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In the past, multiple writes to a single register were pretty common, but since we've transitioned to NIR, and leave the IR in SSA form for everything not captured in a phi-web, the pattern of generating new temporary registers at each step is a lot more common. This pass isn't nearly as useful now. Across fossil-db on Alchemist, this affects only 0.55% of shaders, which fall into two cases: - Coarse pixel shading pixel-X/Y setup. There are a few cases where we write a partial calculation into a register, then have a second instruction read that as a source and overwrite it as a destination. While we could use a temporary here, it doesn't actually help with register pressure at all, since there's the same amount of values live at both instructions regardless. So while this pass kicks in, it doesn't do anything useful. - Geometry shader control data bits (5 shaders total). We track masks for handling EndPrimitive in a single register across the program, and apparently in some cases can split the live range. However, it's a single register...only in geometry shaders...which use EndPrimitive. None of them appear to be in danger of spilling, either. So this tiny benefit doesn't seem to justify the cost of running the pass. So, just throw it out. It's not worth keeping. Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26343> |
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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.