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Add a new option for requiring BMI2 intrinsics #171

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Add a new option for requiring BMI2 intrinsics #171

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16 changes: 11 additions & 5 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,8 @@ option(SNAPPY_REQUIRE_AVX "Target processors with AVX support." OFF)

option(SNAPPY_REQUIRE_AVX2 "Target processors with AVX2 support." OFF)

option(SNAPPY_REQUIRE_BMI2 "Target processors with BMI2 support." ON)

option(SNAPPY_INSTALL "Install Snappy's header and library" ON)

include(TestBigEndian)
Expand Down Expand Up @@ -185,11 +187,15 @@ int main() {
return __crc32cw(0, 1);
}" SNAPPY_HAVE_NEON_CRC32)

check_cxx_source_compiles("
#include <immintrin.h>
int main() {
return _bzhi_u32(0, 1);
}" SNAPPY_HAVE_BMI2)
if(SNAPPY_REQUIRE_BMI2)
check_cxx_source_compiles("
#include <immintrin.h>
int main() {
return _bzhi_u32(0, 1);
}" SNAPPY_HAVE_BMI2)
else()
set(SNAPPY_HAVE_BMI2 FALSE)
endif(SNAPPY_REQUIRE_BMI2)

check_cxx_source_compiles("
#include <arm_neon.h>
Expand Down