re PR fortran/34706 (FE should reuse array temporaries, reduce temporaties and…

re PR fortran/34706 (FE should reuse array temporaries, reduce temporaties and tell ME the array-size type)

2008-01-08  Richard Guenther  <rguenther@suse.de>

	PR fortran/34706
	PR tree-optimization/34683
	* trans-types.c (gfc_get_array_type_bounds): Use an array type
	with known size for accesses if that is known.

From-SVN: r131404

gcc/fortran/ChangeLog

+2008-01-08  Richard Guenther  <rguenther@suse.de>
+
+	PR fortran/34706
+	PR tree-optimization/34683
+	* trans-types.c (gfc_get_array_type_bounds): Use an array type
+	with known size for accesses if that is known.
+
 2008-01-08  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/34476

gcc/fortran/trans-types.c

@@ -1436,7 +1436,7 @@ gfc_get_array_type_bounds (tree etype, int dimen, tree * lbound,
 			   enum gfc_array_kind akind)
 {
   char name[8 + GFC_RANK_DIGITS + GFC_MAX_SYMBOL_LEN];
-  tree fat_type, base_type, arraytype, lower, upper, stride, tmp;
+  tree fat_type, base_type, arraytype, lower, upper, stride, tmp, rtype;
   const char *typename;
   int n;
 
@@ -1511,10 +1511,15 @@ gfc_get_array_type_bounds (tree etype, int dimen, tree * lbound,
   /* TODO: known offsets for descriptors.  */
   GFC_TYPE_ARRAY_OFFSET (fat_type) = NULL_TREE;
 
-  /* We define data as an unknown size array. Much better than doing
-     pointer arithmetic.  */
-  arraytype =
-    build_array_type (etype, gfc_array_range_type);
+  /* We define data as an array with the correct size if possible.
+     Much better than doing pointer arithmetic.  */
+  if (stride)
+    rtype = build_range_type (gfc_array_index_type, gfc_index_zero_node,
+			      int_const_binop (MINUS_EXPR, stride,
+					       integer_one_node, 0));
+  else
+    rtype = gfc_array_range_type;
+  arraytype = build_array_type (etype, rtype);
   arraytype = build_pointer_type (arraytype);
   GFC_TYPE_ARRAY_DATAPTR_TYPE (fat_type) = arraytype;