c769641c8e
Pushing a unary operation, like fneg, into the operation that generates
its operand allows the fsat to be applied to the inner instruction
instead of on a separate instruction that performs the unary operation.
This changes
fmul ssa_100, ssa_99, ssa_98
fmov.sat ssa_101, -ssa_100
into
fmul.sat ssa_100, -ssa_99, ssa_98
Ice Lake, Skylake, and Broadwell had similar results. (Ice Lake shown)
total instructions in shared programs: 17228658 -> 17228584 (<.01%)
instructions in affected programs: 3163 -> 3089 (-2.34%)
helped: 49
HURT: 0
helped stats (abs) min: 1 max: 2 x̄: 1.51 x̃: 2
helped stats (rel) min: 0.58% max: 9.09% x̄: 3.69% x̃: 3.51%
95% mean confidence interval for instructions value: -1.66 -1.37
95% mean confidence interval for instructions %-change: -4.37% -3.00%
Instructions are helped.
total cycles in shared programs: 360937144 -> 360936431 (<.01%)
cycles in affected programs: 24029 -> 23316 (-2.97%)
helped: 47
HURT: 2
helped stats (abs) min: 4 max: 18 x̄: 15.34 x̃: 16
helped stats (rel) min: 0.69% max: 6.18% x̄: 3.78% x̃: 4.27%
HURT stats (abs) min: 4 max: 4 x̄: 4.00 x̃: 4
HURT stats (rel) min: 0.34% max: 0.67% x̄: 0.50% x̃: 0.50%
95% mean confidence interval for cycles value: -16.05 -13.05
95% mean confidence interval for cycles %-change: -4.07% -3.15%
Cycles are helped.
All Gen7 and earlier platforms had similar results. (Haswell shown)
total instructions in shared programs: 13536059 -> 13535884 (<.01%)
instructions in affected programs: 8797 -> 8622 (-1.99%)
helped: 150
HURT: 0
helped stats (abs) min: 1 max: 2 x̄: 1.17 x̃: 1
helped stats (rel) min: 0.40% max: 11.11% x̄: 3.51% x̃: 1.96%
95% mean confidence interval for instructions value: -1.23 -1.11
95% mean confidence interval for instructions %-change: -3.97% -3.05%
Instructions are helped.
total cycles in shared programs: 357696119 -> 357694193 (<.01%)
cycles in affected programs: 50216 -> 48290 (-3.84%)
helped: 109
HURT: 14
helped stats (abs) min: 2 max: 92 x̄: 18.97 x̃: 16
helped stats (rel) min: 0.26% max: 19.09% x̄: 7.37% x̃: 5.37%
HURT stats (abs) min: 2 max: 26 x̄: 10.14 x̃: 5
HURT stats (rel) min: 0.18% max: 4.73% x̄: 1.84% x̃: 0.92%
95% mean confidence interval for cycles value: -19.27 -12.05
95% mean confidence interval for cycles %-change: -7.34% -5.31%
Cycles are helped.
Reviewed-by: Matt Turner <mattst88@gmail.com>
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| bin | ||
| build-support | ||
| docs | ||
| doxygen | ||
| include | ||
| scons | ||
| scripts | ||
| src | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| CleanSpec.mk | ||
| README.rst | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
| appveyor.yml | ||
| common.py | ||
| meson.build | ||
| meson_options.txt | ||
README.rst
`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.