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In one branch we know that expDiff is already positive. In the other branch we know the expDiff is negative. Previously in that branch the code was -(expDiff + 1). This is equvialent to (-expDiff) - 1, and since expDiff is negative, abs(expDiff) - 1. The main purpose of this commit is to prepare for "soft-fp64/fadd: Move common code out of both branches of an if-statement". Results on the 308 shaders extracted from the fp64 portion of the OpenGL CTS: Tiger Lake and Ice Lake had similar results. (Tiger Lake shown) total instructions in shared programs: 818246 -> 819560 (0.16%) instructions in affected programs: 756423 -> 757737 (0.17%) helped: 1 HURT: 73 helped stats (abs) min: 1205 max: 1205 x̄: 1205.00 x̃: 1205 helped stats (rel) min: 1.36% max: 1.36% x̄: 1.36% x̃: 1.36% HURT stats (abs) min: 2 max: 149 x̄: 34.51 x̃: 27 HURT stats (rel) min: 0.14% max: 1.09% x̄: 0.41% x̃: 0.30% 95% mean confidence interval for instructions value: -16.56 52.07 95% mean confidence interval for instructions %-change: 0.30% 0.47% Inconclusive result (value mean confidence interval includes 0). total cycles in shared programs: 6816686 -> 6817254 (<.01%) cycles in affected programs: 6384704 -> 6385272 (<.01%) helped: 37 HURT: 37 helped stats (abs) min: 30 max: 5790 x̄: 289.05 x̃: 102 helped stats (rel) min: 0.04% max: 0.86% x̄: 0.29% x̃: 0.31% HURT stats (abs) min: 2 max: 1020 x̄: 304.41 x̃: 232 HURT stats (rel) min: <.01% max: 1.58% x̄: 0.55% x̃: 0.43% 95% mean confidence interval for cycles value: -165.37 180.72 95% mean confidence interval for cycles %-change: <.01% 0.27% Inconclusive result (value mean confidence interval includes 0). total spills in shared programs: 705 -> 591 (-16.17%) spills in affected programs: 705 -> 591 (-16.17%) helped: 1 HURT: 0 total fills in shared programs: 1501 -> 1353 (-9.86%) fills in affected programs: 1501 -> 1353 (-9.86%) helped: 1 HURT: 0 Reviewed-by: Matt Turner <mattst88@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4142> |
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`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.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <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 `Freenode's #dri-devel <irc://chat.freenode.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.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.