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

```asm
<cftmd2>:
  endbr64
  push   %r15
  lea    0x0(,%rsi,4),%eax
  push   %r14
  mov    %edi,%r14d
  push   %r13
  lea    0x0(,%rsi,8),%r13d
  push   %r12
  mov    %rdx,%r12
  mov    %esi,%edx
  push   %rbp
  mov    %rcx,%rbp
  push   %rbx
  mov    %esi,%ebx
  mov    %edi,%esi
  sub    $0x58,%rsp
  mov    %edi,0x40(%rsp)
  lea    D21(%rip),%rdi
  mov    %eax,0x8(%rsp)
  mov    %r13d,0x4(%rsp)
  call   <printf@plt>
  mov    %rbp,%rcx
  mov    %r12,%rdx
  mov    %ebx,%esi
  mov    %r14d,%edi
  call   <cftmd0@plt>
  cmp    %r14d,%r13d
  jge    L6
  test   %r14d,%r14d
  lea    0x7(%r14),%eax
  cmovns %r14d,%eax
  sar    $0x3,%eax
  cmp    %r13d,%eax
  jle    L32
  test   %ebx,%ebx
  jle    L6
  movslq %ebx,%r13
  mov    0x8(%rsp),%eax
  lea    -0x1(%rbx),%r8d
  movl   $0x0,0x44(%rsp)
  shl    $0x3,%r13
  and    $0xfffffffe,%r8d
  lea    (%r12,%r13,1),%r15
  mov    %eax,0x48(%rsp)
  lea    0x2(%r8),%eax
  lea    (%r15,%r13,1),%r14
  mov    %eax,0x4c(%rsp)
  add    %r14,%r13
  mov    %r13,0x8(%rsp)
  nopl   0x0(%rax,%rax,1)
L22:
  xor    %r10d,%r10d
  mov    0x4(%rsp),%ebx
  mov    %rbp,%r13
  mov    %r10,%rbp
  nopl   (%rax)
L9:
  movsd  0x18(%r13,%rbp,1),%xmm3
  movsd  0x20(%r13,%rbp,2),%xmm0
  mov    %r12,%rdi
  movsd  0x28(%r13,%rbp,2),%xmm1
  movsd  0x10(%r13,%rbp,1),%xmm2
  add    $0x10,%rbp
  movapd %xmm3,%xmm5
  movapd %xmm0,%xmm4
  movsd  %xmm3,0x30(%rsp)
  addsd  %xmm3,%xmm5
  movsd  %xmm2,0x38(%rsp)
  movsd  %xmm0,0x20(%rsp)
  movsd  %xmm1,0x18(%rsp)
  movapd %xmm5,%xmm6
  mulsd  %xmm1,%xmm6
  mulsd  %xmm0,%xmm5
  subsd  %xmm6,%xmm4
  subsd  %xmm1,%xmm5
  movsd  %xmm4,0x28(%rsp)
  movsd  %xmm5,0x10(%rsp)
  call   <resetA@plt>
  mov    0x44(%rsp),%eax
  mov    0x8(%rsp),%r8
  mov    %r14,%rcx
  movsd  0x10(%rsp),%xmm5
  movsd  0x28(%rsp),%xmm4
  mov    %r15,%rdx
  mov    %r12,%rsi
  movsd  0x30(%rsp),%xmm3
  movsd  0x38(%rsp),%xmm2
  lea    (%rax,%rbx,1),%edi
  movsd  0x18(%rsp),%xmm1
  movsd  0x20(%rsp),%xmm0
  call   <btrfly@plt>
  add    0x4(%rsp),%ebx
  cmp    %ebx,0x40(%rsp)
  jg     L9
  xor    %r10d,%r10d
  mov    0x4(%rsp),%ebx
  mov    %r10,%rbp
  nopw   0x0(%rax,%rax,1)
L26:
  movsd  0x10(%r13,%rbp,1),%xmm3
  movsd  0x30(%r13,%rbp,2),%xmm0
  mov    %r12,%rdi
  movsd  0x38(%r13,%rbp,2),%xmm1
  movsd  0x18(%r13,%rbp,1),%xmm2
  add    $0x10,%rbp
  movapd %xmm3,%xmm5
  movapd %xmm0,%xmm4
  movsd  %xmm3,0x30(%rsp)
  addsd  %xmm3,%xmm5
  movsd  %xmm2,0x38(%rsp)
  movsd  %xmm0,0x20(%rsp)
  movsd  %xmm1,0x18(%rsp)
  movapd %xmm5,%xmm6
  mulsd  %xmm1,%xmm6
  mulsd  %xmm0,%xmm5
  subsd  %xmm6,%xmm4
  subsd  %xmm1,%xmm5
  movsd  %xmm4,0x28(%rsp)
  movsd  %xmm5,0x10(%rsp)
  call   <resetA@plt>
  mov    0x48(%rsp),%eax
  mov    0x8(%rsp),%r8
  mov    %r14,%rcx
  movsd  0x38(%rsp),%xmm2
  movsd  0x10(%rsp),%xmm5
  mov    %r15,%rdx
  mov    %r12,%rsi
  movsd  0x28(%rsp),%xmm4
  movsd  0x30(%rsp),%xmm3
  lea    (%rbx,%rax,1),%edi
  xorpd  D2(%rip),%xmm2
  movsd  0x18(%rsp),%xmm1
  movsd  0x20(%rsp),%xmm0
  call   <btrfly@plt>
  add    0x4(%rsp),%ebx
  cmp    %ebx,0x40(%rsp)
  jg     L26
  addl   $0x2,0x44(%rsp)
  mov    %r13,%rbp
  mov    0x44(%rsp),%eax
  addl   $0x2,0x48(%rsp)
  cmp    0x4c(%rsp),%eax
  jne    L22
L6:
  add    $0x58,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L32:
  mov    0x40(%rsp),%r14d
  mov    %ebx,%edx
  lea    D19(%rip),%rdi
  mov    %r14d,%esi
  call   <printf@plt>
  add    $0x58,%rsp
  mov    %rbp,%rcx
  mov    %r12,%rdx
  mov    %ebx,%esi
  mov    %r14d,%edi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    10d0 <cftmd21@plt>
```

