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Instead, we do UBO and SSBO deref lowering in NIR after we've given it a
chance to optimize SSBO access:
Shader-db results on Kaby Lake:
total instructions in shared programs: 15235775 -> 15235484 (<.01%)
instructions in affected programs: 14992 -> 14701 (-1.94%)
helped: 19
HURT: 20
total cycles in shared programs: 339220331 -> 339027307 (-0.06%)
cycles in affected programs: 79831981 -> 79638957 (-0.24%)
helped: 540
HURT: 602
total loops in shared programs: 4402 -> 4348 (-1.23%)
loops in affected programs: 186 -> 132 (-29.03%)
helped: 27
HURT: 0
total spills in shared programs: 23261 -> 23234 (-0.12%)
spills in affected programs: 38 -> 11 (-71.05%)
helped: 1
HURT: 0
total fills in shared programs: 31442 -> 31371 (-0.23%)
fills in affected programs: 98 -> 27 (-72.45%)
helped: 1
HURT: 0
LOST: 12
GAINED: 12
Most of the help and hurt in instruction counts was just churn caused by
re-ordering of optimizations and the fact that the NIR deref lowering
code is emitting slightly different instructions. Nothing was hurt by
more than three instructions and most things weren't helped by more than
four. The primary exception to this is one Car Chase shader:
shaders/non-free/gfxbench4/carchase/341.shader_test CS SIMD32: 1144 -> 821 (-28.23%)
There is also one compute shader in Manhattan 3.1 and a fragment shader
in the UE4 Shooter Game demo that now get a loop partially unrolled.
Those showed up in the results as hurt instructions but were manually
removed to get the results above.
The lost/gained was a dozen Car Chase shaders that went from SIMD8 to
SIMD16 thanks to improved register pressure:
shaders/non-free/gfxbench4/carchase/366.shader_test CS
shaders/non-free/gfxbench4/carchase/368.shader_test CS
shaders/non-free/gfxbench4/carchase/370.shader_test CS
shaders/non-free/gfxbench4/carchase/372.shader_test CS
shaders/non-free/gfxbench4/carchase/376.shader_test CS
shaders/non-free/gfxbench4/carchase/378.shader_test CS
shaders/non-free/gfxbench4/carchase/380.shader_test CS
shaders/non-free/gfxbench4/carchase/382.shader_test CS
shaders/non-free/gfxbench4/carchase/384.shader_test CS
shaders/non-free/gfxbench4/carchase/388.shader_test CS
shaders/non-free/gfxbench4/carchase/4.shader_test CS
shaders/non-free/gfxbench4/carchase/6.shader_test CS
Given how much it appeared to be improved, I ran Car Chase on my laptop.
Unfortunately, I wasn't able to see any measurable improvement. It
might be helped by 1-2% but it's in the noise. It does render correctly
as far as I can tell so the improvement is legitimate.
All of the loops that got delete were in dolphin uber shaders. I've had
no opportunity to test them for correctness or performance.
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
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| meson_options.txt | ||
| README.rst | ||
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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.