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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
d5d03a7273
Full global value numbering (GVN) can be pretty aggressive, moving values far away from their original locations, even out of loops, and can extend their live ranges a lot. So we've left it disabled. This patch introduces a weaker form of GVN: we only allow coalescing identical values when they appear on either side of the same if/else construct. For now, we also only allow ALU instructions. This allows nir_opt_gcm to clean up identical instructions appearing on both sides of if/then/else control flow. But it avoids aggressively combining every other occurrence of a value in the program. This can still have surprisingly large cascading effects, as simple constructs are cleaned up, leading to more opportunities to do the same clean up, up a chain of nested ifs. It also enables greater use of the select peephole as ifs are cleaned up. shader-db and fossil-db results show a reduction in spills/fills on Icelake, so it doesn't seem to be hurting register pressure. Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19823> |
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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.