user: 请从给定的汇编指令推导出C源代码:

```asm
<kbfft>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %edi,0x2c(%rsp)
  mov    %esi,0x28(%rsp)
  mov    %edx,%r14d
  mov    %rcx,%rbx
  mov    %r8,%rbp
  mov    %r9,%r12
  mov    0x70(%rsp),%r13
  test   %esi,%esi
  jle    L22
  mov    %esi,%r15d
  mov    %r13,%r8
  mov    $0x0,%r10d
  mov    $0x0,%r11d
  jmp    L123
L161:
  mov    %edx,%eax
  mov    %edx,%edi
  shr    $0x1f,%edi
  add    %edi,%edx
  sar    %edx
  mov    %eax,%edi
  shr    $0x1f,%edi
  add    %edi,%eax
  and    $0x1,%eax
  sub    %edi,%eax
  lea    (%rax,%rcx,2),%ecx
  movslq %ecx,%rax
  movss  (%rbx,%rax,4),%xmm0
  movss  %xmm0,(%r9)
  movss  0x0(%rbp,%rax,4),%xmm0
  movss  %xmm0,(%r8)
  add    $0x1,%esi
  cmp    %esi,%r14d
  jne    L161
L4:
  add    $0x1,%r10d
  add    $0x4,%r9
  add    $0x4,%r8
  cmp    %r10d,%r15d
  je     L22
L123:
  mov    %r10d,%edx
  mov    $0x0,%esi
  mov    %r11d,%ecx
  test   %r14d,%r14d
  jg     L161
  jmp    L4
L22:
  movl   $0x3f800000,(%rbx)
  movl   $0x0,0x0(%rbp)
  pxor   %xmm7,%xmm7
  cvtsi2sdl 0x28(%rsp),%xmm7
  movsd  %xmm7,0x20(%rsp)
  movsd  D5(%rip),%xmm0
  divsd  %xmm7,%xmm0
  pxor   %xmm7,%xmm7
  cvtsd2ss %xmm0,%xmm7
  movd   %xmm7,%r15d
  movaps %xmm7,%xmm0
  call   <cos@plt>
  movss  %xmm0,0x4(%rbx)
  movd   %r15d,%xmm0
  call   <sin@plt>
  cmpl   $0x0,0x2c(%rsp)
  jne    L27
  xorps  D18(%rip),%xmm0
L27:
  movss  %xmm0,0x4(%rbp)
  mov    0x28(%rsp),%eax
  cmp    $0x2,%eax
  jle    L187
  mov    %eax,%edx
  mov    $0x2,%eax
L17:
  movss  -0x4(%rbx,%rax,4),%xmm0
  movss  0x4(%rbx),%xmm1
  movaps %xmm0,%xmm3
  mulss  %xmm1,%xmm3
  movss  -0x4(%rbp,%rax,4),%xmm5
  movss  0x4(%rbp),%xmm4
  movaps %xmm5,%xmm2
  mulss  %xmm4,%xmm2
  movaps %xmm3,%xmm6
  subss  %xmm2,%xmm6
  movss  %xmm6,(%rbx,%rax,4)
  addss  %xmm5,%xmm0
  addss  %xmm4,%xmm1
  mulss  %xmm1,%xmm0
  subss  %xmm3,%xmm0
  subss  %xmm2,%xmm0
  movss  %xmm0,0x0(%rbp,%rax,4)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L17
  mov    0x28(%rsp),%eax
  lea    -0x1(%rax),%edx
L235:
  mov    $0x0,%eax
L149:
  movss  (%r12,%rax,4),%xmm1
  movss  0x0(%r13,%rax,4),%xmm0
  movaps %xmm1,%xmm2
  addss  0x4(%r12,%rax,4),%xmm2
  movss  %xmm2,(%r12,%rax,4)
  movaps %xmm0,%xmm2
  addss  0x4(%r13,%rax,4),%xmm2
  movss  %xmm2,0x0(%r13,%rax,4)
  subss  0x4(%r12,%rax,4),%xmm1
  movss  %xmm1,0x4(%r12,%rax,4)
  subss  0x4(%r13,%rax,4),%xmm0
  movss  %xmm0,0x4(%r13,%rax,4)
  add    $0x2,%rax
  cmp    %eax,%edx
  jg     L149
L30:
  mov    0x28(%rsp),%edi
  mov    %edi,%eax
  shr    $0x1f,%eax
  add    %edi,%eax
  sar    %eax
  mov    %eax,0x14(%rsp)
  sub    $0x2,%r14d
  mov    %r14d,0x10(%rsp)
  js     L14
  mov    $0x2,%r11d
  lea    0x4(%r12),%rax
  mov    %rax,0x18(%rsp)
  jmp    L51
L187:
  mov    0x28(%rsp),%eax
  lea    -0x1(%rax),%edx
  test   %edx,%edx
  jle    L30
  jmp    L235
L164:
  movss  (%rbx,%rcx,1),%xmm0
  movss  (%rax,%rsi,4),%xmm1
  movaps %xmm0,%xmm4
  mulss  %xmm1,%xmm4
  movss  0x0(%rbp,%rcx,1),%xmm2
  movss  (%rdx,%rsi,4),%xmm5
  movaps %xmm2,%xmm3
  mulss  %xmm5,%xmm3
  addss  %xmm2,%xmm0
  movaps %xmm4,%xmm2
  subss  %xmm3,%xmm2
  addss  %xmm5,%xmm1
  mulss  %xmm1,%xmm0
  subss  %xmm4,%xmm0
  subss  %xmm3,%xmm0
  movss  (%rax),%xmm1
  subss  %xmm2,%xmm1
  movss  %xmm1,(%rax,%rsi,4)
  movss  (%rdx),%xmm1
  subss  %xmm0,%xmm1
  movss  %xmm1,(%rdx,%rsi,4)
  addss  (%rax),%xmm2
  movss  %xmm2,(%rax)
  addss  (%rdx),%xmm0
