On Tue, Apr 3, 2012 at 1:30 PM, Nemanja Lukic <[email protected]> wrote: > From: Nemanja Lukic <[email protected]> > > Performance numbers before/after on MIPS-74kc @ 1GHz > > Referent (before): > > lowlevel-blt-bench: > over_n_8_8888 = L1: 10.71 L2: 10.11 M: 8.70 ( 34.57%) HT: 7.82 > VT: 7.77 R: 7.66 RT: 5.37 ( 41Kops/s) > over_n_8_0565 = L1: 8.24 L2: 8.04 M: 7.49 ( 19.84%) HT: 6.82 > VT: 6.75 R: 6.70 RT: 4.85 ( 40Kops/s) > cairo-perf-trace: > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.25.3 > [ 0] image swfdec-giant-steps 76.936 77.822 0.49% 6/6 > [ 1] image gnome-system-monitor 277.838 278.500 0.16% 6/6 > [ # ] image16: pixman 0.25.3 > [ 0] image16 swfdec-giant-steps 60.598 61.966 1.10% 6/6 > [ 1] image16 gnome-system-monitor 277.628 277.675 0.02% 6/6 > > Optimized: > > lowlevel-blt-bench: > over_n_8_8888 = L1: 18.38 L2: 17.29 M: 13.49 ( 53.58%) HT: 11.44 > VT: 11.31 R: 11.05 RT: 6.65 ( 47Kops/s) > over_n_8_0565 = L1: 12.42 L2: 11.86 M: 10.68 ( 28.28%) HT: 9.27 > VT: 9.16 R: 9.04 RT: 5.83 ( 44Kops/s) > cairo-perf-trace: > [ # ] backend test min(s) median(s) stddev. count > [ # ] image: pixman 0.25.3 > [ 0] image swfdec-giant-steps 71.430 71.593 0.18% 6/6 > [ 1] image gnome-system-monitor 253.903 254.007 0.02% 6/6 > [ # ] image16: pixman 0.25.3 > [ 0] image16 swfdec-giant-steps 58.791 59.358 0.62% 6/6 > [ 1] image16 gnome-system-monitor 253.713 253.863 0.03% 6/6 > ---
The performance increase seems a lot smaller than I'd have expected (my Lemote optimized code is 40% faster in over_n_8_0565 and 60% faster over_n_8_8888). By skipping pixels when src == 0xff, mask == 0xff, or mask == 0x00 you should gain quite a bit of performance. It looks like your code already does this though, so I'm not sure. _______________________________________________ Pixman mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/pixman
