Use AVX2 to accelerate strto{upper,lower} (only on 'AVX2-native' builds for now)#10493
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alexdowad wants to merge 1 commit into
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Use AVX2 to accelerate strto{upper,lower} (only on 'AVX2-native' builds for now)#10493alexdowad wants to merge 1 commit into
alexdowad wants to merge 1 commit into
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…ds for now) On short strings, there is no difference in performance. However, for strings around 10,000 bytes long, the AVX2-accelerated function is about 55% faster than the SSE2-accelerated one.
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It would be better if the 'AVX2 resolver' stuff was implemented as well... this is just a quick change which I coded up in a few minutes, which boosts performance for AVX2-only builds. |
ndossche
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Feb 3, 2023
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| #define BLOCKCONV_LOAD(input) \ | ||
| __m256i blconv_operand = _mm256_loadu_si256((__m256i*)(input)); \ | ||
| __m256i blconv_mask = _mm256_cmpgt_epi8(blconv_threshold, _mm256_add_epi8(blconv_operand, blconv_offset)); |
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Nit: Maybe this should be changed to lt instead of gt with the argument swapped in order to be symmetric with the SSE2 version.
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😄 There is no such thing as _mm256_cmplt_epi8. That's why I had to change to cmpgt and swap the arguments to get the code to compile.
Ref: https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm256_cmplt_epi8
If we want to make it symmetric, then we would need to change the SSE2 version.
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Thanks for reviewing! Just merging now. |
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On short strings, there is no difference in performance. However, for strings around 10,000 bytes long, the AVX2-accelerated function is about 55% faster than the SSE2-accelerated one.
FYA @cmb69 @Girgias @nikic @nielsdos