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25ab37ae5b
Predicate registers can be written from the scalar ALU by using a special cat2 encoding: if the dst is encoded as a0.c, the instruction will execute on the scalar ALU and write to p0.c. This commit makes the ir3 backend aware of scalar predicates. A new register flag (IR3_REG_UNIFORM) is added that can be used to mark predicate dsts as being written by the scalar ALU. For such dsts, the same synchronization rules apply as for shared registers written by the scalar ALU (e.g., (ss) is needed to read them from the vector ALU). Scalar predicates can be used in the early preamble, which makes control flow available there. In many ways, the backend treats IR3_REG_UNIFORM the same as IR3_REG_SHARED. A new flag was added because IR3_REG_SHARED is mainly used to denote a separate register file, not as a flag to indicate usage by the scalar ALU. Scalar predicates still use the normal predicate register file but allow it to be written from the scalar ALU. Signed-off-by: Job Noorman <jnoorman@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36614> |
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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://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.