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Ian Romanick 1711bf6cf2 intel/fs: Generate better code for fsign multiplied by a value 
v2: Rebase on v2 changes in previous two commits.

v3: Rebase on 85c35885b3 ("nir: Rework nir_src_as_alu_instr to not take
a pointer").

shader-db results:

Skylake and Broadwell had similar results. (Skylake shown)
total instructions in shared programs: 15297100 -> 15282141 (-0.10%)
instructions in affected programs: 956685 -> 941726 (-1.56%)
helped: 4527
HURT: 0
helped stats (abs) min: 1 max: 221 x̄: 3.30 x̃: 2
helped stats (rel) min: 0.07% max: 10.53% x̄: 1.85% x̃: 1.37%
95% mean confidence interval for instructions value: -3.48 -3.12
95% mean confidence interval for instructions %-change: -1.88% -1.81%
Instructions are helped.

total cycles in shared programs: 372809551 -> 372597886 (-0.06%)
cycles in affected programs: 13645512 -> 13433847 (-1.55%)
helped: 4362
HURT: 125
helped stats (abs) min: 1 max: 2088 x̄: 50.73 x̃: 28
helped stats (rel) min: 0.01% max: 28.20% x̄: 2.77% x̃: 2.39%
HURT stats (abs)   min: 1 max: 1836 x̄: 76.90 x̃: 28
HURT stats (rel)   min: <.01% max: 34.36% x̄: 3.03% x̃: 1.42%
95% mean confidence interval for cycles value: -50.98 -43.37
95% mean confidence interval for cycles %-change: -2.67% -2.55%
Cycles are helped.

total spills in shared programs: 23465 -> 23463 (<.01%)
spills in affected programs: 42 -> 40 (-4.76%)
helped: 1
HURT: 0

total fills in shared programs: 31766 -> 31763 (<.01%)
fills in affected programs: 69 -> 66 (-4.35%)
helped: 1
HURT: 0

Haswell
total instructions in shared programs: 13839992 -> 13828311 (-0.08%)
instructions in affected programs: 712503 -> 700822 (-1.64%)
helped: 3477
HURT: 0
helped stats (abs) min: 1 max: 221 x̄: 3.36 x̃: 2
helped stats (rel) min: 0.07% max: 10.64% x̄: 1.96% x̃: 1.52%
95% mean confidence interval for instructions value: -3.58 -3.14
95% mean confidence interval for instructions %-change: -2.01% -1.92%
Instructions are helped.

total cycles in shared programs: 387026330 -> 386872483 (-0.04%)
cycles in affected programs: 11329966 -> 11176119 (-1.36%)
helped: 3307
HURT: 139
helped stats (abs) min: 2 max: 1776 x̄: 49.58 x̃: 18
helped stats (rel) min: 0.01% max: 20.38% x̄: 2.27% x̃: 1.79%
HURT stats (abs)   min: 1 max: 2314 x̄: 72.68 x̃: 20
HURT stats (rel)   min: <.01% max: 33.99% x̄: 2.28% x̃: 0.96%
95% mean confidence interval for cycles value: -49.31 -39.98
95% mean confidence interval for cycles %-change: -2.15% -2.01%
Cycles are helped.

LOST:   1
GAINED: 0

Ivy Bridge
total instructions in shared programs: 12045602 -> 12038463 (-0.06%)
instructions in affected programs: 623837 -> 616698 (-1.14%)
helped: 2498
HURT: 0
helped stats (abs) min: 1 max: 39 x̄: 2.86 x̃: 2
helped stats (rel) min: 0.05% max: 10.00% x̄: 1.30% x̃: 1.05%
95% mean confidence interval for instructions value: -2.96 -2.75
95% mean confidence interval for instructions %-change: -1.34% -1.26%
Instructions are helped.

total cycles in shared programs: 181025675 -> 180891323 (-0.07%)
cycles in affected programs: 11329329 -> 11194977 (-1.19%)
helped: 2439
HURT: 47
helped stats (abs) min: 1 max: 1565 x̄: 57.06 x̃: 26
helped stats (rel) min: 0.02% max: 24.56% x̄: 2.02% x̃: 1.64%
HURT stats (abs)   min: 1 max: 1269 x̄: 102.51 x̃: 43
HURT stats (rel)   min: 0.11% max: 52.94% x̄: 4.15% x̃: 1.34%
95% mean confidence interval for cycles value: -59.91 -48.17
95% mean confidence interval for cycles %-change: -1.99% -1.82%
Cycles are helped.

