In this pull request[1] I add GCC/Clang’s “__attribute__((hot))” to various hot GC functions. This increases code size a small amount, and makes a very small improvement in performance—see the attached graph. I think actually marking some slow-path/error-handling functions as “__attribute__((cold))” would do more to improve branch prediction in cases where we haven’t marked things as “G_UNLIKELY”.
[1]: https://github.com/mono/mono/pull/1501
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