ipa-type-escape improvements

From-SVN: r122835

gcc/ChangeLog

+2007-03-12  Olga Golovanevsky  <olga@il.ibm.com>
+  
+  	* tree.h : Add multiple_of_p declaration.
+  	* fold-const.c (multiple_of_p): Make multiple_of_p public. 
+  	* ipa-type-escape.c (results_of_malloc): Redundant.
+  	(visited_stmts): New. Visited stmt for walk_use_def_chains.
+  	(cast_type): Extended with new members.
+  	(check_cast): Returns cast_type.
+  	(cast): New structure for data of walk_use_def_chains.
+  	(is_malloc_result, is_cast_from_non_pointer_1,
+  	is_cast_from_non_pointer, 
+  	is_array_access_through_pointer_and_index): New functions.
+  	(look_for_casts): Returns cast types.
+ 	(check_call): Returns void.
+  	(okay_pointer_operation): Use support of pointer plus index,
+  	pointer plus constant and allow all multiplications.
+	
 2007-03-11  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/31115

gcc/fold-const.c

@@ -131,7 +131,6 @@ static tree fold_truthop (enum tree_code, tree, tree, tree);
 static tree optimize_minmax_comparison (enum tree_code, tree, tree, tree);
 static tree extract_muldiv (tree, tree, enum tree_code, tree, bool *);
 static tree extract_muldiv_1 (tree, tree, enum tree_code, tree, bool *);
-static int multiple_of_p (tree, tree, tree);
 static tree fold_binary_op_with_conditional_arg (enum tree_code, tree,
 						 tree, tree,
 						 tree, tree, int);
@@ -13115,7 +13114,7 @@ fold_build_call_array_initializer (tree type, tree fn,
    (where the same SAVE_EXPR (J) is used in the original and the
    transformed version).  */
 
-static int
+int
 multiple_of_p (tree type, tree top, tree bottom)
 {
   if (operand_equal_p (top, bottom, 0))

gcc/tree.h

@@ -4454,7 +4454,7 @@ enum operand_equal_flag
 };
 
 extern int operand_equal_p (tree, tree, unsigned int);
-
+extern int multiple_of_p (tree, tree, tree);
 extern tree omit_one_operand (tree, tree, tree);
 extern tree omit_two_operands (tree, tree, tree, tree);
 extern tree invert_truthvalue (tree);