  movss  %xmm0,(%rdx)
  add    $0x4,%rax
  add    $0x4,%rdx
  add    %r8,%rcx
  cmp    %rdi,%rax
  jne    L164
L58:
  add    %r11d,%r10d
  mov    0x8(%rsp),%rax
  add    %rax,%rdi
  add    %rax,%r9
  cmp    %r14d,%r10d
  jg     L130
L143:
  lea    (%r12,%r9,1),%rax
  lea    0x0(%r13,%r9,1),%rdx
  mov    $0x0,%ecx
  test   %r15d,%r15d
  jg     L164
  jmp    L58
L130:
  subl   $0x1,0x10(%rsp)
  mov    0x10(%rsp),%eax
  cmp    $0xffffffff,%eax
  je     L14
L51:
  mov    0x14(%rsp),%edi
  mov    %edi,%eax
  shr    $0x1f,%eax
  add    %edi,%eax
  sar    %eax
  mov    %eax,0x14(%rsp)
  mov    %r11d,%r15d
  add    %r11d,%r11d
  lea    -0x1(%rax),%r14d
  imul   %r11d,%r14d
  test   %r14d,%r14d
  js     L130
  movslq %r11d,%rdx
  lea    0x0(,%rdx,4),%rdi
  mov    %rdi,0x8(%rsp)
  lea    -0x1(%r15),%edx
  mov    0x18(%rsp),%rdi
  lea    (%rdi,%rdx,4),%rdi
  cltq
  lea    0x0(,%rax,4),%r8
  mov    $0x0,%r9d
  mov    $0x0,%r10d
  movslq %r15d,%rsi
  jmp    L143
L14:
  cmpl   $0x0,0x2c(%rsp)
  je     L202
  mov    0x28(%rsp),%eax
  test   %eax,%eax
  jle    L202
  mov    %eax,%edx
  mov    $0x0,%eax
L160:
  pxor   %xmm0,%xmm0
  cvtss2sd (%r12,%rax,4),%xmm0
  movsd  0x20(%rsp),%xmm7
  divsd  %xmm7,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,(%r12,%rax,4)
  pxor   %xmm0,%xmm0
  cvtss2sd 0x0(%r13,%rax,4),%xmm0
  divsd  %xmm7,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,0x0(%r13,%rax,4)
  add    $0x1,%rax
  cmp    %rax,%rdx
  jne    L160
L202:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: extract_symbolic_data
arguments: tag: D5
data_type: f64
name: extract_symbolic_data
arguments: tag: D18
data_type: byte[16]

tool: D5: 6.283185306

tool: {"D18": [0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]}

assistant: ```c
void kbfft(int l, int n, int k, float *pr, float *pi, float *fr, float *fi) {
  int it, m, is, i, j, nv, l0;
  float p, q, s, vr, vi, poddr, poddi;
  for (it = 0; it <= n - 1; it++) {
    m = it;
    is = 0;
    for (i = 0; i <= k - 1; i++) {
      j = m / 2;
      is = 2 * is + (m - 2 * j);
      m = j;
      fr[it] = pr[is];
      fi[it] = pi[is];
    }
  }
  pr[0] = 1.0;
  pi[0] = 0.0;
  p = 6.283185306 / (1.0 * n);
  pr[1] = cos(p);
  pi[1] = -sin(p);
  if (l != 0)
    pi[1] = -pi[1];
  for (i = 2; i <= n - 1; i++) {
    p = pr[i - 1] * pr[1];
    q = pi[i - 1] * pi[1];
    s = (pr[i - 1] + pi[i - 1]) * (pr[1] + pi[1]);
    pr[i] = p - q;
    pi[i] = s - p - q;
  }
  for (it = 0; it <= n - 2; it = it + 2) {
    vr = fr[it];
    vi = fi[it];
    fr[it] = vr + fr[it + 1];
    fi[it] = vi + fi[it + 1];
    fr[it + 1] = vr - fr[it + 1];
    fi[it + 1] = vi - fi[it + 1];
  }
  m = n / 2;
  nv = 2;
  for (l0 = k - 2; l0 >= 0; l0--) {
    m = m / 2;
    nv = 2 * nv;
    for (it = 0; it <= (m - 1) * nv; it = it + nv)
      for (j = 0; j <= (nv / 2) - 1; j++) {
        p = pr[m * j] * fr[it + j + nv / 2];
        q = pi[m * j] * fi[it + j + nv / 2];
        s = pr[m * j] + pi[m * j];
        s = s * (fr[it + j + nv / 2] + fi[it + j + nv / 2]);
        poddr = p - q;
        poddi = s - p - q;
        fr[it + j + nv / 2] = fr[it + j] - poddr;
        fi[it + j + nv / 2] = fi[it + j] - poddi;
        fr[it + j] = fr[it + j] + poddr;
        fi[it + j] = fi[it + j] + poddi;
      }
  }
  if (l != 0)
    for (i = 0; i <= n - 1; i++) {
      fr[i] = fr[i] / (1.0 * n);
      fi[i] = fi[i] / (1.0 * n);
    }
  return;
}
```