https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98117
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:4db478784807708c031a77ae11850529fa5ecff1 commit r9-9288-g4db478784807708c031a77ae11850529fa5ecff1 Author: Richard Biener <rguent...@suse.de> Date: Mon Dec 7 10:29:07 2020 +0100 tree-optimization/98117 - fix range set by vectorization on niter IVs This avoids the degenerate case of a TYPE_MAX_VALUE latch iteration count value causing wrong range info for the vector IV. There's still the case of VF == 1 where if we don't know whether we hit the above case we cannot emit a range. 2020-12-07 Richard Biener <rguent...@suse.de> PR tree-optimization/98117 * tree-vect-loop-manip.c (vect_gen_vector_loop_niters): Properly handle degenerate niter when setting the vector loop IV range. * gcc.dg/torture/pr98117.c: New testcase. (cherry picked from commit 69894ce172412996c10c89838717980ede7c9003)
