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Increase the threshold to lower indirect indexing of arrays to scratch memory all the way up to 256 bytes, which was the lowest power-of-two threshold for which enabling the pass on Mali-G57 was a win in shaderdb. It's difficult to tell what threshold is optimal here. The shader-db stats are based on a rough cycle model that assumes a 16:1 ratio between CVT and load/store on Valhall, and a 24:1 ratio between arithmetic and load/store on Bifrost. Those ratios are at most rules of thumb, as the number of cycles required by a load/store instruction will vary tremendously based on caching and the memory controller. However, they may well be lower bounds (if those are the upper bounds on instruction issuing in the Mali shader cores). As such, a large threshold seems well motivated. shader-db results on Mali-G52 follow, results on Mali-G57 were similar. Note the shader that's hurt for spills/fills is *helped* for load/store overall. cycles helped: 129 -> 98 (-24.03%) (spills: 17 -> 20 (17.65%); fills: 34 -> 40 (17.65%)) ldst helped: 129 -> 98 (-24.03%) (spills: 17 -> 20 (17.65%); fills: 34 -> 40 (17.65%)) total instructions in shared programs: 2415410 -> 2415372 (<.01%) instructions in affected programs: 1041 -> 1003 (-3.65%) helped: 3 HURT: 0 helped stats (abs) min: 2.0 max: 31.0 x̄: 12.67 x̃: 5 helped stats (rel) min: 2.08% max: 6.02% x̄: 3.90% x̃: 3.60% total tuples in shared programs: 1928558 -> 1928527 (<.01%) tuples in affected programs: 826 -> 795 (-3.75%) helped: 2 HURT: 1 helped stats (abs) min: 6.0 max: 26.0 x̄: 16.00 x̃: 16 helped stats (rel) min: 3.72% max: 9.68% x̄: 6.70% x̃: 6.70% HURT stats (abs) min: 1.0 max: 1.0 x̄: 1.00 x̃: 1 HURT stats (rel) min: 1.54% max: 1.54% x̄: 1.54% x̃: 1.54% total clauses in shared programs: 355013 -> 354981 (<.01%) clauses in affected programs: 220 -> 188 (-14.55%) helped: 3 HURT: 0 helped stats (abs) min: 2.0 max: 27.0 x̄: 10.67 x̃: 3 helped stats (rel) min: 13.99% max: 21.43% x̄: 16.93% x̃: 15.38% total cycles in shared programs: 166610.27 -> 166574.90 (-0.02%) cycles in affected programs: 138 -> 102.62 (-25.63%) helped: 3 HURT: 0 helped stats (abs) min: 0.4583330000000001 max: 31.0 x̄: 11.79 x̃: 3 helped stats (rel) min: 15.28% max: 65.28% x̄: 34.86% x̃: 24.03% total arith in shared programs: 73690.13 -> 73690.58 (<.01%) arith in affected programs: 29.71 -> 30.17 (1.54%) helped: 1 HURT: 2 helped stats (abs) min: 0.0833339999999998 max: 0.0833339999999998 x̄: 0.08 x̃: 0 helped stats (rel) min: 3.85% max: 3.85% x̄: 3.85% x̃: 3.85% HURT stats (abs) min: 0.125 max: 0.4166659999999993 x̄: 0.27 x̃: 0 HURT stats (rel) min: 1.66% max: 5.17% x̄: 3.42% x̃: 3.42% total ldst in shared programs: 135611 -> 135571 (-0.03%) ldst in affected programs: 138 -> 98 (-28.99%) helped: 3 HURT: 0 helped stats (abs) min: 3.0 max: 31.0 x̄: 13.33 x̃: 6 helped stats (rel) min: 24.03% max: 100.00% x̄: 74.68% x̃: 100.00% total quadwords in shared programs: 1674599 -> 1674523 (<.01%) quadwords in affected programs: 838 -> 762 (-9.07%) helped: 3 HURT: 0 helped stats (abs) min: 2.0 max: 65.0 x̄: 25.33 x̃: 9 helped stats (rel) min: 3.39% max: 15.00% x̄: 9.14% x̃: 9.04% total spills in shared programs: 37 -> 40 (8.11%) spills in affected programs: 17 -> 20 (17.65%) helped: 0 HURT: 1 total fills in shared programs: 190 -> 196 (3.16%) fills in affected programs: 34 -> 40 (17.65%) helped: 0 HURT: 1 Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17101> |
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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.