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Frank Barchard c28ebdd357 [libyuv] Rewrite LoongArch LSX/LASX kernels in compact inline asm 
Reduce loop unrolling across LoongArch LSX (128-bit) and LASX (256-bit)
row, rotate, and scale kernels to match SSE2/SSSE3 and AVX2 (1-2 vectors
per iteration), rewrite intrinsics/macro implementations into GCC/Clang
inline assembly, update all _Any wrapper masks and IS_ALIGNED dispatch
checks, and port all remaining LSX Convert (+19) and Rotate (+2) kernels
to LASX for full parity:

ISA              | Compare | Convert | Rotate  | Scale
-----------------|---------|---------|---------|--------
MIPS/Loong (Any) |    0    |    68   |    4    |   20
  LSX            |    0    |    68   |    4    |   20
  LASX           |    0    |    68   |    4    |    0

Removes 1,935 macro/helper lines from loongson_intrinsics.h (-99.3%) and
reduces total LoongArch compiled .text size by 9,246 bytes (-24.3%
overall, -36.9% row_lsx.cc, -52.7% scale_lsx.cc, -31.2% rotate_lsx.cc,
-2.8% row_lasx.cc while adding +25 LASX functions):

File               | Before   | After    | Change
-------------------|----------|----------|--------
scale_lsx.cc.o     | 6,102 B  | 2,888 B  | -52.7%
row_lsx.cc.o       | 16,704 B | 10,544 B | -36.9%
rotate_lsx.cc.o    | 1,488 B  | 1,024 B  | -31.2%
row_lasx.cc.o      | 13,168 B | 12,800 B |  -2.8%
rotate_lasx.cc.o   |   544 B  | 1,504 B  | +176.5%
TOTAL .text        | 38,006 B | 28,760 B | -24.3%

R=wtc@google.com, yuanhecai@loongson.cn

Test: qemu-loongarch64 -cpu la464 libyuv_unittest (LASX and LIBYUV_DISABLE_LASX=1)
Change-Id: I11c1143ad2aad0399f10b2c3fc9bc4c02c740c59
2026-10-12 18:39:22 -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] Rewrite LoongArch LSX/LASX kernels in compact inline asm 2026-10-12 18:39:22 -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] Rewrite LoongArch LSX/LASX kernels in compact inline asm 2026-10-12 18:39:22 -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.