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2dff9a66b6
v2: Fix silly bug in logic. s/||/&&/
All but one of the affected shaders is in an Unreal4 demo. The other is
in Tomb Raider. All of the cases that Ian investigated appear to be
sequences like the following
if (int(uint(some_float)) < 0) /* other relations too */
...
At least in Tomb Raider, it's not obvious that this sequence came from
the original shader.
In some of the Unreal demos, the shader contains code like
if (int(uint(textureLod(...))) > 0)
...
which explicitly generates the offending sequence.
All Gen6+ platforms had similar results (Skylake shown):
total instructions in shared programs: 15437170 -> 15437187 (<.01%)
instructions in affected programs: 4492 -> 4509 (0.38%)
helped: 0
HURT: 17
HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel) min: 0.05% max: 0.73% x̄: 0.66% x̃: 0.73%
95% mean confidence interval for instructions value: 1.00 1.00
95% mean confidence interval for instructions %-change: 0.57% 0.75%
Instructions are HURT.
total cycles in shared programs: 383007996 -> 383007992 (<.01%)
cycles in affected programs: 20542 -> 20538 (-0.02%)
helped: 6
HURT: 7
helped stats (abs) min: 2 max: 6 x̄: 5.33 x̃: 6
helped stats (rel) min: 0.11% max: 0.36% x̄: 0.32% x̃: 0.36%
HURT stats (abs) min: 4 max: 4 x̄: 4.00 x̃: 4
HURT stats (rel) min: 0.27% max: 0.27% x̄: 0.27% x̃: 0.27%
95% mean confidence interval for cycles value: -3.30 2.69
95% mean confidence interval for cycles %-change: -0.19% 0.19%
Inconclusive result (value mean confidence interval includes 0).
No changes on Iron Lake or GM45.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109404
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: nagrigoriadis@gmail.com
Tested-by: Danylo Piliaiev <danylo.piliaiev@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.