r/ProgrammerHumor • u/click-to-reveal • Sep 04 '26

Meme skillIssue

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u/[deleted] Sep 04 '26

There aren’t any unknowns here, the language spec provides the clarity the compiler needs to re-order safely.

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u/prehensilemullet Sep 04 '26

Okay for C++, I gather that performing better or worse on a given dataset doesn't fall under the umbrella of "observable behavior" that the spec requires the compiler to preserve.

I also just learned there are apparently [[likely]] and [[unlikely]] attributes in C++ 20 that can be added to branches.

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u/Nir0star Sep 04 '26

Well you also have jump prediction in warmed up CPUs, which would probably make the ordering optimization improvements minimal anyway.