user: What is the c source code of the assembly code below:

```asm
<bink_idct_col>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%edx
  mov    -0x50(%rbp),%rax
  add    $0x40,%rax
  mov    (%rax),%eax
  or     %eax,%edx
  mov    -0x50(%rbp),%rax
  add    $0x60,%rax
  mov    (%rax),%eax
  or     %eax,%edx
  mov    -0x50(%rbp),%rax
  sub    $0xffffffffffffff80,%rax
  mov    (%rax),%eax
  or     %eax,%edx
  mov    -0x50(%rbp),%rax
  add    $0xa0,%rax
  mov    (%rax),%eax
  or     %eax,%edx
  mov    -0x50(%rbp),%rax
  add    $0xc0,%rax
  mov    (%rax),%eax
  or     %eax,%edx
  mov    -0x50(%rbp),%rax
  add    $0xe0,%rax
  mov    (%rax),%eax
  or     %edx,%eax
  test   %eax,%eax
  jne    L14
  mov    -0x48(%rbp),%rax
  add    $0xe0,%rax
  mov    -0x50(%rbp),%rdx
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  mov    -0x48(%rbp),%rdx
  add    $0xc0,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x48(%rbp),%rax
  add    $0xa0,%rax
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  mov    -0x48(%rbp),%rdx
  sub    $0xffffffffffffff80,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x48(%rbp),%rax
  add    $0x60,%rax
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  mov    -0x48(%rbp),%rdx
  add    $0x40,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x48(%rbp),%rax
  add    $0x20,%rax
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  mov    (%rax),%edx
  mov    -0x48(%rbp),%rax
  mov    %edx,(%rax)
  jmp    L17
L14:
  mov    -0x50(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x50(%rbp),%rax
  sub    $0xffffffffffffff80,%rax
  mov    (%rax),%eax
  add    %edx,%eax
  mov    %eax,-0x34(%rbp)
  mov    -0x50(%rbp),%rax
  mov    (%rax),%eax
  mov    -0x50(%rbp),%rdx
  sub    $0xffffffffffffff80,%rdx
  mov    (%rdx),%edx
  sub    %edx,%eax
  mov    %eax,-0x30(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x40,%rax
  mov    (%rax),%edx
  mov    -0x50(%rbp),%rax
  add    $0xc0,%rax
  mov    (%rax),%eax
  add    %edx,%eax
  mov    %eax,-0x2c(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x40,%rax
  mov    (%rax),%eax
  mov    -0x50(%rbp),%rdx
  add    $0xc0,%rdx
  mov    (%rdx),%edx
  sub    %edx,%eax
  imul   $0xb50,%eax,%eax
  sar    $0xb,%eax
  mov    %eax,-0x28(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0xa0,%rax
  mov    (%rax),%edx
  mov    -0x50(%rbp),%rax
  add    $0x60,%rax
  mov    (%rax),%eax
  add    %edx,%eax
  mov    %eax,-0x24(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0xa0,%rax
  mov    (%rax),%eax
  mov    -0x50(%rbp),%rdx
  add    $0x60,%rdx
  mov    (%rdx),%edx
  sub    %edx,%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%edx
  mov    -0x50(%rbp),%rax
  add    $0xe0,%rax
  mov    (%rax),%eax
  add    %edx,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%eax
  mov    -0x50(%rbp),%rdx
  add    $0xe0,%rdx
  mov    (%rdx),%edx
  sub    %edx,%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x24(%rbp),%edx
  mov    -0x1c(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x20(%rbp),%edx
  mov    -0x18(%rbp),%eax
  add    %edx,%eax
  imul   $0xec8,%eax,%eax
  sar    $0xb,%eax
  mov    %eax,-0x10(%rbp)
  mov    -0x20(%rbp),%eax
  imul   $0xffffeb18,%eax,%eax
