Georg Lehmann 46a4569c22 nir/opt_undef: prefer 0 over NaN for pack_half_2x16_rtz_split
Using NaN doesn't usually allow any extra optimizations, and 0 is an inline
constant on AMD hw where this opcode is used with undef for fragment shader
exports.

Foz-DB GFX1201:
Totals from 889 (1.11% of 80287) affected shaders:
Instrs: 1676365 -> 1676348 (-0.00%)
CodeSize: 8827040 -> 8821760 (-0.06%)
Latency: 13346728 -> 13346699 (-0.00%)
InvThroughput: 1799283 -> 1799262 (-0.00%)
Copies: 108125 -> 108102 (-0.02%)
VALU: 974875 -> 974852 (-0.00%)

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37552>
2025-09-26 15:11:26 +00:00
2025-02-23 00:31:59 +01:00
2025-09-26 14:02:52 +00:00
2025-01-08 20:37:51 +00:00
2023-11-02 11:37:46 +00:00
2025-09-16 19:45:15 +00:00
2025-08-31 15:38:27 +00:00
2024-11-18 22:29:14 +00:00
2025-07-16 13:50:24 +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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