57 lines
1.7 KiB
CMake
57 lines
1.7 KiB
CMake
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# Copyright 2021 DeepMind Technologies Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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include(CheckCSourceCompiles)
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# Assigns compiler options to the given variable based on availability of AVX.
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function(get_avx_compile_options OUTPUT_VAR)
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message(VERBOSE "Checking if AVX is available...")
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if(MSVC)
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set(CMAKE_REQUIRED_FLAGS "/arch:AVX")
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elseif(WIN32)
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# Abseil LTS 20230125.0 assumes that AVX implies PCLMUL on Windows.
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set(CMAKE_REQUIRED_FLAGS "-mavx" "-mpclmul")
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else()
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set(CMAKE_REQUIRED_FLAGS "-mavx")
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endif()
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if(APPLE AND "x86_64" IN_LIST CMAKE_OSX_ARCHITECTURES)
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message(STATUS "Building x86_64 on macOS, forcing CAN_BUILD_AVX to TRUE.")
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set(CAN_BUILD_AVX TRUE)
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else()
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check_c_source_compiles(
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"
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#include <immintrin.h>
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int main(int argc, char* argv[]) {
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__m256d ymm;
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return 0;
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}
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"
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CAN_BUILD_AVX
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)
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endif()
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if(CAN_BUILD_AVX)
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message(VERBOSE "Checking if AVX is available... AVX available.")
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set("${OUTPUT_VAR}"
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${CMAKE_REQUIRED_FLAGS}
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PARENT_SCOPE
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)
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else()
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message(VERBOSE "Checking if AVX is available... AVX not available.")
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set("${OUTPUT_VAR}" PARENT_SCOPE)
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endif()
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endfunction()
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