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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0.
include(CheckCCompilerFlag)
include(CheckIncludeFile)
if (USE_CPU_EXTENSIONS)
if (MSVC)
check_c_compiler_flag("/arch:AVX2" HAVE_M_AVX2_FLAG)
if (HAVE_M_AVX2_FLAG)
set(AVX2_CFLAGS "/arch:AVX2")
endif()
else()
check_c_compiler_flag(-mavx2 HAVE_M_AVX2_FLAG)
if (HAVE_M_AVX2_FLAG)
set(AVX2_CFLAGS "-mavx -mavx2")
endif()
endif()
set(old_flags "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${AVX2_CFLAGS}")
check_c_source_compiles("
#include <immintrin.h>
#include <emmintrin.h>
#include <string.h>
int main() {
__m256i vec;
memset(&vec, 0, sizeof(vec));
_mm256_shuffle_epi8(vec, vec);
_mm256_set_epi32(1,2,3,4,5,6,7,8);
_mm256_permutevar8x32_epi32(vec, vec);
return 0;
}" HAVE_AVX2_INTRINSICS)
check_c_source_compiles("
#include <immintrin.h>
#include <string.h>
int main() {
__m256i vec;
memset(&vec, 0, sizeof(vec));
return (int)_mm256_extract_epi64(vec, 2);
}" HAVE_MM256_EXTRACT_EPI64)
set(CMAKE_REQUIRED_FLAGS "${old_flags}")
endif() # USE_CPU_EXTENSIONS
macro(simd_add_definition_if target definition)
if(${definition})
target_compile_definitions(${target} PRIVATE -D${definition})
endif(${definition})
endmacro(simd_add_definition_if)
# Configure private preprocessor definitions for SIMD-related features
# Does not set any processor feature codegen flags
function(simd_add_definitions target)
simd_add_definition_if(${target} HAVE_AVX2_INTRINSICS)
simd_add_definition_if(${target} HAVE_MM256_EXTRACT_EPI64)
endfunction(simd_add_definitions)
# Adds source files only if AVX2 is supported. These files will be built with
# avx2 intrinsics enabled.
# Usage: simd_add_source_avx2(target file1.c file2.c ...)
function(simd_add_source_avx2 target)
foreach(file ${ARGN})
target_sources(${target} PRIVATE ${file})
set_source_files_properties(${file} PROPERTIES COMPILE_FLAGS "${AVX2_CFLAGS}")
endforeach()
endfunction(simd_add_source_avx2)
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