介紹

NEON，即“ARM Advanced SIMD”，是ARM從ARMv7開始提供的高級單指令多數(shù)據(jù)(SIMD)擴(kuò)展。它是一種64/128位混合SIMD體系結(jié)構(gòu)。NEON在網(wǎng)上的資料比較少，對于新手來說不太友好。一番折騰之后，終于在GIT上找到一個(gè)封裝好的NEON庫，Ne10，內(nèi)部用匯編實(shí)現(xiàn)了若干基本運(yùn)算。

Git地址

安裝指南

預(yù)備

先安裝arm-linux交叉編譯器：

sudo apt-get install gcc-arm-linux-gnueabihf

sudo apt-get install g++-arm-linux-gnueabihf

否則，會出現(xiàn)編譯錯(cuò)誤

cc: error: unrecognized command line option ‘-mthumb-interwork’ cc: error: unrecognized command line option ‘-mthumb’ cc: error: unrecognized command line option ‘-mfpu=vfp3’

作為小白的我不知所以，抓狂很久，直到看到根目錄下的GNUlinux_config.cmake才恍然大誤大悟。
關(guān)于abi的介紹，可參考這篇博客
交叉編譯器。

編譯

Native compilation on *nix platforms

編譯命令

cd $NE10_PATH # Change directory to the location of the Ne10 source mkdir build && cd build # Create the `build` directory and navigate into it export NE10_LINUX_TARGET_ARCH=armv7 # Set the target architecture (can also be "aarch64") cmake -DGNULINUX_PLATFORM=ON .. # Run CMake to generate the build files make # Build the project

這步總是有問題，找到的編譯器是gcc和g++，而不是gcc-arm-linux-gnueabihf和g++-arm-linux-gnueabihf。

-- Found assembler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works

...Cross compilation on *nix platforms...

編譯命令

cd $NE10_PATH mkdir build && cd build export NE10_LINUX_TARGET_ARCH=armv7 # Can also be "aarch64" cmake -DCMAKE_TOOLCHAIN_FILE=../GNUlinux_config.cmake .. make

這步是ok的。找到了合適的編譯器

-- Found assembler: /usr/bin/arm-linux-gnueabihf-as -- Check for working C compiler: /usr/bin/arm-linux-gnueabihf-gcc -- Check for working C compiler: /usr/bin/arm-linux-gnueabihf-gcc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working CXX compiler: /usr/bin/arm-linux-gnueabihf-g++ -- Check for working CXX compiler: /usr/bin/arm-linux-gnueabihf-g++ -- works

成功編譯。

Linking C static library libNE10.a [ 94%] Built target NE10 Scanning dependencies of target NE10_test_static [ 95%] Building C object samples/CMakeFiles/NE10_test_static.dir/NE10_sample_intro.c.o [ 96%] Building C object samples/CMakeFiles/NE10_test_static.dir/NE10_sample_matrix_multiply.c.o [ 97%] Building C object samples/CMakeFiles/NE10_test_static.dir/NE10_sample_complex_fft.c.o [ 98%] Building C object samples/CMakeFiles/NE10_test_static.dir/NE10_sample_fir.c.o [100%] Building C object samples/CMakeFiles/NE10_test_static.dir/NE10_samples.c.o Linking CXX executable NE10_test_static [100%] Built target NE10_test_static

作者還提到

Additionally, for systems without hardware floating point support, the appropriate compilation options should be added to the CMAKE_C_FLAGS and CMAKE_ASM_FLAGS variables in the root CMakeLists.txt file. For example, -mfloat-abi=softfp -mfpu=neon.

運(yùn)行/build/samples/NE10_test_static出現(xiàn)錯(cuò)誤

bash: ./NE10_test_static: cannot execute binary file: Exec format error

應(yīng)該是32位程序不能運(yùn)行在64位系統(tǒng)上。

64位編譯

編譯64位程序時(shí)（armv7改為aarch64）出現(xiàn)問題

In file included from /home/XXX/Ne10-master/modules/imgproc/NE10_resize.neon.c:28:0: /home/XXX/Ne10-master/modules/imgproc/NE10_resize.neon.c: In function ‘ne10_img_vresize_linear_neon’: /home/XXX/Ne10-master/modules/imgproc/NE10_resize.neon.c:174:19: error: incompatible types when initializing type ‘int32x4_t’ using type ‘int32x2_t’qT_0123 = vmlaq_lane_s32 (qT_0123, qS1_0123, dBeta, 1);

還沒有找到問題所在。

...for Android

編譯命令

cd $NE10_PATH mkdir build && cd build export ANDROID_NDK=/absolute/path/of/android-ndk # Change to your local ndk path export NE10_ANDROID_TARGET_ARCH=armv7 # Can also be "aarch64" cmake -DCMAKE_TOOLCHAIN_FILE=../android/android_config.cmake .. make

找到編譯器

-- Found assembler: /home/XXX/android-ndk-r13b//toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-as -- Detecting C compiler ABI info -- Detecting C compiler ABI info - failed -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - failed -- Target architecture: armv7 -- Building type: RELEASE -- Loaded toolchain:/home/XXX/android-ndk-r13b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc/home/XXX/android-ndk-r13b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++/home/XXX/android-ndk-r13b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-as

成功編譯

Linking C static library libNE10.a Scanning dependencies of target NE10_test_static Linking CXX executable NE10_test_static Scanning dependencies of target NE10_test_demo Linking CXX shared library libNE10_test_demo.so [100%] Built target NE10_test_demo

Android運(yùn)行結(jié)果

將運(yùn)算重復(fù)運(yùn)行十萬次。具體還需要深入理解后再分析。

# Introduction ne10_addc_float: 0.610000 ne10_addc_float_c: 1.863000 ne10_addc_float_neon: 0.652000# Matrix Multiply ne10_mulmat_3x3f: 4.211000 ne10_mulmat_3x3f_c: 7.352000 ne10_mulmat_3x3f_neon: 4.246000

轉(zhuǎn)載于:https://www.cnblogs.com/luyb/p/6492283.html

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