[patch] Fix PR middle-end/18005.

[patch] Fix PR middle-end/18005.

[Sebastian Pop]

Hello, 

The following patch fixes PR18005 by ensuring that the arguments of
EXACT_DIV_EXPR are INTEGER_CST.

Bootstrapped and tested on i686-pc-linux-gnu.

Sebastian

	* tree-data-ref.c (estimate_niter_from_size_of_data): Ensure 
	that arguments of EXACT_DIV_EXPR are INTEGER_CST.

Index: tree-data-ref.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-data-ref.c,v
retrieving revision 2.12
diff -d -u -p -r2.12 tree-data-ref.c
--- tree-data-ref.c	13 Oct 2004 11:58:10 -0000	2.12
+++ tree-data-ref.c	19 Oct 2004 09:52:09 -0000
@@ -513,11 +513,13 @@ estimate_niter_from_size_of_data (struct
   array_size = TYPE_SIZE (TREE_TYPE (opnd0));
   element_size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (opnd0)));
   if (array_size == NULL_TREE 
-      || element_size == NULL_TREE)
+      || element_size == NULL_TREE
+      || TREE_CODE (array_size) != INTEGER_CST
+      || TREE_CODE (element_size) != INTEGER_CST)
     return;
 
   data_size = fold (build2 (EXACT_DIV_EXPR, integer_type_node, 
-			   array_size, element_size));
+			    array_size, element_size));
 
   if (init != NULL_TREE
       && step != NULL_TREE