http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57328
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
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Keywords| |missed-optimization
--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
(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).
Ah, I was only thinking of quiet nans. -fno-signaling-nans should be enough
though, no? (I checked and it doesn't help, which makes sense since it is the
default) I think it is quite common to care about quiet nans but not use
signaling nans.
