[Bug tree-optimization/52009] Another missed tail merging opportunity

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52009

--- Comment #5 from vries at gcc dot gnu.org 2012-07-06 11:07:36 UTC ---
Author: vries
Date: Fri Jul  6 11:07:32 2012
New Revision: 189321

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189321
Log:
2012-07-06  Tom de Vries  <t...@codesourcery.com>

    PR tree-optimization/52009
    * tree-ssa-tail-merge.c (gimple_equal_p): For GIMPLE_ASSIGN, compare
    value numbers of gimple_vdef.
    * tree-ssa-sccvn.h (vn_reference_insert): Add vdef parameter to
    prototype.
    * tree-ssa-sccvn.c (copy_reference_ops_from_ref): Handle MODIFY_EXPR.
    (vn_reference_insert): Add and handle vdef parameter.
    (visit_reference_op_load): Add argument to vn_reference_insert call.
    (visit_reference_op_store): Find value number of vdef of store.  Insert
    value number of vdef of store.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c
    trunk/gcc/tree-ssa-sccvn.h
    trunk/gcc/tree-ssa-tail-merge.c