user: What would the C source look like for the assembly code provided here:

```asm
<fib>:
  endbr64
  test   %edi,%edi
  jle    L214
  mov    %edi,%r11d
  cmp    $0x1,%edi
  je     L29
  push   %r15
  xor    %r11d,%r11d
  lea    -0x2(%rdi),%esi
  push   %r14
  mov    %esi,%r9d
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %r11d,(%rsp)
L213:
  lea    0x1(%r9),%eax
  xor    %r11d,%r11d
  mov    %r9d,0x28(%rsp)
  mov    %eax,0x20(%rsp)
  mov    %r11d,0x4(%rsp)
L28:
  mov    0x20(%rsp),%eax
  cmp    $0x1,%eax
  je     L109
  sub    $0x1,%eax
  xor    %esi,%esi
  mov    %eax,0x24(%rsp)
  mov    %esi,0x8(%rsp)
L209:
  mov    0x24(%rsp),%eax
  cmp    $0x1,%eax
  je     L114
  xor    %esi,%esi
  lea    -0x1(%rax),%r9d
  mov    %esi,0xc(%rsp)
  mov    %r9d,%esi
L6:
  cmp    $0x1,%esi
  je     L90
  xor    %r8d,%r8d
  mov    %esi,0x2c(%rsp)
  lea    -0x1(%rsi),%r10d
  mov    %r8d,0x10(%rsp)
  mov    %r10d,%r15d
L251:
  cmp    $0x1,%r15d
  je     L19
  lea    -0x1(%r15),%r12d
  mov    %r15d,%esi
  xor    %ecx,%ecx
  mov    %r12d,%r15d
L246:
  cmp    $0x1,%r15d
  je     L129
  xor    %r13d,%r13d
  lea    -0x1(%r15),%ebx
  mov    %r15d,%edx
  mov    %r13d,%r15d
L142:
  cmp    $0x1,%ebx
  je     L227
  mov    %ebx,%eax
  lea    -0x1(%rbx),%r13d
  xor    %r12d,%r12d
  mov    %edx,%ebx
  mov    %r15d,%edx
  mov    %ecx,%r15d
  mov    %eax,%ecx
L240:
  cmp    $0x1,%r13d
  je     L264
  mov    %r13d,0x14(%rsp)
  lea    -0x1(%r13),%ebp
  xor    %r14d,%r14d
  mov    %r12d,%r13d
  mov    %edx,%r12d
L194:
  cmp    $0x1,%ebp
  je     L74
  lea    -0x1(%rbp),%edi
  mov    %ecx,0x1c(%rsp)
  mov    %esi,0x18(%rsp)
  call   <fib>
  mov    0x18(%rsp),%esi
  mov    0x1c(%rsp),%ecx
  add    %eax,%r14d
  sub    $0x2,%ebp
  jne    L194
  mov    %r12d,%edx
  mov    %r13d,%r12d
  mov    0x14(%rsp),%r13d
L10:
  add    %r14d,%r12d
  sub    $0x2,%r13d
  jne    L240
  mov    %ecx,%eax
  mov    %r15d,%ecx
  mov    %edx,%r15d
  mov    %ebx,%edx
  mov    %eax,%ebx
L144:
  add    %r12d,%r15d
  sub    $0x2,%ebx
  jne    L142
  mov    %r15d,%r13d
  mov    %edx,%r15d
L166:
  add    %r13d,%ecx
  sub    $0x2,%r15d
  jne    L246
  mov    %esi,%r15d
L12:
  add    %ecx,0x10(%rsp)
  sub    $0x2,%r15d
  jne    L251
  mov    0x2c(%rsp),%esi
  mov    0x10(%rsp),%r8d
L31:
  add    %r8d,0xc(%rsp)
  sub    $0x2,%esi
  jne    L6
  mov    0xc(%rsp),%esi
L48:
  add    %esi,0x8(%rsp)
  subl   $0x2,0x24(%rsp)
  jne    L209
  mov    0x8(%rsp),%esi
L104:
  add    %esi,0x4(%rsp)
  subl   $0x2,0x20(%rsp)
  jne    L28
  mov    0x28(%rsp),%r9d
  mov    0x4(%rsp),%r11d
  add    %r11d,(%rsp)
  mov    %r9d,%eax
  test   %r9d,%r9d
  jg     L133
L147:
  mov    (%rsp),%r11d
  jmp    L184
  cs nopw 0x0(%rax,%rax,1)
L74:
  mov    %r12d,%edx
  add    $0x1,%r14d
  mov    %r13d,%r12d
  mov    0x14(%rsp),%r13d
  jmp    L10
  nopl   0x0(%rax)
L264:
  mov    %ecx,%eax
  add    $0x1,%r12d
  mov    %r15d,%ecx
  mov    %edx,%r15d
  mov    %ebx,%edx
  mov    %eax,%ebx
  jmp    L144
L129:
  mov    %esi,%r15d
  add    $0x1,%ecx
  jmp    L12
L227:
  mov    %r15d,%r13d
  mov    %edx,%r15d
  add    $0x1,%r13d
  jmp    L166
L19:
  mov    0x10(%rsp),%r8d
  mov    0x2c(%rsp),%esi
  add    $0x1,%r8d
  jmp    L31
L90:
  mov    0xc(%rsp),%esi
  add    $0x1,%esi
  jmp    L48
L114:
  mov    0x8(%rsp),%esi
  add    $0x1,%esi
  jmp    L104
L109:
  mov    0x4(%rsp),%r11d
  mov    0x28(%rsp),%r9d
  add    $0x1,%r11d
  mov    %r9d,%eax
  add    %r11d,(%rsp)
  test   %r9d,%r9d
  jle    L147
L133:
  sub    $0x2,%r9d
  cmp    $0x1,%eax
  jne    L213
  mov    (%rsp),%r11d
  add    $0x1,%r11d
L184:
  add    $0x38,%rsp
  mov    %r11d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L214:
  xor    %r11d,%r11d
L29:
  mov    %r11d,%eax
  ret
```

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