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ximgproc: optimize guidedfilter function for ARM64 using NEON intrinsics #3979
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/usr/bin/ccache /usr/bin/c++ -DCVAPI_EXPORTS -D_USE_MATH_DEFINES -D__OPENCV_BUILD=1 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/ci/opencv/hal/ipp/include -I3rdparty/ippicv/ippicv_lnx/icv/include -I3rdparty/ippicv/ippicv_lnx/iw/include -I/home/ci/opencv/3rdparty/dlpack/include -I/home/ci/opencv_contrib/modules/ximgproc/include -Imodules/ximgproc -I/home/ci/opencv/modules/core/include -I/home/ci/opencv/modules/flann/include -I/home/ci/opencv/modules/imgproc/include -I/home/ci/opencv/modules/dnn/include -I/home/ci/opencv/modules/features2d/include -I/home/ci/opencv/modules/imgcodecs/include -I/home/ci/opencv/modules/calib3d/include -I/home/ci/opencv/modules/video/include -isystem . -isystem /usr/include/eigen3 -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG -fPIC -std=c++11 -MD -MT modules/ximgproc/CMakeFiles/opencv_ximgproc.dir/src/edgeaware_filters_common.cpp.o -MF modules/ximgproc/CMakeFiles/opencv_ximgproc.dir/src/edgeaware_filters_common.cpp.o.d -o modules/ximgproc/CMakeFiles/opencv_ximgproc.dir/src/edgeaware_filters_common.cpp.o -c /home/ci/opencv_contrib/modules/ximgproc/src/edgeaware_filters_common.cpp
/home/ci/opencv_contrib/modules/ximgproc/src/edgeaware_filters_common.cpp:64:2: error: #endif without #if
64 | #endif
| ^~~~~
/home/ci/opencv_contrib/modules/ximgproc/src/edgeaware_filters_common.cpp:63:1: error: expected declaration before '}' token
63 | } // end
| ^
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imageI agree to contribute to the project under Apache 2 License.
To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
The PR is proposed to the proper branch
This PR introduces an ARM64-specific optimization for the add_mul function in edgeaware_filters_common.cpp using NEON intrinsics.
The optimization is applied only when CV_NEON is defined and the runtime NEON check (cv::checkHardwareSupport(CV_CPU_NEON)) passes.
The SIMD implementation leverages NEON instructions (vld1q_f32, vmulq_f32, vaddq_f32, vst1q_f32) to accelerate the fused multiply-add operation on 4-element float vectors.
This brings parity with existing x64 SIMD optimizations using SSE1.
The addition of the ARM64 NEON optimization for the add_mul function in edgeaware_filters_common.cpp has led to performance improvements in some tests of GuidedFilter function.