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Frank Barchard 16af162cf9 [libyuv] Optimize RotatePlane_16 SIMD and compact 32-bit transposes 
Implement SIMD 16-bit plane rotation (TransposePlane_16,
RotatePlane90_16, RotatePlane180_16, RotatePlane270_16) used by
I010Rotate, I210Rotate, and I410Rotate, keeping tile sizes compact
with full-register writes and zero cross-lane shuffles:
- AVX2: 8x16 tile in ymm0..ymm15 with _Any tail (low-end x86 SIMD)
- AVX-512BW: 8x32 tile in zmm0..zmm15 with k1/k2 right/bottom masks
- NEON (ARM64/ARM32): 8x16 tile in v0..v23 / q0..q11 with _Any tail
- SME: 8xVL tile using ZA16 horizontal/vertical array slices
- RVV: 8xVL tile using widening unpacks with hardware vl tail
- WASM SIMD: 8x8 tile in v128 with _Any tail

Also update 32-bit ARGBRotate x86 transposes to compact vertical
in-lane tiles with full-register writes and zero cross-lane shuffles:
- TransposeWxH_32_AVX2: 4x8 tile in ymm0..ymm7 with vpmaskmovd tails
- TransposeWxH_32_AVX512BW: 4x16 tile in zmm0..zmm7 with k1/k2 tails

Add RotatePlane16_SplitMergeUV_Opt and RotatePlane16_SplitMergeUV_Odd
unit tests comparing 16-bit rotation against SplitUVPlane +
RotatePlane + MergeUVPlane across 0/90/180/270 degrees.

Performance on 1275x1650 (1000 iterations, before -> after):
CPU                     90 degree               180 degree
Coral RVV (Verilator)   7306 -> 1415c (5.16x)   2274 -> 719c (3.16x)
AMD Rome (Zen 2)        821 -> 215ms (3.82x)    259 -> 181ms (1.44x)
AMD Genoa (Zen 4)       483 -> 129ms (3.73x)    149 -> 111ms (1.34x)
AMD Turin (Zen 5)       321 -> 101ms (3.18x)    109 -> 78ms (1.40x)
AMD Milan (Zen 3)       505 -> 189ms (2.67x)    199 -> 118ms (1.69x)
Intel Skylake-X         1076 -> 447ms (2.41x)   353 -> 317ms (1.11x)
WASM SIMD (d8)          415 -> 203ms (2.04x)    370 -> 106ms (3.49x)
Intel Emerald Rapids    735 -> 422ms (1.74x)    238 -> 233ms (1.02x)
Intel Haswell           1120 -> 648ms (1.73x)   438 -> 393ms (1.11x)
Intel Ice Lake          774 -> 474ms (1.63x)    279 -> 290ms (0.96x)
ARM Neoverse-N1         864 -> 544ms (1.59x)    404 -> 266ms (1.52x)
Ampere Siryn            862 -> 576ms (1.50x)    568 -> 329ms (1.72x)
Google Axion (Maple)    554 -> 379ms (1.46x)    199 -> 142ms (1.41x)
Intel Sapphire Rapids   1126 -> 772ms (1.46x)   301 -> 288ms (1.04x)
Intel Granite Rapids    730 -> 565ms (1.29x)    280 -> 280ms (1.00x)
NVIDIA Grace            462 -> 365ms (1.26x)    192 -> 126ms (1.52x)
ARM Cortex-A53          28290 -> 24386ms (1.16x) 7178 -> 5075ms (1.41x)
Google Axion 2 (Tamar)  523 -> 453ms (1.15x)    217 -> 112ms (1.93x)

Test: libyuv_unittest --gtest_filter=*Rotate*
Bug: b/42280942
Change-Id: I91ba6cac22185b5d294fcb98344fdb8a23cc94ff
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8545294
Reviewed-by: richard winterton <rrwinterton@gmail.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>
2026-10-12 10:57:34 -07:00
build_overrides [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
docs convert, scale: Add P010/P210/P410 convert paths and NV16/NV24/Px10 scale 2026-09-23 20:43:22 -07:00
include [libyuv] Optimize RotatePlane_16 SIMD and compact 32-bit transposes 2026-10-12 10:57:34 -07:00
infra/config Use default xcode version in libyuv 2025-11-24 07:54:14 -08:00
riscv_script [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -07:00
source [libyuv] Optimize RotatePlane_16 SIMD and compact 32-bit transposes 2026-10-12 10:57:34 -07:00
tools_libyuv Remove libyuv dependency on base/ 2025-01-08 09:04:21 -08:00
unit_test [libyuv] Optimize RotatePlane_16 SIMD and compact 32-bit transposes 2026-10-12 10:57:34 -07:00
util [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
.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 [build] Use hermetic python3 for script_executable in .gn 2026-09-28 06:02:39 -07:00
Android.bp [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
Android.mk [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
AUTHORS Fix same-width vertical point upsampling 2026-08-24 19:28:50 -07:00
BUILD.bazel [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
BUILD.gn [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
CM_linux_packages.cmake Use grep extended regex for version 2024-11-13 02:11:17 +00:00
CMakeLists.txt [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
codereview.settings [infra] remove no longer supported git cl upload setting. 2021-04-28 12:47:52 +00:00
DEPS [build] Use hermetic python3 for script_executable in .gn 2026-09-28 06:02:39 -07:00
DIR_METADATA Move metadata in OWNERS files to DIR_METADATA files 2021-02-09 19:34:43 +00:00
download_vs_toolchain.py Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
GEMINI.md Fix missing inline asm register clobbers 2026-10-08 14:44:23 -07:00
libyuv.bzl [libyuv] Simplify RVV configuration in BUILD.bazel and libyuv.bzl 2026-09-08 17:50:17 -07:00
libyuv.gni [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -07:00
libyuv.gyp Stop setting --dynamic-linker for target_os="android" 2026-05-27 04:34:07 -07:00
libyuv.gypi [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
OWNERS Remove magjed from OWNERS 2026-08-24 10:43:21 -07:00
PATENTS LibYuv: Adding PATENT and LICENSE files 2011-10-25 16:15:49 +00:00
PRESUBMIT.py Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
public.mk use unix line endings 2018-06-20 23:19:59 +00:00
pylintrc Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
README.chromium ARGBToRGB24 AVX512 with tail masking 2026-09-29 16:15:44 -07:00
README.md Update README.md and environment_variables.md for Arm 2024-09-20 00:29:33 +00:00
vpython.toml [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
vpython.toml.uv.lock [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
winarm.mk NV12 Copy, include scale_uv.h 2020-12-08 18:54:16 +00:00
WORKSPACE.bazel Add Bazel build support 2026-04-15 18:20:26 -07:00

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/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.