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android / platform / external / libyuv / 48943bb3
commit48943bb378f50c4af98b338f7f282354a16f9507[log] [tgz]
authorFrank Barchard <fbarchard@google.com>Fri Aug 01 16:19:12 2025 -0700
committerFrank Barchard <fbarchard@google.com>Mon Aug 04 12:42:50 2025 -0700
tree977b64273a383c4b28ebea77ba1b071eace71922
parentcdd3bae84818e78466fec1ce954eead8f403d10c [diff]
Convert8To16 use VPSRLW instead of VPMULHUW for better lunarlake performance

- MCA says old version was 4 cycles and new version is 2.5 cycles/loop
- lunarlake is the only known cpu
mca -mcpu=lunarlake 100 iterations

Was vpmulhu
  Iterations:        100
  Instructions:      1200
  Total Cycles:      426
  Total uOps:        1200

  Dispatch Width:    8
  uOps Per Cycle:    2.82
  IPC:               2.82
  Block RThroughput: 4.0

Now vpsrlw
  Iterations:        100
  Instructions:      1200
  Total Cycles:      279
  Total uOps:        1400

  Dispatch Width:    8
  uOps Per Cycle:    5.02
  IPC:               4.30
  Block RThroughput: 2.5

Bug: None
Change-Id: I5a49e1cf1ed3dfb59fe9861a871df9862417c6a6
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/6697745
Reviewed-by: richard winterton <rrwinterton@gmail.com>
5 files changed
tree: 977b64273a383c4b28ebea77ba1b071eace71922
  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. .vpython3
  14. Android.bp
  15. Android.mk
  16. AUTHORS
  17. BUILD.gn
  18. CM_linux_packages.cmake
  19. CMakeLists.txt
  20. codereview.settings
  21. DEPS
  22. DIR_METADATA
  23. download_vs_toolchain.py
  24. libyuv.gni
  25. libyuv.gyp
  26. libyuv.gypi
  27. LICENSE
  28. linux.mk
  29. OWNERS
  30. PATENTS
  31. PRESUBMIT.py
  32. public.mk
  33. pylintrc
  34. README.chromium
  35. README.md
  36. 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.