}

// UnmarshalText implements the [encoding.TextUnmarshaler] interface.

//go:noinline
func f7and(a bool, b bool) bool {
	return a && b // ERROR "converted OpPhi to AndB$"
}

//go:noinline
func f8(s string) (string, bool) {
	neg := false
	if s[0] == '-' {    // ERROR "converted OpPhi to Copy$"
		neg = true
		s = s[1:]
	}
	return s, neg
}

var d int

//go:noinline
func f9(a, b int) bool {
	c := false
	if a < 0 {          // ERROR "converted OpPhi to Copy$"
		if b < 0 {

		a = append(a, r.Lsh(r, t.bits-1).Sub(r, big.NewInt(1)))
		r = big.NewInt(1)
		a = append(a, r.Lsh(r, t.bits-1).Sub(r, big.NewInt(2)))
		r = big.NewInt(1)
		a = append(a, r.Lsh(r, t.bits-1).Neg(r))
		r = big.NewInt(1)
		a = append(a, r.Lsh(r, t.bits-1).Neg(r).Add(r, big.NewInt(1)))
	} else {
		r := big.NewInt(1)
		a = append(a, r.Lsh(r, t.bits).Sub(r, big.NewInt(1)))
		r = big.NewInt(1)
		a = append(a, r.Lsh(r, t.bits).Sub(r, big.NewInt(2)))

  %3 = "tfl.div"(%2, %1) {fused_activation_function = "NONE"} : (tensor<4xf32>, tensor<4xf32>) -> tensor<4xf32> loc("div")
  %4 = "tfl.exp"(%3) : (tensor<4xf32>) -> tensor<4xf32> loc("exp")
  %5 = "tfl.neg"(%4) : (tensor<4xf32>) -> tensor<4xf32> loc("neg")
  func.return %5 : tensor<4xf32>

  %3 = "tfl.div"(%2, %1) {fused_activation_function = "NONE"} : (tensor<4xf32>, tensor<4xf32>) -> tensor<4xf32> loc("div")
  %4 = "tfl.exp"(%3) : (tensor<4xf32>) -> tensor<4xf32> loc("exp")
  %5 = "tfl.neg"(%4) : (tensor<4xf32>) -> tensor<4xf32> loc("neg")
  func.return %5 : tensor<4xf32>

	MOVD	a2+16(FP), R3
	MOVD	a3+24(FP), R4
	MOVD	$0, R5
	MOVD	$0, R6
	MOVD	$0, R7
	MOVD	trap+0(FP), R1	// syscall entry
	SYSCALL
	MOVD	$0xfffffffffffff001, R8
	CMPUBLT	R2, R8, ok2
	MOVD	$-1, r1+32(FP)
	NEG	R2, R2
	MOVD	R2, err+40(FP)	// errno
	RET
ok2:
	MOVD	R2, r1+32(FP)
	MOVD	$0, err+40(FP)	// errno
	RET

// func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr)

// instead we use the big.Float and ast.File types as they provide a suitable mix of exported and un-
// exported fields and methods.

func _() {
	var x *big.Float
	_ = x.Neg  // OK
	_ = x.NeG  // ERROR "x.NeG undefined (type *big.Float has no field or method NeG, but does have method Neg)"
	_ = x.Form // ERROR "x.Form undefined (type *big.Float has no field or method Form, but does have unexported field form)"

	MOVD	p+8(FP), R1		// arg 2 - buf
	MOVW	n+16(FP), R2		// arg 3 - count
	SVC	$SYS_read
	BCC	ok
	NEG	R0, R0
ok:
	MOVW	R0, ret+24(FP)
	RET

// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
	ADD	$16, RSP, R0
	MOVW	flags+0(FP), R1
	SVC	$SYS_pipe2
	BCC	pipe2ok
	NEG	R0, R0
pipe2ok:
	MOVW	R0, errno+16(FP)
	RET

TEXT runtime·write1(SB),NOSPLIT,$-8

    absl::Span<AbstractTensorHandle*> outputs) {
  Tape tape(/*persistent=*/false);
  tape.Watch(inputs[0]);
  AbstractTensorHandle* neg_output;
  TF_RETURN_IF_ERROR(ops::Neg(ctx, inputs[0], &neg_output, "Neg"));
  tape.RecordOperation(inputs, {neg_output}, nullptr, "Neg");
  return tape.ComputeGradient(ctx,
                              /*targets=*/{neg_output},
                              /*sources=*/inputs,