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If there are holes between color outputs (e.g. a shader exports MRT1, but not MRT0), we can remove the holes by moving higher MRTs lower. The hardware will remap the MRTs to their correct locations if we remove holes in SPI_SHADER_COL_FORMAT but not CB_SHADER_MASK. This is good for performance because the hardware will allocate less space for color MRTs. This also allows to remove even more unused color exports because we no longer need to force previous targets to be non-zero. Only SotTR seems affected from our fossils db. fossils-db (NAVI21): Totals from 859 (0.64% of 134913) affected shaders: VGPRs: 24328 -> 24216 (-0.46%) CodeSize: 1433276 -> 1422576 (-0.75%) Instrs: 255275 -> 253728 (-0.61%) Latency: 1666836 -> 1661544 (-0.32%) InvThroughput: 346038 -> 343406 (-0.76%) Copies: 16520 -> 16506 (-0.08%) PreSGPRs: 25934 -> 25920 (-0.05%) PreVGPRs: 19903 -> 19662 (-1.21%) Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5786>
`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.