user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<fib>:
  endbr64
  push   %r15
  lea    -0x2(%rdi),%r11d
  mov    %edi,%eax
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  movl   $0x0,0x8(%rsp)
  cmp    $0x1,%edi
  jle    L167
L166:
  movl   $0x0,0xc(%rsp)
  lea    -0x2(%r11),%r10d
  cmp    $0x1,%r11d
  jbe    L83
  mov    %r11d,0x14(%rsp)
  mov    %r10d,%r11d
L28:
  movl   $0x0,0x10(%rsp)
  lea    -0x2(%r11),%r10d
  cmp    $0x1,%r11d
  jbe    L107
  mov    %r11d,0x18(%rsp)
L43:
  lea    -0x2(%r10),%ecx
  xor    %r11d,%r11d
  cmp    $0x1,%r10d
  jbe    L18
L128:
  mov    %r10d,0x1c(%rsp)
L238:
  lea    -0x2(%rcx),%r13d
  xor    %r15d,%r15d
  cmp    $0x1,%ecx
  jbe    L70
L157:
  lea    -0x2(%r13),%ebx
  xor    %r12d,%r12d
  cmp    $0x1,%r13d
  jbe    L2
L55:
  mov    %ebx,%r8d
  cmp    $0x1,%ebx
  jbe    L102
L263:
  lea    -0x2(%rbx),%edx
  lea    -0x4(%rbx),%r9d
  xor    %esi,%esi
L273:
  mov    %edx,%eax
  mov    %r9d,%ebp
  xor    %r14d,%r14d
  cmp    $0x1,%edx
  jle    L123
L10:
  lea    -0x2(%rbp),%edi
  xor    %r10d,%r10d
  cmp    $0x1,%ebp
  jle    L235
  nopw   0x0(%rax,%rax,1)
L137:
  mov    %edx,0x3c(%rsp)
  mov    %r9d,0x38(%rsp)
  mov    %ecx,0x34(%rsp)
  mov    %r11d,0x30(%rsp)
  mov    %r10d,0x2c(%rsp)
  mov    %esi,0x28(%rsp)
  mov    %r8d,0x24(%rsp)
  mov    %edi,0x20(%rsp)
  call   <fib>
  mov    0x20(%rsp),%edi
  mov    0x2c(%rsp),%r10d
  mov    0x24(%rsp),%r8d
  mov    0x28(%rsp),%esi
  sub    $0x1,%edi
  add    %eax,%r10d
  mov    0x30(%rsp),%r11d
  mov    0x34(%rsp),%ecx
  cmp    $0xffffffff,%edi
  mov    0x38(%rsp),%r9d
  mov    0x3c(%rsp),%edx
  jne    L137
  sub    $0x1,%ebp
  lea    0x1(%r10,%r14,1),%r14d
  xor    %r10d,%r10d
  lea    -0x2(%rbp),%edi
  cmp    $0x1,%ebp
  jg     L137
L235:
  add    %ebp,%r14d
  sub    $0x1,%ebp
  jae    L10
  sub    %r8d,%r14d
  lea    0x3(%r14,%rdx,1),%eax
L123:
  sub    $0x1,%r8d
  add    %eax,%esi
  sub    $0x1,%edx
  sub    $0x1,%r9d
  cmp    $0x1,%r8d
  jne    L273
  sub    $0x1,%ebx
  lea    0x1(%rsi,%r12,1),%r12d
  mov    %ebx,%r8d
  cmp    $0x1,%ebx
  ja     L263
L102:
  add    %ebx,%r12d
  test   %ebx,%ebx
  jne    L132
  sub    $0x1,%r13d
  lea    0x1(%r15,%r12,1),%r15d
  xor    %r12d,%r12d
  lea    -0x2(%r13),%ebx
  cmp    $0x1,%r13d
  ja     L55
L2:
  add    %r13d,%r15d
  test   %r13d,%r13d
  jne    L141
  sub    $0x1,%ecx
  lea    0x1(%r11,%r15,1),%r11d
  xor    %r15d,%r15d
  lea    -0x2(%rcx),%r13d
  cmp    $0x1,%ecx
  ja     L157
L70:
  add    %ecx,%r11d
  test   %ecx,%ecx
  jne    L268
  mov    0x10(%rsp),%eax
  mov    0x1c(%rsp),%r10d
  lea    0x1(%rax,%r11,1),%eax
  sub    $0x1,%r10d
  xor    %r11d,%r11d
  mov    %eax,0x10(%rsp)
  lea    -0x2(%r10),%ecx
  cmp    $0x1,%r10d
  ja     L128
L18:
  add    %r10d,0x10(%rsp)
  test   %r10d,%r10d
  jne    L36
  mov    0xc(%rsp),%eax
  mov    0x10(%rsp),%edi
  mov    0x18(%rsp),%r11d
  lea    0x1(%rax,%rdi,1),%eax
  mov    %eax,0xc(%rsp)
  sub    $0x1,%r11d
  jmp    L28
L107:
  add    %r11d,0xc(%rsp)
  test   %r11d,%r11d
  jne    L33
  mov    0x8(%rsp),%eax
  mov    0xc(%rsp),%edi
  mov    0x14(%rsp),%r11d
  lea    0x1(%rax,%rdi,1),%eax
  mov    %eax,0x8(%rsp)
  sub    $0x1,%r11d
  jmp    L166
L83:
  add    %r11d,0x8(%rsp)
  test   %r11d,%r11d
  jne    L150
  mov    0x8(%rsp),%eax
  add    $0x1,%eax
L167:
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L132:
  xor    %ebx,%ebx
  jmp    L55
L150:
  xor    %r11d,%r11d
  jmp    L166
L33:
  xor    %r11d,%r11d
  jmp    L28
L36:
  xor    %r10d,%r10d
  jmp    L43
L268:
  xor    %ecx,%ecx
  jmp    L238
L141:
  xor    %r13d,%r13d
  jmp    L157
```

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