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3db8dbfdc3
Re-associate the calculation. The current calcuation is
((lane + zero_or_8) << 2) + offset
The first addition is SIMD8, and the shift and second addition are
SIMD16. By switching to
((lane << 2) + offset) + zero_or_32
All operations are SIMD8.
The SHL operates directly on the UW 0x76543210UV value, and that
eliminates the MOV to expand the UW to UD.
v2: Switch to alternate method. Update for SIMD32 on Xe2.
No shader-db or fossil-db changes on any pre-Gfx12.5 platforms.
shader-db:
Lunar Lake, Meteor Lake, and DG2 had similar results. (Lunar Lake shown)
total instructions in shared programs: 17121519 -> 17119962 (<.01%)
instructions in affected programs: 73208 -> 71651 (-2.13%)
helped: 36
HURT: 0
helped stats (abs) min: 1 max: 129 x̄: 43.25 x̃: 56
helped stats (rel) min: 0.05% max: 4.92% x̄: 2.50% x̃: 2.79%
95% mean confidence interval for instructions value: -56.02 -30.48
95% mean confidence interval for instructions %-change: -3.24% -1.75%
Instructions are helped.
total cycles in shared programs: 895450146 -> 895433316 (<.01%)
cycles in affected programs: 13709400 -> 13692570 (-0.12%)
helped: 31
HURT: 2
helped stats (abs) min: 26 max: 1654 x̄: 543.10 x̃: 672
helped stats (rel) min: <.01% max: 3.43% x̄: 0.43% x̃: 0.51%
HURT stats (abs) min: 2 max: 4 x̄: 3.00 x̃: 3
HURT stats (rel) min: <.01% max: <.01% x̄: <.01% x̃: <.01%
95% mean confidence interval for cycles value: -652.42 -367.58
95% mean confidence interval for cycles %-change: -0.61% -0.19%
Cycles are helped.
fossil-db:
Lunar Lake, Meteor Lake, and DG2 had similar results. (Lunar Lake shown)
Totals:
Instrs: 210566294 -> 210052706 (-0.24%)
Cycle count: 31582309052 -> 31486266412 (-0.30%); split: -0.30%, +0.00%
Totals from 7091 (1.00% of 707082) affected shaders:
Instrs: 17408115 -> 16894527 (-2.95%)
Cycle count: 6443785290 -> 6347742650 (-1.49%); split: -1.49%, +0.00%
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34886>
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| VERSION | ||
`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.