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1a9a0a15f7
We are generally fine with undefs. However, booleans are only allowed to contain 0/1 but are stored in 16b registers. Undefs may cause such registers to be uninitialized and contain values other than 0/1. This especially happens with undef booleans in phi srcs, which are explicitly left uninitialized. In general, such non-0/1 values don't cause problems because we mostly use booleans by comparing them to 0. However, they do cause problems in special cases like `inot(x)` which we lower to `sub(1, x)` which only works if true==1. Fixes misrenderings in "Kingdoms of Amalur: Reckoning". Totals from 12 (0.01% of 176258) affected shaders: Instrs: 14590 -> 14615 (+0.17%) CodeSize: 29796 -> 29808 (+0.04%) NOPs: 3091 -> 3098 (+0.23%); split: -0.03%, +0.26% MOVs: 735 -> 748 (+1.77%) (sy)-stall: 4509 -> 4508 (-0.02%) Cat0: 3471 -> 3483 (+0.35%); split: -0.03%, +0.37% Cat1: 1257 -> 1270 (+1.03%) Signed-off-by: Job Noorman <jnoorman@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/42051> |
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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.