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fuchsia / third_party / libyuv / 5c12e0b2de33e9a3031526c1f392cc0d11d49f5f
commit5c12e0b2de33e9a3031526c1f392cc0d11d49f5f[log] [tgz]
authorGeorge Steed <george.steed@arm.com>Tue May 07 13:26:07 2024 +0100
committerFrank Barchard <fbarchard@chromium.org>Thu Nov 07 18:53:00 2024 +0000
treed27b4ade9d05bbbad61d0d2d02810c5d050036a7
parent7d383c2f1a11957c6cc71c2856d498f3e8819de5 [diff]
[AArch64] Add SVE2 implementations of HalfFloat{,1}Row

For HalfFloat1Row, SVE has direct 16-bit integer to half-float
conversion instructions so there is no need to widen to 32-bits.

For HalfFloatRow, SVE zero-extending loads avoid the need for seperate
UXTL(2) instructions.

Observed reductions in runtime compared to the existing Neon code:

            | HalfFloat1Row | HalfFloatRow
Cortex-A510 |        -38.3% |       -17.3%
Cortex-A520 |        -37.6% |       -18.8%
Cortex-A720 |        -50.1% |        -7.8%
  Cortex-X2 |        -50.2% |        -0.4%
  Cortex-X4 |        -51.5% |       -12.5%

Bug: b/42280942
Change-Id: I445071ccd453113144ce42d465ba03c9ee89ec9e
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5975319
Reviewed-by: Justin Green <greenjustin@google.com>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
3 files changed
tree: d27b4ade9d05bbbad61d0d2d02810c5d050036a7
  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/SVE2/SME 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.