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49f4f1ec22
We are updating the deadcode state while walking the program backwards.
When encountering ENDLOOP, we scan the loop, mark everything in the loop
as used and than continue as usuall. We were previously trying to be
smart with the breaks. This was however not working as expected.
Instead, save the most pesimistic deadcode state from the ENDLOOP and
just restore it anytime we see a break.
This keeps the code simple and more importantly does not touch the flat
and IF(-ELSE)-ENDIF paths at all so reduces the chances of regression.
No changes with my shader-db.
Fixes piglits on RV530:
shaders/ssa/fs-if-def-else-break.shader_test
spec/glsl-1.10/execution/vs-loop-array-index-unroll.shader_test
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5832
Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com>
Acked-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14661>
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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.