Marek Olšák
13acbaecd8
Instead of storing the vertex mask per wave into LDS and then computing the prefix sum, store 8-bit bitcounts (vertex counts) of the vertex masks into LDS. This allows us to compute the sum using v_sad_u8, which computes a sum of 4 i8vec4 components in one instruction. Each i8vec4 of vertex counts is loaded in parallel threads (one dword per thread) instead of all being loaded in thread 0, and readlane copies them to SGPRs instead of readfirstlane. LDS is no longer initialized before culling. Instead, the counts for inactive waves are masked with AND later. Incorrect old comments are also fixed. This change removes 80 bytes from the code size, and it allows increasing the workgroup size from 128 to 256. (which is the main motivation for this) Now changing the workgroup size with wave64 has no effect on the code size. Switching to wave32 with 8 waves even generates slightly smaller code than wave64 with 4 waves. Reviewed-by: Timur Kristóf <timur.kristof@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10813>
`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.