[Bug tree-optimization/78856] [6 Regression] wrong code at -O3 on x86_64-linux-gnu (in both 32-bit and 64-bit modes)

["law at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78856

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[6/7 Regression] wrong code |[6 Regression] wrong code
                   |at -O3 on x86_64-linux-gnu  |at -O3 on x86_64-linux-gnu
                   |(in both 32-bit and 64-bit  |(in both 32-bit and 64-bit
                   |modes)                      |modes)

--- Comment #6 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan  4 05:31:23 2017
New Revision: 244045

URL: https://gcc.gnu.org/viewcvs?rev=244045&root=gcc&view=rev
Log:
        PR tree-optimizatin/78856
        * tree-ssa-threadupdate.c: Include tree-vectorizer.h.
        (mark_threaded_blocks): Remove code to truncate thread paths that
        cross multiple loop headers.  Instead invalidate the cached loop
        iteration information and handle case of a thread path walking
        into an irreducible region.

        PR tree-optimization/78856
        * gcc.c-torture/execute/pr78856.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr78856.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-threadupdate.c

--- Comment #7 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on trunk so far.