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Memory fences do not refer to an element of a binding table. Rather, the reason we had "BTI" in these opcodes was to distinguish what in modern terms are called UGM (untyped memory data cache) vs. SLM (cross-thread shared local memory) fences. Icelake and older platforms used the "data cache" SFID for both purposes, distinguishing them by having a special binding table index, 254, meaning "this is actually SLM access". This is where the notion that fences had BTIs came in. (In fact, prior to Icelake, separate SLM fences were not a thing, so BTI wasn't used there either.) To avoid confusion about BTI being involved, we choose a simpler lie: we have Icelake SLM fences target GFX12_SFID_SLM (like modern platforms would), even though it didn't really exist back then. Later lowering code sets it back to the correct Data Cache SFID with magic SLM binding table index. This eliminates BTI everywhere and an unnecessary source. Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33297>
`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.