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

```asm
<cftbsub>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rsi,%rbx
  cmp    $0x8,%rdi
  ja     L40
  mov    $0x2,%ebp
  je     L44
L95:
  lea    0x4(%rbx,%rbp,4),%rdx
  mov    $0x0,%eax
  movss  D15(%rip),%xmm5
L126:
  movss  (%rbx,%rax,4),%xmm1
  movss  -0x4(%rdx),%xmm3
  movss  0x4(%rbx,%rax,4),%xmm0
  movss  (%rdx),%xmm2
  subss  %xmm0,%xmm2
  movaps %xmm1,%xmm4
  addss  %xmm3,%xmm4
  movss  %xmm4,(%rbx,%rax,4)
  xorps  %xmm5,%xmm0
  subss  (%rdx),%xmm0
  movss  %xmm0,0x4(%rbx,%rax,4)
  subss  %xmm3,%xmm1
  movss  %xmm1,-0x4(%rdx)
  movss  %xmm2,(%rdx)
  add    $0x2,%rax
  add    $0x8,%rdx
  cmp    %rbp,%rax
  jb     L126
L149:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L40:
  mov    %rdi,%r12
  mov    %rdx,%r13
  call   <cft1st@plt>
  cmp    $0x20,%r12
  jbe    L111
  mov    $0x8,%esi
  mov    $0x20,%ebp
  jmp    L71
L21:
  mov    %rax,%rbp
L71:
  mov    %r13,%rcx
  mov    %rbx,%rdx
  mov    %r12,%rdi
  call   <cftmdl@plt>
  lea    0x0(,%rbp,4),%rax
  mov    %rbp,%rsi
  cmp    %r12,%rax
  jb     L21
  je     L19
  test   %rbp,%rbp
  jne    L95
  jmp    L149
L19:
  test   %rbp,%rbp
  jne    L98
  jmp    L149
L44:
  mov    $0x2,%ebp
L98:
  lea    0x0(,%rbp,4),%rax
  lea    (%rbx,%rax,1),%rdx
  mov    %rdx,%rsi
  add    %rax,%rdx
  mov    %rdx,%rcx
  add    %rax,%rdx
  mov    $0x0,%eax
  movss  D15(%rip),%xmm10
L112:
  movss  (%rbx,%rax,4),%xmm1
  movss  (%rsi),%xmm4
  movaps %xmm1,%xmm5
  addss  %xmm4,%xmm5
  movss  0x4(%rbx,%rax,4),%xmm3
  movss  0x4(%rsi),%xmm0
  movaps %xmm3,%xmm2
  xorps  %xmm10,%xmm2
  subss  %xmm0,%xmm2
  subss  %xmm4,%xmm1
  subss  %xmm3,%xmm0
  movss  (%rcx),%xmm3
  movss  (%rdx),%xmm9
  movaps %xmm3,%xmm7
  addss  %xmm9,%xmm7
  movss  0x4(%rcx),%xmm4
  movss  0x4(%rdx),%xmm8
  movaps %xmm4,%xmm6
  addss  %xmm8,%xmm6
  subss  %xmm9,%xmm3
  subss  %xmm8,%xmm4
  movaps %xmm5,%xmm8
  addss  %xmm7,%xmm8
  movss  %xmm8,(%rbx,%rax,4)
  movaps %xmm2,%xmm8
  subss  %xmm6,%xmm8
  movss  %xmm8,0x4(%rbx,%rax,4)
  subss  %xmm7,%xmm5
  movss  %xmm5,(%rcx)
  addss  %xmm6,%xmm2
  movss  %xmm2,0x4(%rcx)
  movaps %xmm1,%xmm2
  subss  %xmm4,%xmm2
  movss  %xmm2,(%rsi)
  movaps %xmm0,%xmm2
  subss  %xmm3,%xmm2
  movss  %xmm2,0x4(%rsi)
  addss  %xmm4,%xmm1
  movss  %xmm1,(%rdx)
  addss  %xmm3,%xmm0
  movss  %xmm0,0x4(%rdx)
  add    $0x2,%rax
  add    $0x8,%rsi
  add    $0x8,%rcx
  add    $0x8,%rdx
  cmp    %rbp,%rax
  jb     L112
  jmp    L149
L111:
  mov    $0x8,%ebp
  jne    L95
  mov    $0x8,%ebp
  jmp    L98
```

tool_calls: name: retrieve_data
arguments: data_label: D15
type_infered: byte[4]

tool: {"D15": [0x00,0x00,0x00,0x80]}

assistant: ```c
void cftbsub(size_t n, float *a, float *w) {
  size_t j, j1, j2, j3, l;
  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
  l = 2;
  if (n > 8) {
    cft1st(n, a, w);
    l = 8;
    while ((l << 2) < n) {
      cftmdl(n, l, a, w);
      l <<= 2;
    }
  }
  if ((l << 2) == n) {
    for (j = 0; j < l; j += 2) {
      j1 = j + l;
      j2 = j1 + l;
      j3 = j2 + l;
      x0r = a[j] + a[j1];
      x0i = -a[j + 1] - a[j1 + 1];
      x1r = a[j] - a[j1];
      x1i = -a[j + 1] + a[j1 + 1];
      x2r = a[j2] + a[j3];
      x2i = a[j2 + 1] + a[j3 + 1];
      x3r = a[j2] - a[j3];
      x3i = a[j2 + 1] - a[j3 + 1];
      a[j] = x0r + x2r;
      a[j + 1] = x0i - x2i;
      a[j2] = x0r - x2r;
      a[j2 + 1] = x0i + x2i;
      a[j1] = x1r - x3i;
      a[j1 + 1] = x1i - x3r;
      a[j3] = x1r + x3i;
      a[j3 + 1] = x1i + x3r;
    }
  } else {
    for (j = 0; j < l; j += 2) {
      j1 = j + l;
      x0r = a[j] - a[j1];
      x0i = -a[j + 1] + a[j1 + 1];
      a[j] += a[j1];
      a[j + 1] = -a[j + 1] - a[j1 + 1];
      a[j1] = x0r;
      a[j1 + 1] = x0i;
    }
  }
}
```