https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69564
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
Assignee|jason at gcc dot gnu.org |unassigned at gcc dot
gnu.org
--- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #7)
> But if I add loop inversion back into the C++ front end
> so that the .optimized output is indistinguishable, that resolves the
> difference without LTO
Actually, no, the loop inversion patch in comment 8 doesn't improve
performance; even though the .optimized dump is the same between C and C++, the
C++ build is still slower by roughly the same amount. I guess the RTL
optimizers must be doing something different? Mysterious. Unassigning myself.
