user: Please show me the C implementation that matches the assembly code listed below:

```asm
<fib>:
  endbr64
  mov    %edi,%r10d
  test   %edi,%edi
  je     L513
  cmp    $0x1,%edi
  je     L513
  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)
L404:
  mov    0x4(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L287
  cmp    $0x1,%eax
  je     L403
  lea    -0x1(%rdi),%eax
  xor    %r8d,%r8d
  mov    %eax,0x8(%rsp)
  mov    %r8d,0x14(%rsp)
L243:
  mov    0x8(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L522
  cmp    $0x1,%eax
  je     L239
  lea    -0x1(%rdi),%eax
  xor    %ecx,%ecx
  mov    %eax,0xc(%rsp)
  mov    %ecx,0x18(%rsp)
L26:
  mov    0xc(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L505
  cmp    $0x1,%eax
  je     L117
  xor    %ecx,%ecx
  lea    -0x1(%rdi),%r8d
  mov    %ecx,0x1c(%rsp)
  mov    %r8d,%ecx
L201:
  mov    %ecx,%eax
  add    $0x1,%eax
  je     L357
  cmp    $0x1,%eax
  je     L108
  xor    %esi,%esi
  mov    %ecx,0x20(%rsp)
  lea    -0x1(%rcx),%r9d
  mov    %esi,(%rsp)
  mov    %r9d,%r15d
L406:
  mov    %r15d,%eax
  add    $0x1,%eax
  je     L171
  cmp    $0x1,%eax
  je     L479
  lea    -0x1(%r15),%r12d
  xor    %ecx,%ecx
  mov    %r15d,%esi
L260:
  mov    %r12d,%eax
  add    $0x1,%eax
  je     L276
  cmp    $0x1,%eax
  je     L311
  xor    %ebx,%ebx
  lea    -0x1(%r12),%ebp
  mov    %r12d,%edx
  mov    %ebx,%r12d
L291:
  mov    %ebp,%eax
  add    $0x1,%eax
  je     L372
  cmp    $0x1,%eax
  je     L515
  mov    %ebp,%eax
  lea    -0x1(%rbp),%ebx
  xor    %r14d,%r14d
  mov    %ecx,%ebp
  mov    %eax,%ecx
L148:
  mov    %ebx,%r13d
  add    $0x1,%r13d
  je     L327
  cmp    $0x1,%r13d
  je     L199
  mov    %ebx,0x24(%rsp)
  xor    %r15d,%r15d
  mov    %esi,%ebx
L271:
  lea    -0x1(%r13),%edi
  mov    %ecx,0x2c(%rsp)
  mov    %edx,0x28(%rsp)
  call   <fib>
  mov    0x28(%rsp),%edx
  mov    0x2c(%rsp),%ecx
  add    %eax,%r15d
  sub    $0x2,%r13d
  je     L483
  cmp    $0x1,%r13d
  jne    L271
  mov    %ebx,%esi
  mov    0x24(%rsp),%ebx
  add    $0x1,%r15d
L397:
  add    %r15d,%r14d
  test   %ebx,%ebx
  je     L478
  cmp    $0x1,%ebx
  jne    L327
L199:
  mov    %ecx,%eax
  add    $0x1,%r14d
  mov    %ebp,%ecx
  mov    %eax,%ebp
  add    %r14d,%r12d
  test   %ebp,%ebp
  je     L95
L272:
  cmp    $0x1,%ebp
  jne    L372
L515:
  mov    %r12d,%ebx
  mov    %edx,%r12d
  add    $0x1,%ebx
L302:
  add    %ebx,%ecx
  test   %r12d,%r12d
  jne    L237
  mov    %esi,%r15d
  mov    %ecx,%r14d
  add    %r14d,(%rsp)
  mov    (%rsp),%esi
  test   %r15d,%r15d
  jne    L88
L306:
  mov    0x20(%rsp),%ecx
  add    %esi,0x1c(%rsp)
  test   %ecx,%ecx
  je     L454
L435:
  cmp    $0x1,%ecx
  je     L108
L357:
  sub    $0x2,%ecx
  jmp    L201
L372:
  sub    $0x2,%ebp
  jmp    L291
L237:
  cmp    $0x1,%r12d
  jne    L276
L311:
  mov    %ecx,%r14d
  mov    %esi,%r15d
  add    $0x1,%r14d
  add    %r14d,(%rsp)
  mov    (%rsp),%esi
  test   %r15d,%r15d
  je     L306
L88:
  cmp    $0x1,%r15d
  je     L467
L171:
  sub    $0x2,%r15d
  jmp    L406
L276:
  sub    $0x2,%r12d
  jmp    L260
L478:
  mov    %ecx,%eax
  mov    %ebp,%ecx
  add    %r14d,%r12d
  mov    %eax,%ebp
  test   %ebp,%ebp
  jne    L272
L95:
  mov    %r12d,%ebx
  mov    %edx,%r12d
  jmp    L302
  nopl   (%rax)
L483:
  mov    %ebx,%esi
  mov    0x24(%rsp),%ebx
  jmp    L397
L479:
  mov    (%rsp),%esi
L467:
  mov    0x20(%rsp),%ecx
  add    $0x1,%esi
  add    %esi,0x1c(%rsp)
  test   %ecx,%ecx
  jne    L435
L454:
  mov    0x1c(%rsp),%ecx
  add    %ecx,0x18(%rsp)
  mov    0xc(%rsp),%ecx
  test   %ecx,%ecx
  jne    L0
L82:
  mov    0x8(%rsp),%edx
  mov    0x18(%rsp),%ecx
  add    %ecx,0x14(%rsp)
  test   %edx,%edx
  jne    L29
L375:
  mov    0x14(%rsp),%r8d
  jmp    L493
L327:
  sub    $0x2,%ebx
  jmp    L148
L108:
  mov    0x1c(%rsp),%ecx
  add    $0x1,%ecx
  add    %ecx,0x18(%rsp)
  mov    0xc(%rsp),%ecx
  test   %ecx,%ecx
  je     L82
L0:
  cmpl   $0x1,0xc(%rsp)
  je     L117
L505:
  subl   $0x2,0xc(%rsp)
  jmp    L26
L117:
  mov    0x18(%rsp),%ecx
  mov    0x8(%rsp),%edx
  add    $0x1,%ecx
  add    %ecx,0x14(%rsp)
  test   %edx,%edx
  je     L375
L29:
  cmpl   $0x1,0x8(%rsp)
  je     L239
L522:
  subl   $0x2,0x8(%rsp)
  jmp    L243
L239:
  mov    0x14(%rsp),%r8d
  add    $0x1,%r8d
L493:
  mov    0x4(%rsp),%eax
  add    %r8d,0x10(%rsp)
  test   %eax,%eax
  je     L395
  cmpl   $0x1,0x4(%rsp)
  jne    L287
L403:
  mov    0x10(%rsp),%r10d
  add    $0x1,%r10d
L400:
  add    $0x38,%rsp
  mov    %r10d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L287:
  subl   $0x2,0x4(%rsp)
  jmp    L404
L513:
  mov    %r10d,%eax
  ret
L395:
  mov    0x10(%rsp),%r10d
  jmp    L400
```

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