user: 请从给定的汇编指令推导出C源代码：

```asm
<dftcxb>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %edx,-0x24(%rbp)
  mov    %ecx,-0x28(%rbp)
  mov    %r8,-0x30(%rbp)
  mov    %r9,-0x38(%rbp)
  mov    -0x28(%rbp),%eax
  cmp    %eax,-0x24(%rbp)
  jge    L66
  mov    -0x28(%rbp),%eax
  sub    -0x24(%rbp),%eax
  cltq
  shl    $0x2,%eax
  mov    %eax,%edx
  mov    -0x24(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  mov    -0x28(%rbp),%eax
  sub    -0x24(%rbp),%eax
  cltq
  shl    $0x2,%eax
  mov    %eax,%edx
  mov    -0x24(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x20(%rbp),%rax
  add    %rcx,%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
L66:
  mov    -0x28(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  neg    %eax
  mov    %eax,%esi
  mov    -0x28(%rbp),%edx
  mov    -0x30(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    %rcx,%r8
  mov    %esi,%ecx
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <left_rotate@plt>
  mov    -0x28(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  neg    %eax
  mov    %eax,%esi
  mov    -0x28(%rbp),%edx
  mov    -0x38(%rbp),%rcx
  mov    -0x20(%rbp),%rax
  mov    %rcx,%r8
  mov    %esi,%ecx
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <left_rotate@plt>
  movl   $0x0,-0x8(%rbp)
  jmp    L7
L67:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  D3(%rip),%xmm1
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x8(%rbp)
L7:
  mov    -0x28(%rbp),%eax
  cmp    %eax,-0x8(%rbp)
  jl     L67
  lea    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x18(%rbp),%rax
  push   -0x38(%rbp)
  push   -0x30(%rbp)
  mov    $0x1,%r9d
  mov    $0x0,%r8d
  mov    $0x1,%ecx
  mov    %rax,%rdi
  call   <fourt@plt>
  add    $0x10,%rsp
  movl   $0x0,-0x8(%rbp)
  jmp    L69
L65:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  D3(%rip),%xmm1
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x8(%rbp)
L69:
  mov    -0x28(%rbp),%eax
  cmp    %eax,-0x8(%rbp)
  jl     L65
  mov    -0x28(%rbp),%eax
  pxor   %xmm1,%xmm1
  cvtsi2sd %eax,%xmm1
  movsd  D16(%rip),%xmm0
  divsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,-0x4(%rbp)
  movl   $0x0,-0x8(%rbp)
  jmp    L27
L8:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mulss  -0x4(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mulss  -0x4(%rbp),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x8(%rbp)
L27:
  mov    -0x28(%rbp),%eax
  cmp    %eax,-0x8(%rbp)
  jl     L8
  mov    -0x28(%rbp),%eax
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: tag: D3
type_guessed: byte[4]
name: extract_symbolic_data
arguments: tag: D16
type_guessed: f64

tool: {"D3": [0x00,0x00,0x00,0x80]}

tool: D16: 1

assistant: ```c
int dftcxb(float *xrr, float *xri, int isize, int ntot, float *workr, float *worki) {
  int i, idum;
  float scale;
  if (ntot > isize) {
    memset(xrr + isize, 0, sizeof(float) * (ntot - isize));
    memset(xri + isize, 0, sizeof(float) * (ntot - isize));
  }
  left_rotate(xrr, 1, ntot, -ntot / 2, workr);
  left_rotate(xri, 1, ntot, -ntot / 2, worki);
  for (i = 0; i < ntot; i++)
    xri[i] *= -1;
  fourt(xrr, xri, &ntot, 1, 0, 1, workr, worki);
  for (i = 0; i < ntot; i++)
    xri[i] *= -1;
  scale = 1.0 / ntot;
  for (i = 0; i < ntot; i++) {
    xrr[i] *= scale;
    xri[i] *= scale;
  }
  return ntot;
}
```