Makefile.in (OBJS-common): Add tree-chrec.o.

	* Makefile.in (OBJS-common): Add tree-chrec.o.
	(tree-chrec.o): New rule.
	(GTFILES): Add tree-chrec.h.
	* gengtype.c (open_base_files): Add tree-chrec.h.
	* tree-chrec.c: New file.
	* tree-chrec.h: New file.
	* tree.def (SCEV_KNOWN, SCEV_NOT_KNOWN, POLYNOMIAL_CHREC): New nodes.

From-SVN: r83909

gcc/ChangeLog

+2004-06-30  Sebastian Pop  <pop@cri.ensmp.fr>
+
+	* Makefile.in (OBJS-common): Add tree-chrec.o.
+	(tree-chrec.o): New rule.
+	(GTFILES): Add tree-chrec.h.
+	* gengtype.c (open_base_files): Add tree-chrec.h.
+	* tree-chrec.c: New file.
+	* tree-chrec.h: New file.
+	* tree.def (SCEV_KNOWN, SCEV_NOT_KNOWN, POLYNOMIAL_CHREC): New nodes.
+
 2004-06-30  Roger Sayle  <roger@eyesopen.com>
 
 	* combine.c: Include "output.h" to define dump_file.

gcc/Makefile.in

@@ -885,6 +885,7 @@ C_OBJS = c-parse.o c-lang.o stub-objc.o $(C_AND_OBJC_OBJS)
 # Language-independent object files.
 
 OBJS-common = \
+ tree-chrec.o                                                              \
  tree-cfg.o tree-dfa.o tree-eh.o tree-ssa.o tree-optimize.o tree-gimple.o  \
  tree-alias-type.o gimplify.o tree-pretty-print.o tree-into-ssa.o          \
  tree-outof-ssa.o tree-alias-common.o tree-ssa-ccp.o tree-vn.o             \
@@ -1699,6 +1700,8 @@ gimple-low.o : gimple-low.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) errors.h \
 tree-browser.o : tree-browser.c tree-browser.def $(CONFIG_H) $(SYSTEM_H) \
    $(TREE_H) errors.h tree-inline.h diagnostic.h $(HASHTAB_H) \
    $(TM_H) coretypes.h
+tree-chrec.o: tree-chrec.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) \
+   errors.h $(GGC_H) $(TREE_H) tree-chrec.h tree-pass.h
 tree-gimple.o : tree-gimple.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(EXPR_H) \
 	$(RTL_H) $(TREE_GIMPLE_H) $(TM_H) coretypes.h bitmap.h $(GGC_H)
 tree-mudflap.o : $(CONFIG_H) errors.h $(SYSTEM_H) $(TREE_H) tree-inline.h \
@@ -2339,6 +2342,7 @@ GTFILES = $(srcdir)/input.h $(srcdir)/coretypes.h \
   $(srcdir)/tree-iterator.c $(srcdir)/gimplify.c \
   $(srcdir)/tree-alias-type.h $(srcdir)/tree-alias-common.h \
   $(srcdir)/tree-alias-type.c $(srcdir)/tree-alias-common.c \
+  $(srcdir)/tree-chrec.h \
   $(srcdir)/tree-ssa-operands.h $(srcdir)/tree-ssa-operands.c \
   $(srcdir)/tree-profile.c $(srcdir)/rtl-profile.c $(srcdir)/tree-nested.c \
   $(out_file) \

gcc/gengtype.c

@@ -1110,6 +1110,7 @@ open_base_files (void)
       "libfuncs.h", "debug.h", "ggc.h", "cgraph.h",
       "tree-alias-type.h", "tree-flow.h", "reload.h",
       "cpp-id-data.h",
+      "tree-chrec.h",
       NULL
     };
     const char *const *ifp;

