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Subject: [Bug tree-optimization/98117] [8/9/10 Regression] wrong code with
 "-O3 -fno-tree-scev-cprop" since r8-1163-g7078979b291419f3
Date: Mon, 11 Jan 2021 14:10:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98117

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:69894ce172412996c10c89838717980ede7c9003

commit r10-9247-g69894ce172412996c10c89838717980ede7c9003
Author: Richard Biener <rguenther@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 =3D=3D 1 where if we don't know whether we hit the
    above case we cannot emit a range.

    2020-12-07  Richard Biener  <rguenther@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 cdcbef3c3310a14f2994982b44cb1f8e14c77232)=