user: 下面的汇编指令对应的C源代码是什么:

```asm
<cftmd21>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %edi,0x5c(%rsp)
  mov    %rdx,%r15
  lea    0x0(,%rsi,4),%ebx
  mov    %ebx,0x54(%rsp)
  lea    0x0(,%rsi,8),%edx
  mov    %edx,0x58(%rsp)
  movslq %esi,%rax
  shl    $0x3,%rax
  lea    (%r15,%rax,1),%r12
  lea    (%r12,%rax,1),%r13
  lea    0x0(%r13,%rax,1),%rbp
  cmp    %edi,%edx
  jge    L50
  mov    %edx,%eax
  lea    0x10(%rcx),%rdx
  mov    %rdx,0x30(%rsp)
  add    $0x20,%rcx
  mov    %rcx,0x38(%rsp)
  mov    %eax,%ecx
  lea    (%rsi,%rax,1),%eax
  mov    %eax,0x44(%rsp)
  mov    %ebx,%eax
  add    %ecx,%eax
  add    %esi,%eax
  mov    %eax,0x50(%rsp)
  mov    %ecx,0x40(%rsp)
L51:
  mov    0x30(%rsp),%rax
  movsd  (%rax),%xmm5
  movsd  %xmm5,(%rsp)
  movsd  0x8(%rax),%xmm6
  movsd  %xmm6,0x8(%rsp)
  mov    0x38(%rsp),%rax
  mov    %rax,0x48(%rsp)
  movsd  (%rax),%xmm7
  movsd  %xmm7,0x10(%rsp)
  movsd  0x8(%rax),%xmm2
  movsd  %xmm2,0x18(%rsp)
  movapd %xmm6,%xmm0
  addsd  %xmm6,%xmm0
  movapd %xmm2,%xmm1
  mulsd  %xmm0,%xmm1
  movapd %xmm7,%xmm6
  subsd  %xmm1,%xmm6
  movsd  %xmm6,0x20(%rsp)
  mulsd  %xmm7,%xmm0
  subsd  %xmm2,%xmm0
  movsd  %xmm0,0x28(%rsp)
  mov    0x44(%rsp),%eax
  mov    %eax,%r14d
  mov    0x40(%rsp),%ecx
  cmp    %eax,%ecx
  jge    L57
  mov    %ecx,%ebx
L19:
  mov    %r15,%rdi
  call   <resetA@plt>
  mov    %rbp,%r8
  mov    %r13,%rcx
  mov    %r12,%rdx
  mov    %r15,%rsi
  movsd  0x28(%rsp),%xmm5
  movsd  0x20(%rsp),%xmm4
  movsd  0x8(%rsp),%xmm3
  movsd  (%rsp),%xmm2
  movsd  0x18(%rsp),%xmm1
  movsd  0x10(%rsp),%xmm0
  mov    %ebx,%edi
  call   <btrfly@plt>
  add    $0x2,%ebx
  cmp    %r14d,%ebx
  jl     L19
L57:
  mov    0x48(%rsp),%rax
  movsd  0x10(%rax),%xmm7
  movsd  %xmm7,0x10(%rsp)
  movsd  0x18(%rax),%xmm3
  movsd  %xmm3,0x18(%rsp)
  movsd  (%rsp),%xmm6
  movapd %xmm6,%xmm0
  addsd  %xmm6,%xmm0
  movapd %xmm3,%xmm1
  mulsd  %xmm0,%xmm1
  movapd %xmm7,%xmm6
  subsd  %xmm1,%xmm6
  movsd  %xmm6,0x20(%rsp)
  mulsd  %xmm7,%xmm0
  subsd  %xmm3,%xmm0
  movsd  %xmm0,0x28(%rsp)
  mov    0x54(%rsp),%ebx
  add    0x40(%rsp),%ebx
  mov    0x50(%rsp),%eax
  mov    %eax,%r14d
  cmp    %ebx,%eax
  jle    L16
  movsd  0x8(%rsp),%xmm4
  xorpd  D9(%rip),%xmm4
  movsd  %xmm4,0x8(%rsp)
L44:
  mov    %r15,%rdi
  call   <resetA@plt>
  mov    %rbp,%r8
  mov    %r13,%rcx
  mov    %r12,%rdx
  mov    %r15,%rsi
  movsd  0x28(%rsp),%xmm5
  movsd  0x20(%rsp),%xmm4
  movsd  (%rsp),%xmm3
  movsd  0x8(%rsp),%xmm2
  movsd  0x18(%rsp),%xmm1
  movsd  0x10(%rsp),%xmm0
  mov    %ebx,%edi
  call   <btrfly@plt>
  add    $0x2,%ebx
  cmp    %r14d,%ebx
  jl     L44
L16:
  mov    0x58(%rsp),%edx
  add    %edx,0x40(%rsp)
  mov    0x40(%rsp),%eax
  addq   $0x10,0x30(%rsp)
  addq   $0x20,0x38(%rsp)
  add    %edx,0x44(%rsp)
  add    %edx,0x50(%rsp)
  cmp    %eax,0x5c(%rsp)
  jg     L51
L50:
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: parse_data
arguments: tag: D9
type_guessed: byte[16]

tool: {"D9": [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]}

assistant: ```c
void cftmd21(int n, int l, double *a, double *w) {
  int j, k, k1;
  int m = l << 2;
  int m2 = 2 * m;
  int m3 = 3 * m;
  double *v = w + 1;
  double *b = a + l;
  double *c = a + l + l;
  double *d = a + l + l + l;
  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;
#pragma mta use 100 streams
#pragma mta assert no dependence
    for (j = k; j < k + l; j += 2) {
      resetA(a);
      btrfly(j, wk1r, wk1i, wk2r, wk2i, wk3r, wk3i, a, b, c, d);
    }
    wk1r = w[k1 + k1 + 2];
    wk1i = v[k1 + k1 + 2];
    wk3r = wk1r - 2 * wk2r * wk1i;
    wk3i = 2 * wk2r * wk1r - wk1i;
#pragma mta use 100 streams
#pragma mta assert no dependence
    for (j = k + m; j < k + m + l; j += 2) {
      resetA(a);
      btrfly(j, wk1r, wk1i, -wk2i, wk2r, wk3r, wk3i, a, b, c, d);
    }
  }
}
```