tool_calls: name: unpack_data
arguments: data_label: D21
datatype: string
name: unpack_data
arguments: data_label: D2
datatype: byte[16]
name: unpack_data
arguments: data_label: D19
datatype: string

tool: D21:   cftmd0(n=%d, l=%d, a, w)


tool: {"D2": [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]}

tool: D19:   cftmd21(n=%d, l=%d, a, w)


assistant: ```c
void cftmd2(int n, int l, double *a, double *w) {
  int j, k, k1;
  int m = l << 2;
  int m2 = 2 * m;
  double *v = w + 1;
  double *b = a + l;
  double *c = a + l + l;
  double *d = a + l + l + l;
  printf("  cftmd0(n=%d, l=%d, a, w)\n", n, l);
  cftmd0(n, l, a, w);
  if (m2 >= n)
    return;
  if (m2 >= n / 8) {
    printf("  cftmd21(n=%d, l=%d, a, w)\n", n, l);
    cftmd21(n, l, a, w);
    return;
  }
#pragma mta use 100 streams
#pragma mta assert no dependence
  for (j = 0; j < l; j += 2) {
#pragma mta assert no dependence
    for (k = m2, k1 = 2; k < n; k += m2, k1 += 2) {
      double wk2r = w[k1];
      double wk2i = v[k1];
      double wk1r = w[k1 + k1];
      double wk1i = v[k1 + k1];
      double wk3r = wk1r - 2 * wk2i * wk1i;
      double wk3i = 2 * wk2i * wk1r - wk1i;
      resetA(a);
      btrfly(j + k, wk1r, wk1i, wk2r, wk2i, wk3r, wk3i, a, b, c, d);
    }
#pragma mta assert no dependence
    for (k = m2, k1 = 2; k < n; k += m2, k1 += 2) {
      double wk2r = w[k1];
      double wk2i = v[k1];
      double wk1r = w[k1 + k1 + 2];
      double wk1i = v[k1 + k1 + 2];
      double wk3r = wk1r - 2 * wk2r * wk1i;
      double wk3i = 2 * wk2r * wk1r - wk1i;
      resetA(a);
      btrfly(j + k + m, wk1r, wk1i, -wk2i, wk2r, wk3r, wk3i, a, b, c, d);
    }
  }
}
```