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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
d83d24e96a
With the exception of the backwards branch for loops, all the control flow we insert during instruction selection just predicates instructions rather than actually jumping around. That means, for example, we execute both sides of the if even for a uniform condition! That's inefficient. The solution is insert jmp_exec_none instructions after control flow in order to skip unexecuted regions, which is much faster than predicating them out. However, jmp_exec_none is costly in itself, so we need to use a heuristic to determine when it's actually beneficial. This uses a very simple heuristic for this purpose. However, it is a massive performance speed-up for Dolphin uber shaders: 39fps -> 67fps at 2x resolution. Nearly a doubling of performance! Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> |
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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.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.