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Jason Ekstrand 134af5ada2 intel/compiler: Don't insert barriers for NULL sources 
Normally, we never see NULL in a source.  However, starting with
eab1c55590, we can with a SHADER_OPCODE_SEND if it only has the first
payload.  We were inserting barriers which adds unnecessary scheduling
dependencies and takes a lot of compile time because inserting a single
barrier is an O(n) operation.

All the extra O(n) can have a surprisingly large effect.  This cuts the
runtime of dEQP-VK.binding_model.buffer_device_address.set3.depth3.
basessbo.convertcheckuv2.store.single.std140.frag by a factor of 20x for
a debug build.

Shader-db results on ICL:

    total instructions in shared programs: 19918983 -> 19921610 (0.01%)
    instructions in affected programs: 884074 -> 886701 (0.30%)
    helped: 1688
    HURT: 817
    helped stats (abs) min: 1 max: 163 x̄: 4.23 x̃: 1
    helped stats (rel) min: 0.02% max: 12.50% x̄: 1.08% x̃: 0.61%
    HURT stats (abs)   min: 1 max: 2674 x̄: 11.95 x̃: 2
    HURT stats (rel)   min: 0.11% max: 70.22% x̄: 1.71% x̃: 1.03%
    95% mean confidence interval for instructions value: -1.97 4.06
    95% mean confidence interval for instructions %-change: -0.28% -0.06%
    Inconclusive result (value mean confidence interval includes 0).

    total cycles in shared programs: 976503324 -> 975884809 (-0.06%)
    cycles in affected programs: 82581703 -> 81963188 (-0.75%)
    helped: 4144
    HURT: 5010
    helped stats (abs) min: 1 max: 79294 x̄: 311.31 x̃: 8
    helped stats (rel) min: <.01% max: 53.69% x̄: 2.00% x̃: 0.51%
    HURT stats (abs)   min: 1 max: 92266 x̄: 134.04 x̃: 8
    HURT stats (rel)   min: <.01% max: 218.09% x̄: 3.25% x̃: 0.53%
    95% mean confidence interval for cycles value: -119.85 -15.29
    95% mean confidence interval for cycles %-change: 0.68% 1.07%
    Inconclusive result (value mean confidence interval and %-change mean confidence interval disagree).

    total spills in shared programs: 10659 -> 12014 (12.71%)
    spills in affected programs: 441 -> 1796 (307.26%)
    helped: 7
    HURT: 12

    total fills in shared programs: 11551 -> 14429 (24.92%)
    fills in affected programs: 993 -> 3871 (289.83%)
    helped: 8
    HURT: 11

    total sends in shared programs: 1025832 -> 1025353 (-0.05%)
    sends in affected programs: 2241 -> 1762 (-21.37%)
    helped: 105
    HURT: 1
    helped stats (abs) min: 1 max: 87 x̄: 4.57 x̃: 2
    helped stats (rel) min: 5.56% max: 54.72% x̄: 11.37% x̃: 10.00%
    HURT stats (abs)   min: 1 max: 1 x̄: 1.00 x̃: 1
    HURT stats (rel)   min: 100.00% max: 100.00% x̄: 100.00% x̃: 100.00%
    95% mean confidence interval for sends value: -7.39 -1.65
    95% mean confidence interval for sends %-change: -12.95% -7.70%
    Sends are helped.

    LOST:   93
    GAINED: 109

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4648
Fixes: eab1c55590 "intel/fs: Support SENDS in SHADER_OPCODE_SEND"
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10412>
2021-04-22 18:00:16 +00:00
.gitlab/issue_templates gitlab: rename RADV bug report template 2021-04-01 10:02:39 +00:00
.gitlab-ci ci: support KHR-GLES testing 2021-04-20 12:39:27 +02:00
bin anv: Remove vkCreateDmaBufINTEL (v4) 2021-04-08 14:15:55 +00:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs docs: update calendar and link releases notes for 21.0.3 2021-04-21 19:32:16 +00:00
doxygen doxygen: Plumb through gallium/ to automated documentation 2016-05-30 17:53:45 +01:00
include vulkan: bump headers/registry to version 1.2.175 2021-04-22 15:34:52 +00:00
src intel/compiler: Don't insert barriers for NULL sources 2021-04-22 18:00:16 +00:00
subprojects meson: Add wrap for libelf on Windows 2021-04-22 10:29:02 +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: support KHR-GLES testing 2021-04-20 12:39:27 +02:00
.mailmap .mailmap: fix email for Daniel Schürmann 2021-03-22 18:56:22 +00:00
.travis.yml scons: Remove. 2021-03-20 10:38:55 +00:00
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.build gallium, va: add support for VASurfaceAttribDRMFormatModifiers 2021-04-22 15:57:29 +00:00
meson_options.txt meson: Increase Android Platform SDK version limit 2021-04-19 21:21:53 +00:00
README.rst README: update references to internal docs 2020-06-13 10:42:01 +00:00
REVIEWERS scons: Remove. 2021-03-20 10:38:55 +00:00
VERSION VERSION: bump to 21.2.0-devel 2021-04-14 21:11:07 +00:00

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.