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Jason Ekstrand 2fca325ea6 Revert "i965/fs: Merge CMP and SEL into CSEL on Gen8+" 
This reverts commit 52c7df1643.  The pass,
while clearly useful for some shaders, has at least three bugs that I
was able to find fairly quickly:

 1. It doesn't work for type-converting MOVs because f > 0 is not the
    same as f2i(f) > 0

 2. CSEL is a 3src instruction and only supports one source type; it
    doesn't take this into account and tries to create instructions
    which do a F compare and a D select.  This is especially nasty to
    debug because you don't see that in the dumped assembly because we
    don't properly assert that types are the same in codegen.

 3. While you can handle 2, in theory, by reinterpreting types, you
    can't do that in the presence of source modifiers.  This pass
    doesn't even attempt to detect that.

Those are just the ones I found with the one almost trival shader I was
debugging.  There very likely may be more and.  Best thing to do for now
is just shut it off until someone has the time to figure out how to do
this properly and write tests to ensure it's correct.

Fixes: 3cb085e6d61a "i965/fs: Merge CMP and SEL into CSEL on Gen8+"
Reviewed-by: Brian Paul <brianp@vmware.com>
2019-11-20 20:47:32 +00:00
.appveyor Appveyor: Quickly fix meson build. 2019-11-14 21:45:23 +00:00
.gitlab-ci gitlab-ci: Fix dir name for VK-GL-CTS sources 2019-11-20 08:03:44 +01:00
bin meson: add windows support to symbols checks 2019-11-05 20:31:37 +00:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs docs/release-calendar: Update for extended 19.3 rc period 2019-11-20 09:57:05 -08:00
doxygen doxygen: Plumb through gallium/ to automated documentation 2016-05-30 17:53:45 +01:00
include egl: use EGL_CAST() macro in eglmesaext.h 2019-11-19 22:00:24 +00:00
scons mesa/imports: let the build system detect strtok_r() 2019-11-05 22:38:04 +00:00
src Revert "i965/fs: Merge CMP and SEL into CSEL on Gen8+" 2019-11-20 20:47:32 +00:00
subprojects meson: add a expat subproject 2019-09-10 20:36:47 +00:00
.dir-locals.el dir-locals.el: Adds White Space support 2016-11-14 19:17:49 +02:00
.editorconfig editorconfig: Fix meson style 2019-05-24 18:44:18 +00:00
.gitignore intel/tools: Add unit tests for assembler 2019-05-07 14:33:48 -07:00
.gitlab-ci.yml gitlab-ci: bump piglit checkout commit 2019-11-20 05:05:56 +00:00
.mailmap .mailmap: add a couple of aliases for Jakob Bornecrantz 2019-10-03 17:11:20 -04:00
.travis.yml travis: fix scons build after deprecation warning 2019-10-29 09:25:40 +00:00
Android.common.mk android: mesa: Revert "android: mesa: revert "Enable asm unconditionally"" 2019-11-12 18:09:43 +00:00
Android.mk android: mesa: Revert "android: mesa: revert "Enable asm unconditionally"" 2019-11-12 18:09:43 +00:00
appveyor.yml Appveyor: Quickly fix meson build. 2019-11-14 21:45:23 +00:00
CleanSpec.mk CleanSpec.mk: Remove HOST_OUT_release 2018-08-02 15:42:40 -06:00
common.py scons: Print a deprecation warning about using scons on not windows 2019-10-24 18:33:50 +00:00
meson.build util: Use ZSTD for shader cache if possible 2019-11-11 18:53:45 +00:00
meson_options.txt util: Use ZSTD for shader cache if possible 2019-11-11 18:53:45 +00:00
README.rst README: Drop the badges from the readme 2019-02-07 12:46:17 -06:00
REVIEWERS REVIEWERS: add VMware reviewers 2019-10-18 16:42:40 +00:00
SConstruct scons: Fix force_scons parsing. 2019-10-26 08:23:48 +01:00
VERSION Bump VERSION to 20.0.0-devel 2019-10-30 14:56:02 -07:00

README.rst 

`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 email mailing-lists for patches submission, review and
discussions.