[Mono-dev] Re. PR 1501: Mark hot functions in the runtime.

Jonathan Purdy jonathan.purdy at xamarin.com
Tue Jan 27 01:45:08 UTC 2015

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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