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Jason Ekstrand 374f82ba72 intel/nir: Don't try to emit vector load_scratch instructions 
In 53bfcdeecf, we added load/store_scratch instructions which deviate
a little bit from most memory load/store instructions in that we can't
use the normal untyped read/write instructions which can read and write
up to a vec4 at a time.  Instead, we have to use the DWORD scattered
read/write instructions which are scalar.  To handle this, we added code
to brw_nir_lower_mem_access_bit_sizes to cause them to be scalarized.
However, one case was missing: the load-as-larger-vector case.  In this
case, we take small bit-sized constant-offset loads replace it with a
32-bit load and shuffle the result around as needed.

For scratch, this case is much trickier to get right because it often
emits vec2 or wider which we would then have to lower again.  We did
this for other load and store ops because, for lower bit-sizes we have
to scalarize thanks to the byte scattered read/write instructions being
scalar.  However, for scratch we're not losing as much because we can't
vectorize 32-bit loads and stores either.  It's easier to just disallow
it whenever we have to scalarize.

Fixes: 53bfcdeecf "intel/fs: Implement the new load/store_scratch..."
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6872>
(cherry picked from commit fd04f858b0)
2020-10-12 10:02:44 -07:00
.appveyor appveyor: Use Python3. 2020-08-06 09:46:48 +00:00
.gitlab/issue_templates gitlab: Ask about reproduction rate in the issue template 2020-05-20 10:20:00 +00:00
.gitlab-ci ci: Use ignore_scheduled_pipelines anchor in .radeonsi-rules 2020-09-24 09:32:14 -07:00
bin pick-ui: specify git commands in "resolve cherry pick" message 2020-08-11 09:35:47 -07:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs docs: Add sh256 sums for 20.2.0 2020-09-28 16:29:08 -07:00
doxygen doxygen: Plumb through gallium/ to automated documentation 2016-05-30 17:53:45 +01:00
include ci: Include enough Android headers to let us compile test EGL 2020-08-05 18:08:07 +00:00
scons scons/windows: Support build with LLVM 10. 2020-04-14 08:40:56 +00:00
src intel/nir: Don't try to emit vector load_scratch instructions 2020-10-12 10:02:44 -07:00
subprojects meson: use github URL for wraps instead of completely unreliable wrapdb 2020-01-16 23:06:43 +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 meson: bump required glvnd version 2020-08-11 09:35:50 -07:00
.mailmap .mailmap: add an alias for Andres Gomez 2020-04-30 14:33:20 +03:00
.pick_status.json intel/nir: Don't try to emit vector load_scratch instructions 2020-10-12 10:02:44 -07:00
.travis.yml travis: autodetect python version instead of hard-coding it 2019-12-21 20:23:08 +00:00
Android.common.mk tree-wide: fix deprecated GitLab URLs 2020-05-23 15:33:50 +00:00
Android.mk ac/llvm: handle static/shared llvm init separately 2020-08-18 07:32:07 -07:00
appveyor.yml appveyor: Use Python3. 2020-08-06 09:46:48 +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 meson: fix power8 option 2020-10-05 11:27:29 -07:00
meson_options.txt ci: Include enough Android headers to let us compile test EGL 2020-08-05 18:08:07 +00:00
README.rst README: update references to internal docs 2020-06-13 10:42:01 +00:00
REVIEWERS REVIEWERS: add VMware reviewers 2019-10-18 16:42:40 +00:00
SConstruct tree-wide: fix deprecated GitLab URLs 2020-05-23 15:33:50 +00:00
VERSION VERSION: bump for 20.2.0 release 2020-09-28 15:50:54 -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.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.