--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/tree-affine.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,82 @@
+/* Operations with affine combinations of trees.
+   Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
+   
+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/>.  */
+
+/* Affine combination of trees.  We keep track of at most MAX_AFF_ELTS elements
+   to make things simpler; this is sufficient in most cases.  */
+
+#define MAX_AFF_ELTS 8
+
+/* Element of an affine combination.  */
+
+struct aff_comb_elt
+{
+  /* The value of the element.  */
+  tree val;
+  
+  /* Its coefficient in the combination.  */
+  double_int coef;
+};
+
+typedef struct affine_tree_combination
+{
+  /* Type of the result of the combination.  */
+  tree type;
+
+  /* Constant offset.  */
+  double_int offset;
+
+  /* Number of elements of the combination.  */
+  unsigned n;
+
+  /* Elements and their coefficients.  Type of elements may be different from
+     TYPE, but their sizes must be the same (STRIP_NOPS is applied to the
+     elements).
+     
+     The coefficients are always sign extended from the precision of TYPE
+     (regardless of signedness of TYPE).  */
+  struct aff_comb_elt elts[MAX_AFF_ELTS];
+
+  /* Remainder of the expression.  Usually NULL, used only if there are more
+     than MAX_AFF_ELTS elements.  Type of REST will be either sizetype for 
+     TYPE of POINTER_TYPEs or TYPE.  */
+  tree rest;
+} aff_tree;
+
+double_int double_int_ext_for_comb (double_int, aff_tree *);
+void aff_combination_const (aff_tree *, tree, double_int);
+void aff_combination_elt (aff_tree *, tree, tree);
+void aff_combination_scale (aff_tree *, double_int);
+void aff_combination_mult (aff_tree *, aff_tree *, aff_tree *);
+void aff_combination_add (aff_tree *, aff_tree *);
+void aff_combination_add_elt (aff_tree *, tree, double_int);
+void aff_combination_remove_elt (aff_tree *, unsigned);
+void aff_combination_convert (aff_tree *, tree);
+void tree_to_aff_combination (tree, tree, aff_tree *);
+tree aff_combination_to_tree (aff_tree *);
+void unshare_aff_combination (aff_tree *);
+bool aff_combination_constant_multiple_p (aff_tree *, aff_tree *, double_int *);
+void aff_combination_expand (aff_tree *, struct pointer_map_t **);
+void tree_to_aff_combination_expand (tree, tree, aff_tree *,
+				     struct pointer_map_t **);
+void get_inner_reference_aff (tree, aff_tree *, double_int *);
+void free_affine_expand_cache (struct pointer_map_t **);
+
+/* Debugging functions.  */
+void print_aff (FILE *, aff_tree *);
+void debug_aff (aff_tree *);