cpu.cmake
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# Check for SIMD extensions.
include(CMakePushCheckState)
function(webp_check_compiler_flag WEBP_SIMD_FLAG ENABLE_SIMD)
if(NOT ENABLE_SIMD)
message(STATUS "Disabling ${WEBP_SIMD_FLAG} optimization.")
set(WEBP_HAVE_${WEBP_SIMD_FLAG} 0 PARENT_SCOPE)
return()
endif()
unset(WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG} CACHE)
cmake_push_check_state()
set(CMAKE_REQUIRED_INCLUDES ${CMAKE_CURRENT_SOURCE_DIR})
check_c_source_compiles("
#include \"${CMAKE_CURRENT_LIST_DIR}/../src/dsp/dsp.h\"
int main(void) {
#if !defined(WEBP_USE_${WEBP_SIMD_FLAG})
this is not valid code
#endif
return 0;
}
" WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG})
cmake_pop_check_state()
if(WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG})
set(WEBP_HAVE_${WEBP_SIMD_FLAG} 1 PARENT_SCOPE)
else()
set(WEBP_HAVE_${WEBP_SIMD_FLAG} 0 PARENT_SCOPE)
endif()
endfunction()
# those are included in the names of WEBP_USE_* in c++ code.
set(WEBP_SIMD_FLAGS "SSE41;SSE2;MIPS32;MIPS_DSP_R2;NEON;MSA")
set(WEBP_SIMD_FILE_EXTENSIONS
"_sse41.c;_sse2.c;_mips32.c;_mips_dsp_r2.c;_neon.c;_msa.c")
if(MSVC)
# MSVC does not have a SSE4 flag but AVX support implies SSE4 support.
set(SIMD_ENABLE_FLAGS "/arch:AVX;/arch:SSE2;;;;")
set(SIMD_DISABLE_FLAGS)
else()
set(SIMD_ENABLE_FLAGS
"-msse4.1;-msse2;-mips32;-mdspr2;-mfpu=neon;-mmsa")
set(SIMD_DISABLE_FLAGS
"-mno-sse4.1;-mno-sse2;;-mno-dspr2;;-mno-msa")
endif()
set(WEBP_SIMD_FILES_TO_NOT_INCLUDE)
set(WEBP_SIMD_FILES_TO_INCLUDE)
set(WEBP_SIMD_FLAGS_TO_INCLUDE)
if(${ANDROID})
if(${ANDROID_ABI} STREQUAL "armeabi-v7a")
# This is because Android studio uses the configuration "-march=armv7-a
# -mfloat-abi=softfp -mfpu=vfpv3-d16" that does not trigger neon
# optimizations but should (as this configuration does not exist anymore).
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=neon ")
endif()
endif()
list(LENGTH WEBP_SIMD_FLAGS WEBP_SIMD_FLAGS_LENGTH)
math(EXPR WEBP_SIMD_FLAGS_RANGE "${WEBP_SIMD_FLAGS_LENGTH} - 1")
unset(HIGHEST_SSE_FLAG)
foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
list(GET WEBP_SIMD_FLAGS ${I_SIMD} WEBP_SIMD_FLAG)
# First try with no extra flag added as the compiler might have default flags
# (especially on Android).
unset(WEBP_HAVE_${WEBP_SIMD_FLAG} CACHE)
cmake_push_check_state()
set(CMAKE_REQUIRED_FLAGS)
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
if(NOT WEBP_HAVE_${WEBP_SIMD_FLAG})
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
set(CMAKE_REQUIRED_FLAGS ${SIMD_COMPILE_FLAG})
webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
else()
if(MSVC)
list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
else()
set(SIMD_COMPILE_FLAG " ")
endif()
endif()
# Check which files we should include or not.
list(GET WEBP_SIMD_FILE_EXTENSIONS ${I_SIMD} WEBP_SIMD_FILE_EXTENSION)
file(GLOB SIMD_FILES "${CMAKE_CURRENT_LIST_DIR}/../"
"src/dsp/*${WEBP_SIMD_FILE_EXTENSION}")
if(WEBP_HAVE_${WEBP_SIMD_FLAG})
if(${I_SIMD} LESS 2 AND NOT HIGHEST_SSE_FLAG)
set(HIGHEST_SSE_FLAG ${SIMD_COMPILE_FLAG})
endif()
# Memorize the file and flags.
foreach(FILE ${SIMD_FILES})
list(APPEND WEBP_SIMD_FILES_TO_INCLUDE ${FILE})
if(${I_SIMD} LESS 2)
list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${HIGHEST_SSE_FLAG})
else()
list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${SIMD_COMPILE_FLAG})
endif()
endforeach()
else()
# Remove the file from the list.
foreach(FILE ${SIMD_FILES})
list(APPEND WEBP_SIMD_FILES_NOT_TO_INCLUDE ${FILE})
endforeach()
# Explicitly disable SIMD.
if(SIMD_DISABLE_FLAGS)
list(GET SIMD_DISABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
include(CheckCCompilerFlag)
if(SIMD_COMPILE_FLAG)
unset(HAS_COMPILE_FLAG CACHE)
check_c_compiler_flag(${SIMD_COMPILE_FLAG} HAS_COMPILE_FLAG)
if(HAS_COMPILE_FLAG)
# Do one more check for Clang to circumvent CMake issue 13194.
if(COMMAND check_compiler_flag_common_patterns)
# Only in CMake 3.0 and above.
check_compiler_flag_common_patterns(COMMON_PATTERNS)
else()
set(COMMON_PATTERNS)
endif()
set(CMAKE_REQUIRED_DEFINITIONS ${SIMD_COMPILE_FLAG})
check_c_source_compiles("int main(void) {return 0;}"
FLAG_${SIMD_COMPILE_FLAG}
FAIL_REGEX
"warning: argument unused during compilation:"
${COMMON_PATTERNS})
if(NOT FLAG_${SIMD_COMPILE_FLAG})
unset(HAS_COMPILE_FLAG CACHE)
endif()
endif()
if(HAS_COMPILE_FLAG)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SIMD_COMPILE_FLAG}")
endif()
endif()
endif()
endif()
cmake_pop_check_state()
endforeach()