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FindCPUflags.cmake
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FindCPUflags.cmake
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# Clang or AppleClang (see CMP0025)
if(NOT DEFINED C_CLANG AND CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(C_CLANG 1)
elseif(NOT DEFINED C_GCC AND CMAKE_CXX_COMPILER_ID MATCHES "GNU")
set(C_GCC 1)
elseif(NOT DEFINED C_MSVC AND CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
set(C_MSVC 1)
endif()
# Detect current compilation architecture and create standard definitions
include(CheckSymbolExists)
function(detect_architecture symbol arch)
if (NOT DEFINED ARCHITECTURE)
set(CMAKE_REQUIRED_QUIET 1)
check_symbol_exists("${symbol}" "" ARCHITECTURE_${arch})
unset(CMAKE_REQUIRED_QUIET)
# The output variable needs to be unique across invocations otherwise
# CMake's crazy scope rules will keep it defined
if (ARCHITECTURE_${arch})
set(ARCHITECTURE "${arch}" PARENT_SCOPE)
set(ARCHITECTURE_${arch} 1 PARENT_SCOPE)
add_definitions(-DARCHITECTURE_${arch}=1)
endif()
endif()
endfunction()
# direwolf versions thru 1.5 were available pre-built for 32 bit Windows targets.
# Research and experimentation revealed that the SSE instructions made a big
# difference in runtime speed but SSE2 and later were not significantly better
# for this application. I decided to build with only the SSE instructions making
# the Pentium 3 the minimum requirement. SSE2 would require at least a Pentium 4
# and offered no significant performance advantage.
# These are ancient history - from the previous Century - but old computers, generally
# considered useless for anything else, often end up in the ham shack.
#
# When cmake was first used for direwolf, the default target became 64 bit and the
# SSE2, SSE3, SSE4.1, and SSE4.2 instructions were automatically enabled based on the
# build machine capabilities. This was fine until I tried running the application
# on a computer much older than where it was built. It did not have the SSE4 instructions
# and the application died without a clue for the reason.
# Just how much benefit do these new instructions provide for this application?
#
# These were all run on the same computer, but compiled in different ways.
# Times to run atest with Track 1 of the TNC test CD:
#
# direwolf 1.5 - 32 bit target - gcc 6.3.0
#
# 60.4 sec. Pentium 3 with SSE
#
# direwolf 1.6 - 32 bit target - gcc 7.4.0
#
# 81.0 sec. with no SIMD instructions enabled.
# 54.4 sec. with SSE
# 52.0 sec. with SSE2
# 52.4 sec. with SSE2, SSE3
# 52.3 sec. with SSE2, SSE3, SSE4.1, SSE4.2
# 49.9 sec. Fedora standard: -m32 -march=i686 -mtune=generic -msse2 -mfpmath=sse
# 50.4 sec. sse not sse2: -m32 -march=i686 -mtune=generic -msse -mfpmath=sse
#
# That's what I found several years ago with a much older compiler.
# The original SSE helped a lot but SSE2 and later made little difference.
#
# direwolf 1.6 - 64 bit target - gcc 7.4.0
#
# 34.8 sec. with no SIMD instructions enabled.
# 34.8 sec. with SSE
# 34.8 sec. with SSE2
# 34.2 sec. with SSE2, SSE3
# 33.5 sec. with SSE2, SSE3, SSE4.1, SSE4.2
# 33.4 Fedora standard: -mtune=generic
#
# Why do we see such little variation? 64-bit target implies
# SSE, SSE2, SSE3 instructions are available.
#
# Building for a 64 bit target makes it run about 1.5x faster on the same hardware.
#
# The default will be set for maximum portability so packagers won't need to
# to anything special.
#
#
# While ENABLE_GENERIC also had the desired result (for x86_64), I don't think
# it is the right approach. It prevents the detection of the architecture,
# i.e. x86, x86_64, ARM, ARM64. That's why it did not go looking for the various
# SSE instructions. For x86, we would miss out on using SSE.
if (NOT ENABLE_GENERIC)
if (C_MSVC)
detect_architecture("_M_AMD64" x86_64)
detect_architecture("_M_IX86" x86)
detect_architecture("_M_ARM" ARM)
detect_architecture("_M_ARM64" ARM64)
else()
detect_architecture("__x86_64__" x86_64)
detect_architecture("__i386__" x86)
detect_architecture("__arm__" ARM)
detect_architecture("__aarch64__" ARM64)
endif()
endif()
if (NOT DEFINED ARCHITECTURE)
set(ARCHITECTURE "GENERIC")
set(ARCHITECTURE_GENERIC 1)
add_definitions(-DARCHITECTURE_GENERIC=1)
endif()
message(STATUS "Target architecture: ${ARCHITECTURE}")
set(TEST_DIR ${PROJECT_SOURCE_DIR}/cmake/cpu_tests)
# flag that set the minimum cpu flag requirements
# used to create re-distribuitable binary
if (${ARCHITECTURE} MATCHES "x86_64|x86" AND (FORCE_SSE OR FORCE_SSSE3 OR FORCE_SSE41))
if (FORCE_SSE)
set(HAS_SSE ON CACHE BOOL "SSE SIMD enabled")
if(C_GCC OR C_CLANG)
if (${ARCHITECTURE} MATCHES "x86_64")
