[Bug tree-optimization/47365] [4.5/4.6 Regression] wrong code with -O -ftree-pre

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47365

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-21 
14:02:45 UTC ---
Author: rguenth
Date: Fri Jan 21 14:02:41 2011
New Revision: 169089

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=169089
Log:
2011-01-21  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/47365
    * tree-ssa-sccvn.h (vn_lookup_kind): Declare.
    (vn_reference_lookup_pieces): Adjust.
    (vn_reference_lookup): Likewise.
    * tree-ssa-sccvn.c (vn_walk_kind): New static global.
    (vn_reference_lookup_3): Only look through kills if in
    VN_WALKREWRITE mode.
    (vn_reference_lookup_pieces): Adjust.
    (vn_reference_lookup): Likewise.
    (visit_reference_op_load): Likewise.
    (visit_reference_op_store): Likewise.
    * tree-ssa-pre.c (phi_translate_1): Use VN_WALK mode.
    (compute_avail): Likewise.
    (eliminate): Likewise.

    * gcc.dg/torture/pr47365.c: New testcase.
    * gcc.dg/tree-ssa/pr47392.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr47365.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr47392.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c
    trunk/gcc/tree-ssa-sccvn.c
    trunk/gcc/tree-ssa-sccvn.h