<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/152490>152490</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Headers][X86] Allow SSE2/AVX2/AVX512F/AVX512BW/AVX512DQ integer arithmetic intrinsics to be used in constexpr
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    All of these intrinsics wrap generic implementations which can already be used in constexpr
```
_mm_add_epi8 _mm_add_epi16 _mm_add_epi32 _mm_add_epi64
_mm_sub_epi8 _mm_sub_epi16 _mm_sub_epi32 _mm_sub_epi64
_mm_mullo_epi16 _mm_mullo_epi32

_mm256_add_epi8 _mm256_add_epi16 _mm256_add_epi32 _mm256_add_epi64
_mm256_sub_epi8 _mm256_sub_epi16 _mm256_sub_epi32 _mm256_sub_epi64
_mm256_mullo_epi16 _mm256_mullo_epi32

_mm512_add_epi8 _mm512_add_epi16 _mm512_add_epi32 _mm512_add_epi64
_mm512_sub_epi8 _mm512_sub_epi16 _mm512_sub_epi32 _mm512_sub_epi64
_mm512_mullo_epi16 _mm512_mullo_epi32
_mm_mullo_epi64 _mm256_mullo_epi64 _mm512_mullo_epi64
```
(ignore the AVX512 mask/maskz variants for now)

You can use https://github.com/llvm/llvm-project/pull/152296 for reference
</pre>
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