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Avoid GCC native architecture for AVX512 CPUs when AVX512 is disabled

This commit is contained in:
Xavier Arteaga 2020-11-18 11:02:14 +01:00 committed by Andre Puschmann
parent 6297a22697
commit ef799a9b42
2 changed files with 16 additions and 2 deletions
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4
CMakeLists.txt
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@ -406,8 +406,8 @@ if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
endif (HAVE_FMA)
if (HAVE_AVX512)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${GCC_ARCH} -mavx512f -mavx512cd -mavx512bw -mavx512dq -DLV_HAVE_AVX512")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=${GCC_ARCH} -mavx512f -mavx512cd -mavx512bw -mavx512dq -DLV_HAVE_AVX512")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx512f -mavx512cd -mavx512bw -mavx512dq -DLV_HAVE_AVX512")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx512f -mavx512cd -mavx512bw -mavx512dq -DLV_HAVE_AVX512")
endif(HAVE_AVX512)
if(NOT ${CMAKE_BUILD_TYPE} STREQUAL "Debug")

14
cmake/modules/FindSSE.cmake
View File

@ -168,6 +168,20 @@ if (ENABLE_SSE)
if (HAVE_AVX512)
message(STATUS "AVX512 is enabled - target CPU must support it")
endif()
elseif (${GCC_ARCH} MATCHES "native" AND CMAKE_CXX_COMPILER_ID MATCHES "GNU")
# When GCC flag -march=native and the CPU supports AVX512 (skylake-avx512 architecture), GCC uses AVX512 instructions
# automatically, independently of the rest of flags.
# Get the CPU architecture
execute_process(COMMAND ${CMAKE_C_COMPILER} -march=native -Q --help=target
OUTPUT_VARIABLE DETECT_SKYLAKE_AVX512)
# Check if the native architecture matches with skylake-avx512
if (${DETECT_SKYLAKE_AVX512} MATCHES "march=.*skylake-avx512")
# Force skylake architecture without AVX512
set(GCC_ARCH "skylake")
message(STATUS "This is a skylake-avx512 CPU, as AVX512 was disabled the architecture will be set to skylake")
endif (${IS_SKYLAKE_AVX512})
endif()