user: 这段汇编代码用C语言表示是什么样的？

```asm
<MTX_AHUFF_BitsUsed>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbx
  mov    %rbx,%rax
  not    %rax
  shr    $0x3f,%rax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    %rbx,%rax
  and    $0xffff0000,%eax
  test   %rax,%rax
  je     L477
  mov    %rbx,%rax
  and    $0xff000000,%eax
  test   %rax,%rax
  je     L337
  mov    %rbx,%rax
  and    $0xf0000000,%eax
  test   %rax,%rax
  je     L92
  mov    %rbx,%rax
  and    $0xc0000000,%eax
  test   %rax,%rax
  je     L457
  mov    %rbx,%rax
  and    $0x80000000,%eax
  test   %rax,%rax
  je     L404
  mov    $0x20,%eax
  jmp    L220
L404:
  mov    $0x1f,%eax
L220:
  mov    %rax,%rbx
  jmp    L302
L457:
  mov    %rbx,%rax
  and    $0x20000000,%eax
  test   %rax,%rax
  je     L133
  mov    $0x1e,%eax
  jmp    L556
L133:
  mov    $0x1d,%eax
L556:
  mov    %rax,%rbx
  jmp    L302
L92:
  mov    %rbx,%rax
  and    $0xc000000,%eax
  test   %rax,%rax
  je     L144
  mov    %rbx,%rax
  and    $0x8000000,%eax
  test   %rax,%rax
  je     L89
  mov    $0x1c,%eax
  jmp    L223
L89:
  mov    $0x1b,%eax
L223:
  mov    %rax,%rbx
  jmp    L302
L144:
  mov    %rbx,%rax
  and    $0x2000000,%eax
  test   %rax,%rax
  je     L395
  mov    $0x1a,%eax
  jmp    L101
L395:
  mov    $0x19,%eax
L101:
  mov    %rax,%rbx
  jmp    L302
L337:
  mov    %rbx,%rax
  and    $0xf00000,%eax
  test   %rax,%rax
  je     L113
  mov    %rbx,%rax
  and    $0xc00000,%eax
  test   %rax,%rax
  je     L381
  mov    %rbx,%rax
  and    $0x800000,%eax
  test   %rax,%rax
  je     L442
  mov    $0x18,%eax
  jmp    L175
L442:
  mov    $0x17,%eax
L175:
  mov    %rax,%rbx
  jmp    L302
L381:
  mov    %rbx,%rax
  and    $0x200000,%eax
  test   %rax,%rax
  je     L228
  mov    $0x16,%eax
  jmp    L411
L228:
  mov    $0x15,%eax
L411:
  mov    %rax,%rbx
  jmp    L302
L113:
  mov    %rbx,%rax
  and    $0xc0000,%eax
  test   %rax,%rax
  je     L436
  mov    %rbx,%rax
  and    $0x80000,%eax
  test   %rax,%rax
  je     L64
  mov    $0x14,%eax
  jmp    L142
L64:
  mov    $0x13,%eax
L142:
  mov    %rax,%rbx
  jmp    L302
L436:
  mov    %rbx,%rax
  and    $0x20000,%eax
  test   %rax,%rax
  je     L79
  mov    $0x12,%eax
  jmp    L109
L79:
  mov    $0x11,%eax
L109:
  mov    %rax,%rbx
  jmp    L302
L477:
  mov    %rbx,%rax
  and    $0xff00,%eax
  test   %rax,%rax
  je     L518
  mov    %rbx,%rax
  and    $0xf000,%eax
  test   %rax,%rax
  je     L5
  mov    %rbx,%rax
  and    $0xc000,%eax
  test   %rax,%rax
  je     L598
  mov    %rbx,%rax
  and    $0x8000,%eax
  test   %rax,%rax
  je     L468
  mov    $0x10,%eax
  jmp    L502
L468:
  mov    $0xf,%eax
L502:
  mov    %rax,%rbx
  jmp    L302
L598:
  mov    %rbx,%rax
  and    $0x2000,%eax
  test   %rax,%rax
  je     L378
  mov    $0xe,%eax
  jmp    L589
L378:
  mov    $0xd,%eax
L589:
  mov    %rax,%rbx
  jmp    L302
L5:
