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This really, really helps on platforms where fabs() isn't free. A great many shaders use a * frsq(fabs(fdot(a, a))) to normalize a vector. Since the result of the fdot must be non-negative, the fabs can be eliminated by an existing algebraic rule. shader-db results: r300 (run on R420 - X800XL) total instructions in shared programs: 1369807 -> 1368550 (-0.09%) instructions in affected programs: 59986 -> 58729 (-2.10%) helped: 609 HURT: 0 total vinst in shared programs: 512899 -> 512861 (<.01%) vinst in affected programs: 1522 -> 1484 (-2.50%) helped: 36 HURT: 0 total sinst in shared programs: 260690 -> 260570 (-0.05%) sinst in affected programs: 1419 -> 1299 (-8.46%) helped: 120 HURT: 0 total consts in shared programs: 957295 -> 957230 (<.01%) consts in affected programs: 849 -> 784 (-7.66%) helped: 65 HURT: 0 LOST: 0 GAINED: 3 The 3 gained shaders are all vertex shaders from XCom: Enemy Unknown. I'm guessing that game is never going to run on my X800XL. :) i915 total instructions in shared programs: 791121 -> 780843 (-1.30%) instructions in affected programs: 220170 -> 209892 (-4.67%) helped: 2085 HURT: 0 total temps in shared programs: 47765 -> 47766 (<.01%) temps in affected programs: 9 -> 10 (11.11%) helped: 0 HURT: 1 total const in shared programs: 93048 -> 92983 (-0.07%) const in affected programs: 784 -> 719 (-8.29%) helped: 65 HURT: 0 LOST: 0 GAINED: 36 Haswell, Ivy Bridge, and Sandy Bridge had similar results. (Haswell shown) total instructions in shared programs: 16702250 -> 16697908 (-0.03%) instructions in affected programs: 119277 -> 114935 (-3.64%) helped: 1065 HURT: 0 helped stats (abs) min: 1 max: 20 x̄: 4.08 x̃: 4 helped stats (rel) min: 0.48% max: 10.17% x̄: 3.66% x̃: 3.94% 95% mean confidence interval for instructions value: -4.26 -3.89 95% mean confidence interval for instructions %-change: -3.76% -3.56% Instructions are helped. total cycles in shared programs: 880772068 -> 880734134 (<.01%) cycles in affected programs: 2134456 -> 2096522 (-1.78%) helped: 941 HURT: 324 helped stats (abs) min: 2 max: 2180 x̄: 123.06 x̃: 44 helped stats (rel) min: 0.04% max: 49.96% x̄: 7.08% x̃: 3.81% HURT stats (abs) min: 2 max: 2098 x̄: 240.33 x̃: 35 HURT stats (rel) min: 0.04% max: 77.07% x̄: 12.34% x̃: 3.00% 95% mean confidence interval for cycles value: -47.93 -12.04 95% mean confidence interval for cycles %-change: -2.87% -1.34% Cycles are helped. No shader-db changes on any other Intel platform. Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17181>
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `OFTC's #dri-devel <irc://irc.oftc.net/dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.