user: Demonstrate the C code that generates the assembly output below:

```asm
<fib_recur>:
  endbr64
  test   %edi,%edi
  je     L104
  mov    %edi,%eax
  cmp    $0x1,%edi
  je     L267
  push   %r15
  sub    $0x2,%eax
  xor    %r8d,%r8d
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x58,%rsp
  mov    %eax,0x18(%rsp)
  mov    %r8,0x20(%rsp)
L159:
  mov    0x18(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L531
  cmp    $0x1,%eax
  je     L3
  lea    -0x1(%rdi),%eax
  xor    %ecx,%ecx
  mov    %eax,0x14(%rsp)
  mov    %rcx,0x28(%rsp)
L372:
  mov    0x14(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L164
  cmp    $0x1,%eax
  je     L377
  lea    -0x1(%rdi),%eax
  xor    %edx,%edx
  mov    %eax,0x1c(%rsp)
  mov    %rdx,0x30(%rsp)
L269:
  mov    0x1c(%rsp),%edi
  mov    %edi,%eax
  add    $0x1,%eax
  je     L82
  cmp    $0x1,%eax
  je     L431
  xor    %edx,%edx
  lea    -0x1(%rdi),%esi
  mov    %rdx,0x38(%rsp)
  mov    %esi,%edx
L447:
  mov    %edx,%eax
  add    $0x1,%eax
  je     L539
  cmp    $0x1,%eax
  je     L153
  xor    %ecx,%ecx
  mov    %edx,0x40(%rsp)
  lea    -0x1(%rdx),%r8d
  mov    %rcx,0x8(%rsp)
  mov    %r8d,%r15d
L302:
  mov    %r15d,%eax
  add    $0x1,%eax
  je     L381
  cmp    $0x1,%eax
  je     L213
  lea    -0x1(%r15),%r12d
  xor    %ecx,%ecx
  mov    %r15d,%esi
L474:
  mov    %r12d,%eax
  add    $0x1,%eax
  je     L350
  cmp    $0x1,%eax
  je     L232
  xor    %ebx,%ebx
  lea    -0x1(%r12),%ebp
  mov    %r12d,%edx
  mov    %rbx,%r12
L316:
  mov    %ebp,%eax
  add    $0x1,%eax
  je     L379
  cmp    $0x1,%eax
  je     L264
  mov    %ebp,%eax
  lea    -0x1(%rbp),%r15d
  xor    %r14d,%r14d
  mov    %rcx,%rbp
  mov    %eax,%ecx
L50:
  mov    %r15d,%ebx
  add    $0x1,%ebx
  je     L363
  cmp    $0x1,%ebx
  je     L496
  mov    %r15d,0x44(%rsp)
  xor    %r13d,%r13d
  mov    %esi,%r15d
L373:
  lea    -0x1(%rbx),%edi
  mov    %ecx,0x4c(%rsp)
  mov    %edx,0x48(%rsp)
  call   <fib_recur>
  mov    0x48(%rsp),%edx
  mov    0x4c(%rsp),%ecx
  add    %rax,%r13
  sub    $0x2,%ebx
  je     L395
  cmp    $0x1,%ebx
  jne    L373
  mov    %r15d,%esi
  mov    0x44(%rsp),%r15d
  mov    $0x1,%eax
L304:
  add    %rax,%r13
  add    %r13,%r14
  test   %r15d,%r15d
  je     L262
  cmp    $0x1,%r15d
  jne    L363
L496:
  mov    %ecx,%eax
  add    $0x1,%r14
  mov    %rbp,%rcx
  mov    %eax,%ebp
  add    %r14,%r12
  test   %ebp,%ebp
  je     L147
L361:
  cmp    $0x1,%ebp
  jne    L379
L264:
  mov    %r12,%rbx
