[issue28618] Decorate hot functions using __attribute__((hot)) to optimize Python

[STINNER Victor]

STINNER Victor added the comment:

Antoine Pitrou added the comment:
> Can you compare against a PGO build?

Do you mean comparison between current Python with PGO and patched
Python without PGO?

The hot attribute is ignored by GCC when PGO compilation is used.

> Ubuntu 14.04 is old, and I don't think this is something we should worry about.

Well, it's a practical issue for me to run benchmarks for speed.python.org.

Moreover, I like the idea of getting a fast(er) Python even when no
advanced optimization techniques like LTO or PGO is used. At least,
it's common to build quickly Python using "./configure && make" for a
quick benchmark.

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<http://bugs.python.org/issue28618>
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