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From: "hubicka at ucw dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/114262] Over-inlining when optimizing for size with
 gnu_inline function
Date: Thu, 07 Mar 2024 15:55:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114262

--- Comment #6 from Jan Hubicka <hubicka at ucw dot cz> ---
> Note GCC has not retuned its -Os heurstics for a long time because it has=
 been
> decent enough for most folks and corner cases like this is almost never c=
ome
> up.
There were quite few changes to -Os heuristics :)
One of bigger challenges is that we do see more and more C++ code built
with -Os which relies on certain functions to be inlined and optimized
in context, so we had to get more optimistic in a hope that inlined code
will optimize well.

COMDAT functions are more likely inlined because statistics shows that
many of them are not really shared between translations units
(see -param=3Dcomdat-sharing-probability parameter). This was necessary to
get reasonable code for Firefox approx 15 years ago.=