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From: "lh_mouse at 126 dot com" <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 17:08:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114262

--- Comment #7 from LIU Hao <lh_mouse at 126 dot com> ---
(In reply to Jan Hubicka from comment #6)
> > Note GCC has not retuned its -Os heurstics for a long time because it h=
as been
> > decent enough for most folks and corner cases like this is almost never=
 come
> > 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.
>=20
> 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.

So is there no way to get the C99 extern inline behavior? i.e. sibling call=
s to
gnu_inline functions are inlined even when optimizing for size.=