[Bug target/63679] [5.0 Regression][AArch64] Failure to constant fold.

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63679

--- Comment #23 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Nov 24 14:07:18 2014
New Revision: 218019

URL: https://gcc.gnu.org/viewcvs?rev=218019&root=gcc&view=rev
Log:
2014-11-24  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/63679
    * tree-ssa-sccvn.c: Include ipa-ref.h, plugin-api.h and cgraph.h.
    (copy_reference_ops_from_ref): Fix non-constant ADDR_EXPR case
    to properly leave off at -1.
    (fully_constant_vn_reference_p): Generalize folding from
    constant initializers.
    (vn_reference_lookup_3): When looking through aggregate copies
    handle offsetted reads and try simplifying the result to
    a constant.
    * gimple-fold.h (fold_ctor_reference): Export.
    * gimple-fold.c (fold_ctor_reference): Likewise.

    * gcc.dg/tree-ssa/ssa-fre-42.c: New testcase.
    * gcc.dg/tree-ssa/20030807-5.c: Avoid folding read from global to zero.
    * gcc.target/i386/ssetype-1.c: Likewise.
    * gcc.target/i386/ssetype-3.c: Likewise.
    * gcc.target/i386/ssetype-5.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-42.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-fold.c
    trunk/gcc/gimple-fold.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/20030807-5.c
    trunk/gcc/testsuite/gcc.target/i386/ssetype-1.c
    trunk/gcc/testsuite/gcc.target/i386/ssetype-3.c
    trunk/gcc/testsuite/gcc.target/i386/ssetype-5.c
    trunk/gcc/tree-ssa-sccvn.c