Ian Romanick 6a19d8915f brw/algebraic: Don't optimize float SEL.CMOD to MOV
Floating point SEL.CMOD may flush denorms to zero. We don't have enough
information at this point in compilation to know whether or not it is
safe to remove that.

Integer SEL or SEL without a conditional modifier is just a fancy
MOV. Those are always safe to eliminate.

See also 3f782cdd25.

Fixes: fab92fa1cb ("i965/fs: Optimize SEL with the same sources into a MOV.")

No shader-db changes on any Intel platform.

fossil-db:

All Intel platforms had similar results. (Lunar Lake shown)
Totals:
Instrs: 209903490 -> 209903492 (+0.00%)
Cycle count: 30546025224 -> 30546021980 (-0.00%); split: -0.00%, +0.00%
Max live registers: 65516231 -> 65516235 (+0.00%)

Totals from 2 (0.00% of 706657) affected shaders:
Instrs: 3197 -> 3199 (+0.06%)
Cycle count: 361650 -> 358406 (-0.90%); split: -10.05%, +9.15%
Max live registers: 300 -> 304 (+1.33%)

Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34192>
2025-04-15 23:59:31 +00:00
2022-11-22 19:04:13 +00:00
2025-02-23 00:31:59 +01:00
2025-04-11 18:35:49 +00:00
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2023-11-02 11:37:46 +00:00
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2025-02-23 00:31:59 +01:00
2024-11-18 22:29:14 +00:00
2025-01-30 19:02:37 +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.
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