# All 64-bit capable chips support MMX, SSE, SSE2, and SSE3
# so they are all enabled automatically. We don't want to use
# SSE4, based on build machine capabilites, because the application
# would not run properly on an older CPU.
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mtune=generic" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mtune=generic" )
else()
# Fedora standard uses -msse2 here.
# I dropped it down to -msse for greater compatibility and little penalty.
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32 -march=i686 -mtune=generic -msse -mfpmath=sse" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -march=i686 -mtune=generic -msse -mfpmath=sse" )
endif()
message(STATUS "Use SSE SIMD instructions")
add_definitions(-DUSE_SSE)
elseif(C_MSVC)
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:SSE" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:SSE" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
message(STATUS "Use MSVC SSSE3 SIMD instructions")
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSSE3)
endif()
elseif (FORCE_SSSE3)
set(HAS_SSSE3 ON CACHE BOOL "SSSE3 SIMD enabled")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mssse3" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mssse3" )
message(STATUS "Use SSSE3 SIMD instructions")
add_definitions(-DUSE_SSSE3)
elseif(C_MSVC)
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:SSSE3" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:SSSE3" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
message(STATUS "Use MSVC SSSE3 SIMD instructions")
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSSE3)
endif()
elseif (FORCE_SSE41)
set(HAS_SSSE3 ON CACHE BOOL "SSSE3 SIMD enabled")
set(HAS_SSE4_1 ON CACHE BOOL "Architecture has SSE 4.1 SIMD enabled")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.1" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.1" )
message(STATUS "Use SSE 4.1 SIMD instructions")
add_definitions(-DUSE_SSSE3)
add_definitions(-DUSE_SSE4_1)
elseif(C_MSVC)
# seems that from MSVC 2015 comiler doesn't support those flags
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:SSE4_1" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:SSE4_1" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
message(STATUS "Use SSE 4.1 SIMD instructions")
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSSE3)
add_definitions(-DUSE_SSE4_1)
endif()
endif()
else ()
if (${ARCHITECTURE} MATCHES "x86_64|x86")
if(C_MSVC)
try_run(RUN_SSE2 COMPILE_SSE2 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_sse2.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_SSE2 COMPILE_SSE2 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_sse2.cxx" COMPILE_DEFINITIONS -msse2 -O0)
endif()
if(COMPILE_SSE2 AND RUN_SSE2 EQUAL 0)
set(HAS_SSE2 ON CACHE BOOL "Architecture has SSSE2 SIMD enabled")
message(STATUS "Use SSE2 SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse2" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse2" )
add_definitions(-DUSE_SSE2)
elseif(C_MSVC)
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:SSE2" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:SSE2" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:SSE2" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:SSE2" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSE2)
endif()
else()
set(HAS_SSE2 OFF CACHE BOOL "Architecture does not have SSSE2 SIMD enabled")
endif()
if(C_MSVC)
try_run(RUN_SSSE3 COMPILE_SSSE3 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_ssse3.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_SSSE3 COMPILE_SSSE3 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_ssse3.cxx" COMPILE_DEFINITIONS -mssse3 -O0)
endif()
if(COMPILE_SSSE3 AND RUN_SSSE3 EQUAL 0)
set(HAS_SSSE3 ON CACHE BOOL "Architecture has SSSE3 SIMD enabled")
message(STATUS "Use SSSE3 SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mssse3" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mssse3" )
add_definitions(-DUSE_SSSE3)
elseif(C_MSVC)
# seems not present on MSVC 2017
#set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:SSSE3" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSSE3)
endif()
else()
set(HAS_SSSE3 OFF CACHE BOOL "Architecture does not have SSSE3 SIMD enabled")
endif()
if(C_MSVC)
try_run(RUN_SSE4_1 COMPILE_SSE4_1 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_sse41.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_SSE4_1 COMPILE_SSE4_1 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_sse41.cxx" COMPILE_DEFINITIONS -msse4.1 -O0)
endif()
if(COMPILE_SSE4_1 AND RUN_SSE4_1 EQUAL 0)
set(HAS_SSE4_1 ON CACHE BOOL "Architecture has SSE 4.1 SIMD enabled")
message(STATUS "Use SSE 4.1 SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.1" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.1" )
add_definitions(-DUSE_SSE4_1)
elseif(C_MSVC)
# seems not present on MSVC 2017
#set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:SSE4_1" )
#set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:SSE4_1" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSE4_1)
endif()
else()
set(HAS_SSE4_1 OFF CACHE BOOL "Architecture does not have SSE 4.1 SIMD enabled")
endif()
