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Frank Barchard f0a9d6d206 Gaussian reorder for benefit of A73 
Roughly. instead of 4 loads and 8 multiples, use 1 load and 2 multiples
4 times over.  The original code, as with the C code from clang and gcc,
did all the loads, then all the math, then the store.  The new code
does a load, then the math, then the next load, etc.
This schedules better on current arm 64 cpus.
Number of registers also reduced, reusing the same registers.

HiSilicon ARM A73:

Now
TestGaussRow_Opt (890 ms)
TestGaussCol_Opt (571 ms)

Was
TestGaussRow_Opt (1061 ms)
TestGaussCol_Opt (595 ms)

Qualcomm 821 (Pixel):

Now
TestGaussRow_Opt (571 ms)
TestGaussCol_Opt (474 ms)

Was
TestGaussRow_Opt (751 ms)
TestGaussCol_Opt (520 ms)

TBR=kjellander@chromium.org
BUG=libyuv:719
TEST=LibYUVPlanarTest.TestGaussRow_Opt

Reviewed-on: https://chromium-review.googlesource.com/627478
Reviewed-by: Cheng Wang <wangcheng@google.com>
Reviewed-by: Frank Barchard <fbarchard@google.com>
Change-Id: I5ec81191d460801f0d4a89f0384f89925ff036de
Reviewed-on: https://chromium-review.googlesource.com/634448
Commit-Queue: Frank Barchard <fbarchard@google.com>
2017-08-25 19:00:05 +00:00
build_overrides Remove deprecated macOS SDK overrides. 2017-07-20 22:26:41 +00:00
docs Rename convert to yuvconvert to avoid name clash with linux util 2017-04-06 18:58:42 +00:00
include Add MSA optimized ScaleFilterCols, ScaleARGBCols, ScaleARGBFilterCols and ScaleRowDown34 functions 2017-08-18 17:23:27 +00:00
infra/config Remove duplicated bot linux_msan in cq.cfg. 2017-06-01 17:58:16 +00:00
source Gaussian reorder for benefit of A73 2017-08-25 19:00:05 +00:00
tools_libyuv Fix Valgrind by restoring scripts deleted in Chroium. 2017-08-15 08:51:37 +00:00
unit_test Gaussian reorder for benefit of A73 2017-08-25 19:00:05 +00:00
util Revert "include <new> header for benefit of new clang builds" 2017-08-03 22:03:47 +00:00
.clang-format clang-format libyuv 2016-11-07 17:37:23 -08:00
.gitignore Rename convert to yuvconvert to avoid name clash with linux util 2017-04-06 18:58:42 +00:00
.gn Update .gn to set a min SDK for macOS via GN. 2017-07-13 17:34:42 +00:00
all.gyp Android support 2013-11-21 19:57:10 +00:00
Android.mk Fix data races in libyuv::TestCpuFlag(). 2017-05-24 02:09:03 +00:00
AUTHORS Adding AUTHORS file to libyuv 2011-11-01 20:44:21 +00:00
BUILD.gn Change ScaleSumSamples to return Sum of Squares 2017-08-09 22:19:45 +00:00
cleanup_links.py Use DEPS for all dependencies + add PRESUBMIT.py 2017-02-03 11:36:53 +00:00
CM_linux_packages.cmake Add installer builds to cmake for linux 2017-01-26 23:05:17 +00:00
CMakeLists.txt Rename convert to yuvconvert to avoid name clash with linux util 2017-04-06 18:58:42 +00:00
codereview.settings Make Gerrit the default for libyuv code reviews 2017-01-24 18:34:48 +00:00
DEPS win: Rename clang_x64 to win_clang_x64 in build/toolchain/win, step 4/5. 2017-07-25 19:59:42 +00:00
download_vs_toolchain.py Roll chromium_revision 260824:262938 + fix binutils. Since it's not possible to have platform-specific hooks executing, binutils must be downloaded for all platforms in order for the download.py hook to execute properly on non-unix platforms. 2014-04-11 23:40:41 +00:00
gyp_libyuv Skip running GYP if GYP_CHROMIUM_NO_ACTION is set in environment 2016-04-08 14:01:29 +02:00
gyp_libyuv.py Use DEPS for all dependencies + add PRESUBMIT.py 2017-02-03 11:36:53 +00:00
libyuv_nacl.gyp NaCl/GYP: remove references to prep_toolchain from libyuv. prep_toolchain is now a no-op. 2015-04-22 17:42:21 +00:00
libyuv_test.gyp Fix data races in libyuv::TestCpuFlag(). 2017-05-24 02:09:03 +00:00
libyuv.gni Add MIPS SIMD Arch (MSA) optimized MirrorRow function 2016-09-22 16:12:22 -07:00
libyuv.gyp Rename mips source files to dspr2. 2017-01-27 23:11:43 +00:00
libyuv.gypi Rename mips source files to dspr2. 2017-01-27 23:11:43 +00:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
LICENSE_THIRD_PARTY README.chromium license field for WebView and LICENSE_THIRD_PARTY to show files with special licenses. 2013-04-24 00:12:28 +00:00
linux.mk Rename convert to yuvconvert for linux.mk 2017-07-21 19:05:11 +00:00
OWNERS Add new OWNERS and remove drover.properties. 2016-02-16 19:53:11 +01:00
PATENTS LibYuv: Adding PATENT and LICENSE files 2011-10-25 16:15:49 +00:00
PRESUBMIT.py Use DEPS for all dependencies + add PRESUBMIT.py 2017-02-03 11:36:53 +00:00
public.mk Android.mk moved into libyuv to central support 2012-09-19 07:27:17 +00:00
pylintrc Use DEPS for all dependencies + add PRESUBMIT.py 2017-02-03 11:36:53 +00:00
README.chromium Reintroduce the max version of scale 2017-08-14 23:33:56 +00:00
README.md Docs: Fix broken links from README.md 2016-03-15 17:38:14 -07:00
winarm.mk Adds files and functions for rotate any, but does not hook them up to the caller. 2015-07-27 10:32:08 -07:00

README.md

libyuv is an open source project that includes YUV scaling and conversion functionality.

  • Scale YUV to prepare content for compression, with point, bilinear or box filter.
  • Convert to YUV from webcam formats.
  • Convert from YUV to formats for rendering/effects.
  • Rotate by 90/180/270 degrees to adjust for mobile devices in portrait mode.
  • Optimized for SSE2/SSSE3/AVX2 on x86/x64.
  • Optimized for Neon on Arm.
  • Optimized for DSP R2 on Mips.

Development

See [Getting started] 1 for instructions on how to get started developing.

You can also browse the [docs directory] 2 for more documentation.