[Bug tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85615

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu May  3 13:20:02 2018
New Revision: 259891

URL: https://gcc.gnu.org/viewcvs?rev=259891&root=gcc&view=rev
Log:
2018-05-03  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/85615
        * tree-ssa-threadupdate.c (thread_block_1): Only allow exits
        to loops not nested in BBs loop father to avoid creating multi-entry
        loops.

        * gcc.dg/torture/pr85615.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr85615.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-threadupdate.c