[Bug tree-optimization/71403] [7 Regression] wrong code (segfault) at -O3 on x86_64-linux-gnu

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71403

--- Comment #12 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Mon Oct  3 19:28:24 2016
New Revision: 240727

URL: https://gcc.gnu.org/viewcvs?rev=240727&root=gcc&view=rev
Log:
        PR tree-optimization/71550
        PR tree-optimization/71403
        * tree-ssa-threadbackward.c: Include tree-vectorizer.h
        (profitable_jump_thread_path): Also return boolean indicating if
        the realized path will create an irreducible loop.
        Remove loop depth tests from 71403.
        (fsm_find_control_statement_thread_paths): Remove loop depth tests
        from 71403.  If threading will create an irreducible loop, then
        throw away loop iteration and related information.

        PR tree-optimization/71550
        PR tree-optimization/71403
        * gcc.c-torture/execute/pr71550.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr71550.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-threadbackward.c