user: 请从给定的汇编指令推导出C源代码:

```asm
<_ackermann>:
  endbr64
  test   %rdi,%rdi
  je     L184
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
L50:
  lea    -0x1(%rdi),%rax
  mov    %rax,0x18(%rsp)
  test   %rsi,%rsi
  jne    L317
  cmpq   $0x0,0x18(%rsp)
  je     L207
L197:
  mov    0x18(%rsp),%rax
L418:
  lea    -0x1(%rax),%rcx
  mov    %rcx,0x10(%rsp)
  test   %rsi,%rsi
  jne    L0
  cmpq   $0x0,0x10(%rsp)
  je     L176
L84:
  mov    0x10(%rsp),%rax
L16:
  lea    -0x1(%rax),%r14
  test   %rsi,%rsi
  jne    L125
  test   %r14,%r14
  je     L335
L316:
  mov    %r14,%rax
L319:
  lea    -0x1(%rax),%r13
  test   %rsi,%rsi
  jne    L253
  test   %r13,%r13
  je     L143
L132:
  mov    %r13,%rax
L167:
  lea    -0x1(%rax),%rdx
  test   %rsi,%rsi
  jne    L49
  test   %rdx,%rdx
  je     L146
L409:
  mov    %rdx,%rax
L382:
  lea    -0x1(%rax),%r15
  test   %rsi,%rsi
  jne    L130
  test   %r15,%r15
  je     L119
L55:
  mov    %r15,%rax
L85:
  lea    -0x1(%rax),%r12
  test   %rsi,%rsi
  jne    L364
  test   %r12,%r12
  je     L323
L308:
  mov    %r12,%rax
L200:
  lea    -0x1(%rax),%rbp
  test   %rsi,%rsi
  jne    L75
  test   %rbp,%rbp
  je     L305
L228:
  mov    %rbp,%rax
L175:
  lea    -0x1(%rax),%rbx
  test   %rsi,%rsi
  jne    L357
  test   %rbx,%rbx
  je     L243
L368:
  mov    %rbx,%rdi
  mov    %rdx,0x8(%rsp)
  call   <_ackermann>
  mov    0x8(%rsp),%rdx
  mov    %rax,%rsi
  mov    %rbx,%rax
  sub    $0x1,%rax
  jne    L175
  add    $0x1,%rsi
L144:
  mov    %rbp,%rax
  sub    $0x1,%rax
  jne    L200
  add    $0x1,%rsi
L327:
  mov    %r12,%rax
  sub    $0x1,%rax
  jne    L85
  add    $0x1,%rsi
L214:
  mov    %r15,%rax
  sub    $0x1,%rax
  jne    L382
  add    $0x1,%rsi
L153:
  mov    %rdx,%rax
  sub    $0x1,%rax
  jne    L167
  add    $0x1,%rsi
L365:
  mov    %r13,%rax
  sub    $0x1,%rax
  jne    L319
  add    $0x1,%rsi
L64:
  mov    %r14,%rax
  sub    $0x1,%rax
  jne    L16
  add    $0x1,%rsi
L7:
  mov    0x10(%rsp),%rax
  sub    $0x1,%rax
  jne    L418
  add    $0x1,%rsi
L367:
  mov    0x18(%rsp),%rdi
  sub    $0x1,%rdi
  jne    L50
  add    $0x28,%rsp
  lea    0x1(%rsi),%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L243:
  mov    $0x2,%esi
  jmp    L144
  nopw   0x0(%rax,%rax,1)
L305:
  mov    $0x2,%esi
  jmp    L327
  nopw   0x0(%rax,%rax,1)
L323:
  mov    $0x2,%esi
  jmp    L214
  nopw   0x0(%rax,%rax,1)
L119:
  mov    $0x2,%esi
  jmp    L153
  nopw   0x0(%rax,%rax,1)
L146:
  mov    $0x2,%esi
  jmp    L365
  nopw   0x0(%rax,%rax,1)
L143:
  mov    $0x2,%esi
  jmp    L64
  nopw   0x0(%rax,%rax,1)
L335:
  mov    $0x2,%esi
  jmp    L7
  nopw   0x0(%rax,%rax,1)
L357:
  sub    $0x1,%rsi
  mov    %rax,%rbx
  jmp    L368
  nopl   0x0(%rax)
L176:
  mov    $0x2,%esi
  jmp    L367
  nopw   0x0(%rax,%rax,1)
L75:
  sub    $0x1,%rsi
  mov    %rax,%rbp
  jmp    L228
  nopl   0x0(%rax)
L207:
  add    $0x28,%rsp
  mov    $0x2,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L364:
  sub    $0x1,%rsi
  mov    %rax,%r12
  jmp    L308
  nopl   0x0(%rax)
L130:
  sub    $0x1,%rsi
  mov    %rax,%r15
  jmp    L55
  nopl   0x0(%rax)
L49:
  sub    $0x1,%rsi
  mov    %rax,%rdx
  jmp    L409
  nopl   0x0(%rax)
L253:
  sub    $0x1,%rsi
  mov    %rax,%r13
  jmp    L132
  nopl   0x0(%rax)
L125:
  sub    $0x1,%rsi
  mov    %rax,%r14
  jmp    L316
  nopl   0x0(%rax)
L184:
  lea    0x1(%rsi),%rax
  ret
  nopl   (%rax)
L0:
  mov    %rax,0x10(%rsp)
  sub    $0x1,%rsi
  jmp    L84
  cs nopw 0x0(%rax,%rax,1)
L317:
  mov    %rdi,0x18(%rsp)
  sub    $0x1,%rsi
  jmp    L197
```

assistant: ```c
long _ackermann(long EV_m, long EV_n) {
  if ((EV_m == 0)) {
    return (EV_n + 1);
  }
  if ((EV_n == 0)) {
    return _ackermann((EV_m - 1), 1);
  } else {
    return _ackermann((EV_m - 1), _ackermann(EV_m, (EV_n - 1)));
  }
}
```