* Makefile.in (OBJS-common): Add tree-ssa-propagate.o

	(tree-ssa-propagate.o): New rule.
	(GTFILES): Add tree-ssa-propagate.c.
	* tree-flow.h (struct stmt_ann_d): Remove field
	in_ccp_worklist.
	* tree-ssa-propagate.c: New file.
	* tree-ssa-propagate.h: New file.
	* tree-ssa-ccp.c: Re-write to use the routines from
	tree-ssa-propagate.c.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@86711 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 62 insertions, 0 deletions

diff --git a/gcc/tree-ssa-propagate.h b/gcc/tree-ssa-propagate.h
new file mode 100644
index 00000000000..d390176937a
--- /dev/null
+++ b/gcc/tree-ssa-propagate.h
@@ -0,0 +1,62 @@
+/* Data structures and function declarations for the SSA value propagation
+   engine.
+   Copyright (C) 2001, 2003, 2004 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 2, 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 COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#ifndef _TREE_SSA_PROPAGATE_H
+#define _TREE_SSA_PROPAGATE_H 1
+
+/* Use the TREE_VISITED bitflag to mark statements and PHI nodes that
+   have been deemed varying and should not be simulated again.  */
+#define DONT_SIMULATE_AGAIN(T)	TREE_VISITED (T)
+
+/* 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 exectuable.  */
+    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) (tree, edge *, tree *);
+typedef enum ssa_prop_result (*ssa_prop_visit_phi_fn) (tree);
+
+void ssa_propagate (ssa_prop_visit_stmt_fn, ssa_prop_visit_phi_fn);
+tree get_rhs (tree);
+bool set_rhs (tree *, tree);
+
+#endif /* _TREE_SSA_PROPAGATE_H  */