user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<inverse_dit_butterfly>:
  endbr64
  push   %r15
  mov    %rsi,%rax
  push   %r14
  shl    $0x4,%rax
  push   %r13
  add    %rdi,%rax
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rsi,%rbx
  sar    %rbx
  mov    %rdi,-0x10(%rsp)
  mov    %rbx,-0x20(%rsp)
  mov    %rax,-0x30(%rsp)
  test   %rbx,%rbx
  jle    L4
  movq   $0x2,-0x18(%rsp)
  mov    %rdx,%r14
  mov    %rcx,%rbp
  nopl   (%rax)
L42:
  mov    -0x18(%rsp),%rax
  mov    -0x10(%rsp),%rdx
  shl    $0x3,%rax
  mov    %rdx,%r12
  mov    %rax,-0x28(%rsp)
  add    %rax,%r12
  cmp    %r12,-0x30(%rsp)
  jbe    L93
  mov    -0x20(%rsp),%rax
  lea    0x0(,%rax,8),%rsi
  shl    $0x4,%rax
  mov    %rax,%r15
L70:
  cmp    %r12,%rdx
  jae    L22
  lea    -0x1(%r12),%rdi
  xor    %r8d,%r8d
  mov    %r12,%rcx
  mov    %rdx,%rax
  sub    %rdx,%rdi
  mov    %rdi,%rbx
  shr    $0x4,%rbx
  mov    %rbx,%r9
  mov    %rbx,%r11
  imul   %rsi,%r9
  test   %rsi,%rsi
  cmovns %r9,%r8
  shl    $0x4,%r11
  lea    0x8(%r11),%r13
  mov    %r11,-0x48(%rsp)
  xor    %r11d,%r11d
  test   %rsi,%rsi
  cmovns %r11,%r9
  lea    (%r14,%r8,1),%r10
  add    %rbp,%r8
  mov    %r10,-0x50(%rsp)
  lea    (%rdx,%r13,1),%r10
  add    %r12,%r13
  lea    (%r14,%r9,1),%r11
  add    %rbp,%r9
  mov    %r9,-0x40(%rsp)
  lea    0x1f(%rdx),%r9
  sub    %r12,%r9
  cmp    $0x3e,%r9
  seta   %r9b
  cmp    $0xf,%rdi
  seta   %dil
  and    %edi,%r9d
  cmp    %r10,%r11
  seta   %dil
  cmp    -0x50(%rsp),%rdx
  seta   -0x31(%rsp)
  or     -0x31(%rsp),%dil
  and    %r9d,%edi
  cmp    -0x50(%rsp),%r12
  seta   %r9b
  cmp    %r13,%r11
  seta   %r11b
  or     %r11d,%r9d
  mov    -0x40(%rsp),%r11
  and    %edi,%r9d
  cmp    %r8,%rdx
  seta   %dil
  cmp    %r11,%r10
  setb   %r10b
  or     %r10d,%edi
  test   %dil,%r9b
  je     L5
  cmp    %r8,%r12
  seta   %dil
  cmp    %r11,%r13
  setb   %r8b
  or     %dil,%r8b
  je     L5
  lea    0x1(%rbx),%r10
  mov    %r14,%r8
  mov    %rbp,%rdi
  mov    %r10,%r9
  shr    %r9
  shl    $0x5,%r9
  add    %rdx,%r9
  xchg   %ax,%ax
L101:
  movsd  (%rdi),%xmm0
  movupd (%rcx),%xmm6
  add    $0x20,%rax
  add    $0x20,%rcx
  movsd  (%r8),%xmm2
  movupd -0x10(%rcx),%xmm4
  movhpd (%rdi,%rsi,1),%xmm0
  movlpd -0x18(%rcx),%xmm4
  movhpd -0x10(%rcx),%xmm6
  add    %r15,%rdi
  movhpd (%r8,%rsi,1),%xmm2
  movapd %xmm0,%xmm7
  movupd -0x20(%rax),%xmm1
  add    %r15,%r8
  mulpd  %xmm4,%xmm7
  movapd %xmm2,%xmm5
  movupd -0x10(%rax),%xmm3
  movlpd -0x18(%rax),%xmm3
  mulpd  %xmm6,%xmm5
  movhpd -0x10(%rax),%xmm1
  mulpd  %xmm4,%xmm2
  movapd %xmm3,%xmm4
  mulpd  %xmm6,%xmm0
  subpd  %xmm7,%xmm5
  addpd  %xmm2,%xmm0
  movapd %xmm1,%xmm2
  addpd  %xmm5,%xmm2
  subpd  %xmm5,%xmm1
  addpd  %xmm0,%xmm4
  subpd  %xmm0,%xmm3
  movapd %xmm2,%xmm6
  movapd %xmm1,%xmm0
