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fuchsia / third_party / libyuv / e6297afd14dc22c7d2835bae4ae657503d7c2a32
commite6297afd14dc22c7d2835bae4ae657503d7c2a32[log] [tgz]
authorGeorge Steed <george.steed@arm.com>Thu May 16 17:13:30 2024 +0100
committerFrank Barchard <fbarchard@chromium.org>Mon Sep 16 04:28:25 2024 +0000
tree032402c6e1cd926c053f892d1046637f84810b76
parent00886670bbed1e939c09e22e0b9ec067cf93c609 [diff]
[AArch64] Optimize ScaleARGBRowDown2Linear_NEON

Replace LD4 with a pair of LD2 instructions to avoid needing an ST2
instruction for storing the result, since ST2 instructions are known to
be slow on some micro-architectures.

Observed reduction in runtimes compared to the existing Neon code:

 Cortex-A55: -23.3%
Cortex-A510: -49.6%
Cortex-A520: -31.1%
 Cortex-A76: -44.5%
Cortex-A715: -45.8%
Cortex-A720: -46.0%
  Cortex-X1: -74.5%
  Cortex-X2: -72.4%
  Cortex-X3: -76.8%
  Cortex-X4: -39.5%

Co-authored-by: Cosmina Dunca <cosmina.dunca@arm.com>
Bug: libyuv:976
Change-Id: Iab9e802d0784d69b7e970dcc8f1f4036985cd2e1
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5790972
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
1 file changed
tree: 032402c6e1cd926c053f892d1046637f84810b76
  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.