[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378

[wschmidt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010

--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
r189527 is probably a red herring.  That just changed the cost model to be
turned on by default at -O3.  Somebody who's actively working on the vectorizer
should probably have a look at this.

If you want to narrow it down further, try turning on -fvect-cost-model and
bisecting.  The problem will probably show up as being introduced further back
if you do this.

This also suggests a workaround for the OP of using -fno-vect-cost-model, if a
workaround is needed.