[Bug tree-optimization/87211] [9 Regression] gcc ICE at O2: in set_ssa_val_to, at tree-ssa-sccvn.c:3628

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87211

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Sep  4 12:04:42 2018
New Revision: 264079

URL: https://gcc.gnu.org/viewcvs?rev=264079&root=gcc&view=rev
Log:
2018-09-04  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/87211
        * tree-ssa-sccvn.c (visit_phi): When value-numbering to a
        backedge value we're supposed to treat as VARYING also number
        the PHI to VARYING in case it got a different value-number already.

        * gcc.dg/torture/pr87211.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr87211.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c