https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118028
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |15.0
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're usually handling this as a double-reduction, aka vectorizing the outer
loop. But
t.c:6:5: note: Analyze phi: sum_20 = PHI <sum_14(8), sum_23(5)>
t.c:6:5: note: reduction path: sum_14 sum_20
t.c:6:5: note: reduction: detected reduction
t.c:6:5: note: Detected vectorizable nested cycle.
and
t.c:6:5: note: grouped access in outer loop.
t.c:6:5: missed: not vectorized: complicated access pattern.
t.c:10:21: missed: not vectorized: complicated access pattern.
t.c:6:5: missed: bad data access.
so there's work to be done to enable outer loop vectorization for this.
