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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
0986199b31
Empirical testing shows that gen8 has a bug where MAD instructions with a half-float source starting at a non-zero offset fail to execute properly. This scenario usually happened in SIMD8 executions, where we used to pack vector components Y and W in the second half of SIMD registers (therefore, with a 16B offset). It looks like we are not currently doing this any more but this would handle the situation properly if we ever happen to produce code like this again. v2 (Jason): - Move this workaround to the lower_regioning pass as an additional case to has_invalid_src_region() - Do not apply the workaround if the stride of the source operand is 0, testing suggests the problem doesn't exist in that case. v3 (Jason): - We want offset % REG_SIZE > 0, not just offset > 0 - Use a helper to compute the offset Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com> (v1) |
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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.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <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 `Freenode's #dri-devel <irc://chat.freenode.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.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.