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The optimization pass will (eventually) turn the imul into a umul_32x16. In many cases, the multiply will be converted to something else. I also tried cloning a bunch of existing imul algebraic patterns for [iu]mul_32x16. This produced the same result, but it was a lot more churn. All of the shaders affected were ray tracing shaders in Q2RTX. This is the only ray tracing workload in my fossil-db. DG2 Totals: Instrs: 191995626 -> 191995079 (-0.00%); split: -0.00%, +0.00% Cycles: 14003803561 -> 14003798040 (-0.00%); split: -0.00%, +0.00% Spill count: 108320 -> 108288 (-0.03%) Fill count: 200695 -> 200663 (-0.02%) Scratch Memory Size: 8755200 -> 8754176 (-0.01%) Totals from 7 (0.00% of 652118) affected shaders: Instrs: 14998 -> 14451 (-3.65%); split: -3.94%, +0.29% Cycles: 137222 -> 131701 (-4.02%); split: -4.10%, +0.07% Spill count: 32 -> 0 (-inf%) Fill count: 32 -> 0 (-inf%) Scratch Memory Size: 19456 -> 18432 (-5.26%) Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27161>
`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.