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Olivia Lee 72e0eda260
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pan/bi: fix memory access alignment
Memory accesses need to be aligned up to the next power of two of the
full access size. Component count and bit-size don't matter to the
hardware, only the total size.

shader-db results are pretty much what you would expect, there are a few
shaders that have increased LS instructions as a result of splitting
accesses to satisfy alignment requirements that were previously ignored.
The one surprising thing is that there are several shaders that have
reduced uniform usage. Looking at some of these individually, what
happened is that splitting UBO loads early allowed the compiler to
eliminate loads from unused ranges of the access.

total instrs in shared programs: 719166 -> 719174 (<.01%)
instrs in affected programs: 2355 -> 2363 (0.34%)
helped: 4
HURT: 6
helped stats (abs) min: 1.0 max: 9.0 x̄: 3.00 x̃: 1
helped stats (rel) min: 0.36% max: 6.52% x̄: 1.99% x̃: 0.54%
HURT stats (abs)   min: 1.0 max: 4.0 x̄: 3.33 x̃: 4
HURT stats (rel)   min: 0.65% max: 2.13% x̄: 1.38% x̃: 1.48%
95% mean confidence interval for instrs value: -2.14 3.74
95% mean confidence interval for instrs %-change: -1.76% 1.82%
Inconclusive result (value mean confidence interval includes 0).

total cycles in shared programs: 30210.83 -> 30218.81 (0.03%)
cycles in affected programs: 50 -> 57.99 (15.97%)
helped: 2
HURT: 6
helped stats (abs) min: 0.0078129999999999589 max: 0.070312000000000041 x̄: 0.04 x̃: 0
helped stats (rel) min: 1.10% max: 10.23% x̄: 5.66% x̃: 5.66%
HURT stats (abs)   min: 0.03125 max: 5.0 x̄: 1.34 x̃: 1
HURT stats (rel)   min: 2.38% max: 25.00% x̄: 13.05% x̃: 14.26%
95% mean confidence interval for cycles value: -0.42 2.41
95% mean confidence interval for cycles %-change: -1.74% 18.49%
Inconclusive result (value mean confidence interval includes 0).

total cvt in shared programs: 2385.91 -> 2385.91 (<.01%)
cvt in affected programs: 11.14 -> 11.14 (<.01%)
helped: 5
HURT: 4
helped stats (abs) min: 0.0078119999999999301 max: 0.070312000000000041 x̄: 0.02 x̃: 0
helped stats (rel) min: 0.27% max: 10.23% x̄: 2.61% x̃: 0.82%
HURT stats (abs)   min: 0.01562600000000014 max: 0.03125 x̄: 0.03 x̃: 0
HURT stats (rel)   min: 1.31% max: 2.75% x̄: 2.21% x̃: 2.40%
95% mean confidence interval for cvt value: -0.02 0.02
95% mean confidence interval for cvt %-change: -3.51% 2.58%
Inconclusive result (value mean confidence interval includes 0).

total ls in shared programs: 25871 -> 25879 (0.03%)
ls in affected programs: 46 -> 54 (17.39%)
helped: 0
HURT: 4
HURT stats (abs)   min: 1.0 max: 5.0 x̄: 2.00 x̃: 1
HURT stats (rel)   min: 10.00% max: 25.00% x̄: 18.38% x̃: 19.26%
95% mean confidence interval for ls value: -1.18 5.18
95% mean confidence interval for ls %-change: 8.46% 28.30%
Inconclusive result (value mean confidence interval includes 0).

total code size in shared programs: 6302848 -> 6302976 (<.01%)
code size in affected programs: 1536 -> 1664 (8.33%)
helped: 0
HURT: 1

total registers used in shared programs: 117324 -> 117329 (<.01%)
registers used in affected programs: 45 -> 50 (11.11%)
helped: 1
HURT: 2
helped stats (abs) min: 1.0 max: 1.0 x̄: 1.00 x̃: 1
helped stats (rel) min: 6.25% max: 6.25% x̄: 6.25% x̃: 6.25%
HURT stats (abs)   min: 2.0 max: 4.0 x̄: 3.00 x̃: 3
HURT stats (rel)   min: 12.50% max: 30.77% x̄: 21.63% x̃: 21.63%

total uniforms used in shared programs: 78538 -> 78274 (-0.34%)
uniforms used in affected programs: 2688 -> 2424 (-9.82%)
helped: 104
HURT: 4
helped stats (abs) min: 1.0 max: 18.0 x̄: 2.65 x̃: 2
helped stats (rel) min: 1.96% max: 54.55% x̄: 12.78% x̃: 11.11%
HURT stats (abs)   min: 1.0 max: 5.0 x̄: 3.00 x̃: 3
HURT stats (rel)   min: 3.70% max: 16.13% x̄: 9.92% x̃: 9.92%
95% mean confidence interval for uniforms used value: -3.01 -1.88
95% mean confidence interval for uniforms used %-change: -14.15% -9.74%
Uniforms used are helped.


