On Tue, 2010-03-16 at 09:49 +0200, Siarhei Siamashka wrote: > On Monday 15 March 2010, Alexander Larsson wrote: > > On Mon, 2010-03-15 at 17:05 +0200, Siarhei Siamashka wrote: > > > Really good performance improvements for bilinear scaling are > going to > > > come > > > from SIMD optimizations. To make it happen, scaler core needs to > be > > > isolated > > > into a small simple function with a minimal number of checks and > > > branches. > > > > > http://cgit.freedesktop.org/~alexl/pixman/commit/?h=fast-bilinear&id=a > 79daa > >8453560b4193b848e51b4942dcdcd74c8d > > > > The "/* Main columns: */" part there is probably a good start for > that. > > Yes, I know :) Just a switch on different repeat cases needs to be > eliminated > and it should become quite easy to vectorize. Removal of this switch > may also > improve performance of generic C code a bit more.
Switch? The main (i.e. non-border) pixels have straight linear code: http://cgit.freedesktop.org/~alexl/pixman/tree/pixman/pixman-fast-path.c?h=fast-bilinear#n1854 There is no switch (or other repeat handling) in there, because we're using FAST_PATH_SAMPLES_COVERS_CLIP. -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Alexander Larsson Red Hat, Inc [email protected] [email protected] He's a globe-trotting amnesiac astronaut who hangs with the wrong crowd. She's a hard-bitten mutant advertising executive with an evil twin sister. They fight crime! _______________________________________________ Pixman mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/pixman
