GCC 8 vs. GCC 9 speed and size comparison

[Jakub Jelinek]

On Mon, Apr 15, 2019 at 12:12:13PM +0000, Michael Matz wrote:
> 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 

Is that with the same libstdc++ headers (i.e. identical *.ii files) or with
the corresponding libstdc++ headers?  Those do change a lot every release as
well.

	Jakub