[Bug tree-optimization/91896] [10 Regression] ICE in vect_get_vec_def_for_stmt_copy, at tree-vect-stmts.c:1687

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91896

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Sep 25 13:09:25 2019
New Revision: 276123

URL: https://gcc.gnu.org/viewcvs?rev=276123&root=gcc&view=rev
Log:
2019-09-25  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/91896
        * tree-vect-loop.c (vectorizable_reduction): The single
        def-use cycle optimization cannot apply when there's more
        than one pattern stmt involved.

        * gcc.dg/torture/pr91896.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr91896.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c