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https://github.com/webmproject/libwebp.git
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64 lines
2.1 KiB
CMake
64 lines
2.1 KiB
CMake
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## Check for SIMD extensions.
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set(WEBP_SIMD_FLAGS "SSE2;SSE41;AVX2")
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set(WEBP_SIMD_FILE_EXTENSIONS "_sse2.c;_sse41.c;_avx2.c")
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if(MSVC)
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# MSVC does not have a SSE4 flag but AVX2 support implies
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# SSE4 support.
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set(SIMD_ENABLE_FLAGS "/arch:SSE2;/arch:AVX2;/arch:AVX2")
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set(SIMD_DISABLE_FLAGS)
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else()
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set(SIMD_ENABLE_FLAGS "-msse2;-msse4.1;-mavx2")
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set(SIMD_DISABLE_FLAGS "-mno-sse2;-mno-sse4.1;-mno-avx2")
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endif()
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set(WEBP_SIMD_FILES_TO_NOT_INCLUDE)
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set(WEBP_SIMD_FILES_TO_INCLUDE)
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set(WEBP_SIMD_FLAGS_TO_INCLUDE)
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list(LENGTH WEBP_SIMD_FLAGS WEBP_SIMD_FLAGS_LENGTH)
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math(EXPR WEBP_SIMD_FLAGS_RANGE "${WEBP_SIMD_FLAGS_LENGTH} - 1")
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foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
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list(GET WEBP_SIMD_FLAGS ${I_SIMD} WEBP_SIMD_FLAG)
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list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
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set(CMAKE_REQUIRED_FLAGS ${SIMD_COMPILE_FLAG})
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check_c_source_compiles("
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#include \"${CMAKE_CURRENT_LIST_DIR}/../src/dsp/dsp.h\"
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int main(void) {
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#if !defined(WEBP_USE_${WEBP_SIMD_FLAG})
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this is not valid code
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#endif
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return 0;
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}
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"
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WEBP_HAVE_${WEBP_SIMD_FLAG}
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)
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# Check which files we should include or not.
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list(GET WEBP_SIMD_FILE_EXTENSIONS ${I_SIMD} WEBP_SIMD_FILE_EXTENSION)
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file(GLOB SIMD_FILES "${CMAKE_CURRENT_LIST_DIR}/../"
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"src/dsp/*${WEBP_SIMD_FILE_EXTENSION}"
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)
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if(WEBP_HAVE_${WEBP_SIMD_FLAG})
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# Memorize the file and flags.
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foreach(FILE ${SIMD_FILES})
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list(APPEND WEBP_SIMD_FILES_TO_INCLUDE ${FILE})
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list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${SIMD_COMPILE_FLAG})
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endforeach()
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else()
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# Remove the file from the list.
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foreach(FILE ${SIMD_FILES})
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list(APPEND WEBP_SIMD_FILES_NOT_TO_INCLUDE ${FILE})
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endforeach()
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# Explicitly disable SIMD.
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if(SIMD_DISABLE_FLAGS)
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list(GET SIMD_DISABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
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include(CheckCCompilerFlag)
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check_c_compiler_flag(${SIMD_COMPILE_FLAG} HAS_COMPILE_FLAG)
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if(HAS_COMPILE_FLAG)
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SIMD_COMPILE_FLAG}")
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endif()
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endif()
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endif()
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endforeach()
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