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e342d6970b
In many cases, fsat, fneg, fabs, ineg, and iabs will get folded into
another instruction as either source or destination modifiers.
Counting them as instructions means that some if-statements won't get
converted to selects. For example,
vec1 32 ssa_25 = flt32 ssa_0, ssa_23.x
/* succs: block_1 block_2 */
if ssa_25 {
block block_1:
/* preds: block_0 */
vec1 32 ssa_26 = fabs ssa_24
vec1 32 ssa_27 = fneg ssa_26
vec1 32 ssa_28 = fabs ssa_20
vec1 32 ssa_29 = fneg ssa_28
vec1 32 ssa_30 = fmul ssa_27, ssa_29
vec1 32 ssa_31 = fsat ssa_30
/* succs: block_3 */
} else {
block block_2:
/* preds: block_0 */
/* succs: block_3 */
}
block block_3:
/* preds: block_1 block_2 */
block_1 isn't really 6 instructions, but it will be counted that way.
Most callers of the peephole_select pass use either 1 or 8. It's very
easy to blow way past either of these limits with things that are really
only one or two actual instructions.
I also tried some fancier things like making sure the fsat was of
another SSA def from the same block, but the simple test was actually
better.
The i965 back-end SEL peephole pass still helps ~700 shaders in
shader-db with this change.
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
All Gen6+ platforms had similar results. (Ice Lake shown)
total instructions in shared programs: 14743694 -> 14738910 (-0.03%)
instructions in affected programs: 156575 -> 151791 (-3.06%)
helped: 1204
HURT: 0
helped stats (abs) min: 1 max: 27 x̄: 3.97 x̃: 3
helped stats (rel) min: 0.15% max: 19.57% x̄: 5.15% x̃: 4.55%
95% mean confidence interval for instructions value: -4.12 -3.82
95% mean confidence interval for instructions %-change: -5.35% -4.95%
Instructions are helped.
total cycles in shared programs: 231749141 -> 231602916 (-0.06%)
cycles in affected programs: 2818975 -> 2672750 (-5.19%)
helped: 876
HURT: 322
helped stats (abs) min: 2 max: 788 x̄: 180.99 x̃: 220
helped stats (rel) min: <.01% max: 43.82% x̄: 20.75% x̃: 19.44%
HURT stats (abs) min: 1 max: 1188 x̄: 38.27 x̃: 20
HURT stats (rel) min: 0.09% max: 102.67% x̄: 5.17% x̃: 1.70%
95% mean confidence interval for cycles value: -130.47 -113.64
95% mean confidence interval for cycles %-change: -14.85% -12.72%
Cycles are helped.
total sends in shared programs: 730495 -> 730491 (<.01%)
sends in affected programs: 46 -> 42 (-8.70%)
helped: 2
HURT: 0
Iron Lake and GM45 had similar results. (Iron Lake shown)
total instructions in shared programs: 8122757 -> 8122617 (<.01%)
instructions in affected programs: 14716 -> 14576 (-0.95%)
helped: 46
HURT: 1
helped stats (abs) min: 1 max: 8 x̄: 3.07 x̃: 3
helped stats (rel) min: 0.36% max: 10.00% x̄: 2.54% x̃: 1.06%
HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
HURT stats (rel) min: 1.59% max: 1.59% x̄: 1.59% x̃: 1.59%
95% mean confidence interval for instructions value: -3.42 -2.54
95% mean confidence interval for instructions %-change: -3.28% -1.62%
Instructions are helped.
total cycles in shared programs: 188510100 -> 188509780 (<.01%)
cycles in affected programs: 58994 -> 58674 (-0.54%)
helped: 32
HURT: 1
helped stats (abs) min: 2 max: 96 x̄: 10.06 x̃: 6
helped stats (rel) min: 0.05% max: 15.29% x̄: 1.37% x̃: 0.31%
HURT stats (abs) min: 2 max: 2 x̄: 2.00 x̃: 2
HURT stats (rel) min: 0.68% max: 0.68% x̄: 0.68% x̃: 0.68%
95% mean confidence interval for cycles value: -16.34 -3.06
95% mean confidence interval for cycles %-change: -2.46% -0.15%
Cycles are helped.
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| .gitlab-ci | ||
| bin | ||
| build-support | ||
| docs | ||
| doxygen | ||
| include | ||
| scons | ||
| src | ||
| subprojects | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| CleanSpec.mk | ||
| common.py | ||
| meson.build | ||
| meson_options.txt | ||
| README.rst | ||
| REVIEWERS | ||
| SConstruct | ||
| 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.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.