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https://github.com/VectorCamp/vectorscan.git
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89bc2b4b39
We require SSSE3, and optionally support AVX2, and the best way of testing the compiler and compile flags is to run the compiler.
43 lines
1.0 KiB
CMake
43 lines
1.0 KiB
CMake
# detect architecture features
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#
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# must be called after determining where compiler intrinsics are defined
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if (HAVE_C_X86INTRIN_H)
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set (INTRIN_INC_H "x86intrin.h")
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elseif (HAVE_C_INTRIN_H)
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set (INTRIN_INC_H "intrin.h")
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else ()
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message (FATAL_ERROR "No intrinsics header found")
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endif ()
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set (CMAKE_REQUIRED_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_C_FLAGS}")
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# ensure we have the minimum of SSSE3 - call a SSSE3 intrinsic
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CHECK_C_SOURCE_COMPILES("#include <${INTRIN_INC_H}>
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int main() {
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__m128i a = _mm_set1_epi8(1);
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(void)_mm_shuffle_epi8(a, a);
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}" HAVE_SSSE3)
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if (NOT HAVE_SSSE3)
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message(FATAL_ERROR "A minimum of SSSE3 compiler support is required")
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endif ()
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# now look for AVX2
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CHECK_C_SOURCE_COMPILES("#include <${INTRIN_INC_H}>
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#if !defined(__AVX2__)
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#error no avx2
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#endif
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int main(){
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__m256i z = _mm256_setzero_si256();
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(void)_mm256_xor_si256(z, z);
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}" HAVE_AVX2)
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if (NOT HAVE_AVX2)
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message(STATUS "Building without AVX2 support")
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endif ()
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unset (CMAKE_REQUIRED_FLAGS)
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unset (INTRIN_INC_H)
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