[Bug tree-optimization/96920] [10/11 Regression] ICE segmentation fault in tree-vectorizer at -O3

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96920

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:46a58c779af3055a4b10b285a1f4be28abe4351c

commit r11-3013-g46a58c779af3055a4b10b285a1f4be28abe4351c
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 4 14:35:39 2020 +0200

    tree-optimization/96920 - another ICE when vectorizing nested cycles

    This refines the previous fix for PR96698 by re-doing how and where
    we arrange for setting vectorized cycle PHI backedge values.

    2020-09-04  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/96698
            PR tree-optimization/96920
            * tree-vectorizer.h (loop_vec_info::reduc_latch_defs): Remove.
            (loop_vec_info::reduc_latch_slp_defs): Likewise.
            * tree-vect-stmts.c (vect_transform_stmt): Remove vectorized
            cycle PHI latch code.
            * tree-vect-loop.c (maybe_set_vectorized_backedge_value): New
            helper to set vectorized cycle PHI latch values.
            (vect_transform_loop): Walk over all PHIs again after
            vectorizing them, calling maybe_set_vectorized_backedge_value.
            Call maybe_set_vectorized_backedge_value for each vectorized
            stmt.  Remove delayed update code.
            * tree-vect-slp.c (vect_analyze_slp_instance): Initialize
            SLP instance reduc_phis member.
            (vect_schedule_slp): Set vectorized cycle PHI latch values.

            * gfortran.dg/vect/pr96920.f90: New testcase.
            * gcc.dg/vect/pr96920.c: Likewise.