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For some reason, when I first wrote try_immediate_source, I thought the sources had already been ordered so that the immediate value was the second source. That's rubbish. The generator assumes *neither* source is immediate, and it relies on later copy/constant propagation passes to do the reordering. For this reason, the changes to try_immediate_source have to go to some efforts to reorder the operands and tell the caller when it reordered them. The generator for comparison instructions uses this to determine when the comparison needs to change (e.g., from GT to LT). No changes on any Gen8 or later platform because those platforms do not use the vec4 backend. Haswell total instructions in shared programs: 13484431 -> 13480500 (-0.03%) instructions in affected programs: 441138 -> 437207 (-0.89%) helped: 1883 HURT: 0 helped stats (abs) min: 1 max: 49 x̄: 2.09 x̃: 1 helped stats (rel) min: 0.07% max: 8.91% x̄: 1.10% x̃: 0.90% 95% mean confidence interval for instructions value: -2.19 -1.98 95% mean confidence interval for instructions %-change: -1.14% -1.06% Instructions are helped. total cycles in shared programs: 376420286 -> 376406400 (<.01%) cycles in affected programs: 15995668 -> 15981782 (-0.09%) helped: 1692 HURT: 219 helped stats (abs) min: 2 max: 764 x̄: 13.78 x̃: 4 helped stats (rel) min: <.01% max: 9.69% x̄: 0.69% x̃: 0.35% HURT stats (abs) min: 2 max: 516 x̄: 43.09 x̃: 22 HURT stats (rel) min: 0.02% max: 12.09% x̄: 2.30% x̃: 1.13% 95% mean confidence interval for cycles value: -9.70 -4.83 95% mean confidence interval for cycles %-change: -0.42% -0.28% Cycles are helped. total spills in shared programs: 23166 -> 23158 (-0.03%) spills in affected programs: 66 -> 58 (-12.12%) helped: 2 HURT: 0 total fills in shared programs: 34592 -> 34580 (-0.03%) fills in affected programs: 75 -> 63 (-16.00%) helped: 2 HURT: 0 Ivy Bridge total instructions in shared programs: 12051590 -> 12048513 (-0.03%) instructions in affected programs: 355911 -> 352834 (-0.86%) helped: 1481 HURT: 0 helped stats (abs) min: 1 max: 12 x̄: 2.08 x̃: 1 helped stats (rel) min: 0.07% max: 4.92% x̄: 1.08% x̃: 0.90% 95% mean confidence interval for instructions value: -2.17 -1.98 95% mean confidence interval for instructions %-change: -1.12% -1.04% Instructions are helped. total cycles in shared programs: 180319624 -> 180307642 (<.01%) cycles in affected programs: 15591028 -> 15579046 (-0.08%) helped: 1340 HURT: 174 helped stats (abs) min: 2 max: 764 x̄: 14.19 x̃: 2 helped stats (rel) min: <.01% max: 8.68% x̄: 0.64% x̃: 0.32% HURT stats (abs) min: 2 max: 518 x̄: 40.41 x̃: 14 HURT stats (rel) min: 0.02% max: 8.37% x̄: 1.59% x̃: 0.67% 95% mean confidence interval for cycles value: -10.85 -4.97 95% mean confidence interval for cycles %-change: -0.45% -0.31% Cycles are helped. All Gen6 and earlier platforms had simlar results. (Sandy Bridge shown) total instructions in shared programs: 10863159 -> 10861462 (-0.02%) instructions in affected programs: 157839 -> 156142 (-1.08%) helped: 715 HURT: 0 helped stats (abs) min: 1 max: 12 x̄: 2.37 x̃: 2 helped stats (rel) min: 0.23% max: 4.33% x̄: 1.07% x̃: 0.85% 95% mean confidence interval for instructions value: -2.53 -2.21 95% mean confidence interval for instructions %-change: -1.13% -1.02% Instructions are helped. total cycles in shared programs: 153957782 -> 153948778 (<.01%) cycles in affected programs: 3171648 -> 3162644 (-0.28%) helped: 696 HURT: 62 helped stats (abs) min: 2 max: 390 x̄: 15.72 x̃: 4 helped stats (rel) min: 0.02% max: 10.57% x̄: 0.57% x̃: 0.12% HURT stats (abs) min: 2 max: 300 x̄: 31.29 x̃: 2 HURT stats (rel) min: 0.11% max: 7.23% x̄: 0.83% x̃: 0.34% 95% mean confidence interval for cycles value: -15.65 -8.11 95% mean confidence interval for cycles %-change: -0.56% -0.36% Cycles are helped. Reviewed-by: Matt Turner <mattst88@gmail.com> |
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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 email mailing-lists for patches submission, review and discussions.