https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110740
Kewen Lin <linkw at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org,
| |rsandifo at gcc dot gnu.org
--- Comment #2 from Kewen Lin <linkw at gcc dot gnu.org> ---
Previously function vect_update_epilogue_niters has some code special-casing
the single scalar iteration epilogue:
-static bool
-vect_update_epilogue_niters (loop_vec_info epilogue_vinfo,
- unsigned HOST_WIDE_INT const_niters)
-{
- /* Avoid wrap-around when computing const_niters - 1. Also reject
- using an epilogue loop for a single scalar iteration, even if
- we could in principle implement that using partial vectors. */
- unsigned int gap_niters = LOOP_VINFO_PEELING_FOR_GAPS (epilogue_vinfo);
- if (const_niters <= gap_niters + 1)
- return false;
It's enabled without any costing consideration before, it sounds quite
reasonable so I think we still want it?
