39088571f0
Use predication instead of branching whenever possible and profitable: all divergent leaf branches are replaced with predication. Non-divergent branches are kept since for those a branch might be more performant when it jumps over all instructions. Although it might be possible to support a limited form of nested predication, this is more difficult to implement so we only support leaf branches for now. When translating from NIR to ir3, predication is emitted just like normal branches except that the branch is replaced with pred[tf] and the opposite (pred[ft]) is inserted at the end of the then-block. This pattern is then recognized during legalization at which point the closing prede is inserted. We don't insert this right away to allow opt_jump to optimize jumps out of the else-block. Since the branches we support for predication always have exactly one block in each arm, the then-block is emitted first, and blocks are never reordered, this way of emitting predicated branches ensures they have the correct memory layout. Signed-off-by: Job Noorman <jnoorman@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27982>
`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.