user: What is the c source code of the assembly code below?

```asm
<rftbsub>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  add    $0xffffffffffffff80,%rsp
  mov    %edi,-0x74(%rbp)
  mov    %rsi,-0x80(%rbp)
  pxor   %xmm1,%xmm1
  cvtsi2sdl -0x74(%rbp),%xmm1
  movsd  D38(%rip),%xmm0
  divsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x60(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x58(%rbp)
  mov    -0x40(%rbp),%rax
  movq   %rax,%xmm0
  call   <cos@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x48(%rbp)
  mov    -0x40(%rbp),%rax
  movq   %rax,%xmm0
  call   <sin@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x50(%rbp)
  movsd  -0x48(%rbp),%xmm0
  mulsd  -0x50(%rbp),%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x50(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  movsd  %xmm0,-0x50(%rbp)
  movsd  -0x50(%rbp),%xmm0
  movapd %xmm0,%xmm1
  addsd  %xmm0,%xmm1
  movsd  D7(%rip),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x48(%rbp),%xmm0
  addsd  %xmm0,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  movsd  -0x30(%rbp),%xmm0
  addsd  %xmm0,%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x74(%rbp),%eax
  sar    %eax
  mov    %eax,-0x70(%rbp)
L4:
  mov    -0x70(%rbp),%eax
  sub    $0x100,%eax
  mov    %eax,-0x6c(%rbp)
  cmpl   $0x3,-0x6c(%rbp)
  jg     L20
  movl   $0x4,-0x6c(%rbp)
L20:
  mov    -0x70(%rbp),%eax
  sub    $0x4,%eax
  mov    %eax,-0x68(%rbp)
  jmp    L31
L30:
  mov    -0x74(%rbp),%eax
  sub    -0x68(%rbp),%eax
  mov    %eax,-0x64(%rbp)
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x2,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x64(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x3,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x64(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x18(%rbp)
  movsd  -0x50(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x20(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x50(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  movsd  -0x48(%rbp),%xmm1
  mulsd  -0x20(%rbp),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x8(%rbp)
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x2,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x2,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x3,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x3,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x64(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x64(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  addsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x64(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x64(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  movsd  -0x28(%rbp),%xmm0
  mulsd  -0x48(%rbp),%xmm0
  movsd  -0x60(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x60(%rbp)
  movsd  D76(%rip),%xmm0
  subsd  -0x50(%rbp),%xmm0
  mulsd  -0x28(%rbp),%xmm0
  movsd  -0x58(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x58(%rbp)
  mov    -0x68(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x64(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x64(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x18(%rbp)
  movsd  -0x60(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x20(%rbp),%xmm1
  movsd  -0x58(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x60(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  movsd  -0x58(%rbp),%xmm1
  mulsd  -0x20(%rbp),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x8(%rbp)
  mov    -0x68(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x68(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x68(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x64(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x64(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  addsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x64(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x64(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  movsd  -0x28(%rbp),%xmm0
  mulsd  -0x58(%rbp),%xmm0
  movsd  -0x50(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x50(%rbp)
  movsd  D76(%rip),%xmm0
  subsd  -0x60(%rbp),%xmm0
  mulsd  -0x28(%rbp),%xmm0
  movsd  -0x48(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  subl   $0x4,-0x68(%rbp)
L31:
  mov    -0x68(%rbp),%eax
  cmp    -0x6c(%rbp),%eax
  jge    L30
  cmpl   $0x4,-0x6c(%rbp)
  je     L6
  pxor   %xmm0,%xmm0
  cvtsi2sdl -0x6c(%rbp),%xmm0
  mulsd  -0x40(%rbp),%xmm0
  movq   %xmm0,%rax
  movq   %rax,%xmm0
  call   <sin@plt>
  movsd  D76(%rip),%xmm1
  mulsd  %xmm1,%xmm0
  movsd  %xmm0,-0x60(%rbp)
  pxor   %xmm0,%xmm0
  cvtsi2sdl -0x6c(%rbp),%xmm0
  mulsd  -0x40(%rbp),%xmm0
  movq   %xmm0,%rax
  movq   %rax,%xmm0
  call   <cos@plt>
  movsd  D76(%rip),%xmm1
  mulsd  %xmm1,%xmm0
  movsd  %xmm0,-0x58(%rbp)
  movsd  -0x60(%rbp),%xmm0
  mulsd  -0x38(%rbp),%xmm0
  movsd  -0x58(%rbp),%xmm1
  movapd %xmm1,%xmm2
  mulsd  -0x30(%rbp),%xmm2
  movapd %xmm0,%xmm1
  subsd  %xmm2,%xmm1
  movsd  D76(%rip),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x50(%rbp)
  movsd  -0x60(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x30(%rbp),%xmm1
  movsd  -0x58(%rbp),%xmm0
  mulsd  -0x38(%rbp),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  D76(%rip),%xmm0
  subsd  -0x60(%rbp),%xmm0
  movsd  %xmm0,-0x60(%rbp)
  mov    -0x6c(%rbp),%eax
  mov    %eax,-0x70(%rbp)
  jmp    L4
L6:
  nop
  mov    -0x80(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm0
  mov    -0x74(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x80(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  mov    -0x74(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x18(%rbp)
  movsd  -0x50(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x20(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x50(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  movsd  -0x48(%rbp),%xmm1
  mulsd  -0x20(%rbp),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x8(%rbp)
  mov    -0x80(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm0
  mov    -0x80(%rbp),%rax
  add    $0x10,%rax
  subsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x80(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm0
  mov    -0x80(%rbp),%rax
  add    $0x18,%rax
  subsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x74(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x74(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x10(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  addsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x74(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x74(%rbp),%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  subsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  nop
  leave
  ret
```

