9d4ba885bb
ir3_ra allocates registers in a round-robin fashion to avoid false dependencies. In order to do this, it keeps track of a "file start" register for each register file and will search starting from there for available registers. This file start is initialized at the beginning of RA of kept across blocks, including across the preamble. This means that a change that only affects the preamble may cause changes in how registers are allocated in the main shader. This may result in more or less copies, and more or less false dependencies which changes the behavior of postsched. Changes in the preamble affecting the main shader makes it more difficult to analyze shader-db results, as I often find myself chasing down a regression that is just caused by RA/postsched "bad luck" in a main shader that didn't actually change. Prevent this by resetting the file start at the beginning of the main shader. Totals: Instrs: 364710030 -> 364631384 (-0.02%); split: -0.19%, +0.17% CodeSize: 926766046 -> 926671488 (-0.01%); split: -0.10%, +0.09% NOPs: 47703035 -> 47653319 (-0.10%); split: -1.05%, +0.94% MOVs: 17072354 -> 17075112 (+0.02%); split: -1.28%, +1.29% COVs: 4098062 -> 4096784 (-0.03%); split: -0.04%, +0.01% Full: 15164359 -> 15112404 (-0.34%); split: -0.34%, +0.00% (ss): 7818796 -> 7819147 (+0.00%); split: -1.10%, +1.11% (sy): 3985674 -> 3983435 (-0.06%); split: -0.72%, +0.67% (ss)-stall: 26535279 -> 26525929 (-0.04%); split: -1.36%, +1.32% (sy)-stall: 111983489 -> 111716382 (-0.24%); split: -1.26%, +1.02% Last helper: 116734916 -> 116595531 (-0.12%); split: -0.62%, +0.50% Cat0: 53338794 -> 53289450 (-0.09%); split: -0.94%, +0.85% Cat1: 22352349 -> 22328303 (-0.11%); split: -1.28%, +1.17% Cat2: 155348173 -> 155348012 (-0.00%); split: -0.00%, +0.00% Cat7: 9314194 -> 9309099 (-0.05%); split: -0.88%, +0.82% Totals from 224302 (16.59% of 1352016) affected shaders: Instrs: 148838101 -> 148759455 (-0.05%); split: -0.47%, +0.42% CodeSize: 404838970 -> 404744412 (-0.02%); split: -0.22%, +0.20% NOPs: 26261983 -> 26212267 (-0.19%); split: -1.90%, +1.71% MOVs: 8372715 -> 8375473 (+0.03%); split: -2.60%, +2.63% COVs: 2061488 -> 2060210 (-0.06%); split: -0.09%, +0.02% Full: 3420300 -> 3368345 (-1.52%); split: -1.52%, +0.00% (ss): 3848423 -> 3848774 (+0.01%); split: -2.24%, +2.25% (sy): 2021040 -> 2018801 (-0.11%); split: -1.43%, +1.32% (ss)-stall: 13554064 -> 13544714 (-0.07%); split: -2.65%, +2.59% (sy)-stall: 59778475 -> 59511368 (-0.45%); split: -2.36%, +1.91% Last helper: 52847662 -> 52708277 (-0.26%); split: -1.38%, +1.12% Cat0: 29270336 -> 29220992 (-0.17%); split: -1.72%, +1.55% Cat1: 10820261 -> 10796215 (-0.22%); split: -2.63%, +2.41% Cat2: 57289060 -> 57288899 (-0.00%); split: -0.00%, +0.00% Cat7: 5686726 -> 5681631 (-0.09%); split: -1.43%, +1.34% Signed-off-by: Job Noorman <jnoorman@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37003>
`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.