  unpcklpd %xmm4,%xmm6
  unpckhpd %xmm4,%xmm2
  unpcklpd %xmm3,%xmm0
  unpckhpd %xmm3,%xmm1
  movups %xmm6,-0x20(%rax)
  movups %xmm2,-0x10(%rax)
  movups %xmm0,-0x20(%rcx)
  movups %xmm1,-0x10(%rcx)
  cmp    %rax,%r9
  jne    L101
  mov    %r10,%rdi
  mov    -0x20(%rsp),%rcx
  and    $0xfffffffffffffffe,%rdi
  mov    %rdi,%rax
  imul   %rdi,%rcx
  shl    $0x4,%rax
  add    %rax,%rdx
  add    %r12,%rax
  cmp    %rdi,%r10
  je     L41
  movsd  (%r14,%rcx,8),%xmm4
  movsd  0x0(%rbp,%rcx,8),%xmm3
  movupd (%rax),%xmm2
  movupd (%rdx),%xmm1
  movapd %xmm4,%xmm0
  unpcklpd %xmm3,%xmm0
  unpcklpd %xmm2,%xmm2
  unpcklpd %xmm4,%xmm3
  mulpd  %xmm0,%xmm2
  movupd (%rax),%xmm0
  unpckhpd %xmm0,%xmm0
  mulpd  %xmm3,%xmm0
  movapd %xmm2,%xmm3
  subpd  %xmm0,%xmm3
  addpd  %xmm2,%xmm0
  movsd  %xmm3,%xmm0
  movapd %xmm0,%xmm2
  addpd  %xmm1,%xmm2
  subpd  %xmm0,%xmm1
  movups %xmm2,(%rdx)
  movups %xmm1,(%rax)
L41:
  mov    -0x48(%rsp),%rax
  lea    0x10(%r12,%rax,1),%rdx
L53:
  mov    -0x28(%rsp),%rax
  lea    (%rdx,%rax,1),%r12
  cmp    %r12,-0x30(%rsp)
  ja     L70
L93:
  shlq   -0x18(%rsp)
  sarq   -0x20(%rsp)
  jne    L42
L4:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L5:
  mov    -0x20(%rsp),%rdi
  mov    %r12,%rcx
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L16:
  movupd (%rcx),%xmm0
  movupd (%rdx),%xmm2
  add    $0x10,%rdx
  add    $0x10,%rcx
  movsd  (%r14,%rax,8),%xmm4
  movsd  0x0(%rbp,%rax,8),%xmm3
  add    %rdi,%rax
  unpcklpd %xmm0,%xmm0
  movapd %xmm4,%xmm1
  unpcklpd %xmm3,%xmm1
  unpcklpd %xmm4,%xmm3
  mulpd  %xmm1,%xmm0
  movupd -0x10(%rcx),%xmm1
  unpckhpd %xmm1,%xmm1
  mulpd  %xmm3,%xmm1
  movapd %xmm0,%xmm3
  subpd  %xmm1,%xmm3
  addpd  %xmm1,%xmm0
  movapd %xmm2,%xmm1
  movsd  %xmm3,%xmm0
  addpd  %xmm0,%xmm1
  subpd  %xmm0,%xmm2
  movups %xmm1,-0x10(%rdx)
  movups %xmm2,-0x10(%rcx)
  cmp    %rdx,%r12
  ja     L16
  jmp    L41
  cs nopw 0x0(%rax,%rax,1)
L22:
  mov    %r12,%rdx
  jmp    L53
```

assistant: ```c
void inverse_dit_butterfly(double *data, long size, double *cos_ang, double *sin_ang) {
  long angle, astep, dl;
  double xr, yr, xi, yi, wr, wi, dr, di;
  double *l1, *l2, *end, *ol2;
  astep = size >> 1;
  end = data + size + size;
  for (dl = 2; astep > 0; dl += dl, astep >>= 1) {
    l1 = data;
    l2 = data + dl;
    for (; l2 < end; l1 = l2, l2 = l2 + dl) {
      ol2 = l2;
      for (angle = 0; l1 < ol2; l1 += 2, l2 += 2) {
        wr = cos_ang[angle];
        wi = sin_ang[angle];
        xr = *l1;
        xi = *(l1 + 1);
        yr = *l2;
        yi = *(l2 + 1);
        dr = yr * wr - yi * wi;
        di = yr * wi + yi * wr;
        *(l1) = xr + dr;
        *(l1 + 1) = xi + di;
        *(l2) = xr - dr;
        *(l2 + 1) = xi - di;
        angle += astep;
      }
    }
  }
}
```