http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51499
--- Comment #9 from Ira Rosen <irar at il dot ibm.com> 2011-12-12 11:13:24 UTC --- (In reply to comment #7) > > In some cases it might be necessary but not here: > > sum1+=a; > sum2+=a; > > gives exactly the same result as > > (sum1, sum2) += (a, a); > So, you are suggesting to remove the need in flag_associative_math for fp for cases when a reduction computation is already unrolled by the vectorization factor. Sounds reasonable to me.