Total CPU time (seconds): 73.26 -> 74.48 (1.67%)

Signed-off-by: Olivia Lee <olivia.lee@collabora.com>
Fixes: 2f2738dc90 (pan/bi: Use nir_lower_mem_access_bit_sizes)
Reviewed-by: Eric R. Smith <eric.smith@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41033>
2026-04-29 01:26:47 +00:00
.ci-farms Revert "ci: disable Collabora's farm due to maintenance" 2026-04-20 14:28:04 +00:00
.ci-farms-disabled Revert "ci: disable Collabora's farm due to maintenance" 2026-04-20 14:28:04 +00:00
.github/workflows meson: remove unused osmesa option 2025-06-23 06:42:50 +00:00
.gitlab radv: introduce RADV_EXPERIMENTAL envvar for experimental features 2026-03-30 07:27:01 +00:00
.gitlab-ci ci/piglit-traces: Remove ANGLE trace support. 2026-04-23 22:54:12 +00:00
.marge/hooks marge/pipeline_message: print details for any pipeline that hasn't succeeded 2026-02-13 14:44:30 +00:00
android android: fix building rules for i915, r300 2025-10-08 23:43:33 +02:00
bin android_stub: drop cutils/properties dependency 2026-04-28 20:47:36 +00:00
build-support meson: move tsan-blacklist.txt to build-support with the other build support files 2024-05-01 07:05:12 +00:00
docs kk: Fix issues with maximal reconvergence 2026-04-28 18:50:36 +00:00
include android_stub: drop cutils/properties dependency 2026-04-28 20:47:36 +00:00
licenses licenses: add missing licenses 2025-01-08 20:37:51 +00:00
src pan/bi: fix memory access alignment 2026-04-29 01:26:47 +00:00
subprojects ci: Bump DirectX-Headers and Agility SDK dependencies to v1.619.1 2026-03-10 15:06:44 +00:00
.clang-format meson: Restore .clang-format for ninja clang-format target 2026-02-02 13:30:55 +00:00
.clang-format-ignore ethosu: Switch to the weight encoder from Regor 2026-03-23 07:45:55 +00:00
.clang-format-include ethos: Initial commit of a driver for the Arm Ethos-U65 NPU. 2025-10-15 20:10:15 +00:00
.dir-locals.el
.editorconfig editorconfig: Set for glsl files 2025-11-14 19:31:17 +00:00
.git-blame-ignore-revs radv: Add re-format commit to .git-blame-ignore-revs 2025-11-12 07:55:36 +00:00
.gitattributes gitlab: Highlight .cl as C 2023-11-02 11:37:46 +00:00
.gitignore Revert "add VK CTS validation report for a0 interpolation fix" 2026-02-10 18:07:18 +00:00
.gitlab-ci.yml ci: changing .gitlab-ci.yml itself also means the container jobs must exist 2026-03-18 14:19:02 +00:00
.graphqlrc.yml
.mailmap mailmap: Update my email 2026-03-12 23:36:00 +00:00
.mr-label-maker.yml mr-label-maker: Label Collabora farm with driver tags 2026-04-20 15:20:28 +00:00
.shellcheckrc ci: move shellcheck options to .shellcheckrc 2024-10-24 22:43:03 +00:00
clippy.toml ci: read the MSRV from clippy.toml to avoid having too many copies to keep in sync 2025-12-20 00:13:19 +01:00
CODEOWNERS CODEOWNERS: update owners for Android components 2026-04-28 21:42:34 +00:00
meson.build kk: Add poly dependency to KK 2026-04-17 10:52:53 +00:00
meson.options amd: make ac_ib_parser an amd tool build option 2026-04-17 09:40:13 +00:00
README.rst docs: Match README installation guide with meson.rst 2024-07-27 11:53:53 +00:00
rustfmt.toml mesa: Add rustfmt.toml 2024-11-18 22:29:14 +00:00
VERSION VERSION: bump to 26.2 2026-04-15 13:15:35 +00:00

`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.