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George Steed 188e4e3afb [AArch64] Avoid unnecessary lane-indexed loads in READYUV 
The existing code makes use of a pair of lane-indexed load instructions
to fill the two halves of the input vector, however this has the effect
of introducing an unnecessary dependency on the value of the vector from
the previous loop iteration.

This doesn't really seem to affect little core performance since these
cores never execute enough work concurrently to hit the bottleneck,
however we can improve performance on mid and big cores quite a bit by
using LDR instead of LD1 to load the low lane, zeroing the upper portion
of the vector rather than keeping the previous value.

Reduction in runtime for select kernels (no observed performance delta
on Cortex-A55):

                  Kernel | Cortex-A76 | Cortex-X2
  I422ToARGB4444Row_NEON |     -23.1% |    -49.3%
      I422ToARGBRow_NEON |      -1.2% |     -2.5%
     I422ToRGB24Row_NEON |     -11.7% |     -7.0%
      I422ToRGBARow_NEON |      -4.7% |     -3.4%
 I444AlphaToARGBRow_NEON |      -1.1% |     -2.4%
      I444ToARGBRow_NEON |      -1.6% |     -3.2%
     I444ToRGB24Row_NEON |      -9.6% |     -6.8%

Bug: libyuv:976
Change-Id: I8c9413e0e6ed97b8f060ce42b6e8abdfb77914b9
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5365868
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
2024-03-13 18:35:31 +00:00
build_overrides Define enable_safe_libcxx in build_overrides/build.gni. 2023-05-03 06:08:40 +00:00
docs Add AMXINT8 cpu detect 2024-02-15 21:44:47 +00:00
include Revert "AMX detect OS support for linux kernel" 2024-02-29 00:33:29 +00:00
infra/config infra/config: remove goma property 2023-08-17 06:06:53 +00:00
riscv_script [RISC-V] Support CMake build with custom compiler flags 2023-07-25 09:21:59 +00:00
source [AArch64] Avoid unnecessary lane-indexed loads in READYUV 2024-03-13 18:35:31 +00:00
tools_libyuv Do not roll the Fuchsia SDK. 2023-07-03 09:18:00 +00:00
unit_test Add AMXINT8 cpu detect 2024-02-15 21:44:47 +00:00
util Add AMXINT8 cpu detect 2024-02-15 21:44:47 +00:00
.clang-format clang-format libyuv 2016-11-07 17:37:23 -08:00
.gitignore DetilePlane and unittest for NEON 2022-01-31 20:05:55 +00:00
.gn Roll chromium_revision 829c6df33d..7d683aeda8 (945687:1050091) 2022-09-22 14:56:57 +00:00
.vpython remove swarming_client 2021-09-09 07:11:45 +00:00
.vpython3 Update vpython3 requests 2023-06-01 19:06:40 +00:00
Android.bp Split scale_test and scale_plane_test to allow building on small devices 2023-12-09 18:39:41 +00:00
Android.mk Split scale_test and scale_plane_test to allow building on small devices 2023-12-09 18:39:41 +00:00
AUTHORS Fix compile errors for ARM targets when libyuv_use_neon = false 2022-05-13 10:12:38 +00:00
BUILD.gn Split scale_test and scale_plane_test to allow building on small devices 2023-12-09 18:39:41 +00:00
cleanup_links.py Update PRESUBMIT, cleanup_links and autoroller to py3 2022-02-24 13:34:14 +00:00
CM_linux_packages.cmake Reduce cmake verbosity and update min version 2022-08-03 06:59:54 +00:00
CMakeLists.txt Add cpuid target to CMakeList.txt 2023-12-11 18:45:32 +00:00
codereview.settings [infra] remove no longer supported git cl upload setting. 2021-04-28 12:47:52 +00:00
DEPS [Fuchsia] Add terminal.x64 image to default checkout 2023-09-19 01:50:07 +00:00
DIR_METADATA Move metadata in OWNERS files to DIR_METADATA files 2021-02-09 19:34:43 +00:00
download_vs_toolchain.py Update gclient instructions + environment 2022-02-24 15:19:23 +00:00
libyuv.gni Add GN builds on loongarch platform. 2023-06-19 17:47:05 +00:00
libyuv.gyp Add libyuv.gyp build files 2022-03-21 23:48:16 +00:00
libyuv.gypi Add libyuv.gyp build files 2022-03-21 23:48:16 +00:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk Split convert_test and convert_argb_test to allow building on small systems that run out of memory compiling unittests. 2023-12-08 13:39:56 +00:00
OWNERS add jansson@google.com to infra owners to cover when Mirko is OOO 2022-10-28 09:46:02 +00:00
PATENTS LibYuv: Adding PATENT and LICENSE files 2011-10-25 16:15:49 +00:00
PRESUBMIT.py Update PRESUBMIT, cleanup_links and autoroller to py3 2022-02-24 13:34:14 +00:00
public.mk use unix line endings 2018-06-20 23:19:59 +00:00
pylintrc Use DEPS for all dependencies + add PRESUBMIT.py 2017-02-03 11:36:53 +00:00
README.chromium Revert "AMX detect OS support for linux kernel" 2024-02-29 00:33:29 +00:00
README.md Add RAWToARGBRow_RVV,RAWToRGBARow_RVV,RAWToRGB24Row_RVV 2023-04-07 18:45:08 +00:00
winarm.mk NV12 Copy, include scale_uv.h 2020-12-08 18:54:16 +00:00

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 for compression.
  • Convert to RGB formats for rendering/effects.
  • Rotate by 90/180/270 degrees to adjust for mobile devices in portrait mode.
  • Optimized for SSSE3/AVX2 on x86/x64.
  • Optimized for Neon on Arm.
  • Optimized for MSA on Mips.
  • Optimized for RVV on RISC-V.

Development

See Getting started for instructions on how to get started developing.

You can also browse the docs directory for more documentation.