Sandy Bridge, Iron Lake, and GM45 had similar results. (Sandy Bridge shown)
total instructions in shared programs: 10896368 -> 10896339 (<.01%)
instructions in affected programs: 3767 -> 3738 (-0.77%)
helped: 17
HURT: 0
helped stats (abs) min: 1 max: 4 x̄: 1.71 x̃: 1
helped stats (rel) min: 0.13% max: 9.52% x̄: 3.58% x̃: 2.73%
95% mean confidence interval for instructions value: -2.27 -1.14
95% mean confidence interval for instructions %-change: -5.14% -2.03%
Instructions are helped.

total cycles in shared programs: 155091109 -> 155091021 (<.01%)
cycles in affected programs: 47241 -> 47153 (-0.19%)
helped: 15
HURT: 8
helped stats (abs) min: 2 max: 81 x̄: 15.73 x̃: 4
helped stats (rel) min: 0.03% max: 10.59% x̄: 1.55% x̃: 0.71%
HURT stats (abs)   min: 14 max: 32 x̄: 18.50 x̃: 17
HURT stats (rel)   min: 0.32% max: 2.79% x̄: 2.43% x̃: 2.71%
95% mean confidence interval for cycles value: -14.59 6.93
95% mean confidence interval for cycles %-change: -1.41% 1.08%
Inconclusive result (value mean confidence interval includes 0).

Reviewed-by: Matt Turner <mattst88@gmail.com> [v2]
2019-04-18 12:38:05 -07:00
.gitlab-ci gitlab-ci: Use LLVM 3.4 from Debian jessie for scons-llvm job 2019-04-16 10:57:55 +02:00
bin meson: remove meson-created megadrivers symlinks 2019-04-11 12:40:16 +00:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs doc/features: Add a few extensions to the feature matrix 2019-04-16 08:01:13 +00:00
doxygen doxygen: Plumb through gallium/ to automated documentation 2016-05-30 17:53:45 +01:00
include vulkan: Update the XML and headers to 1.1.106 2019-04-15 13:25:43 +00:00
scons scons: Compatibility with Scons development version string 2019-03-12 14:22:34 +00:00
scripts appveyor: Revert commits adding Cygwin support. 2019-01-25 14:13:26 +00:00
src intel/fs: Generate better code for fsign multiplied by a value 2019-04-18 12:38:05 -07:00
.dir-locals.el dir-locals.el: Adds White Space support 2016-11-14 19:17:49 +02:00
.editorconfig editorconfig: Add max_line_length property 2019-01-10 15:50:34 +02:00
.gitattributes Disable autocrlf for Visual Studio project files. 2008-02-28 12:34:01 +09:00
.gitignore .gitignore: list *.orig and *.rej 2017-09-06 17:48:50 +01:00
.gitlab-ci.yml gitlab-ci: Use LLVM 3.4 from Debian jessie for scons-llvm job 2019-04-16 10:57:55 +02:00
.mailmap .mailmap: Add a few more alises for myself 2019-02-13 12:03:41 -08:00
.travis.yml ci: Delete autotools build jobs 2019-04-15 13:44:41 -07:00
Android.common.mk android: fix missing backspace for line continuation 2019-03-08 21:14:24 +00:00
Android.mk android: fix LLVM version string related building errors 2019-04-13 18:56:14 +02:00
appveyor.yml appveyor: Revert commits adding Cygwin support. 2019-01-25 14:13:26 +00:00
CleanSpec.mk CleanSpec.mk: Remove HOST_OUT_release 2018-08-02 15:42:40 -06:00
common.py scons/svga: remove opt from the list of valid build types 2018-10-26 12:09:00 -06:00
meson.build kmsro: Add lima renderonly support 2019-04-11 09:57:53 +08:00
meson_options.txt intel/common: Add unit tests for gen_mi_builder 2019-04-11 18:04:09 +00:00
README.rst README: Drop the badges from the readme 2019-02-07 12:46:17 -06:00
REVIEWERS docs: drop most autoconf references 2019-04-15 13:44:34 -07:00
SConstruct scons: Require python 2.7 2018-08-16 13:52:56 -07:00
VERSION bump version for 19.0 branch 2019-01-29 15:30:25 -08:00

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.