[Bug tree-optimization/116126] vectorize libcpp search_line_fast
uis9936 at gmail dot com via Gcc-bugs <[email protected]>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116126
uis <uis9936 at gmail dot com> changed:
What |Removed |Added
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--- Comment #12 from uis <uis9936 at gmail dot com> ---
Some vector instruction sets have non-immediate permutation instructions, so
there are better alternatives to multiple comparisons to scalars or vectors
full of scalars.
https://lemire.me/blog/2024/07/20/scan-html-even-faster-with-simd-instructions-c-and-c/
It looks like SIMD hash table. Usually shift right is good enough.