On 2017.11.05 at 11:55 +0100, Jan Hubicka wrote: > > On 2017.11.03 at 16:48 +0100, Jan Hubicka wrote: > > > this is updated patch which I have comitted after profiledbootstrapping > > > x86-64 > > > > Unfortunately, compiling tramp3d-v4.cpp is 6-7% slower after this patch. > > This happens with an LTO/PGO bootstrapped gcc using > > --enable-checking=release. > > our periodic testers has also picked up the change and there is no compile > time > regression reported for tramp3d. > https://gcc.opensuse.org/gcc-old/c++bench-czerny/tramp3d/ > so I would conclude that it is regression in LTO+PGO bootstrap. I am fixing > one checking > bug that may cause it (where we mix local and global profiles) so perhaps it > will go away > afterwards.
Just to confirm: pure PGO bootstrap is fine, e.g. on Ryzen: (LTO/PGO) 17.65 sec ( +- 0.68% ) (PGO) 15.74 sec ( +- 0.27% ) -- Markus
