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Default enable SSE only if compiler supports it #514

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Dec 11, 2020
Merged

Default enable SSE only if compiler supports it #514

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30 changes: 20 additions & 10 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -79,30 +79,40 @@ else()
option(FCL_STATIC_LIBRARY "Whether the FCL library should be static rather than shared" OFF)
endif()

set(SSE_FLAGS "")
if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(SSE_FLAGS -mfpmath=sse -msse -msse2 -msse3 -mssse3)
elseif(MSVC)
# Win64 will add the flag automatically
if(CMAKE_VS_PLATFORM_NAME STREQUAL "Win32")
set(SSE_FLAGS /arch:SSE2)
endif()
endif()

# Whether to enable SSE
if(CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
set(FCL_TARGET_SUPPORT_X64_SSE OFF)
else()
# Does the host support SSE
cmake_host_system_information(RESULT _has_sse QUERY HAS_SSE)
cmake_host_system_information(RESULT _has_sse2 QUERY HAS_SSE2)
if(_has_sse AND _has_sse2)

# Does the compiler support SSE
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("${SSE_FLAGS}" _compiler_supports_sse)

if(_has_sse AND _has_sse2 AND _compiler_supports_sse)
set(FCL_TARGET_SUPPORT_X64_SSE ON)
else()
set(FCL_TARGET_SUPPORT_X64_SSE OFF)
endif()
endif()
set(SSE_FLAGS "")
option(FCL_USE_X64_SSE "Whether FCL should x64 SSE instructions" ${FCL_TARGET_SUPPORT_X64_SSE})
if(FCL_USE_X64_SSE)
if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(SSE_FLAGS -mfpmath=sse -msse -msse2 -msse3 -mssse3)
elseif(MSVC)
# Win64 will add the flag automatically
if(CMAKE_VS_PLATFORM_NAME STREQUAL "Win32")
set(SSE_FLAGS /arch:SSE2)
endif()
endif()
add_compile_options(${SSE_FLAGS})
else()
# Unset SSE_FLAGS so it doesn't get used in subdirectories
set(SSE_FLAGS "")
endif()

option(FCL_USE_HOST_NATIVE_ARCH "Whether FCL should use cflags from the host used to compile" OFF)
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