Hi, On Mon, 15 Apr 2019, Martin Liška wrote:
> There's a similar comparison that I did for the official openSUSE gcc > packages. gcc8 is built with PGO, while the gcc9 package is built in 2 > different configurations: PGO, LTO, PGO+LTO (LTO used for FE in stage4, > for generators in stage3 as well). > > Please take a look at attached statistics. It seems the C++ parser got quite a bit slower with gcc 9 :-( Most visible in the compile time for tramp-3d (24%) and kdecore.cc (18% slower with just PGO); it seems that the other .ii files are C-like enough to not trigger this behaviour, so it's probably something to do with templates and/or classes. Ciao, Michael.
