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This prevents some additional optimizations that would change the original result. This includes things like (b < a && b < c) => b < min(a, c) and !(a < b) => b >= a. Both of these optimizations were specifically observed in the piglit tests added in piglit!160. This was discovered while investigating https://gitlab.freedesktop.org/mesa/mesa/issues/1958. However, the problem in that issue was Chrome or Angle is replacing calls to isnan() with some stuff that we (correctly) optimize to false. If they had left the calls to isnan() alone, everything would have just worked. No shader-db changes on any Intel platform. I also tried marking the comparison generated by the isnan() function precise. The precise marker "infects" every computation involved in calculating the parameter to the isnan() function, and this severely hurt all of the (few) shaders in shader-db that use isnan(). I also considered adding a new ir_unop_isnan opcode that would implement the functionality. During GLSL IR-to-NIR translation, the resulting comparison operation would be marked exact (and the samething would need to happen in SPIR-V translation). This approach taken by this patch seemed easier, but we may want to do the ir_unop_isnan thing anyway. Fixes: |
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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.