  sar    $0xb,%eax
  sub    -0x14(%rbp),%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0xc(%rbp)
  mov    -0x1c(%rbp),%eax
  sub    -0x24(%rbp),%eax
  imul   $0xb50,%eax,%eax
  sar    $0xb,%eax
  sub    -0xc(%rbp),%eax
  mov    %eax,-0x8(%rbp)
  mov    -0x18(%rbp),%eax
  imul   $0x8a9,%eax,%eax
  sar    $0xb,%eax
  mov    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    %edx,%eax
  sub    -0x10(%rbp),%eax
  mov    %eax,-0x4(%rbp)
  mov    -0x34(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %eax,%edx
  mov    -0x14(%rbp),%eax
  add    %eax,%edx
  mov    -0x48(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x30(%rbp),%edx
  mov    -0x28(%rbp),%eax
  add    %edx,%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x48(%rbp),%rax
  add    $0x20,%rax
  mov    -0xc(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x30(%rbp),%eax
  sub    -0x28(%rbp),%eax
  mov    %eax,%edx
  mov    -0x2c(%rbp),%eax
  lea    (%rdx,%rax,1),%ecx
  mov    -0x48(%rbp),%rax
  add    $0x40,%rax
  mov    -0x8(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x34(%rbp),%eax
  sub    -0x2c(%rbp),%eax
  mov    -0x48(%rbp),%rdx
  add    $0x60,%rdx
  sub    -0x4(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x34(%rbp),%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x48(%rbp),%rax
  sub    $0xffffffffffffff80,%rax
  mov    -0x4(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x30(%rbp),%eax
  sub    -0x28(%rbp),%eax
  mov    %eax,%edx
  mov    -0x2c(%rbp),%eax
  add    %edx,%eax
  mov    -0x48(%rbp),%rdx
  add    $0xa0,%rdx
  sub    -0x8(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x30(%rbp),%edx
  mov    -0x28(%rbp),%eax
  add    %edx,%eax
  sub    -0x2c(%rbp),%eax
  mov    -0x48(%rbp),%rdx
  add    $0xc0,%rdx
  sub    -0xc(%rbp),%eax
  mov    %eax,(%rdx)
  mov    -0x34(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  add    %edx,%eax
  mov    -0x48(%rbp),%rdx
  add    $0xe0,%rdx
  sub    -0x14(%rbp),%eax
  mov    %eax,(%rdx)
L17:
  nop
  pop    %rbp
  ret
```

assistant: ```c
void bink_idct_col(int *dest, const int32_t *src) {
  if ((src[8] | src[16] | src[24] | src[32] | src[40] | src[48] | src[56]) == 0) {
    dest[0] = dest[8] = dest[16] = dest[24] = dest[32] = dest[40] = dest[48] = dest[56] = src[0];
  } else {
    {
      const int a0 = (src)[0] + (src)[32];
      const int a1 = (src)[0] - (src)[32];
      const int a2 = (src)[16] + (src)[48];
      const int a3 = (2896 * ((src)[16] - (src)[48])) >> 11;
      const int a4 = (src)[40] + (src)[24];
      const int a5 = (src)[40] - (src)[24];
      const int a6 = (src)[8] + (src)[56];
      const int a7 = (src)[8] - (src)[56];
      const int b0 = a4 + a6;
      const int b1 = (3784 * (a5 + a7)) >> 11;
      const int b2 = ((-5352 * a5) >> 11) - b0 + b1;
      const int b3 = (2896 * (a6 - a4) >> 11) - b2;
      const int b4 = ((2217 * a7) >> 11) + b3 - b1;
      (dest)[0] = (a0 + a2 + b0);
      (dest)[8] = (a1 + a3 - a2 + b2);
      (dest)[16] = (a1 - a3 + a2 + b3);
      (dest)[24] = (a0 - a2 - b4);
      (dest)[32] = (a0 - a2 + b4);
      (dest)[40] = (a1 - a3 + a2 - b3);
      (dest)[48] = (a1 + a3 - a2 - b2);
      (dest)[56] = (a0 + a2 - b0);
    };
  }
}
```