The GCC wiki says: "GCC uses execution profiles consisting of basic block and edge frequency counts to guide optimizations such as instruction scheduling, basic block reordering, function splitting, and register allocation."
More info here: https://gcc.gnu.org/wiki/AutoFDO/Tutorial Timur On Friday, 14 February 2020, Marek Olšák wrote: > Yeah I guess it reduces instruction cache misses, but then other codepaths > are likely to get more misses. > > Does it do anything smarter? > > Marek > > On Thu., Feb. 13, 2020, 17:52 Dave Airlie, <airl...@gmail.com> wrote: > > > On Fri, 14 Feb 2020 at 08:22, Marek Olšák <mar...@gmail.com> wrote: > > > > > > I wonder what PGO really does other than placing likely/unlikely. > > > > With LTO it can do a lot more, like grouping hot functions into closer > > regions so they avoid TLB misses and faults etc. > > > > Dave. > > > -- Sent from my Sailfish device _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
