user: 请从给定的汇编指令推导出C源代码：

```asm
<fibo>:
  endbr64
  mov    %edi,%r10d
  test   %edi,%edi
  je     L196
  cmp    $0x1,%edi
  je     L196
  push   %r15
  lea    -0x2(%rdi),%eax
  xor    %r10d,%r10d
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %eax,0x4(%rsp)
  mov    %r10d,0x10(%rsp)
L197:
  mov    0x4(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L390
  cmp    $0x1,%eax
  je     L372
  lea    -0x1(%rdi),%eax
  xor    %r8d,%r8d
  mov    %eax,0x8(%rsp)
  mov    %r8d,0x14(%rsp)
L286:
  mov    0x8(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L0
  cmp    $0x1,%eax
  je     L75
  lea    -0x1(%rdi),%eax
  xor    %ecx,%ecx
  mov    %eax,0xc(%rsp)
  mov    %ecx,0x18(%rsp)
L298:
  mov    0xc(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L271
  cmp    $0x1,%eax
  je     L335
  xor    %ecx,%ecx
  lea    -0x1(%rdi),%r8d
  mov    %ecx,0x1c(%rsp)
  mov    %r8d,%ecx
L353:
  mov    %ecx,%eax
  add    $0x1,%eax
  je     L379
  cmp    $0x1,%eax
  je     L34
  xor    %esi,%esi
  mov    %ecx,0x20(%rsp)
  lea    -0x1(%rcx),%r9d
  mov    %esi,(%rsp)
  mov    %r9d,%r15d
L365:
  mov    %r15d,%eax
  add    $0x1,%eax
  je     L118
  cmp    $0x1,%eax
  je     L366
  lea    -0x1(%r15),%r12d
  xor    %ecx,%ecx
  mov    %r15d,%esi
L427:
  mov    %r12d,%eax
  add    $0x1,%eax
  je     L18
  cmp    $0x1,%eax
  je     L227
  xor    %ebx,%ebx
  lea    -0x1(%r12),%ebp
  mov    %r12d,%edx
  mov    %ebx,%r12d
L260:
  mov    %ebp,%eax
  add    $0x1,%eax
  je     L492
  cmp    $0x1,%eax
  je     L25
  mov    %ebp,%eax
  lea    -0x1(%rbp),%ebx
  xor    %r14d,%r14d
  mov    %ecx,%ebp
  mov    %eax,%ecx
L191:
  mov    %ebx,%r13d
  add    $0x1,%r13d
  je     L256
  cmp    $0x1,%r13d
  je     L484
  mov    %ebx,0x24(%rsp)
  xor    %r15d,%r15d
  mov    %esi,%ebx
L263:
  lea    -0x1(%r13),%edi
  mov    %ecx,0x2c(%rsp)
  mov    %edx,0x28(%rsp)
  call   <fibo>
  mov    0x28(%rsp),%edx
  mov    0x2c(%rsp),%ecx
  add    %eax,%r15d
  sub    $0x2,%r13d
  je     L37
  cmp    $0x1,%r13d
  jne    L263
  mov    %ebx,%esi
  mov    0x24(%rsp),%ebx
  add    $0x1,%r15d
L141:
  add    %r15d,%r14d
  test   %ebx,%ebx
  je     L378
  cmp    $0x1,%ebx
  jne    L256
L484:
  mov    %ecx,%eax
  add    $0x1,%r14d
  mov    %ebp,%ecx
  mov    %eax,%ebp
  add    %r14d,%r12d
  test   %ebp,%ebp
  je     L448
L145:
  cmp    $0x1,%ebp
  jne    L492
L25:
  mov    %r12d,%ebx
  mov    %edx,%r12d
  add    $0x1,%ebx
L105:
  add    %ebx,%ecx
  test   %r12d,%r12d
  jne    L452
  mov    %esi,%r15d
  mov    %ecx,%r14d
  add    %r14d,(%rsp)
  mov    (%rsp),%esi
  test   %r15d,%r15d
  jne    L396
L132:
  mov    0x20(%rsp),%ecx
  add    %esi,0x1c(%rsp)
  test   %ecx,%ecx
  je     L476
L240:
  cmp    $0x1,%ecx
  je     L34
L379:
  sub    $0x2,%ecx
  jmp    L353
L492:
  sub    $0x2,%ebp
  jmp    L260
L452:
  cmp    $0x1,%r12d
  jne    L18
L227:
  mov    %ecx,%r14d
  mov    %esi,%r15d
  add    $0x1,%r14d
  add    %r14d,(%rsp)
  mov    (%rsp),%esi
  test   %r15d,%r15d
  je     L132
L396:
  cmp    $0x1,%r15d
  je     L381
L118:
  sub    $0x2,%r15d
  jmp    L365
L18:
  sub    $0x2,%r12d
  jmp    L427
L378:
  mov    %ecx,%eax
  mov    %ebp,%ecx
  add    %r14d,%r12d
  mov    %eax,%ebp
  test   %ebp,%ebp
  jne    L145
L448:
  mov    %r12d,%ebx
  mov    %edx,%r12d
  jmp    L105
  nopl   (%rax)
L37:
  mov    %ebx,%esi
  mov    0x24(%rsp),%ebx
  jmp    L141
L366:
  mov    (%rsp),%esi
L381:
  mov    0x20(%rsp),%ecx
  add    $0x1,%esi
  add    %esi,0x1c(%rsp)
  test   %ecx,%ecx
  jne    L240
L476:
  mov    0x1c(%rsp),%ecx
  add    %ecx,0x18(%rsp)
  mov    0xc(%rsp),%ecx
  test   %ecx,%ecx
  jne    L192
L26:
  mov    0x8(%rsp),%edx
  mov    0x18(%rsp),%ecx
  add    %ecx,0x14(%rsp)
  test   %edx,%edx
  jne    L193
L377:
  mov    0x14(%rsp),%r8d
  jmp    L451
L256:
  sub    $0x2,%ebx
  jmp    L191
L34:
  mov    0x1c(%rsp),%ecx
  add    $0x1,%ecx
  add    %ecx,0x18(%rsp)
  mov    0xc(%rsp),%ecx
  test   %ecx,%ecx
  je     L26
L192:
  cmpl   $0x1,0xc(%rsp)
  je     L335
L271:
  subl   $0x2,0xc(%rsp)
  jmp    L298
L335:
  mov    0x18(%rsp),%ecx
  mov    0x8(%rsp),%edx
  add    $0x1,%ecx
  add    %ecx,0x14(%rsp)
  test   %edx,%edx
  je     L377
L193:
  cmpl   $0x1,0x8(%rsp)
  je     L75
L0:
  subl   $0x2,0x8(%rsp)
  jmp    L286
L75:
  mov    0x14(%rsp),%r8d
  add    $0x1,%r8d
L451:
  mov    0x4(%rsp),%eax
  add    %r8d,0x10(%rsp)
  test   %eax,%eax
  je     L485
  cmpl   $0x1,0x4(%rsp)
  jne    L390
L372:
  mov    0x10(%rsp),%r10d
  add    $0x1,%r10d
L261:
  add    $0x38,%rsp
  mov    %r10d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L390:
  subl   $0x2,0x4(%rsp)
  jmp    L197
L196:
  mov    %r10d,%eax
  ret
L485:
  mov    0x10(%rsp),%r10d
  jmp    L261
```

assistant: ```c
int fibo(int n) {
  if (n == 0)
    return 0;
  if (n == 1)
    return 1;
  else
    return fibo(n - 1) + fibo(n - 2);
}
```