<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/105621>105621</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [omp] The implementation of gcc is significantly simpler than that of clang
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          vfdff
      </td>
    </tr>
</table>

<pre>
    * test: https://gcc.godbolt.org/z/j6rzrGddh
```
int foo_omp (char *argv[])
{
    int sum=20;
    int thrdCnt=strtol(argv[1],NULL,10);
    #pragma omp parallel num_threads(thrdCnt) reduction(+:sum)
    {
        int myRank=omp_get_thread_num();
        sum+=myRank;
    }
    return sum;
}
```

* The clang and llvm have different ways to implementation the feature **omp**, If I assume both of them are correct, then base on the final output assemble, we can see that the gcc's code is much more smart.
   > gcc: foo_omp(char**)--> foo_omp(char**) [clone ._omp_fn.0]
   > llvm: foo_omp(char**) --> foo_omp(char**) (.omp_outlined) --> foo_omp(char**) (.omp_outlined_debug__.omp.reduction.reduction_func)
</pre>
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