> On 06/30/2010 02:26 PM, Basile Starynkevitch wrote: >> On Wed, 2010-06-30 at 14:23 -0700, Taras Glek wrote: >> >>> I tried 4.5 -O2 and it's actually faster than 4.3 -Os. >>> >>> I am happy that -O2 performance is actually pretty good, but -Os >>> regression is going to hurt on mobile. >>> >> Did you try gcc-4.5 -flto -Os or gcc-4.5 -flto -O2? >> >> It would be interesting to hear that GCC is able to LTO a program as big >> as Mozilla! And figures (notably RAM, CPU time, wallclock time for >> build) would be interesting. >> > > Both whopr and flto cause gcc to segfault while building Mozilla.
4.5 WHOPR is completely broken. LTO is in better shape but I am not sure if we can resonably expect it to build mozilla. However I would be very happy to help getting WHOPR working for 4.6. If you can find actual simple examples where -Os is losing size and speed we can try to do something about them. Honza > > > Taras
