[Bug tree-optimization/91573] Vectorization failure for a loop to do multiply-add

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91573

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
t5.c:10:5: missed:  cost model: the vector iteration cost = 12372 divided by
the scalar iteration cost = 236 is greater or equal to the vectorization factor
= 16.
t5.c:10:5: missed:  not vectorized: vectorization not profitable.
t5.c:10:5: missed:  not vectorized: vector version will never be profitable.
t5.c:10:5: missed:  Loop costings may not be worthwhile.
t5.c:10:5: missed: couldn't vectorize loop
t5.c:6:6: note: vectorized 0 loops in function.