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configure.ac: cast utest to __m128i_u* in avx2 check for _mm_loadu_si128 #362

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configure.ac: cast utest to __m128i_u* in avx2 check for _mm_loadu_si128 #362

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5 changes: 3 additions & 2 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -697,9 +697,10 @@ AS_IF([test x"$enable_intrinsics" = x"yes"],[
__m256i mtest2;
mtest = _mm256_set1_ps((float)time(NULL));
mtest = _mm256_fmadd_ps(mtest, mtest, mtest);
mtest1 = _mm256_set_m128i(_mm_loadu_si64(utest), _mm_loadu_si64(utest));
mtest1 = _mm256_set_m128i(
_mm_loadl_epi64((__m128i_u *)utest), _mm_loadl_epi64((__m128i_u *)utest));
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As far as I can tell, __m128i_u is just an internal gcc/clang thing and not something we can rely on unfortunately.

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Solution?

mtest2 =
_mm256_cvtepi16_epi32(_mm_loadu_si128(utest));
_mm256_cvtepi16_epi32(_mm_loadu_si128((__m128i_u *)utest));
return _mm256_extract_epi16(_mm256_xor_si256(
_mm256_xor_si256(mtest1, mtest2), _mm256_cvttps_epi32(mtest)), 0);
]]
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