[Bug tree-optimization/81192] [8 Regression] gcc ICE at -Os on x86_64-linux-gnu: Segmentation fault

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81192

--- Comment #16 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Mon Jul  3 08:32:20 2017
New Revision: 249898

URL: https://gcc.gnu.org/viewcvs?rev=249898&root=gcc&view=rev
Log:
Backport "Fix sigsegv in find_same_succ_bb"

2017-07-03  Tom de Vries  <tom@codesourcery.com>

        backport from mainline:
        2017-07-03  Tom de Vries  <tom@codesourcery.com>

        PR tree-optimization/81192
        * tree-ssa-tail-merge.c (same_succ_flush_bb): Handle
        BB_SAME_SUCC (bb) == NULL.

        * gcc.dg/pr81192.c: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.dg/pr81192.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/testsuite/ChangeLog
    branches/gcc-7-branch/gcc/tree-ssa-tail-merge.c