> With the patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49452 > the regstate information is resetted at the unspec_volatile instead of > invalidated!
You're right. This wouldn't have happened if the code had been properly commented. > 2011-11-14 Andreas Krebbel <andreas.kreb...@de.ibm.com> > > * postreload.c (reload_combine): Mark reg_state as invalid at a > barrier if there has been a use already. Let's be conservative instead and distinguish the two cases: in the barrier case, we don't change anything and just add the missing comment, along the lines of "Crossing a barrier resets all the use information". In the volatile case, we unconditionally invalidate with a similar comment. -- Eric Botcazou
