[Bug bootstrap/77768] [7 Regression] LTO/PGO -O3 bootstrap broken: tree-vrp.c:11053:0: internal compiler error: Segmentation fault

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77768

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Nov  3 13:25:51 2016
New Revision: 241818

URL: https://gcc.gnu.org/viewcvs?rev=241818&root=gcc&view=rev
Log:
2016-11-03  Richard Biener  <rguenther@suse.de>

        Backport from mainline
        2016-09-29  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/77768
        * tree-ssa-sccvn.c (visit_reference_op_store): Properly deal
        with stores to a place we know has a constant value.
        * tree-vrp.c (set_defs_to_varying): New helper avoiding
        writing to vr_const_varying.
        (vrp_initialize): Call it.
        (vrp_visit_stmt): Likewise.
        (evrp_dom_walker::before_dom_children): Likewise.
        * tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
        Handle stores to readonly memory when removing redundant stores.

        * gcc.dg/torture/pr77768.c: New testcase.

Added:
    branches/gcc-6-branch/gcc/testsuite/gcc.dg/torture/pr77768.c
Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/testsuite/ChangeLog
    branches/gcc-6-branch/gcc/tree-ssa-pre.c
    branches/gcc-6-branch/gcc/tree-ssa-sccvn.c
    branches/gcc-6-branch/gcc/tree-vrp.c