[Bug tree-optimization/51879] Missed tail merging with non-const/pure calls

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51879

--- Comment #9 from vries at gcc dot gnu.org 2012-04-27 06:12:55 UTC ---
Author: vries
Date: Fri Apr 27 06:12:49 2012
New Revision: 186894

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186894
Log:
2012-04-27  Tom de Vries  <t...@codesourcery.com>

    PR tree-optimization/51879
    * tree-ssa-sccvn.h (struct vn_reference_s): Add result_vdef field.
    * tree-ssa-sccvn.c (mark_use_processed): New function, factored out
    of ...
    (defs_to_varying): ... here.  Don't set use_processed.
    (visit_reference_op_call): Handle gimple_vdef.
    Handle case that lhs is NULL_TREE.
    (visit_use): Use mark_use_processed.  Handle calls with side-effect
    using visit_reference_op_call.

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