user: 请从给定的汇编指令推导出C源代码:

```asm
<fib>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %edi,0x3c(%rsp)
  mov    %edi,0x4(%rsp)
  movl   $0x0,0x2c(%rsp)
  cmp    $0x1,%edi
  jle    L23
L101:
  mov    0x4(%rsp),%eax
  movl   $0x0,0x30(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x8(%rsp)
  cmp    $0x1,%eax
  je     L67
L118:
  mov    0x8(%rsp),%eax
  movl   $0x0,0x34(%rsp)
  sub    $0x1,%eax
  mov    %eax,0xc(%rsp)
  cmp    $0x1,%eax
  je     L104
L226:
  mov    0xc(%rsp),%eax
  movl   $0x0,0x38(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x10(%rsp)
  cmp    $0x1,%eax
  je     L117
L176:
  mov    0x10(%rsp),%eax
  movl   $0x0,0x14(%rsp)
  sub    $0x1,%eax
  mov    %eax,%ebx
  cmp    $0x1,%eax
  je     L34
L240:
  lea    -0x1(%rbx),%ecx
  xor    %r14d,%r14d
  cmp    $0x1,%ecx
  je     L121
  mov    %ebx,0x1c(%rsp)
  mov    %ecx,%ebx
L135:
  cmp    $0x2,%ebx
  je     L153
  lea    -0x3(%rbx),%eax
  lea    -0x6(%rbx),%edx
  mov    %r14d,0x20(%rsp)
  xor    %ebp,%ebp
  mov    %eax,0x18(%rsp)
  and    $0xfffffffe,%eax
  lea    -0x4(%rbx),%r12d
  sub    %eax,%edx
  mov    %edx,0x24(%rsp)
L115:
  lea    0x2(%r12),%r14d
  xor    %r13d,%r13d
  cmp    $0xffffffff,%r12d
  je     L202
  mov    %ebx,0x28(%rsp)
  mov    %r13d,%ebx
L249:
  lea    -0x1(%r14),%r15d
  xor    %r13d,%r13d
  cmp    $0x1,%r15d
  je     L54
L88:
  lea    -0x1(%r15),%edi
  sub    $0x2,%r15d
  call   <fib>
  add    %eax,%r13d
  cmp    $0x1,%r15d
  jg     L88
  lea    -0x3(%r14),%edi
  and    $0x1,%edi
L227:
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  sub    $0x2,%r14d
  call   <myMax@plt>
  add    %r13d,%eax
  add    %eax,%ebx
  cmp    $0x1,%r14d
  jg     L249
  mov    %ebx,%r13d
  mov    %r12d,%r14d
  mov    0x28(%rsp),%ebx
  and    $0x1,%r14d
L202:
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  mov    %r14d,%edi
  sub    $0x2,%r12d
  call   <myMax@plt>
  add    %r13d,%eax
  add    %eax,%ebp
  cmp    0x24(%rsp),%r12d
  jne    L115
  mov    0x18(%rsp),%edi
  mov    0x20(%rsp),%r14d
  and    $0x1,%edi
L4:
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  sub    $0x2,%ebx
  call   <myMax@plt>
  add    %ebp,%eax
  add    %eax,%r14d
  cmp    $0x1,%ebx
  jg     L135
  mov    0x1c(%rsp),%ebx
  lea    -0x3(%rbx),%edi
  and    $0x1,%edi
L233:
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  sub    $0x2,%ebx
  call   <myMax@plt>
  add    %r14d,%eax
  add    %eax,0x14(%rsp)
  cmp    $0x1,%ebx
  jg     L240
  mov    0x10(%rsp),%eax
  lea    -0x3(%rax),%edi
  and    $0x1,%edi
L36:
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  call   <myMax@plt>
  subl   $0x2,0x10(%rsp)
  mov    0x10(%rsp),%ecx
  add    0x14(%rsp),%eax
  add    %eax,0x38(%rsp)
  cmp    $0x1,%ecx
  jg     L176
  mov    0xc(%rsp),%eax
  lea    -0x3(%rax),%edi
  and    $0x1,%edi
L139:
  xor    %esi,%esi
  mov    $0xffffffff,%edx
  call   <myMax@plt>
  subl   $0x2,0xc(%rsp)
  mov    0xc(%rsp),%esi
  add    0x38(%rsp),%eax
  add    %eax,0x34(%rsp)
  cmp    $0x1,%esi
  jg     L226
  mov    0x8(%rsp),%eax
  lea    -0x3(%rax),%edi
  and    $0x1,%edi
L46:
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  call   <myMax@plt>
  subl   $0x2,0x8(%rsp)
  mov    0x8(%rsp),%ecx
  add    0x34(%rsp),%eax
  add    %eax,0x30(%rsp)
  cmp    $0x1,%ecx
  jg     L118
  mov    0x4(%rsp),%eax
  lea    -0x3(%rax),%edi
  and    $0x1,%edi
L98:
  xor    %esi,%esi
  mov    $0xffffffff,%edx
  call   <myMax@plt>
  subl   $0x2,0x4(%rsp)
  mov    0x4(%rsp),%esi
  add    0x30(%rsp),%eax
  add    %eax,0x2c(%rsp)
  cmp    $0x1,%esi
  jg     L101
  andl   $0x1,0x3c(%rsp)
L23:
  mov    0x3c(%rsp),%edi
  mov    $0xffffffff,%edx
  xor    %esi,%esi
  call   <myMax@plt>
  add    0x2c(%rsp),%eax
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L153:
  xor    %ebp,%ebp
  mov    $0x1,%edi
  jmp    L4
  nopw   0x0(%rax,%rax,1)
L54:
  mov    $0x1,%edi
  jmp    L227
L121:
  mov    $0x1,%edi
  jmp    L233
L34:
  mov    $0x1,%edi
  jmp    L36
L117:
  mov    $0x1,%edi
  jmp    L139
L104:
  mov    $0x1,%edi
  jmp    L46
L67:
  mov    $0x1,%edi
  jmp    L98
```

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