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Subject: [Bug tree-optimization/96698] [10 Regression] ICE during GIMPLE
 pass:vect
Date: Wed, 02 Dec 2020 11:41:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96698

--- Comment #4 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:66dd83c8840a9a28f6209922b8abd5783a255207

commit r10-9106-g66dd83c8840a9a28f6209922b8abd5783a255207
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Aug 26 15:12:17 2020 +0200

    tree-optimization/96698 - fix ICE when vectorizing nested cycles

    This fixes vectorized PHI latch edge updating and delay it until
    all of the loop is code generated to deal with the case that the
    latch def is a PHI in the same block.

    2020-08-26  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/96698
            * tree-vectorizer.h (loop_vec_info::reduc_latch_defs): New.
            (loop_vec_info::reduc_latch_slp_defs): Likewise.
            * tree-vect-stmts.c (vect_transform_stmt): Only record
            stmts to update PHI latches from, perform the update ...
            * tree-vect-loop.c (vect_transform_loop): ... here after
            vectorizing those PHIs.
            (info_for_reduction): Properly handle non-reduction PHIs.

            * gcc.dg/vect/pr96698.c: New testcase.

    (cherry picked from commit 2130efe6ac7beba72d289e3dd145daa10aeaed54)=