user: What is the c source code of the assembly code below?

```asm
<fibonacci>:
  endbr64
  mov    %edi,%eax
  test   %edi,%edi
  je     L89
  cmp    $0x1,%edi
  je     L89
  push   %r15
  lea    -0x2(%rax),%edi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  movl   $0x0,0x4(%rsp)
  mov    %edi,0xc(%rsp)
  cmp    $0x2,%eax
  je     L186
L27:
  sub    $0x1,%eax
  mov    %eax,0x10(%rsp)
  cmp    $0x1,%edi
  je     L445
  xor    %r10d,%r10d
  mov    %r10d,(%rsp)
L72:
  mov    0xc(%rsp),%eax
  lea    -0x2(%rax),%edi
  mov    %edi,0x8(%rsp)
  cmp    $0x2,%eax
  je     L420
  sub    $0x1,%eax
  mov    %eax,0xc(%rsp)
  cmp    $0x1,%edi
  je     L114
  xor    %esi,%esi
L196:
  mov    0x8(%rsp),%eax
  lea    -0x2(%rax),%r10d
  cmp    $0x2,%eax
  je     L16
  sub    $0x1,%eax
  mov    %eax,0x8(%rsp)
  cmp    $0x1,%r10d
  je     L365
  mov    %esi,0x14(%rsp)
  xor    %r8d,%r8d
  mov    %r8d,%r15d
L223:
  lea    -0x2(%r10),%r11d
  cmp    $0x2,%r10d
  je     L319
  sub    $0x1,%r10d
  cmp    $0x1,%r11d
  je     L425
  mov    %r10d,0x1c(%rsp)
  xor    %r9d,%r9d
  mov    %r15d,0x18(%rsp)
  mov    %r9d,%r14d
  mov    %r11d,%r15d
L181:
  lea    -0x2(%r15),%edx
  cmp    $0x2,%r15d
  je     L202
  sub    $0x1,%r15d
  cmp    $0x1,%edx
  je     L194
  xor    %r13d,%r13d
  mov    %r14d,%esi
  mov    %r15d,%r8d
  mov    %r13d,%ecx
L484:
  lea    -0x2(%rdx),%r12d
  cmp    $0x2,%edx
  je     L67
  sub    $0x1,%edx
  cmp    $0x1,%r12d
  je     L230
  xor    %ebx,%ebx
L51:
  lea    -0x2(%r12),%r13d
  cmp    $0x2,%r12d
  je     L39
L231:
  sub    $0x1,%r12d
  cmp    $0x1,%r13d
  je     L106
  xor    %ebp,%ebp
L207:
  lea    -0x2(%r13),%r15d
  cmp    $0x2,%r13d
  je     L389
L441:
  sub    $0x1,%r13d
  cmp    $0x1,%r15d
  je     L316
  mov    %r12d,0x20(%rsp)
  xor    %r14d,%r14d
  mov    %ebp,%r12d
  mov    %ecx,%ebp
  mov    %ebx,0x24(%rsp)
  mov    %esi,%ebx
  mov    %r13d,0x28(%rsp)
  mov    %r8d,%r13d
L285:
  lea    -0x2(%r15),%edi
  mov    %edx,0x2c(%rsp)
  call   <fibonacci>
  mov    0x2c(%rsp),%edx
  add    %eax,%r14d
  sub    $0x1,%r15d
  je     L337
  cmp    $0x1,%r15d
  jne    L285
  mov    %ebx,%esi
  mov    %ebp,%ecx
  mov    %r13d,%r8d
  mov    %r12d,%ebp
  mov    0x24(%rsp),%ebx
  mov    0x20(%rsp),%r12d
  add    $0x1,%r14d
  mov    0x28(%rsp),%r13d
L486:
  add    %r14d,%ebp
  test   %r13d,%r13d
  jne    L452
L424:
  add    %ebp,%ebx
  test   %r12d,%r12d
  jne    L99
  add    %ebx,%ecx
  test   %edx,%edx
  jne    L418
L147:
  mov    %esi,%r14d
  mov    %ecx,%r13d
  mov    %r8d,%r15d
L526:
  add    %r13d,%r14d
  test   %r15d,%r15d
  jne    L433
  mov    0x18(%rsp),%r15d
  mov    0x1c(%rsp),%r10d
