user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    $0x0,%edi
  call   <__builtin_subcl@plt>
  or     (%rsp),%rax
  jne    L528
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    $0xffffffffffffffff,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xffffffffffffffff,%rax
  jne    L350
  cmpq   $0x0,(%rsp)
  jne    L89
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0x0,%edi
  call   <__builtin_subcl@plt>
  cmp    $0x1,%rax
  jne    L230
  cmpq   $0x1,(%rsp)
  jne    L247
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0x1,%esi
  mov    $0xffffffffffffffff,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xfffffffffffffffe,%rax
  jne    L88
  cmpq   $0x0,(%rsp)
  jne    L524
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0x1,%edi
  call   <__builtin_subcl@plt>
  cmp    $0x2,%rax
  jne    L290
  cmpq   $0x1,(%rsp)
  jne    L494
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0xffffffffffffffff,%rdi
  call   <__builtin_subcl@plt>
  or     (%rsp),%rax
  jne    L493
  mov    %rsp,%rcx
  mov    $0x0,%edx
  movabs $0xfffffffffffffff,%rsi
  movabs $0x8fffffffffffffff,%rdi
  call   <__builtin_subcl@plt>
  movabs $0x8000000000000000,%rdx
  cmp    %rdx,%rax
  jne    L237
  cmpq   $0x0,(%rsp)
  je     L482
L237:
  mov    0x8(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L37
  add    $0x18,%rsp
  ret
L482:
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0xfffffffffffffffe,%rsi
  mov    $0x0,%edi
  call   <__builtin_subcl@plt>
  cmp    $0x1,%rax
  jne    L418
  cmpq   $0x1,(%rsp)
  jne    L536
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0x0,%edi
  call   <__builtin_subcl@plt>
  test   %rax,%rax
  jne    L249
  cmpq   $0x1,(%rsp)
  jne    L10
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0x0,%esi
  mov    $0xfffffffffffffffe,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xfffffffffffffffd,%rax
  jne    L54
  cmpq   $0x0,(%rsp)
  jne    L153
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0xfffffffffffffffe,%rsi
  mov    $0xfffffffffffffffe,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xffffffffffffffff,%rax
  jne    L237
  cmpq   $0x1,(%rsp)
  jne    L237
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0xfffffffffffffffe,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xffffffffffffffff,%rax
  jne    L237
  cmpq   $0x1,(%rsp)
  jne    L237
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0xfffffffffffffffe,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xfffffffffffffffe,%rax
  jne    L237
  cmpq   $0x1,(%rsp)
  jne    L237
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0x0,%esi
  mov    $0xffffffffffffffff,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xfffffffffffffffe,%rax
  jne    L165
  cmpq   $0x0,(%rsp)
  jne    L389
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0xffffffffffffffff,%rsi
  mov    $0xffffffffffffffff,%rdi
  call   <__builtin_subcl@plt>
  cmp    $0xffffffffffffffff,%rax
  jne    L231
  cmpq   $0x1,(%rsp)
  jne    L56
  mov    %rsp,%rcx
  mov    $0x0,%edx
  mov    $0x1,%esi
  mov    $0xf,%edi
  call   <__builtin_subcl@plt>
  cmp    $0xe,%rax
  jne    L119
  cmpq   $0x0,(%rsp)
  jne    L30
  mov    %rsp,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  mov    $0xf,%edi
  call   <__builtin_subcl@plt>
  cmp    $0xd,%rax
  jne    L149
  mov    (%rsp),%rax
  neg    %rax
  sbb    %eax,%eax
  jmp    L237
L528:
  mov    $0xffffffff,%eax
  jmp    L237
L350:
  mov    $0xffffffff,%eax
  jmp    L237
L89:
  mov    $0xffffffff,%eax
  jmp    L237
L230:
  mov    $0xffffffff,%eax
  jmp    L237
L247:
  mov    $0xffffffff,%eax
  jmp    L237
L88:
  mov    $0xffffffff,%eax
  jmp    L237
L524:
  mov    $0xffffffff,%eax
  jmp    L237
L290:
  mov    $0xffffffff,%eax
  jmp    L237
L494:
  mov    $0xffffffff,%eax
  jmp    L237
L493:
  mov    $0xffffffff,%eax
  jmp    L237
L418:
  mov    $0xffffffff,%eax
  jmp    L237
L536:
  mov    $0xffffffff,%eax
  jmp    L237
L249:
  mov    $0xffffffff,%eax
  jmp    L237
L10:
  mov    $0xffffffff,%eax
  jmp    L237
L54:
  mov    $0xffffffff,%eax
  jmp    L237
L153:
  mov    $0xffffffff,%eax
  jmp    L237
L165:
  mov    $0xffffffff,%eax
  jmp    L237
L389:
  mov    $0xffffffff,%eax
  jmp    L237
L231:
  mov    $0xffffffff,%eax
  jmp    L237
L56:
  mov    $0xffffffff,%eax
  jmp    L237
L119:
  mov    $0xffffffff,%eax
  jmp    L237
L30:
  mov    $0xffffffff,%eax
  jmp    L237
L149:
  mov    $0xffffffff,%eax
  jmp    L237
L37:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int main(int argc, const char **argv) {
  unsigned long carryout, res;
  res = __builtin_subcl((unsigned long)0x0, (unsigned long)0x0, 0, &carryout);
  if (res != 0x0 || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0x0, 0, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFF || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0x0, (unsigned long)0xFFFFFFFFFFFFFFFF, 0, &carryout);
  if (res != 0x01 || carryout != 1) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0x1, 0, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFE || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0x1, (unsigned long)0xFFFFFFFFFFFFFFFF, 0, &carryout);
  if (res != 0x2 || carryout != 1) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0xFFFFFFFFFFFFFFFF, 0, &carryout);
  if (res != 0x0 || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0x8FFFFFFFFFFFFFFF, (unsigned long)0x0FFFFFFFFFFFFFFF, 0, &carryout);
  if (res != 0x8000000000000000 || carryout != 0) {
    return res;
  }
  res = __builtin_subcl((unsigned long)0x0, (unsigned long)0xFFFFFFFFFFFFFFFE, 1, &carryout);
  if (res != 0x1 || carryout != 1) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0x0, (unsigned long)0xFFFFFFFFFFFFFFFF, 1, &carryout);
  if (res != 0x0 || carryout != 1) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFE, (unsigned long)0x0, 1, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFD || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFE, (unsigned long)0xFFFFFFFFFFFFFFFE, 1, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFF || carryout != 1) {
    return res;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFE, (unsigned long)0xFFFFFFFFFFFFFFFF, 0, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFF || carryout != 1) {
    return res;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFE, (unsigned long)0xFFFFFFFFFFFFFFFF, 1, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFE || carryout != 1) {
    return res;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0x0, 1, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFE || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0xFFFFFFFFFFFFFFFF, (unsigned long)0xFFFFFFFFFFFFFFFF, 1, &carryout);
  if (res != 0xFFFFFFFFFFFFFFFF || carryout != 1) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0x0F, (unsigned long)0x1, 0, &carryout);
  if (res != 0x0E || carryout != 0) {
    return -1;
  }
  res = __builtin_subcl((unsigned long)0x0F, (unsigned long)0x1, 1, &carryout);
  if (res != 0x0D || carryout != 0) {
    return -1;
  }
  return 0;
}
```