I have a similar performance result got about one month ago. Gvim test has great performance increase, about 360%. Other tests has no side effect and no increase neither.
I tested it on 32-bit userland. I will test it again based on the git code and give out the data later. Regards, Xinyun On Fri, Dec 03, 2010 at 12:00:22AM +0800, Siarhei Siamashka wrote: > Just did some benchmarks with the 'gnome-system-monitor' cairo perf trace > which happens to use 'src_x888_8888' operation. It looks like SSSE3 has > about the same performance as SSE2, providing no measurable benefits on > this use case. The low complexity of this operation and the hardware > prefetcher make any differences between implementations much less > noticeable in general. > > Intel Atom N450, 64-bit userland, gcc 4.5.1 > > $ CAIRO_TEST_TARGET=image ./cairo-perf-trace gnome-system-monitor.trace > > ======= C slow path ========= > > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.21.3 > [ 0] image gnome-system-monitor 15.011 15.034 0.08% 6/6 > > ======= C fast path [1] ========= > > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.21.3 > [ 0] image gnome-system-monitor 14.659 14.697 0.20% 6/6 > > ======= SSE2 fast path [2] ===== > > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.21.3 > [ 0] image gnome-system-monitor 14.431 14.496 0.19% 6/6 > > ======= SSSE3 fast path [3] ====== > > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.21.3 > [ 0] image gnome-system-monitor 14.455 14.496 0.17% 6/6 > > ====== artificial test with just an empty stub for src_x888_8888 ======== > > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.21.3 > [ 0] image gnome-system-monitor 12.215 12.241 0.11% 6/6 > > --- > > So I'm not sure if this SSE3 code is very useful as is. But of course, if some > practical use case makes a heavy use of this function so that it works on the > data residing in L1/L2 caches, then it could show a big improvement. > > > 1. http://cgit.freedesktop.org/pixman/commit/?id=16bae834 > 2. http://cgit.freedesktop.org/pixman/commit/?id=e0b430a1 > 3. http://lists.freedesktop.org/archives/pixman/2010-November/000742.html > > -- > Best regards, > Siarhei Siamashka _______________________________________________ Pixman mailing list Pixman@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/pixman
