re PR tree-optimization/21923 (Ada compiler fails to build on gcc 4.1)

2005-06-15  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/21923
        * tree-ssa.c (tree_ssa_useless_type_conversion_1): Conversions between
        integer types whos ranges are different are not useless.

From-SVN: r100996

gcc/ChangeLog

 2005-06-15  Andrew Pinski  <pinskia@physics.uc.edu>
 
+	PR tree-opt/21923
+	* tree-ssa.c (tree_ssa_useless_type_conversion_1): Conversions between
+	integer types whos ranges are different are not useless.
+
+2005-06-15  Andrew Pinski  <pinskia@physics.uc.edu>
+
 	PR tree-opt/22024
 	* tree-ssa-reassoc.c (init_reassoc): Also give chain decl a distint
 	rank.

gcc/tree-ssa.c

@@ -902,7 +902,9 @@ tree_ssa_useless_type_conversion_1 (tree outer_type, tree inner_type)
   else if (INTEGRAL_TYPE_P (inner_type)
            && INTEGRAL_TYPE_P (outer_type)
 	   && TYPE_UNSIGNED (inner_type) == TYPE_UNSIGNED (outer_type)
-	   && TYPE_PRECISION (inner_type) == TYPE_PRECISION (outer_type))
+	   && TYPE_PRECISION (inner_type) == TYPE_PRECISION (outer_type)
+	   && simple_cst_equal (TYPE_MAX_VALUE (inner_type), TYPE_MAX_VALUE (outer_type))
+	   && simple_cst_equal (TYPE_MIN_VALUE (inner_type), TYPE_MIN_VALUE (outer_type)))
     {
       bool first_boolean = (TREE_CODE (inner_type) == BOOLEAN_TYPE);
       bool second_boolean = (TREE_CODE (outer_type) == BOOLEAN_TYPE);