[Bug tree-optimization/66894] [6 Regression] wrong code at -Os and above on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66894

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jul 16 11:27:34 2015
New Revision: 225870

URL: https://gcc.gnu.org/viewcvs?rev=225870&root=gcc&view=rev
Log:
2015-07-16  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/66894
        * tree-vrp.c (register_edge_assert_for_2): Fix bad assumption
        about deriving NE_EXPR from truncated values.

        * gcc.dg/torture/pr66894.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr66894.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c