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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
c6a6902e4d
On a6xx+, bitwise operations can directly write to predicate registers. The result will be 1 iff the result of the non-predicate operation would be non-zero. When generating instructions that need a predicate source, ir3 will insert a cmps.s.ne 0 instruction to guarantee a predicate can be produced. This is kept in place by this patch and we add a pass that tries to optimize useless comparisons away. Concretely: - Look through chains of multiple cmps.s.ne instructions and remove all but the first. - If the source of the cmps.s.ne can write directly to predicates, remove the cmps.s.ne. In both cases, no instructions are actually removed but clones are made and we rely on DCE to remove anything that became unused. Note that it's fine to always make a clone since even in the case that the original instruction is also used for non-predicate sources (so it won't be DCE'd), we replaced a cmps.ne.s with another instruction so this pass should never increase instruction count. Note that this pass replaces the double-comparison folding that was performed by ir3_cp before. Signed-off-by: Job Noorman <jnoorman@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27411> |
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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.