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232ed89802
Since Gen8+ Intel PRM states that "r127 must not be used for return
address when there is a src and dest overlap in send instruction."
This patch implements this restriction creating new grf127_send_hack_node
at the register allocator. This node has a fixed assignation to grf127.
For vgrf that are used as destination of send messages we create node
interfereces with the grf127_send_hack_node. So the register allocator
will never assign to these vgrf a register that involves grf127.
If dispatch_width > 8 we don't create these interferences to the because
all instructions have node interferences between sources and destination.
That is enough to avoid the r127 restriction.
This fixes CTS tests that raised this issue as they were executed as SIMD8:
dEQP-VK.spirv_assembly.instruction.graphics.8bit_storage.8struct_to_32struct.storage_buffer_*int_geom
Shader-db results on Skylake:
total instructions in shared programs: 7686798 -> 7686797 (<.01%)
instructions in affected programs: 301 -> 300 (-0.33%)
helped: 1
HURT: 0
total cycles in shared programs: 337092322 -> 337091919 (<.01%)
cycles in affected programs: 22420415 -> 22420012 (<.01%)
helped: 712
HURT: 588
Shader-db results on Broadwell:
total instructions in shared programs: 7658574 -> 7658625 (<.01%)
instructions in affected programs: 19610 -> 19661 (0.26%)
helped: 3
HURT: 4
total cycles in shared programs: 340694553 -> 340676378 (<.01%)
cycles in affected programs: 24724915 -> 24706740 (-0.07%)
helped: 998
HURT: 916
total spills in shared programs: 4300 -> 4311 (0.26%)
spills in affected programs: 333 -> 344 (3.30%)
helped: 1
HURT: 3
total fills in shared programs: 5370 -> 5378 (0.15%)
fills in affected programs: 274 -> 282 (2.92%)
helped: 1
HURT: 3
v2: Avoid duplicating register classes without grf127. Let's use a node
with a fixed assignation to grf127 and create interferences to send
message vgrf destinations. (Eric Anholt)
v3: Update reference to CTS VK_KHR_8bit_storage failing tests.
(Jose Maria Casanova)
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: 18.1 <mesa-stable@lists.freedesktop.org>
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| doxygen | ||
| include | ||
| m4 | ||
| scons | ||
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| src | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| meson.build | ||
| meson_options.txt | ||
| README.rst | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
`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 status
------------
Travis:
.. image:: https://travis-ci.org/mesa3d/mesa.svg?branch=master
:target: https://travis-ci.org/mesa3d/mesa
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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.