[Bug tree-optimization/79777] [7 Regression] ICE on -Os and above in on aarch64-linux-gnu (internal compiler error: in VN_INFO_GET, at tree-ssa-sccvn.c:407 })

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79777

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar  2 07:53:42 2017
New Revision: 245830

URL: https://gcc.gnu.org/viewcvs?rev=245830&root=gcc&view=rev
Log:
2017-03-02  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/79777
        * tree-ssa-pre.c (eliminate_insert): Give up if we simplify
        the to insert expression to sth existing.

        * gcc.dg/torture/pr79777.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr79777.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c