Mesa 3D graphics library
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Marcin Ślusarz a6ec00134e glsl/opt_algebraic: disable invalid optimization
When operators other than eq and ne are involved we can't really
move operands around and negate them because such transformation
may change the value of the whole expression.

Some examples:

For unsigned var:
0 >= 1u + var would eventually become 0xffffffff >= var,
which would always evaluate to true, when original expression
was true only for var == 0xffffffff.

For signed var:
0 >= 1 + var would become -1 >= var, which would evaluate to
false for var == 2147483647, when original expression evaluated
to true (because signed overflow is defined to wrap around in
glsl, 1 + 2147483647 == -2147483648, so 0 >= -2147483648).

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5226
Fixes: 34ec1a24d6 ("glsl: Optimize (x + y cmp 0) into (x cmp -y).")
Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12359>
(cherry picked from commit 89bc8ff408)
2021-09-07 20:08:47 +01:00
.gitlab/issue_templates gitlab: rename RADV bug report template 2021-04-01 10:02:39 +00:00
.gitlab-ci Fix up leftover "state_trackers" references to "frontends" 2021-07-13 09:58:56 +01:00
bin pick-ui: show commit date 2021-08-10 22:40:38 +01:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs docs: add release notes for 21.1.7 2021-08-11 20:20:54 +01:00
doxygen doxygen: Plumb through gallium/ to automated documentation 2016-05-30 17:53:45 +01:00
include intel: Add 2 ADL-S pci-ids 2021-05-18 23:02:26 +02:00
src glsl/opt_algebraic: disable invalid optimization 2021-09-07 20:08:47 +01:00
subprojects d3d12: Use DirectX-Headers wrap for d3d12.h 2020-12-16 16:25:54 +00:00
.dir-locals.el dir-locals.el: Adds White Space support 2016-11-14 19:17:49 +02:00
.editorconfig docs: fixup indentation 2020-01-18 11:39:32 +01:00
.gitignore intel/tools: Add unit tests for assembler 2019-05-07 14:33:48 -07:00
.gitlab-ci.yml ci: Update to latest ci-templates 2021-04-14 13:05:08 +00:00
.mailmap .mailmap: fix email for Daniel Schürmann 2021-03-22 18:56:22 +00:00
.pick_status.json glsl/opt_algebraic: disable invalid optimization 2021-09-07 20:08:47 +01:00
.travis.yml travis: Download XQuartz from GitHub. 2021-06-16 09:06:28 +02:00
Android.common.mk meson, util: Make zlib optional again 2021-03-19 19:33:59 +00:00
Android.mk meson/gallium: Add an option to not use LLVM for gallium draw module 2021-02-25 17:48:16 +00:00
CleanSpec.mk CleanSpec.mk: Remove HOST_OUT_release 2018-08-02 15:42:40 -06:00
meson_options.txt meson: allow egl_native_platform to be specified 2021-07-22 23:05:40 +01:00
meson.build meson: Remove duplicate xvmc in build summary. 2021-09-07 20:08:46 +01:00
README.rst README: update references to internal docs 2020-06-13 10:42:01 +00:00
REVIEWERS Fix up leftover "state_trackers" references to "frontends" 2021-07-13 09:58:56 +01:00
VERSION VERSION: bump for 21.1.7 2021-08-11 20:22:39 +01:00

`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://mesa3d.org/install.html>`_), but the recommended way is to use
Meson (`docs/meson.rst <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.rst <https://mesa3d.org/bugs.html>`_).


Contributing
------------

Contributions are welcome, and step-by-step instructions can be found in our
documentation (`docs/submittingpatches.rst
<https://mesa3d.org/submittingpatches.html>`_).

Note that Mesa uses gitlab for patches submission, review and discussions.