Split off from https://github.com/llvm/llvm-project/issues/152490 ``` _mm_cmpeq_epi8 _mm_cmpeq_epi16 _mm_cmpeq_epi32 _mm_cmpeq_epi64 _mm_cmpgt_epi8 _mm_cmpgt_epi16 _mm_cmpgt_epi32 _mm_cmpgt_epi64 _mm_cmplt_epi8 _mm_cmplt_epi16 _mm_cmplt_epi32 _mm_cmplt_epi64 _mm256_cmpeq_epi8 _mm256_cmpeq_epi16 _mm256_cmpeq_epi32 _mm256_cmpeq_epi64 _mm256_cmpgt_epi8 _mm256_cmpgt_epi16 _mm256_cmpgt_epi32 _mm256_cmpgt_epi64 ``` The pre-AVX512 integer comparison intrinsics are all safe to be used in constexpr - use #152296 for reference