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This is helpful for the driver to have the option to provide a custom threshold for the PQ test performed by the graph coloring algorithm. A threshold lower than the physical number of registers is helpful on platforms where the number of registers used can impose a limit on the thread parallelism of the program. In such platforms even though a passing PQ test guarantees that the node can be pushed onto the stack and neglected while coloring the remaining nodes, the ordering in which this happen can have a dramatic effect in the register pressure of the resulting shader and therefore also on the thread parallelism of the program. Setting a P value threshold lower than the real P value will cause nodes with Q value above the threshold to use the existing optimistic coloring heuristic that takes the effort of ordering nodes in the stack by Q value, in order to do a better job at minimizing the total register requirement of the program. Even though this causes us to hit the optimistic codepaths for trivially colorable nodes the interference graph is still guaranteed to be trivially colorable if it was trivially colorable without the override. The use of a threshold lower than the real P value will come at a compile-time performance cost, the specific trade-off between compile-time and run-time can be adjusted by the driver based on the number of registers available to each thread without causing a hit to thread parallelism. Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36618> |
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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://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ 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://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.