user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<ifft>:
  endbr64
  push   %r15
  xor    %eax,%eax
  push   %r14
  push   %r13
  push   %r12
  mov    %edi,%r12d
  push   %rbp
  mov    %rdx,%rbp
  push   %rbx
  mov    %rsi,%rbx
  mov    %edi,%esi
  mov    %rbx,%rdi
  sub    $0x28,%rsp
  call   <fht@plt>
  mov    %r12d,%esi
  mov    %rbp,%rdi
  xor    %eax,%eax
  call   <fht@plt>
  mov    %r12d,%esi
  lea    -0x1(%r12),%eax
  shr    $0x1f,%esi
  mov    %eax,0x14(%rsp)
  add    %r12d,%esi
  sar    %esi
  cmp    $0x3,%r12d
  jle    L21
  lea    -0x1(%rsi),%edi
  movslq %r12d,%rdx
  lea    0x18(%rbx),%r8
  shl    $0x3,%rdx
  lea    0x8(,%rdi,8),%r10
  mov    %rdi,%r11
  neg    %rdi
  lea    (%rdx,%rdi,8),%r9
  lea    -0x10(%rdx),%rax
  mov    %r8,0x18(%rsp)
  lea    (%rbx,%rdx,1),%r13
  lea    0x0(%rbp,%rdx,1),%r14
  lea    0x0(%rbp,%rax,1),%rcx
  lea    0x8(%rbp),%rdx
  add    %rbx,%rax
  cmp    %r9,%r10
  mov    %rax,0x8(%rsp)
  setle  %r15b
  lea    0x8(%rbx),%rax
  cmp    %r8,%rdx
  lea    0x18(%rbp),%rdi
  setae  %r8b
  cmp    %rdi,%rax
  setae  %dil
  or     %r8d,%edi
  cmp    $0x5,%r12d
  setg   %r8b
  and    %r8d,%edi
  cmp    %r14,0x8(%rsp)
  setae  %r8b
  cmp    %r13,%rcx
  mov    %edi,%r12d
  setae  %dil
  or     %r8d,%edi
  and    %r12d,%edi
  cmp    %r13,%rax
  lea    0x0(%rbp,%r10,1),%r12
  setae  %r8b
  or     %r15d,%r8d
  and    %r8d,%edi
  lea    (%rbx,%r9,1),%r8
  cmp    %r8,%r12
  setbe  %r8b
  cmp    %rdx,%r13
  setbe  %r12b
  add    %rbp,%r9
  add    %rbx,%r10
  or     %r12d,%r8d
  and    %edi,%r8d
  cmp    %r9,%r10
  setbe  %dil
  cmp    %r14,%rax
  setae  %r9b
  or     %r9d,%edi
  test   %dil,%r8b
  je     L25
  cmp    %rdx,%r14
  setbe  %dil
  or     %r15b,%dil
  je     L25
  mov    %r11d,%edi
  mov    0x8(%rsp),%rsi
  movapd D20(%rip),%xmm5
  shr    %edi
  sub    $0x1,%edi
  shl    $0x4,%rdi
  add    0x18(%rsp),%rdi
  nopl   0x0(%rax)
L56:
  movupd (%rsi),%xmm1
  movupd (%rax),%xmm0
  add    $0x10,%rax
  sub    $0x10,%rsi
  movupd (%rcx),%xmm4
  movupd (%rdx),%xmm2
  sub    $0x10,%rcx
  add    $0x10,%rdx
  movupd -0x10(%rax),%xmm3
  shufpd $0x1,%xmm1,%xmm1
  addpd  %xmm1,%xmm0
  shufpd $0x1,%xmm4,%xmm4
  subpd  %xmm4,%xmm2
  subpd  %xmm1,%xmm3
  movupd -0x10(%rdx),%xmm1
  addpd  %xmm4,%xmm1
  movapd %xmm3,%xmm4
  addpd  %xmm1,%xmm4
  subpd  %xmm3,%xmm1
  mulpd  %xmm5,%xmm4
  mulpd  %xmm5,%xmm1
  movups %xmm4,-0x10(%rdx)
  shufpd $0x1,%xmm1,%xmm1
  movups %xmm1,0x10(%rcx)
  movapd %xmm0,%xmm1
