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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
e1b3eff8d2
On Gfx4 and Gfx5, sel.l (for min) and sel.ge (for max) are implemented using a separte cmpn and sel instruction. This lowering occurs in fs_vistor::lower_minmax which is called very, very late... a long, long time after the first calls to opt_cmod_propagation. As a result, conditional modifiers can be incorrectly propagated across sel.cond on those platforms. No tests were affected by this change, and I find that quite shocking. After just changing flags_written(), all of the atan tests started failing on ILK. That required the change in cmod_propagatin (and the addition of the prop_across_into_sel_gfx5 unit test). Shader-db results for ILK and GM45 are below. I looked at a couple before and after shaders... and every case that I looked at had experienced incorrect cmod propagation. This affected a LOT of apps! Euro Truck Simulator 2, The Talos Principle, Serious Sam 3, Sanctum 2, Gang Beasts, and on and on... :( I discovered this bug while working on a couple new optimization passes. One of the passes attempts to remove condition modifiers that are never used. The pass made no progress except on ILK and GM45. After investigating a couple of the affected shaders, I noticed that the code in those shaders looked wrong... investigation led to this cause. v2: Trivial changes in the unit tests. v3: Fix type in comment in unit tests. Noticed by Jason and Priit. v4: Tweak handling of BRW_OPCODE_SEL special case. Suggested by Jason. Fixes: |
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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.