  mov    %r14d,%r9d
  add    %r9d,%r15d
  test   %r10d,%r10d
  je     L226
L489:
  cmp    $0x1,%r10d
  jne    L223
L319:
  mov    0x14(%rsp),%esi
  mov    %r15d,%r8d
  mov    0x8(%rsp),%edi
  add    $0x1,%r8d
  add    %r8d,%esi
  test   %edi,%edi
  jne    L87
L439:
  mov    0xc(%rsp),%ecx
  add    %esi,(%rsp)
  test   %ecx,%ecx
  je     L164
L335:
  cmpl   $0x1,0xc(%rsp)
  jne    L72
L420:
  mov    (%rsp),%r10d
  mov    0x4(%rsp),%eax
  mov    0x10(%rsp),%edx
  add    $0x1,%r10d
  add    %r10d,%eax
  test   %edx,%edx
  jne    L457
L295:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L106:
  add    $0x1,%ebx
  lea    -0x2(%r12),%r13d
  cmp    $0x2,%r12d
  jne    L231
L39:
  add    $0x1,%ebx
L314:
  add    %ebx,%ecx
  test   %edx,%edx
  je     L147
L418:
  cmp    $0x1,%edx
  jne    L484
L67:
  mov    %ecx,%r13d
  mov    %esi,%r14d
  mov    %r8d,%r15d
  add    $0x1,%r13d
  jmp    L526
L230:
  add    $0x1,%ecx
  jmp    L484
  nopw   0x0(%rax,%rax,1)
L337:
  mov    %ebx,%esi
  mov    %ebp,%ecx
  mov    %r13d,%r8d
  mov    %r12d,%ebp
  mov    0x24(%rsp),%ebx
  mov    0x20(%rsp),%r12d
  mov    0x28(%rsp),%r13d
  jmp    L486
L433:
  cmp    $0x1,%r15d
  jne    L181
L202:
  mov    0x18(%rsp),%r15d
  mov    %r14d,%r9d
  mov    0x1c(%rsp),%r10d
  add    $0x1,%r9d
  add    %r9d,%r15d
  test   %r10d,%r10d
  jne    L489
L226:
  mov    0x14(%rsp),%esi
  mov    0x8(%rsp),%edi
  mov    %r15d,%r8d
  add    %r8d,%esi
  test   %edi,%edi
  je     L439
L87:
  cmpl   $0x1,0x8(%rsp)
  jne    L196
L16:
  mov    0xc(%rsp),%ecx
  add    $0x1,%esi
  add    %esi,(%rsp)
  test   %ecx,%ecx
  jne    L335
L164:
  mov    (%rsp),%r10d
  mov    0x4(%rsp),%eax
  mov    0x10(%rsp),%edx
  add    %r10d,%eax
  test   %edx,%edx
  je     L295
L457:
  cmpl   $0x1,0x10(%rsp)
  je     L84
L479:
  mov    %eax,0x4(%rsp)
  mov    0x10(%rsp),%eax
  lea    -0x2(%rax),%edi
  mov    %edi,0xc(%rsp)
  cmp    $0x2,%eax
  jne    L27
L186:
  mov    0x4(%rsp),%eax
L84:
  add    $0x38,%rsp
  add    $0x1,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L316:
  add    $0x1,%ebp
  lea    -0x2(%r13),%r15d
  cmp    $0x2,%r13d
  jne    L441
  nopl   0x0(%rax)
L389:
  add    $0x1,%ebp
  jmp    L424
L194:
  add    $0x1,%r14d
  jmp    L181
L425:
  add    $0x1,%r15d
  jmp    L223
L99:
  cmp    $0x1,%r12d
  jne    L51
  add    $0x1,%ebx
  jmp    L314
L452:
  cmp    $0x1,%r13d
  jne    L207
  add    $0x1,%ebp
  jmp    L424
L365:
  add    $0x1,%esi
  jmp    L196
L114:
  addl   $0x1,(%rsp)
  jmp    L72
L445:
  mov    0x4(%rsp),%eax
  add    $0x1,%eax
  jmp    L479
L89:
  ret
```

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