https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104371
--- Comment #2 from Gabriel Ravier <gabravier at gmail dot com> --- Although I agree the pattern doesn't seem that useful at first, I've seen it crop up in several places, such as: - in pixman: https://github.com/servo/pixman/blob/master/pixman/pixman-sse2.c on line 181 - in an simd mandelbrot implementation: https://github.com/huonw/mandel-simd/blob/master/mandel_sse2.c on line 47 - in this article: http://0x80.pl/notesen/2021-02-02-all-bytes-in-reg-are-equal.html - in boost::uuid (although this one will detect if compiling on a platform with SSE4.1): https://github.com/boostorg/uuid/blob/develop/include/boost/uuid/detail/uuid_x86.ipp - in this other article: https://mischasan.wordpress.com/2011/11/09/the-generic-sse2-loop/ - in a research paper's accompanying github repo: https://github.com/GameTechDev/MaskedOcclusionCulling/blob/master/MaskedOcclusionCulling.cpp on line 333 - in ClickHouse: https://clickhouse.com/codebrowser/html_report/ClickHouse/src/Common/memcmpSmall.h.html on line 241 And this is just what I found in a few minutes, so I would personally think there are many more occurences of that pattern.
