https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80124 --- Comment #1 from Guille <guille at berkeley dot edu> --- I forgot to mention that a while back (~1year) I had a similar problem with _mm256_cmp_ps(a,b, _CMP_EQ_OQ) (the AVX equivalent of _mm_cmpeq_ps), but I wasn't able to isolate the problem back then.