https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64286
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2015-01-09 Ever confirmed|0 |1 --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Reduced testcase (-O2 -mavx2): #include <string.h> #include <stdlib.h> #include <x86intrin.h> __m128i v; __m256i w; __attribute__((noinline, noclone)) void foo (__m128i *p, __m128i *q) { __m128i a = _mm_loadu_si128 (p); __m128i b = _mm_xor_si128 (a, v); w = _mm256_cvtepu8_epi16 (a); *q = b; } int main () { v = _mm_set1_epi8 (0x40); __m128i c = _mm_set_epi8 (16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1); __m128i d; foo (&c, &d); __m128i e = _mm_set_epi8 (0x50, 0x4f, 0x4e, 0x4d, 0x4c, 0x4b, 0x4a, 0x49, 0x48, 0x47, 0x46, 0x45, 0x44, 0x43, 0x42, 0x41); __m256i f = _mm256_set_epi16 (16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1); if (memcmp (&w, &f, sizeof (w)) != 0 || memcmp (&d, &e, sizeof (d)) != 0) abort (); return 0; }