http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57328
--- Comment #7 from Brian Taylor <spam.brian.taylor at gmail dot com> --- (In reply to Jakub Jelinek from comment #5) > But vectorization reorders the loop iterations, thus say if some value is > sNaN, you'd get exceptions in different order. So, I'm afraid without > -ffast-math you can vectorize this only if the user says that the order of > iterations doesn't matter (say using OpenMP 4.0 #pragma omp simd or Cilk+ > #pragma simd). I'm not sure this is actually a problem (or perhaps there is a another bug), because as I noted in the PR replacing min or max with a "functionally equivalent" sequence of if statements allows vectorization.
