user: 下面的汇编指令对应的C源代码是什么：

```asm
<jachness_device>:
  endbr64
  mov    %rdi,%rcx
  mov    %rsi,%rax
  mov    %edx,%esi
  lea    0x3e(%rdx),%edi
  add    $0x1f,%edx
  cmovns %edx,%edi
  sar    $0x5,%edi
  mov    %esi,%r8d
  sar    $0x1f,%r8d
  shr    $0x1d,%r8d
  lea    (%rsi,%r8,1),%edx
  and    $0x7,%edx
  sub    %r8d,%edx
  cmp    $0x1f,%edx
  ja     L108
  mov    %edx,%edx
  lea    D4(%rip),%r8
  movslq (%r8,%rdx,4),%rdx
  add    %r8,%rdx
  notrack jmp *%rdx
L102:
  movzbl (%rcx),%edx
  mov    %dl,(%rax)
  lea    0x1(%rax),%rax
  lea    0x1(%rcx),%rcx
  movzbl (%rcx),%edx
  mov    %dl,(%rax)
  lea    0x1(%rax),%rax
  lea    0x1(%rcx),%rcx
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L163:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L95:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L63:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L138:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L60:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L1:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L128:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L41:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L7:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L34:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L81:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L19:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L27:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L47:
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  movzbl (%r8),%r8d
  mov    %r8b,(%rdx)
  lea    0x1(%rcx),%r8
  lea    0x1(%rax),%rdx
  movzbl (%rcx),%ecx
  mov    %cl,(%rax)
L153:
  movzbl (%r8),%eax
  mov    %al,(%rdx)
  sub    $0x1,%edi
  lea    0x1(%r8),%rcx
  lea    0x1(%rdx),%rax
  test   %edi,%edi
  jg     L102
L108:
  mov    %esi,%eax
  ret
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L163
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L95
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L63
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L138
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L60
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L1
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L128
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L41
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L7
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L34
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L81
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L19
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L27
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L47
  mov    %rax,%rdx
  mov    %rcx,%r8
  jmp    L153
```

assistant: ```c
int jachness_device(char *from, char *to, int count) {
  {
    int n = (count + 31) / 32;
    switch (count % 8) {
    case 0:
      goto again32;
      {
      again32:
        *to++ = *from++;
      case 31:
        *to++ = *from++;
      case 30:
        *to++ = *from++;
      case 29:
        *to++ = *from++;
      case 28:
        *to++ = *from++;
      case 27:
        *to++ = *from++;
      case 26:
        *to++ = *from++;
      case 25:
        *to++ = *from++;
      case 24:
      again24:
        *to++ = *from++;
      case 23:
        *to++ = *from++;
      case 22:
        *to++ = *from++;
      case 21:
        *to++ = *from++;
      case 20:
        *to++ = *from++;
      case 19:
        *to++ = *from++;
      case 18:
        *to++ = *from++;
      case 17:
        *to++ = *from++;
      case 16:
      again16:
        *to++ = *from++;
      case 15:
        *to++ = *from++;
      case 14:
        *to++ = *from++;
      case 13:
        *to++ = *from++;
      case 12:
        *to++ = *from++;
      case 11:
        *to++ = *from++;
      case 10:
        *to++ = *from++;
      case 9:
        *to++ = *from++;
      case 8:
      again8:
        *to++ = *from++;
      case 7:
        *to++ = *from++;
      case 6:
        *to++ = *from++;
      case 5:
        *to++ = *from++;
      case 4:
        *to++ = *from++;
      case 3:
        *to++ = *from++;
      case 2:
        *to++ = *from++;
      case 1:
        *to++ = *from++;
      };
      if (--n > 0)
        goto again32;
    }
  }
  return count;
}
```