  mov    %edx,%r12d
  add    $0x1,%rbx
L226:
  add    %rbx,%rcx
  test   %r12d,%r12d
  jne    L143
  mov    %esi,%r15d
  mov    %rcx,%r14
  add    %r14,0x8(%rsp)
  mov    0x8(%rsp),%rcx
  test   %r15d,%r15d
  jne    L106
L110:
  mov    0x40(%rsp),%edx
  add    %rcx,0x38(%rsp)
  test   %edx,%edx
  je     L70
L25:
  cmp    $0x1,%edx
  je     L153
L539:
  sub    $0x2,%edx
  jmp    L447
L379:
  sub    $0x2,%ebp
  jmp    L316
L143:
  cmp    $0x1,%r12d
  jne    L350
L232:
  mov    %rcx,%r14
  mov    %esi,%r15d
  add    $0x1,%r14
  add    %r14,0x8(%rsp)
  mov    0x8(%rsp),%rcx
  test   %r15d,%r15d
  je     L110
L106:
  cmp    $0x1,%r15d
  je     L213
L381:
  sub    $0x2,%r15d
  jmp    L302
L350:
  sub    $0x2,%r12d
  jmp    L474
L262:
  mov    %ecx,%eax
  mov    %rbp,%rcx
  add    %r14,%r12
  mov    %eax,%ebp
  test   %ebp,%ebp
  jne    L361
L147:
  mov    %r12,%rbx
  mov    %edx,%r12d
  jmp    L226
  nopw   0x0(%rax,%rax,1)
L395:
  mov    %r15d,%esi
  xor    %eax,%eax
  mov    0x44(%rsp),%r15d
  jmp    L304
L213:
  mov    0x8(%rsp),%rcx
  mov    0x40(%rsp),%edx
  add    $0x1,%rcx
  add    %rcx,0x38(%rsp)
  test   %edx,%edx
  jne    L25
L70:
  mov    0x1c(%rsp),%ecx
  mov    0x38(%rsp),%rdx
  add    %rdx,0x30(%rsp)
  test   %ecx,%ecx
  jne    L422
L111:
  mov    0x30(%rsp),%rdx
  add    %rdx,0x28(%rsp)
  mov    0x14(%rsp),%edx
  test   %edx,%edx
  jne    L184
L278:
  mov    0x28(%rsp),%rcx
  jmp    L177
  nopl   0x0(%rax)
L363:
  sub    $0x2,%r15d
  jmp    L50
L153:
  mov    0x38(%rsp),%rdx
  mov    0x1c(%rsp),%ecx
  add    $0x1,%rdx
  add    %rdx,0x30(%rsp)
  test   %ecx,%ecx
  je     L111
L422:
  cmpl   $0x1,0x1c(%rsp)
  je     L431
L82:
  subl   $0x2,0x1c(%rsp)
  jmp    L269
L431:
  mov    0x30(%rsp),%rdx
  add    $0x1,%rdx
  add    %rdx,0x28(%rsp)
  mov    0x14(%rsp),%edx
  test   %edx,%edx
  je     L278
L184:
  cmpl   $0x1,0x14(%rsp)
  je     L377
L164:
  subl   $0x2,0x14(%rsp)
  jmp    L372
L377:
  mov    0x28(%rsp),%rcx
  add    $0x1,%rcx
L177:
  mov    0x18(%rsp),%eax
  add    %rcx,0x20(%rsp)
  test   %eax,%eax
  je     L299
  cmpl   $0x1,0x18(%rsp)
  jne    L531
L3:
  mov    0x20(%rsp),%r8
  add    $0x1,%r8
L325:
  add    $0x58,%rsp
  mov    %r8,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L531:
  subl   $0x2,0x18(%rsp)
  jmp    L159
L104:
  xor    %r8d,%r8d
L509:
  mov    %r8,%rax
  ret
L267:
  mov    $0x1,%r8d
  jmp    L509
L299:
  mov    0x20(%rsp),%r8
  jmp    L325
```

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