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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/98782] [11/12 Regression] Bad interaction
 between IPA frequences and IRA resulting in spills due to changes in BB
 frequencies
Date: Fri, 03 Dec 2021 11:47:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98782

--- Comment #10 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Thanks for looking into this. I was planning to try to contact Vladimir abo=
ut
the IRA behaviour here, but there was always something else to work with hi=
gher
priority.  I wonder if you could possibly attach the WIP patch?

Teaching inliner to not inline this function as called once is probably jus=
t a
matter of adding a limit capping loop depth. I think that is meaningful
heuristics since inlining very large function to large loop depth is probab=
ly
not a good idea. I have patch for testing.

Do you know of other benchmarks where -fno-inline-functions-called-once help
(and ideally know why?).  We plan to look into roms and tramp3d which also
regresses.=