  mov    %rbx,%rax
  and    $0xc00,%eax
  test   %rax,%rax
  je     L558
  mov    %rbx,%rax
  and    $0x800,%eax
  test   %rax,%rax
  je     L184
  mov    $0xc,%eax
  jmp    L301
L184:
  mov    $0xb,%eax
L301:
  mov    %rax,%rbx
  jmp    L302
L558:
  mov    %rbx,%rax
  and    $0x200,%eax
  test   %rax,%rax
  je     L189
  mov    $0xa,%eax
  jmp    L520
L189:
  mov    $0x9,%eax
L520:
  mov    %rax,%rbx
  jmp    L302
L518:
  mov    %rbx,%rax
  and    $0xf0,%eax
  test   %rax,%rax
  je     L76
  mov    %rbx,%rax
  and    $0xc0,%eax
  test   %rax,%rax
  je     L126
  mov    %rbx,%rax
  and    $0x80,%eax
  test   %rax,%rax
  je     L450
  mov    $0x8,%eax
  jmp    L174
L450:
  mov    $0x7,%eax
L174:
  mov    %rax,%rbx
  jmp    L302
L126:
  mov    %rbx,%rax
  and    $0x20,%eax
  test   %rax,%rax
  je     L488
  mov    $0x6,%eax
  jmp    L218
L488:
  mov    $0x5,%eax
L218:
  mov    %rax,%rbx
  jmp    L302
L76:
  mov    %rbx,%rax
  and    $0xc,%eax
  test   %rax,%rax
  je     L114
  mov    %rbx,%rax
  and    $0x8,%eax
  test   %rax,%rax
  je     L74
  mov    $0x4,%eax
  jmp    L164
L74:
  mov    $0x3,%eax
L164:
  mov    %rax,%rbx
  jmp    L302
L114:
  mov    %rbx,%rax
  and    $0x2,%eax
  test   %rax,%rax
  je     L383
  mov    $0x2,%eax
  jmp    L119
L383:
  mov    $0x1,%eax
L119:
  mov    %rax,%rbx
L302:
  mov    %rbx,%rax
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
long MTX_AHUFF_BitsUsed(register long x) {
  register long n;
  assert(x >= 0);
  if (x & 0xffff0000) {
    if (x & 0xff000000) {
      if (x & 0xf0000000) {
        if (x & 0xC0000000) {
          n = x & 0x80000000 ? 32 : 31;
        } else {
          n = x & 0x20000000 ? 30 : 29;
        }
      } else {
        if (x & 0x0C000000) {
          n = x & 0x08000000 ? 28 : 27;
        } else {
          n = x & 0x02000000 ? 26 : 25;
        }
      }
    } else {
      if (x & 0x00f00000) {
        if (x & 0x00C00000) {
          n = x & 0x00800000 ? 24 : 23;
        } else {
          n = x & 0x00200000 ? 22 : 21;
        }
      } else {
        if (x & 0x000C0000) {
          n = x & 0x00080000 ? 20 : 19;
        } else {
          n = x & 0x00020000 ? 18 : 17;
        }
      }
    }
  } else {
    if (x & 0xff00) {
      if (x & 0xf000) {
        if (x & 0xC000) {
          n = x & 0x8000 ? 16 : 15;
        } else {
          n = x & 0x2000 ? 14 : 13;
        }
      } else {
        if (x & 0x0C00) {
          n = x & 0x0800 ? 12 : 11;
        } else {
          n = x & 0x0200 ? 10 : 9;
        }
      }
    } else {
      if (x & 0xf0) {
        if (x & 0x00C0) {
          n = x & 0x0080 ? 8 : 7;
        } else {
          n = x & 0x0020 ? 6 : 5;
        }
      } else {
        if (x & 0x000C) {
          n = x & 0x0008 ? 4 : 3;
        } else {
          n = x & 0x0002 ? 2 : 1;
        }
      }
    }
  }
  return n;
}
```