IIUC, the optimisation is the same, but all it does is tell the compiler what th... | Hacker News

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		secondcoming on April 7, 2021 \| parent \| context \| favorite \| on: All C++20 core language features with examples IIUC, the optimisation is the same, but all it does is tell the compiler what the hot path is likely to be and so the code won't 'jmp' to it; the instructions are likely to be in I-cache.

steerablesafe on April 7, 2021 [–]

gcc (maybe other compilers too) can put the cold path to a separate section, so it further improves happy-path code cache locality.

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