https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80155
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Can you benchmark the 2nd candidate (most appropriate at this stage I think, would also fix 77498). It will cause pessimizations for code that benefits from predictive commoning transforms that PRE can do at -O2 because predictive commoning doesn't run at -O2. The fix for that would be to run predictive commoning at -O2 but in a mode that doesn't perform unrolling for example. [even pcom can blow through register pressure limits though] Any other approach to fixing this particular bug cannot be done for GCC 7 (even this one is quite late ...). So in the end I'd vote for WONTFIX for GCC 7.