user: 请从给定的汇编指令推导出C源代码：

```asm
<test_safelen>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  movl   $0x0,-0x4(%rbp)
  jmp    L106
L9:
  addl   $0x1,-0x4(%rbp)
L106:
  cmpl   $0xf,-0x4(%rbp)
  jle    L9
  movl   $0x0,-0x4(%rbp)
  jmp    L29
L354:
  addl   $0x1,-0x4(%rbp)
L29:
  cmpl   $0xf,-0x4(%rbp)
  jle    L354
  movl   $0x0,-0x4(%rbp)
  jmp    L307
L321:
  addl   $0x1,-0x4(%rbp)
L307:
  cmpl   $0xf,-0x4(%rbp)
  jle    L321
  movl   $0x0,-0x4(%rbp)
  jmp    L83
L10:
  addl   $0x1,-0x4(%rbp)
L83:
  cmpl   $0xf,-0x4(%rbp)
  jle    L10
  movl   $0x0,-0x4(%rbp)
  jmp    L334
L24:
  addl   $0x1,-0x4(%rbp)
L334:
  cmpl   $0xf,-0x4(%rbp)
  jle    L24
  movl   $0x0,-0x4(%rbp)
  jmp    L137
L186:
  addl   $0x1,-0x4(%rbp)
L137:
  cmpl   $0xf,-0x4(%rbp)
  jle    L186
  movl   $0x0,-0x4(%rbp)
  jmp    L1
L252:
  addl   $0x1,-0x4(%rbp)
L1:
  cmpl   $0xf,-0x4(%rbp)
  jle    L252
  movl   $0x0,-0x4(%rbp)
  jmp    L5
L22:
  addl   $0x1,-0x4(%rbp)
L5:
  cmpl   $0xf,-0x4(%rbp)
  jle    L22
  movl   $0x0,-0x4(%rbp)
  jmp    L266
L324:
  addl   $0x1,-0x4(%rbp)
L266:
  cmpl   $0xf,-0x4(%rbp)
  jle    L324
  movl   $0x0,-0x4(%rbp)
  jmp    L90
L173:
  addl   $0x1,-0x4(%rbp)
L90:
  cmpl   $0xf,-0x4(%rbp)
  jle    L173
  movl   $0x0,-0x4(%rbp)
  jmp    L136
L376:
  addl   $0x1,-0x4(%rbp)
L136:
  cmpl   $0xf,-0x4(%rbp)
  jle    L376
  movl   $0x0,-0x4(%rbp)
  jmp    L318
L281:
  addl   $0x1,-0x4(%rbp)
L318:
  cmpl   $0xf,-0x4(%rbp)
  jle    L281
  movl   $0x0,-0x4(%rbp)
  jmp    L33
L53:
  addl   $0x1,-0x4(%rbp)
L33:
  cmpl   $0xf,-0x4(%rbp)
  jle    L53
  movl   $0x0,-0x4(%rbp)
  jmp    L69
L209:
  addl   $0x1,-0x4(%rbp)
L69:
  cmpl   $0xf,-0x4(%rbp)
  jle    L209
  movl   $0x0,-0x4(%rbp)
  jmp    L296
L66:
  addl   $0x1,-0x4(%rbp)
L296:
  cmpl   $0xf,-0x4(%rbp)
  jle    L66
  movl   $0x0,-0x4(%rbp)
  jmp    L357
L187:
  addl   $0x1,-0x4(%rbp)
L357:
  cmpl   $0xf,-0x4(%rbp)
  jle    L187
  movl   $0x0,-0x4(%rbp)
  jmp    L271
L263:
  addl   $0x1,-0x4(%rbp)
L271:
  cmpl   $0xf,-0x4(%rbp)
  jle    L263
  movl   $0x0,-0x4(%rbp)
  jmp    L157
L133:
  addl   $0x1,-0x4(%rbp)
L157:
  cmpl   $0xf,-0x4(%rbp)
  jle    L133
  movl   $0x0,-0x4(%rbp)
  jmp    L55
L71:
  addl   $0x1,-0x4(%rbp)
L55:
  cmpl   $0xf,-0x4(%rbp)
  jle    L71
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void test_safelen() {
  int i;
#pragma omp simd safelen
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen()
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(,
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(, )
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen 4)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4,
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4, )
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4 4)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4, , 4)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(4, 8)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(2.5)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(foo())
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(-5)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(0)
  for (i = 0; i < 16; ++i)
    ;
#pragma omp simd safelen(5 - 5)
  for (i = 0; i < 16; ++i)
    ;
}
```