user: What would the C source look like for the assembly code provided here:

```asm
<log_btiln>:
  endbr64
  push   %rbx
  movapd %xmm1,%xmm4
  mov    $0x1b,%ebx
  pxor   %xmm8,%xmm8
  sub    $0x60,%rsp
  movsd  D48(%rip),%xmm6
  mov    D39(%rip),%rax
  movsd  %xmm1,0x38(%rsp)
  movapd %xmm2,%xmm1
  subsd  %xmm6,%xmm4
  movsd  %xmm0,0x28(%rsp)
  movq   %rax,%xmm3
  movapd %xmm6,%xmm5
  movsd  %xmm4,0x30(%rsp)
  nopl   0x0(%rax)
L7:
  movapd %xmm3,%xmm0
  movsd  %xmm5,0x20(%rsp)
  movsd  %xmm8,0x18(%rsp)
  movsd  %xmm1,0x10(%rsp)
  movsd  %xmm3,0x8(%rsp)
  call   <pow@plt>
  mov    D48(%rip),%rax
  movsd  0x10(%rsp),%xmm1
  movsd  0x8(%rsp),%xmm3
  movapd %xmm0,%xmm4
  movsd  0x28(%rsp),%xmm7
  movapd %xmm1,%xmm2
  movq   %rax,%xmm6
  movq   %rax,%xmm9
  movsd  0x18(%rsp),%xmm8
  subsd  %xmm3,%xmm9
  addsd  %xmm6,%xmm2
  movapd %xmm4,%xmm11
  movsd  0x20(%rsp),%xmm5
  mulsd  %xmm3,%xmm11
  movq   %rax,%xmm0
  movq   %rax,%xmm10
  divsd  %xmm3,%xmm7
  subsd  %xmm11,%xmm10
  divsd  %xmm9,%xmm0
  movapd %xmm2,%xmm9
  mulsd  %xmm4,%xmm9
  divsd  %xmm10,%xmm9
  subsd  %xmm9,%xmm0
  mulsd  0x30(%rsp),%xmm0
  subsd  %xmm0,%xmm7
  pxor   %xmm0,%xmm0
  cmpltsd %xmm7,%xmm0
  movapd %xmm0,%xmm7
  andpd  %xmm0,%xmm5
  andnpd %xmm3,%xmm7
  andpd  %xmm0,%xmm3
  andnpd %xmm8,%xmm0
  orpd   %xmm3,%xmm0
  orpd   %xmm7,%xmm5
  movapd %xmm0,%xmm3
  movapd %xmm0,%xmm8
  addsd  %xmm5,%xmm3
  mulsd  D39(%rip),%xmm3
  sub    $0x1,%ebx
  jne    L7
  movapd %xmm4,%xmm0
  movq   %rax,%xmm7
  movq   %rax,%xmm5
  movsd  %xmm1,0x58(%rsp)
  mulsd  %xmm3,%xmm0
  subsd  %xmm3,%xmm7
  movsd  %xmm2,0x50(%rsp)
  movsd  %xmm4,0x48(%rsp)
  movsd  %xmm3,0x40(%rsp)
  movsd  %xmm7,0x18(%rsp)
  subsd  %xmm0,%xmm5
  movapd %xmm3,%xmm0
  movsd  %xmm5,0x10(%rsp)
  call   <log@plt>
  movsd  0x10(%rsp),%xmm5
  movsd  %xmm0,0x8(%rsp)
  movapd %xmm5,%xmm0
  movsd  %xmm5,0x20(%rsp)
  call   <log@plt>
  movsd  0x18(%rsp),%xmm7
  movq   %xmm0,%rbx
  movapd %xmm7,%xmm0
  call   <log@plt>
  movsd  0x48(%rsp),%xmm4
  movsd  0x58(%rsp),%xmm1
  movsd  0x40(%rsp),%xmm3
  movsd  0x50(%rsp),%xmm2
  movsd  %xmm0,0x10(%rsp)
  mulsd  %xmm4,%xmm1
  mov    D48(%rip),%rax
  movsd  0x18(%rsp),%xmm7
  mulsd  %xmm4,%xmm4
  movsd  0x20(%rsp),%xmm5
  movq   %rax,%xmm6
  divsd  %xmm7,%xmm6
  divsd  %xmm3,%xmm1
  movapd %xmm6,%xmm0
  divsd  %xmm7,%xmm0
  addsd  %xmm4,%xmm1
  mulsd  %xmm2,%xmm1
  divsd  %xmm5,%xmm1
  divsd  %xmm5,%xmm1
  subsd  %xmm1,%xmm0
  movsd  0x28(%rsp),%xmm1
  mulsd  0x38(%rsp),%xmm0
  divsd  %xmm3,%xmm1
  divsd  %xmm3,%xmm1
  addsd  %xmm1,%xmm0
  mulsd  D39(%rip),%xmm0
  divsd  D36(%rip),%xmm0
  call   <log@plt>
  movsd  0x8(%rsp),%xmm4
  mulsd  0x28(%rsp),%xmm4
  movq   %rbx,%xmm1
  subsd  0x10(%rsp),%xmm1
  movapd %xmm0,%xmm2
  mulsd  0x30(%rsp),%xmm1
  movapd %xmm4,%xmm0
  subsd  %xmm1,%xmm0
  movsd  D39(%rip),%xmm1
  add    $0x60,%rsp
  pop    %rbx
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  ret
```

tool_calls: name: unpack_data
arguments: data_label: D48
data_type: f64
name: unpack_data
arguments: data_label: D39
data_type: f64
name: unpack_data
arguments: data_label: D36
data_type: f64

tool: D48: 1

tool: D39: 0.5

tool: D36: 3.1416

assistant: ```c
double log_btiln(double a, double b, double n) {
  double b1 = b - 1.;
  int i;
  int niter = ceil(log(1e8) / log(2));
  double umin = 0., umax = 1., u = 0.5;
  double un;
  for (i = 0; i < niter; i++) {
    un = pow(u, n);
    double fprim = a / u - b1 * (1. / (1. - u) - (n + 1) * un / (1. - un * u));
    if (fprim > 0)
      umin = u;
    else
      umax = u;
    u = (umin + umax) / 2.;
  }
  double neg_fsecund = a / u / u + b * (1. / (1. - u) / (1. - u) - (n + 1.) * (n * un / u + un * un) / (1 - un * u) / (1 - un * u));
  double f = a * log(u) - (b1) * (log(1 - un * u) - log(1 - u));
  return (f - log(neg_fsecund / 2. / 3.1416) * 0.5);
}
```