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a4b36cd3dd
Consider the following case:
// g119-123 are written somewhere above
mul.sat(16) g67<1>F g6.4<0,1,0>F g125<8,8,1>F
mul.sat(16) g69<1>F g6.5<0,1,0>F g125<8,8,1>F
mul.sat(16) g71<1>F g6.6<0,1,0>F g125<8,8,1>F
mov(16) g119<1>F g67<8,8,1>F
mov(16) g121<1>F g69<8,8,1>F
mov(16) g123<1>F g71<8,8,1>F
We should be able to coalesce it into
mul.sat(16) g119<1>F g6.4<0,1,0>F g125<8,8,1>F
mul.sat(16) g121<1>F g6.5<0,1,0>F g125<8,8,1>F
mul.sat(16) g123<1>F g6.6<0,1,0>F g125<8,8,1>F
What's stopping us is an overly conservative check for writes to the two
registers being coalesced. The check walks over the intersection of
their live ranges and checks for no writes to either one. However,
because the register which starts the live range (the mul.sat in this
case) is inside that intersection, we flag it as a write in the
intersection and don't coalesce. However, this case is safe because the
destination register of the copy is never read after the source is
written.
Shader-db changes on ICL:
total instructions in shared programs: 16043613 -> 16042610 (<.01%)
instructions in affected programs: 43036 -> 42033 (-2.33%)
helped: 226
HURT: 0
helped stats (abs) min: 1 max: 30 x̄: 4.44 x̃: 4
helped stats (rel) min: 0.09% max: 26.67% x̄: 4.89% x̃: 3.43%
95% mean confidence interval for instructions value: -4.86 -4.02
95% mean confidence interval for instructions %-change: -5.57% -4.22%
Instructions are helped.
total cycles in shared programs: 334766372 -> 334710124 (-0.02%)
cycles in affected programs: 617548 -> 561300 (-9.11%)
helped: 214
HURT: 2
helped stats (abs) min: 15 max: 1512 x̄: 263.21 x̃: 212
helped stats (rel) min: 0.30% max: 75.36% x̄: 25.30% x̃: 21.58%
HURT stats (abs) min: 40 max: 40 x̄: 40.00 x̃: 40
HURT stats (rel) min: 0.15% max: 0.15% x̄: 0.15% x̃: 0.15%
95% mean confidence interval for cycles value: -277.91 -242.90
95% mean confidence interval for cycles %-change: -27.58% -22.55%
Cycles are helped.
No spill/fill changes or gained/lost
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4627>
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| 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 gitlab for patches submission, review and discussions.