user: 下面的汇编指令对应的C源代码是什么：

```asm
<main>:
  endbr64
  sub    $0x8,%rsp
  xor    %esi,%esi
  xor    %edi,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  je     L61
L85:
  mov    $0x1,%eax
L168:
  add    $0x8,%rsp
  ret
L61:
  xor    %esi,%esi
  xor    %edi,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  xor    %edi,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x1,%esi
  mov    $0x1,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x1,%esi
  mov    $0x1,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x1,%esi
  mov    $0x1,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x2,%esi
  mov    $0x2,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x2,%esi
  mov    $0x2,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  xor    %edi,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  xor    %edi,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  or     $0xffffffff,%esi
  or     $0xffffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  or     $0xffffffff,%esi
  or     $0xffffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  or     $0xffffffff,%esi
  or     $0xffffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0xfffffffe,%esi
  mov    $0xfffffffe,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0xfffffffe,%esi
  mov    $0xfffffffe,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  mov    $0x7fffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  mov    $0x7fffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  mov    $0x80000000,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  xor    %esi,%esi
  mov    $0x80000000,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0xfffffc00,%esi
  mov    $0x7fffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0xfffff800,%esi
  mov    $0x7fffffff,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x400,%esi
  mov    $0x80000000,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  jne    L85
  mov    $0x800,%esi
  mov    $0x80000000,%edi
  call   <test__fixdfdi@plt>
  test   %rax,%rax
  setne  %al
  movzbl %al,%eax
  jmp    L168
```

assistant: ```c
int main() {
  if (test__fixdfdi(0.0, 0))
    return 1;
  if (test__fixdfdi(0.5, 0))
    return 1;
  if (test__fixdfdi(0.99, 0))
    return 1;
  if (test__fixdfdi(1.0, 1))
    return 1;
  if (test__fixdfdi(1.5, 1))
    return 1;
  if (test__fixdfdi(1.99, 1))
    return 1;
  if (test__fixdfdi(2.0, 2))
    return 1;
  if (test__fixdfdi(2.01, 2))
    return 1;
  if (test__fixdfdi(-0.5, 0))
    return 1;
  if (test__fixdfdi(-0.99, 0))
    return 1;
  if (test__fixdfdi(-1.0, -1))
    return 1;
  if (test__fixdfdi(-1.5, -1))
    return 1;
  if (test__fixdfdi(-1.99, -1))
    return 1;
  if (test__fixdfdi(-2.0, -2))
    return 1;
  if (test__fixdfdi(-2.01, -2))
    return 1;
  if (test__fixdfdi(0x1.FFFFFEp+62, 0x7FFFFF8000000000LL))
    return 1;
  if (test__fixdfdi(0x1.FFFFFCp+62, 0x7FFFFF0000000000LL))
    return 1;
  if (test__fixdfdi(-0x1.FFFFFEp+62, 0x8000008000000000LL))
    return 1;
  if (test__fixdfdi(-0x1.FFFFFCp+62, 0x8000010000000000LL))
    return 1;
  if (test__fixdfdi(0x1.FFFFFFFFFFFFFp+62, 0x7FFFFFFFFFFFFC00LL))
    return 1;
  if (test__fixdfdi(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFFFFFFF800LL))
    return 1;
  if (test__fixdfdi(-0x1.FFFFFFFFFFFFFp+62, 0x8000000000000400LL))
    return 1;
  if (test__fixdfdi(-0x1.FFFFFFFFFFFFEp+62, 0x8000000000000800LL))
    return 1;
  return 0;
}
```