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fuchsia / third_party / libyuv / 776a509891796d07006d2aedfe40e26b1075b026
commit776a509891796d07006d2aedfe40e26b1075b026[log] [tgz]
authorGeorge Steed <george.steed@arm.com>Wed May 15 21:26:24 2024 +0100
committerFrank Barchard <fbarchard@chromium.org>Fri Jul 19 19:51:45 2024 +0000
treedce5565ba0394900e0b4c81d63cd27b1273589e2
parentbe5de19db32f6191f2533d0fa69166e89ea60915 [diff]
[AArch64] Unroll ScaleRowDown34_1_Box_NEON

We can make use of wider instructions for the loads and stores as well
as the URHADD instructions. In addition the duplicated instructions of
the code from the unrolling provides a further small improvement for
little cores with limited out-of-order capability.

Reduction in runtimes observed compared to the existing Neon
implementation:

 Cortex-A55: -23.5%
Cortex-A510: -35.4%
Cortex-A520: -40.5%
 Cortex-A76: -15.1%
Cortex-A715:  -6.2%
Cortex-A720:  -6.2%
  Cortex-X1: -17.9%
  Cortex-X2: -18.4%
  Cortex-X3: -18.3%
  Cortex-X4: -14.0%

Bug: b/42280945
Change-Id: I5905e026a0507870bfc580b702906d6acb4ed6f4
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5725170
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
2 files changed
tree: dce5565ba0394900e0b4c81d63cd27b1273589e2
  1. build_overrides/
  2. docs/
  3. include/
  4. infra/
  5. riscv_script/
  6. source/
  7. tools_libyuv/
  8. unit_test/
  9. util/
  10. .clang-format
  11. .gitignore
  12. .gn
  13. .vpython
  14. .vpython3
  15. Android.bp
  16. Android.mk
  17. AUTHORS
  18. BUILD.gn
  19. CM_linux_packages.cmake
  20. CMakeLists.txt
  21. codereview.settings
  22. DEPS
  23. DIR_METADATA
  24. download_vs_toolchain.py
  25. libyuv.gni
  26. libyuv.gyp
  27. libyuv.gypi
  28. LICENSE
  29. linux.mk
  30. OWNERS
  31. PATENTS
  32. PRESUBMIT.py
  33. public.mk
  34. pylintrc
  35. README.chromium
  36. README.md
  37. winarm.mk
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.