obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 79 insertions, 0 deletions

diff --git a/gcc/tree-ssa-propagate.h b/gcc/tree-ssa-propagate.h
new file mode 100644
index 000000000..778f650d0
--- /dev/null
+++ b/gcc/tree-ssa-propagate.h
@@ -0,0 +1,79 @@
+/* Data structures and function declarations for the SSA value propagation
+   engine.
+   Copyright (C) 2004, 2005, 2007, 2008, 2010 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@redhat.com>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef _TREE_SSA_PROPAGATE_H
+#define _TREE_SSA_PROPAGATE_H 1
+
+/* If SIM_P is true, statement S will be simulated again.  */
+
+static inline void
+prop_set_simulate_again (gimple s, bool visit_p)
+{
+  gimple_set_visited (s, visit_p);
+}
+
+/* Return true if statement T should be simulated again.  */
+
+static inline bool
+prop_simulate_again_p (gimple s)
+{
+  return gimple_visited_p (s);
+}
+
+/* Lattice values used for propagation purposes.  Specific instances
+   of a propagation engine must return these values from the statement
+   and PHI visit functions to direct the engine.  */
+enum ssa_prop_result {
+    /* The statement produces nothing of interest.  No edges will be
+       added to the work lists.  */
+    SSA_PROP_NOT_INTERESTING,
+
+    /* The statement produces an interesting value.  The set SSA_NAMEs
+       returned by SSA_PROP_VISIT_STMT should be added to
+       INTERESTING_SSA_EDGES.  If the statement being visited is a
+       conditional jump, SSA_PROP_VISIT_STMT should indicate which edge
+       out of the basic block should be marked executable.  */
+    SSA_PROP_INTERESTING,
+
+    /* The statement produces a varying (i.e., useless) value and
+       should not be simulated again.  If the statement being visited
+       is a conditional jump, all the edges coming out of the block
+       will be considered executable.  */
+    SSA_PROP_VARYING
+};
+
+
+/* Call-back functions used by the value propagation engine.  */
+typedef enum ssa_prop_result (*ssa_prop_visit_stmt_fn) (gimple, edge *, tree *);
+typedef enum ssa_prop_result (*ssa_prop_visit_phi_fn) (gimple);
+typedef bool (*ssa_prop_fold_stmt_fn) (gimple_stmt_iterator *gsi);
+typedef tree (*ssa_prop_get_value_fn) (tree);
+
+
+/* In tree-ssa-propagate.c  */
+void ssa_propagate (ssa_prop_visit_stmt_fn, ssa_prop_visit_phi_fn);
+bool valid_gimple_rhs_p (tree);
+void move_ssa_defining_stmt_for_defs (gimple, gimple);
+bool update_call_from_tree (gimple_stmt_iterator *, tree);
+bool stmt_makes_single_store (gimple);
+bool substitute_and_fold (ssa_prop_get_value_fn, ssa_prop_fold_stmt_fn, bool);
+
+#endif /* _TREE_SSA_PROPAGATE_H  */