user: 请从给定的汇编指令推导出C源代码：

```asm
<rgb_filter>:
  endbr64
  push   %r13
  mov    %edi,%eax
  mov    %rsi,%r10
  push   %r12
  push   %rbp
  lea    0x3(%rcx),%rbp
  push   %rbx
  movzbl (%rcx),%edi
  lea    0x3(%r8),%rbx
  mov    0x28(%rsp),%rsi
  mov    0x30(%rsp),%rdx
  mov    %dil,(%r8)
  movzbl 0x1(%rcx),%edi
  mov    %dil,0x1(%r8)
  movzbl 0x2(%rcx),%ecx
  mov    %cl,0x2(%r8)
  cmp    $0x2,%eax
  jle    L47
  lea    -0x3(%rax),%r12d
  mov    %rbx,%rcx
  mov    %rbp,%rdi
  mov    $0xffffffff,%r11d
  lea    0x6(%r12,%r12,2),%rax
  add    %rax,%r8
  nopl   0x0(%rax,%rax,1)
L42:
  movzbl (%rdi),%eax
  xor    %r13d,%r13d
  movslq (%r10,%rax,4),%rax
  sub    -0x18(%r9),%rax
  sub    (%r9),%rax
  sub    0x18(%r9),%rax
  sub    -0x18(%rsi),%rax
  sub    0x18(%rsi),%rax
  sub    -0x18(%rdx),%rax
  sub    (%rdx),%rax
  sub    0x18(%rdx),%rax
  add    $0x4,%rax
  sar    $0x3,%rax
  js     L15
  cmp    $0xfe,%rax
  mov    %eax,%r13d
  cmovg  %r11d,%r13d
L15:
  mov    %r13b,(%rcx)
  movzbl 0x1(%rdi),%eax
  xor    %r13d,%r13d
  movslq (%r10,%rax,4),%rax
  sub    -0x10(%r9),%rax
  sub    0x8(%r9),%rax
  sub    0x20(%r9),%rax
  sub    -0x10(%rsi),%rax
  sub    0x20(%rsi),%rax
  sub    -0x10(%rdx),%rax
  sub    0x8(%rdx),%rax
  sub    0x20(%rdx),%rax
  add    $0x4,%rax
  sar    $0x3,%rax
  js     L18
  cmp    $0xfe,%rax
  mov    %eax,%r13d
  cmovg  %r11d,%r13d
L18:
  add    $0x3,%rdi
  mov    %r13b,0x1(%rcx)
  add    $0x3,%rcx
  xor    %r13d,%r13d
  movzbl -0x1(%rdi),%eax
  movslq (%r10,%rax,4),%rax
  sub    -0x8(%r9),%rax
  sub    0x10(%r9),%rax
  sub    0x28(%r9),%rax
  sub    -0x8(%rsi),%rax
  sub    0x28(%rsi),%rax
  sub    -0x8(%rdx),%rax
  sub    0x10(%rdx),%rax
  sub    0x28(%rdx),%rax
  add    $0x4,%rax
  sar    $0x3,%rax
  js     L28
  cmp    $0xfe,%rax
  mov    %eax,%r13d
  cmovg  %r11d,%r13d
L28:
  mov    %r13b,-0x1(%rcx)
  add    $0x18,%r9
  add    $0x18,%rsi
  add    $0x18,%rdx
  cmp    %r8,%rcx
  jne    L42
  lea    0x3(%r12,%r12,2),%rax
  add    %rax,%rbp
  add    %rax,%rbx
L47:
  movzbl 0x0(%rbp),%eax
  mov    %al,(%rbx)
  movzbl 0x1(%rbp),%eax
  mov    %al,0x1(%rbx)
  movzbl 0x2(%rbp),%eax
  mov    %al,0x2(%rbx)
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

assistant: ```c
void rgb_filter(int width, int *pos_lut, int *neg_lut, unsigned char *src, unsigned char *dst, long int *neg0, long int *neg1, long int *neg2) {
  long int pixel;
  *dst++ = *src++;
  *dst++ = *src++;
  *dst++ = *src++;
  width -= 2;
  while (width > 0) {
    pixel = (pos_lut[*src++] - neg0[-3] - neg0[0] - neg0[3] - neg1[-3] - neg1[3] - neg2[-3] - neg2[0] - neg2[3]);
    pixel = (pixel + 4) >> 3;
    if (pixel < 0)
      *dst++ = 0;
    else if (pixel < 255)
      *dst++ = pixel;
    else
      *dst++ = 255;
    pixel = (pos_lut[*src++] - neg0[-2] - neg0[1] - neg0[4] - neg1[-2] - neg1[4] - neg2[-2] - neg2[1] - neg2[4]);
    pixel = (pixel + 4) >> 3;
    if (pixel < 0)
      *dst++ = 0;
    else if (pixel < 255)
      *dst++ = pixel;
    else
      *dst++ = 255;
    pixel = (pos_lut[*src++] - neg0[-1] - neg0[2] - neg0[5] - neg1[-1] - neg1[5] - neg2[-1] - neg2[2] - neg2[5]);
    pixel = (pixel + 4) >> 3;
    if (pixel < 0)
      *dst++ = 0;
    else if (pixel < 255)
      *dst++ = pixel;
    else
      *dst++ = 255;
    neg0 += 3;
    neg1 += 3;
    neg2 += 3;
    width--;
  };
  *dst++ = *src++;
  *dst++ = *src++;
  *dst++ = *src++;
}
```