[Bug tree-optimization/81403] [8 Regression] wrong code at -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81403

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Nov 23 08:30:41 2017
New Revision: 255092

URL: https://gcc.gnu.org/viewcvs?rev=255092&root=gcc&view=rev
Log:
2017-11-23  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/81403
        * tree-ssa-pre.c (get_representative_for): Add parameter specifying
        a block we need a leader relative to.
        (phi_translate_1): For nary processing require a leader from
        get_representative_for given we run expression simplification
        using match-and-simplify.  Remove previous fix.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-pre.c