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"Removing jumps" in ACO means skipping the jump instruction at the beginning of a divergent branch (but still modify exec). ACO already supports implicitly removing jumps when it decides that executing a branch with empty exec mask is more beneficial than a jump. This commit adds the possibility to use this explicitly through nir_selection_control. ACO will respect this setting and remove the branch instructions when this is specified, unless it decides that this would cause bugs (eg. exp instruction). There are two cases that benefit from the new change: 1. When the application requests to "flatten" a branch (ie. remove control flow), we now respect that. 2. When the compiler stack determines that a divergent branch is always taken. v2 by Georg Lehmann: fixed applying sel_ctrl to else blocks Fossil DB stats on Navi 21: Totals from 13 (0.01% of 134906) affected shaders: CodeSize: 136616 -> 136496 (-0.09%) Instrs: 26196 -> 26166 (-0.11%) Latency: 417928 -> 417889 (-0.01%) Branches: 1241 -> 1211 (-2.42%) Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Daniel Schürmann <daniel@schuermann.dev> Reviewed-By: Georg Lehmann <dadschoorse@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17921>
`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.