  addpd  %xmm2,%xmm0
  subpd  %xmm2,%xmm1
  mulpd  %xmm5,%xmm0
  mulpd  %xmm5,%xmm1
  shufpd $0x1,%xmm0,%xmm0
  movups %xmm1,-0x10(%rax)
  movups %xmm0,0x10(%rsi)
  cmp    %rdi,%rax
  jne    L56
  mov    0x14(%rsp),%eax
  mov    %r11d,%ecx
  mov    %r11d,%edx
  and    $0xfffffffe,%ecx
  or     $0x1,%edx
  sub    %ecx,%eax
  cmp    %ecx,%r11d
  je     L21
  movslq %edx,%rdx
  cltq
  shl    $0x3,%rdx
  shl    $0x3,%rax
  lea    (%rbx,%rdx,1),%rcx
  add    %rax,%rbx
  add    %rbp,%rdx
  add    %rbp,%rax
  movsd  (%rcx),%xmm3
  movsd  (%rbx),%xmm1
  movsd  (%rdx),%xmm2
  movsd  (%rax),%xmm4
  movapd %xmm3,%xmm0
  subsd  %xmm1,%xmm3
  addsd  %xmm1,%xmm0
  movapd %xmm2,%xmm1
  subsd  %xmm4,%xmm2
  addsd  %xmm4,%xmm1
  movsd  D20(%rip),%xmm4
  movapd %xmm3,%xmm5
  addsd  %xmm1,%xmm5
  subsd  %xmm3,%xmm1
  mulsd  %xmm4,%xmm5
  mulsd  %xmm4,%xmm1
  movsd  %xmm5,(%rdx)
  movsd  %xmm1,(%rax)
  movapd %xmm0,%xmm1
  addsd  %xmm2,%xmm0
  subsd  %xmm2,%xmm1
  mulsd  %xmm4,%xmm0
  mulsd  %xmm4,%xmm1
  movsd  %xmm1,(%rcx)
  movsd  %xmm0,(%rbx)
L21:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L25:
  movslq 0x14(%rsp),%rax
  movsd  D20(%rip),%xmm4
  mov    $0x1,%edx
  shl    $0x3,%rax
  xchg   %ax,%ax
L48:
  movsd  (%rbx,%rdx,8),%xmm3
  movsd  (%rbx,%rax,1),%xmm1
  movsd  0x0(%rbp,%rdx,8),%xmm2
  movsd  0x0(%rbp,%rax,1),%xmm5
  movapd %xmm3,%xmm0
  subsd  %xmm1,%xmm3
  addsd  %xmm1,%xmm0
  movapd %xmm2,%xmm1
  subsd  %xmm5,%xmm2
  addsd  %xmm5,%xmm1
  movapd %xmm3,%xmm5
  addsd  %xmm1,%xmm5
  subsd  %xmm3,%xmm1
  mulsd  %xmm4,%xmm5
  mulsd  %xmm4,%xmm1
  movsd  %xmm5,0x0(%rbp,%rdx,8)
  movsd  %xmm1,0x0(%rbp,%rax,1)
  movapd %xmm0,%xmm1
  addsd  %xmm2,%xmm0
  subsd  %xmm2,%xmm1
  mulsd  %xmm4,%xmm0
  mulsd  %xmm4,%xmm1
  movsd  %xmm1,(%rbx,%rdx,8)
  add    $0x1,%rdx
  movsd  %xmm0,(%rbx,%rax,1)
  sub    $0x8,%rax
  cmp    %edx,%esi
  jg     L48
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: parse_data
arguments: label: D20
data_type: f64[2]

tool: {"D20": [0.5,0.5]}

assistant: ```c
void ifft(n, real, imag) int n;
double *real, *imag;
{
  double a, b, c, d;
  double q, r, s, t;
  int i, j, k;
  fht(real, n);
  fht(imag, n);
  for (i = 1, j = n - 1, k = n / 2; i < k; i++, j--) {
    a = real[i];
    b = real[j];
    q = a + b;
    r = a - b;
    c = imag[i];
    d = imag[j];
    s = c + d;
    t = c - d;
    imag[i] = (s + r) * 0.5;
    imag[j] = (s - r) * 0.5;
    real[i] = (q - t) * 0.5;
    real[j] = (q + t) * 0.5;
  }
}
```