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Better AVX2 detection, try 2 (only using intrinsic functions) (#420)

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* Better AVX2 detection, try 2 (only using intrinsic functions)

* Slight change to AVX2 detection per jedisct1's feedback
This commit is contained in:
Ilya Maykov 2016-08-04 11:58:48 -07:00 committed by Frank Denis
parent 6035c0779b
commit a3b68738db
1 changed files with 7 additions and 1 deletions
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8
configure.ac
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@ -398,7 +398,13 @@ AS_IF([test "x$EMSCRIPTEN" = "x" -a "$host_os" != "pnacl"], [
#endif
#pragma GCC target("avx2")
#include <immintrin.h>
]], [[ __m256i x = _mm256_abs_epi8(_mm256_setzero_si256()); ]])],
]], [[
// the code below is intentionally crafted to make sure the compiler
// can't optimize the AVX2 instructions away.
__m256 x = _mm256_set1_ps(3.14);
__m256 y = _mm256_permutevar8x32_ps(x, _mm256_set1_epi32(42));
return _mm256_movemask_ps(_mm256_cmp_ps(x, y, _CMP_NEQ_OQ));
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_AVX2INTRIN_H], [1], [AVX2 is available])
AX_CHECK_COMPILE_FLAG([-mavx2], [CFLAGS_AVX2="-mavx2"])