Makefile.in (OBJC-common): Add tree-ssa-threadupdate.c

        * Makefile.in (OBJC-common): Add tree-ssa-threadupdate.c
        (tree-ssa-threadupdate.o): Add dependencies.
        * tree-ssa-threadupdate.c: New file.
        * tree-flow.h (incoming_edge_threaded): New flag in block annotation.
        (rewrite_vars_out_of_ssa): Remove prototype.
        (cleanup_tree_cfg): Returns a bool.
        * tree.h (thread_through_all_blocks): Prototype.
        * tree-outof-ssa.c  (SSANORM_*): Move into here.
        (remove_ssa_form): Now static.
        (rewrite_vars_out_of_ssa): Kill.
        * tree-ssa-live.c (register_ssa_partitions_for_vars): Kill.
        * tree-ssa-live.h (SSANORM_*): Moved into tree-outof-ssa.c.
        (remove_ssa_form, register_partitions_for_vars): Kill declarations.
        * tree-cfg.c (cleanup_tree_cfg): Return a value indicating if
        anything was changed.
        * tree-phinodes.c (add_phi_arg): Get the block for the PHI
        from the PHI's annotation rather than the edge associated with
        the new argument.
        * tree-ssa-dom.c (redirection_edges): Kill.
        (redirect_edges_and_update_ssa_graph): Kill.
        (tree_ssa_dominator_optimize): Do not reset forwardable flag
        for blocks anymore.  Do not initialize redirection_edges.
        Call thread_through_all_blocks.  Simplify code for cleanup
        of the CFG and iterating.  No longer call cleanup_tree_cfg
        outside the iteration loop.
        (thread_across_edge): No longer mess with forwardable blocks.

From-SVN: r85721

1 files changed, 4 insertions, 1 deletions

diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 86ac7ee..c9bc37c 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -717,10 +717,11 @@ make_goto_expr_edges (basic_block bb)
 
 /* Remove unreachable blocks and other miscellaneous clean up work.  */
 
-void
+bool
 cleanup_tree_cfg (void)
 {
   bool something_changed = true;
+  bool retval = false;
 
   timevar_push (TV_TREE_CLEANUP_CFG);
 
@@ -731,6 +732,7 @@ cleanup_tree_cfg (void)
       something_changed = cleanup_control_flow ();
       something_changed |= delete_unreachable_blocks ();
       something_changed |= thread_jumps ();
+      retval |= something_changed;
     }
 
   /* Merging the blocks creates no new opportunities for the other
@@ -743,6 +745,7 @@ cleanup_tree_cfg (void)
   verify_flow_info ();
 #endif
   timevar_pop (TV_TREE_CLEANUP_CFG);
+  return retval;
 }