gcc/tree-chrec.h

+/* Chains of recurrences.
+   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+   Contributed by Sebastian Pop <s.pop@laposte.net>
+
+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 GCC_TREE_CHREC_H
+#define GCC_TREE_CHREC_H
+
+/* Accessors for the chains of recurrences.  */
+#define CHREC_VAR(NODE)           TREE_OPERAND (NODE, 0)
+#define CHREC_LEFT(NODE)          TREE_OPERAND (NODE, 1)
+#define CHREC_RIGHT(NODE)         TREE_OPERAND (NODE, 2)
+#define CHREC_VARIABLE(NODE)      TREE_INT_CST_LOW (CHREC_VAR (NODE))
+
+
+
+/* The following trees are unique elements.  Thus the comparison of another 
+   element to these elements should be done on the pointer to these trees, 
+   and not on their value.  */
+
+extern tree chrec_not_analyzed_yet;
+extern GTY(()) tree chrec_dont_know;
+extern GTY(()) tree chrec_known;
+
+/* After having added an automatically generated element, please
+   include it in the following function.  */
+
+static inline bool
+automatically_generated_chrec_p (tree chrec)
+{
+  return (chrec == chrec_not_analyzed_yet 
+	  || chrec == chrec_dont_know
+	  || chrec == chrec_known);
+}
+
+/* The tree nodes aka. CHRECs.  */
+
+static inline bool
+tree_is_chrec (tree expr)
+{
+  if (TREE_CODE (expr) == POLYNOMIAL_CHREC
+      || automatically_generated_chrec_p (expr))
+    return true;
+  else
+    return false;
+}
+
+
+
+/* Chrec folding functions.  */
+extern tree chrec_fold_plus (tree, tree, tree);
+extern tree chrec_fold_minus (tree, tree, tree);
+extern tree chrec_fold_multiply (tree, tree, tree);
+extern tree chrec_convert (tree, tree);
+extern tree count_ev_in_wider_type (tree, tree);
+extern tree chrec_type (tree);
+
+/* Operations.  */
+extern tree chrec_apply (unsigned, tree, tree);
+extern tree chrec_replace_initial_condition (tree, tree);
+extern tree update_initial_condition_to_origin (tree);
+extern tree initial_condition (tree);
+extern tree evolution_part_in_loop_num (tree, unsigned);
+extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned);
+extern tree reset_evolution_in_loop (unsigned, tree, tree);
+extern tree chrec_merge (tree, tree);
+
+/* Observers.  */
+extern bool is_multivariate_chrec (tree);
+extern bool chrec_is_positive (tree, bool *);
+extern bool chrec_contains_symbols (tree);
+extern bool chrec_contains_symbols_defined_in_loop (tree, unsigned);
+extern bool chrec_contains_undetermined (tree);
+extern bool tree_contains_chrecs (tree);
+extern bool evolution_function_is_affine_multivariate_p (tree);
+extern bool evolution_function_is_univariate_p (tree);
+
+
+
+/* Build a polynomial chain of recurrence.  */
+
+static inline tree 
+build_polynomial_chrec (unsigned loop_num, 
+			tree left, 
+			tree right)
+{
+  if (left == chrec_dont_know
+      || right == chrec_dont_know)
+    return chrec_dont_know;
+
+  return build (POLYNOMIAL_CHREC, TREE_TYPE (left), 
+		build_int_2 (loop_num, 0), left, right);
+}
+
+
+
+/* Observers.  */
+
+/* Determines whether CHREC is equal to zero.  */
+
+static inline bool 
+chrec_zerop (tree chrec)
+{
+  if (chrec == NULL_TREE)
+    return false;
+  
+  if (TREE_CODE (chrec) == INTEGER_CST)
+    return integer_zerop (chrec);
+  
+  return false;
+}
+
+/* Determines whether the expression CHREC is a constant.  */
+
+static inline bool 
+evolution_function_is_constant_p (tree chrec)
+{
+  if (chrec == NULL_TREE)
+    return false;
+
+  switch (TREE_CODE (chrec))
+    {
+    case INTEGER_CST:
+    case REAL_CST:
+      return true;
+      
+    default:
+      return false;
+    }
+}
+
+/* Determine whether the given tree is an affine evolution function or not.  */
+
+static inline bool 
+evolution_function_is_affine_p (tree chrec)
+{
+  if (chrec == NULL_TREE)
+    return false;
+  
+  switch (TREE_CODE (chrec))
+    {
+    case POLYNOMIAL_CHREC:
+      if (evolution_function_is_constant_p (CHREC_LEFT (chrec))
+	  && evolution_function_is_constant_p (CHREC_RIGHT (chrec)))
+	return true;
+      else
+	return false;
+      
+    default:
+      return false;
+    }
+}
+
+/* Determine whether the given tree is an affine or constant evolution
+   function.  */
+
+static inline bool 
+evolution_function_is_affine_or_constant_p (tree chrec)
+{
+  return evolution_function_is_affine_p (chrec) 
+    || evolution_function_is_constant_p (chrec);
+}
+
+/* Determines whether EXPR does not contains chrec expressions.  */
+
+static inline bool
+tree_does_not_contain_chrecs (tree expr)
+{
+  return !tree_contains_chrecs (expr);
+}
+
+/* Determines whether CHREC is a loop invariant with respect to LOOP_NUM.  
+   Set the result in RES and return true when the property can be computed.  */
+
+static inline bool
+no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res)
+{
+  tree scev;
+  
+  if (chrec == chrec_not_analyzed_yet
+      || chrec == chrec_dont_know
+      || chrec_contains_symbols_defined_in_loop (chrec, loop_num))
+    return false;
+
+  scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num);
+  *res = !tree_is_chrec (scev);
+  return true;
+}
+
+#endif  /* GCC_TREE_CHREC_H  */

gcc/tree.def

@@ -898,6 +898,18 @@ DEFTREECODE (CATCH_EXPR, "catch_expr", 's', 2)
    expanding.  */
 DEFTREECODE (EH_FILTER_EXPR, "eh_filter_expr", 's', 2)
 
+/* Node used for describing a property that is known at compile
+   time.  */
+DEFTREECODE (SCEV_KNOWN, "scev_known", 'e', 0)
+
+/* Node used for describing a property that is not known at compile
+   time.  */
+DEFTREECODE (SCEV_NOT_KNOWN, "scev_not_known", 'e', 0)
+
+/* Polynomial chains of recurrences.
+   Under the form: cr = {CHREC_LEFT (cr), +, CHREC_RIGHT (cr)}.  */
+DEFTREECODE (POLYNOMIAL_CHREC, "polynomial_chrec", 'e', 3)
+
 /* Used to chain children of container statements together.
    Use the interface in tree-iterator.h to access this node.  */
 DEFTREECODE (STATEMENT_LIST, "statement_list", 'x', 0)