tool_calls: name: parse_data
arguments: tag: D38
type_guessed: byte[8]
name: parse_data
arguments: tag: D7
type_guessed: byte[8]
name: parse_data
arguments: tag: D76
type_guessed: f64

tool: {"D38": [0x18,0x2d,0x44,0x54,0xfb,0x21,0x09,0x40]}

tool: {"D7": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

tool: D76: 0.5

assistant: ```c
void rftbsub(int n, double *a) {
  int i, i0, j, k;
  double ec, w1r, w1i, wkr, wki, wdr, wdi, ss, xr, xi, yr, yi;
  ec = 2 * ((double)1.570796326794896619231321691639751442098584) / n;
  wkr = 0;
  wki = 0;
  wdi = cos(ec);
  wdr = sin(ec);
  wdi *= wdr;
  wdr *= wdr;
  w1r = 1 - 2 * wdr;
  w1i = 2 * wdi;
  ss = 2 * w1i;
  i = n >> 1;
  for (;;) {
    i0 = i - 4 * 64;
    if (i0 < 4) {
      i0 = 4;
    }
    for (j = i - 4; j >= i0; j -= 4) {
      k = n - j;
      xr = a[j + 2] - a[k - 2];
      xi = a[j + 3] + a[k - 1];
      yr = wdr * xr + wdi * xi;
      yi = wdr * xi - wdi * xr;
      a[j + 2] -= yr;
      a[j + 3] -= yi;
      a[k - 2] += yr;
      a[k - 1] -= yi;
      wkr += ss * wdi;
      wki += ss * (((double)0.5) - wdr);
      xr = a[j] - a[k];
      xi = a[j + 1] + a[k + 1];
      yr = wkr * xr + wki * xi;
      yi = wkr * xi - wki * xr;
      a[j] -= yr;
      a[j + 1] -= yi;
      a[k] += yr;
      a[k + 1] -= yi;
      wdr += ss * wki;
      wdi += ss * (((double)0.5) - wkr);
    }
    if (i0 == 4) {
      break;
    }
    wkr = ((double)0.5) * sin(ec * i0);
    wki = ((double)0.5) * cos(ec * i0);
    wdr = ((double)0.5) - (wkr * w1r - wki * w1i);
    wdi = wkr * w1i + wki * w1r;
    wkr = ((double)0.5) - wkr;
    i = i0;
  }
  xr = a[2] - a[n - 2];
  xi = a[3] + a[n - 1];
  yr = wdr * xr + wdi * xi;
  yi = wdr * xi - wdi * xr;
  a[2] -= yr;
  a[3] -= yi;
  a[n - 2] += yr;
  a[n - 1] -= yi;
}
```