if(C_MSVC)
try_run(RUN_SSE4_2 COMPILE_SSE4_2 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_sse42.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_SSE4_2 COMPILE_SSE4_2 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_sse42.cxx" COMPILE_DEFINITIONS -msse4.2 -O0)
endif()
if(COMPILE_SSE4_2 AND RUN_SSE4_2 EQUAL 0)
set(HAS_SSE4_2 ON CACHE BOOL "Architecture has SSE 4.2 SIMD enabled")
message(STATUS "Use SSE 4.2 SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.2" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.2" )
add_definitions(-DUSE_SSE4_2)
elseif(C_MSVC)
# seems not present on MSVC 2017
#set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:SSE4_2" )
#set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:SSE4_2" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_SSE4_2)
endif()
else()
set(HAS_SSE4_2 OFF CACHE BOOL "Architecture does not have SSE 4.2 SIMD enabled")
endif()
if(C_MSVC)
try_run(RUN_AVX COMPILE_AVX "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_avx.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_AVX COMPILE_AVX "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_avx.cxx" COMPILE_DEFINITIONS -mavx -O0)
endif()
if(COMPILE_AVX AND RUN_AVX EQUAL 0)
set(HAS_AVX ON CACHE BOOL "Architecture has AVX SIMD enabled")
message(STATUS "Use AVX SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx" )
add_definitions(-DUSE_AVX)
elseif(C_MSVC)
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:AVX" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:AVX" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:AVX" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:AVX" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_AVX)
endif()
else()
set(HAS_AVX OFF CACHE BOOL "Architecture does not have AVX SIMD enabled")
endif()
if(C_MSVC)
try_run(RUN_AVX2 COMPILE_AVX2 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_avx2.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_AVX2 COMPILE_AVX2 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_avx2.cxx" COMPILE_DEFINITIONS -mavx2 -O0)
endif()
if(COMPILE_AVX2 AND RUN_AVX2 EQUAL 0)
set(HAS_AVX2 ON CACHE BOOL "Architecture has AVX2 SIMD enabled")
message(STATUS "Use AVX2 SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx2" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx2" )
add_definitions(-DUSE_AVX2)
elseif(C_MSVC)
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:AVX2" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:AVX2" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:AVX2" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:AVX2" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_AVX2)
endif()
else()
set(HAS_AVX2 OFF CACHE BOOL "Architecture does not have AVX2 SIMD enabled")
endif()
if(C_MSVC)
try_run(RUN_AVX512 COMPILE_AVX512 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_avx512.cxx" COMPILE_DEFINITIONS /O0)
else()
try_run(RUN_AVX512 COMPILE_AVX512 "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_x86_avx512.cxx" COMPILE_DEFINITIONS -mavx512f -O0)
endif()
if(COMPILE_AVX512 AND RUN_AVX512 EQUAL 0)
set(HAS_AVX512 ON CACHE BOOL "Architecture has AVX512 SIMD enabled")
message(STATUS "Use AVX512 SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx512f" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx512f" )
add_definitions(-DUSE_AVX512)
elseif(C_MSVC)
set( CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /arch:AVX512" )
set( CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /arch:AVX512" )
set( CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:AVX512" )
set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Oi /GL /Ot /Ox /arch:AVX512" )
set( CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG" )
add_definitions (/D "_CRT_SECURE_NO_WARNINGS")
add_definitions(-DUSE_AVX512)
endif()
else()
set(HAS_AVX512 OFF CACHE BOOL "Architecture does not have AVX512 SIMD enabled")
endif()
elseif(ARCHITECTURE_ARM)
if(C_MSVC)
try_run(RUN_NEON COMPILE_NEON "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_arm_neon.cxx" COMPILE_DEFINITIONS /O0)
else()
if(${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL ${CMAKE_SYSTEM_PROCESSOR})
try_run(RUN_NEON COMPILE_NEON "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_arm_neon.cxx" COMPILE_DEFINITIONS -mfpu=neon -O0)
else()
try_compile(COMPILE_NEON "${CMAKE_BINARY_DIR}/tmp" "${TEST_DIR}/test_arm_neon.cxx" COMPILE_DEFINITIONS -mfpu=neon -O0)
set(RUN_NEON 0)
endif()
endif()
if(COMPILE_NEON AND RUN_NEON EQUAL 0)
set(HAS_NEON ON CACHE BOOL "Architecture has NEON SIMD enabled")
message(STATUS "Use NEON SIMD instructions")
if(C_GCC OR C_CLANG)
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=neon" )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=neon" )
add_definitions(-DUSE_NEON)
endif()
else()
set(HAS_NEON OFF CACHE BOOL "Architecture does not have NEON SIMD enabled")
endif()
elseif(ARCHITECTURE_ARM64)
# Advanced SIMD (aka NEON) is mandatory for AArch64
set(HAS_NEON ON CACHE BOOL "Architecture has NEON SIMD enabled")
message(STATUS "Use NEON SIMD instructions")
add_definitions(-DUSE_NEON)
endif()
endif()
# clear binary test folder
FILE(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/tmp)