user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<bitfill_unaligned_rev>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %edx,-0x24(%rbp)
  mov    %rcx,-0x30(%rbp)
  mov    %r8d,-0x28(%rbp)
  mov    %r9d,-0x34(%rbp)
  cmpl   $0x0,0x10(%rbp)
  je     L48
  mov    -0x24(%rbp),%edx
  mov    -0x18(%rbp),%rax
  mov    $0xffffffffffffffff,%rsi
  mov    %rax,%rdi
  call   <FB_SHIFT_HIGH@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x24(%rbp),%edx
  mov    0x10(%rbp),%eax
  add    %edx,%eax
  mov    0x18(%rbp),%ecx
  mov    $0x0,%edx
  div    %ecx
  mov    %edx,%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    $0xffffffffffffffff,%rsi
  mov    %rax,%rdi
  call   <FB_SHIFT_HIGH@plt>
  not    %rax
  mov    %rax,-0x8(%rbp)
  mov    -0x24(%rbp),%edx
  mov    0x10(%rbp),%eax
  add    %eax,%edx
  mov    0x18(%rbp),%eax
  cmp    %eax,%edx
  ja     L25
  cmpq   $0x0,-0x8(%rbp)
  je     L36
  mov    -0x8(%rbp),%rax
  and    %rax,-0x10(%rbp)
L36:
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rcx
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  xor    -0x30(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <comp@plt>
  mov    -0x20(%rbp),%rdx
  mov    %rax,(%rdx)
  jmp    L45
L25:
  cmpq   $0x0,-0x10(%rbp)
  je     L7
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rcx
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  xor    -0x30(%rbp),%rax
  mov    -0x10(%rbp),%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <comp@plt>
  mov    -0x20(%rbp),%rdx
  mov    %rax,(%rdx)
  addq   $0x8,-0x20(%rbp)
  mov    -0x28(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%ecx
  shl    %cl,%rsi
  mov    -0x34(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %eax,%ecx
  shr    %cl,%rdx
  mov    %rdx,%rax
  or     %rsi,%rax
  mov    %rax,-0x30(%rbp)
  mov    0x18(%rbp),%eax
  sub    -0x24(%rbp),%eax
  sub    %eax,0x10(%rbp)
L7:
  mov    0x18(%rbp),%edi
  mov    0x10(%rbp),%eax
  mov    $0x0,%edx
  div    %edi
  mov    %eax,0x10(%rbp)
  jmp    L103
L62:
  mov    -0x20(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    (%rax),%rdx
  xor    -0x30(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%ecx
  shl    %cl,%rsi
  mov    -0x34(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %eax,%ecx
  shr    %cl,%rdx
  mov    %rdx,%rax
  or     %rsi,%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x20(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    (%rax),%rdx
  xor    -0x30(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%ecx
  shl    %cl,%rsi
  mov    -0x34(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %eax,%ecx
  shr    %cl,%rdx
  mov    %rdx,%rax
  or     %rsi,%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x20(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    (%rax),%rdx
  xor    -0x30(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%ecx
  shl    %cl,%rsi
  mov    -0x34(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %eax,%ecx
  shr    %cl,%rdx
  mov    %rdx,%rax
  or     %rsi,%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x20(%rbp),%rax
  lea    0x8(%rax),%rdx
  mov    %rdx,-0x20(%rbp)
  mov    (%rax),%rdx
  xor    -0x30(%rbp),%rdx
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%ecx
  shl    %cl,%rsi
  mov    -0x34(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %eax,%ecx
  shr    %cl,%rdx
  mov    %rdx,%rax
  or     %rsi,%rax
  mov    %rax,-0x30(%rbp)
  subl   $0x4,0x10(%rbp)
L103:
  cmpl   $0x3,0x10(%rbp)
  ja     L62
  jmp    L99
L101:
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  xor    -0x30(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,(%rax)
  mov    -0x28(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rsi
  mov    %eax,%ecx
  shl    %cl,%rsi
  mov    -0x34(%rbp),%eax
  mov    -0x30(%rbp),%rdx
  mov    %eax,%ecx
  shr    %cl,%rdx
  mov    %rdx,%rax
  or     %rsi,%rax
  mov    %rax,-0x30(%rbp)
L99:
  mov    0x10(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,0x10(%rbp)
  test   %eax,%eax
  jne    L101
  cmpq   $0x0,-0x8(%rbp)
  je     L45
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rcx
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  xor    -0x30(%rbp),%rax
  mov    -0x8(%rbp),%rdx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <comp@plt>
  mov    -0x20(%rbp),%rdx
  mov    %rax,(%rdx)
  jmp    L45
L48:
  nop
L45:
  leave
  ret
```

assistant: ```c
void bitfill_unaligned_rev(struct fb_info *p, unsigned long *dst, int dst_idx, unsigned long pat, int left, int right, unsigned n, int bits) {
  unsigned long first, last;
  if (!n)
    return;
  first = FB_SHIFT_HIGH(p, ~0UL, dst_idx);
  last = ~(FB_SHIFT_HIGH(p, ~0UL, (dst_idx + n) % bits));
  if (dst_idx + n <= bits) {
    if (last)
      first &= last;
    *dst = comp(*dst ^ pat, *dst, first);
  } else {
    if (first != 0UL) {
      *dst = comp(*dst ^ pat, *dst, first);
      dst++;
      pat = pat << left | pat >> right;
      n -= bits - dst_idx;
    }
    n /= bits;
    while (n >= 4) {
      *dst++ ^= pat;
      pat = pat << left | pat >> right;
      *dst++ ^= pat;
      pat = pat << left | pat >> right;
      *dst++ ^= pat;
      pat = pat << left | pat >> right;
      *dst++ ^= pat;
      pat = pat << left | pat >> right;
      n -= 4;
    }
    while (n--) {
      *dst ^= pat;
      pat = pat << left | pat >> right;
    }
    if (last)
      *dst = comp(*dst ^ pat, *dst, last);
  }
}
```