Francisco Jerez
e14529ff32
Together with the fixup_nomask_control_flow() pass introduced in a previous patch, this implements a less invasive alternative to the workaround documented in the hardware spec for GEN:BUG:1407528679, which doesn't involve disabling structured control flow. Under some conditions Gen12 hardware can end up executing a BB with all channels disabled, which will lead to the execution of any NoMask instructions in it, even though any execution-masked instructions will be correctly shot down. This could break assumptions of the SWSB pass if the data computed by a NoMask instruction is synchronized against by using an SWSB annotation baked into a regular execution-masked instruction, since the first (NoMask) instruction may be executed redundantly by the hardware, even though the second will correctly be shot down, potentially leading to a RaW or WaW hazard if a third instruction subsequently accesses the destination register of the first instruction. Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com> Cc: 20.0 <mesa-stable@lists.freedesktop.org>
`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 gitlab for patches submission, review and discussions.