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9b19409ac8
remove_trivial_phi() mostly does nothing for non-array phis, but it
rewrites sources if their definining instruction are trivial phis.
In the case of trivial phis in the loop continue block (for loops with
divergent non-trivial continues), we might need to keep those if they
write a shared register, because the source of the trivial phi will not be
reachable from the loop header phi.
In this example, the predecessors of the continue block should be block2,
but the physical predecessors are block2 and block3, requiring a phi in
the continue block which will then be lowered by ir3_lower_shared_phis.
loop {
block1:
a = phi 0, b
if (divergent) {
block2:
b = a + 1
continue;
}
block3:
break;
}
Fixes RA validation error when compiling blackmythwukong/5645a84e669a6179
from radv_fossils.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Backport-to: 26.0
(cherry picked from commit
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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.