[Bug target/114232] [14 regression] ICE when building rr-5.7.0 with LTO on x86

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114232

--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #19)
> (In reply to Jan Hubicka from comment #18)
> > But the problem here is more that optab initializations happens only at
> > the optimization_node changes and not if we switch from hot function to
> > cold?
> 
> I think solving optab init problem is a better solution than the target
> patch from comment #10. Using optimize_function_for_size_p in named pattern
> predicate would avoid using the non-optimal pattern also in cold functions,
> and would be preferrable to using optimize_size.

It would be very costly IMHO, because on every set_cfun we'd need to compute
optimize_function_for_size_p for both the old and new function and find out
where to attach the additional optab tables. set_cfun can be called millions of
times.