[Bug rtl-optimization/98782] [11/12 Regression] Bad interaction between IPA frequences and IRA resulting in spills due to changes in BB frequencies

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98782

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

Teaching inliner to not inline this function as called once is probably just 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 probably
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.