[Bug tree-optimization/70701] incomplete value numbering when memcpy-ing from array

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70701

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr 18 11:39:04 2016
New Revision: 235131

URL: https://gcc.gnu.org/viewcvs?rev=235131&root=gcc&view=rev
Log:
2016-04-18  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/70701
        * tree-ssa-sccvn.c (vn_reference_lookup_3): Resolve fully constant
        references after translating through a memcpy.

        * gcc.dg/tree-ssa/ssa-fre-53.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-53.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c