Avoid masks when possible in AVX2 logic #104
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Initially I expected this be wrong because you would be writing incorrect data to the array with the unmasked stores. But then I realized they get overwritten by the right numbers in subsequent stores. You don't need the masked store at all any point of time (even for the last register).
Never mind, that was surprisingly horrible! |
r-devulap
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Nov 20, 2023
src/avx2-emu-funcs.hpp
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| typename vtype::reg_t temp = vtype::permutevar(reg, perm); | ||
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| vtype::mask_storeu(leftStore, left, temp); | ||
| vtype::mask_storeu(rightStore, _mm256_xor_si256(oxff, left), temp); | ||
| if constexpr (masked) { |
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Do we need the masked store? I think we can get away with just the regular store. Or am I wrong?
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Perf improvements to AVX2 sorting: see intel/x86-simd-sort#104
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Perf improvements to AVX2 sorting: see intel/x86-simd-sort#104
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This avoids using masked stores when unmasked stores can be used. This gives a reasonable performance improvement for AVX2 quicksort.