[Bug rtl-optimization/97295] ICE on firefox built with lto+pgo: dist/include/mozilla/Casting.h:64:1: internal compiler error: in to_frequency, at profile-count.c:273

[slyfox at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97295

--- Comment #1 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Created attachment 49309
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49309&action=edit
ICE-testcase-gcc-10.2.0.tar.gz

ICE-testcase-gcc-10.2.0.tar.gz contains two object files that seems to be
enough to feed into gcc-10.2.0 to get IRA crash. Unfortunately it's not a
source-based example. Is it useful to get the idea where ira goes wrong?

I hope it's a simple(ish) bug in not traversing some subset of CFG.