user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<fft4pt>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x38(%rbp)
  mov    -0x38(%rbp),%rax
  movss  (%rax),%xmm0
  movss  %xmm0,-0x30(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0x4(%rax),%xmm0
  movss  %xmm0,-0x2c(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0x10(%rax),%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0x14(%rax),%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0x8(%rax),%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0xc(%rax),%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0x18(%rax),%xmm0
  movss  %xmm0,-0x18(%rbp)
  mov    -0x38(%rbp),%rax
  movss  0x1c(%rax),%xmm0
  movss  %xmm0,-0x14(%rbp)
  movss  -0x30(%rbp),%xmm0
  addss  -0x28(%rbp),%xmm0
  movss  %xmm0,-0x10(%rbp)
  movss  -0x2c(%rbp),%xmm0
  addss  -0x24(%rbp),%xmm0
  movss  %xmm0,-0xc(%rbp)
  movss  -0x30(%rbp),%xmm0
  subss  -0x28(%rbp),%xmm0
  movss  %xmm0,-0x28(%rbp)
  movss  -0x2c(%rbp),%xmm0
  subss  -0x24(%rbp),%xmm0
  movss  %xmm0,-0x24(%rbp)
  movss  -0x20(%rbp),%xmm0
  subss  -0x18(%rbp),%xmm0
  movss  %xmm0,-0x8(%rbp)
  movss  -0x1c(%rbp),%xmm0
  subss  -0x14(%rbp),%xmm0
  movss  %xmm0,-0x4(%rbp)
  movss  -0x20(%rbp),%xmm0
  addss  -0x18(%rbp),%xmm0
  movss  %xmm0,-0x20(%rbp)
  movss  -0x1c(%rbp),%xmm0
  addss  -0x14(%rbp),%xmm0
  movss  %xmm0,-0x1c(%rbp)
  movss  -0x10(%rbp),%xmm0
  addss  -0x20(%rbp),%xmm0
  movss  %xmm0,-0x30(%rbp)
  movss  -0xc(%rbp),%xmm0
  addss  -0x1c(%rbp),%xmm0
  movss  %xmm0,-0x2c(%rbp)
  movss  -0x10(%rbp),%xmm0
  subss  -0x20(%rbp),%xmm0
  movss  %xmm0,-0x20(%rbp)
  movss  -0xc(%rbp),%xmm0
  subss  -0x1c(%rbp),%xmm0
  movss  %xmm0,-0x1c(%rbp)
  movss  -0x28(%rbp),%xmm0
  subss  -0x4(%rbp),%xmm0
  movss  %xmm0,-0x18(%rbp)
  movss  -0x24(%rbp),%xmm0
  addss  -0x8(%rbp),%xmm0
  movss  %xmm0,-0x14(%rbp)
  movss  -0x28(%rbp),%xmm0
  addss  -0x4(%rbp),%xmm0
  movss  %xmm0,-0x28(%rbp)
  movss  -0x24(%rbp),%xmm0
  subss  -0x8(%rbp),%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x38(%rbp),%rax
  movss  -0x30(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x4,%rax
  movss  -0x2c(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  movss  -0x28(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0xc,%rax
  movss  -0x24(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x10,%rax
  movss  -0x20(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x14,%rax
  movss  -0x1c(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x18,%rax
  movss  -0x18(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x1c,%rax
  movss  -0x14(%rbp),%xmm0
  movss  %xmm0,(%rax)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void fft4pt(float *ioptr) {
  float f0r, f0i, f1r, f1i, f2r, f2i, f3r, f3i;
  float t0r, t0i, t1r, t1i;
  f0r = ioptr[0];
  f0i = ioptr[1];
  f1r = ioptr[4];
  f1i = ioptr[5];
  f2r = ioptr[2];
  f2i = ioptr[3];
  f3r = ioptr[6];
  f3i = ioptr[7];
  t0r = f0r + f1r;
  t0i = f0i + f1i;
  f1r = f0r - f1r;
  f1i = f0i - f1i;
  t1r = f2r - f3r;
  t1i = f2i - f3i;
  f2r = f2r + f3r;
  f2i = f2i + f3i;
  f0r = t0r + f2r;
  f0i = t0i + f2i;
  f2r = t0r - f2r;
  f2i = t0i - f2i;
  f3r = f1r - t1i;
  f3i = f1i + t1r;
  f1r = f1r + t1i;
  f1i = f1i - t1r;
  ioptr[0] = f0r;
  ioptr[1] = f0i;
  ioptr[2] = f1r;
  ioptr[3] = f1i;
  ioptr[4] = f2r;
  ioptr[5] = f2i;
  ioptr[6] = f3r;
  ioptr[7] = f3i;
}
```