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101 lines
3.0 KiB
101 lines
3.0 KiB
2 years ago
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# This script checks for the highest level of FMA support on the host
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# by compiling and running small C++ programs that uses FMA intrinsics.
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#
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# You can invoke this module using the following command:
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#
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# FIND_PACKAGE(FMA [QUIET|REQUIRED])
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#
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# If any FMA support is detected, the following variables are set:
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#
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# FMA_FOUND = 1
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# FMA_FLAGS = compile flags for the version of FMA found
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#
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# If FMA is not supported on the host platform, these variables are
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# not set. If QUIET is true, the module does not print a message if
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# FMA if missing. If REQUIRED is true, the module produces a fatal
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# error if FMA support is missing.
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#
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set(FMA_FLAGS)
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set(FMA_FOUND)
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set(DETECTED_FMA)
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if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
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execute_process(COMMAND ${CMAKE_CXX_COMPILER} "-dumpversion" OUTPUT_VARIABLE GCC_VERSION_STRING)
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if(GCC_VERSION_STRING VERSION_GREATER 4.2 AND NOT APPLE AND NOT CMAKE_CROSSCOMPILING)
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SET(FMA_FLAGS "${FMA_FLAGS} -march=native")
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message(STATUS "Using CPU native flags for FMA optimization: ${FMA_FLAGS}")
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endif()
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endif()
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include(CheckCXXSourceRuns)
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set(CMAKE_REQUIRED_FLAGS)
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# Generate a list of FMA versions to test.
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set(_FMA_TEST 1)
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# Check for FMA support.
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if(_FMA_TEST)
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if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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set(CMAKE_REQUIRED_FLAGS "-mavx2 -mfma")
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
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set(CMAKE_REQUIRED_FLAGS "-fma")
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elseif(MSVC AND NOT CMAKE_CL_64)
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set(CMAKE_REQUIRED_FLAGS "/arch:AVX2")
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endif()
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check_cxx_source_runs("
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#include <immintrin.h>
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int main()
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{
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__m256d a = _mm256_set_pd (-1, 2, -3, 4);
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__m256d b = _mm256_set_pd (-2, 3, -4, 1);
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__m256d c = _mm256_set_pd (-11, 6, 4, -1);
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__m256d result = _mm256_fmsub_pd (a, b, c);
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return 0;
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}" DETECTED_FMA)
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endif()
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set(CMAKE_REQUIRED_FLAGS)
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if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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if(DETECTED_FMA)
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SET(FMA_FLAGS "${FMA_FLAGS} -mfma")
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SET(FMA_FOUND 1)
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endif()
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elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
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if(DETECTED_FMA)
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SET(FMA_FLAGS "${FMA_FLAGS} -fma")
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SET(FMA_FOUND 1)
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endif()
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elseif(MSVC)
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if(DETECTED_FMA)
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SET(FMA_FLAGS "${FMA_FLAGS} /arch:AVX2")
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SET(FMA_FOUND 1)
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endif()
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endif()
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if(FMA_FOUND)
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message(STATUS " Found FMA extensions, using flags: ${FMA_FLAGS}")
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else()
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message(STATUS " No FMA support found")
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set(FMA_FLAGS "")
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endif()
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set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${FMA_FLAGS}")
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set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${FMA_FLAGS}")
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set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${FMA_FLAGS}")
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return()
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#-----------------------
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# If no FMA support is found, print an error message.
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if(FMA_FIND_REQUIRED)
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set(_FMA_ERROR_MESSAGE "FMA support is not found on this architecture")
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endif()
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if(FMA_FIND_REQUIRED)
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message(FATAL_ERROR "${_FMA_ERROR_MESSAGE}")
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elseif(NOT FMA_FIND_QUIETLY)
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message(STATUS "${_FMA_ERROR_MESSAGE}")
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endif()
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