[Bug tree-optimization/113178] [14 Regression] ice in find_uses_to_rename_use

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113178

--- Comment #8 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tamar Christina <tnfchris@gcc.gnu.org>:

https://gcc.gnu.org/g:e79c5855ab39d96baa7c6bec63eb97715abcf68d

commit r14-7197-ge79c5855ab39d96baa7c6bec63eb97715abcf68d
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Fri Jan 12 15:26:29 2024 +0000

    middle-end: fill in reduction PHI for all alt exits [PR113178]

    When we have a loop with more than 2 exits and a reduction I forgot to fill
in
    the PHI value for all alternate exits.

    All alternate exits use the same PHI value so we should loop over the new
    PHI elements and copy the value across since we call the reduction
calculation
    code only once for all exits.  This was normally covered up by earlier
parts of
    the compiler rejecting loops incorrectly (which has been fixed now).

    Note that while I can use the loop in all cases, the reason I separated out
the
    main and alt exit is so that if you pass the wrong edge the macro will
assert.

    gcc/ChangeLog:

            PR tree-optimization/113178
            * tree-vect-loop.cc (vect_create_epilog_for_reduction): Fill in all
            alternate exits.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/113178
            * gcc.dg/vect/vect-early-break_101-pr113178.c: New test.
            * gcc.dg/vect/vect-early-break_102-pr113178.c: New test.