| Issue |
152506
|
| Summary |
[Headers][X86] Allow SSE2/AVX2/AVX512BW integer saturated arithmetic intrinsics to be used in constexpr
|
| Labels |
good first issue,
backend:X86,
clang:headers,
constexpr
|
| Assignees |
|
| Reporter |
RKSimon
|
All of these intrinsics wrap generic __builtin_elementwise_add_sat/sub_sat which can already be used in constexpr
```
_mm_adds_epi8 _mm_adds_epi16
_mm_subs_epi8 _mm_subs_epi16
_mm256_adds_epi8 _mm256_adds_epi16
_mm256_subs_epi8 _mm256_subs_epi16
_mm512_adds_epi8 _mm512_adds_epi16
_mm512_subs_epi8 _mm512_subs_epi16
```
(ignore the AVX512 mask/maskz variants for now)
You can use https://github.com/llvm/llvm-project/pull/152296 for reference - just make sure some of the constants actually saturate!
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