typeck.c (build_ptrmemfunc): Just reinterpret if there's no adjustment necessary.

        * typeck.c (build_ptrmemfunc): Just reinterpret if there's no
        adjustment necessary.

From-SVN: r35954

gcc/cp/ChangeLog

+2000-08-24  Jason Merrill  <jason@redhat.com>
+
+	* typeck.c (build_ptrmemfunc): Just reinterpret if there's no
+	adjustment necessary.
+
 2000-08-24  Greg McGary  <greg@mcgary.org>
 
 	* cp-tree.h (MAIN_NAME_P): Remove macro.

gcc/cp/typeck.c

@@ -6125,12 +6125,21 @@ build_ptrmemfunc (type, pfn, force)
 	cp_error ("invalid conversion to type `%T' from type `%T'", 
 		  to_type, pfn_type);
 
+      n = get_delta_difference (TYPE_PTRMEMFUNC_OBJECT_TYPE (pfn_type),
+				TYPE_PTRMEMFUNC_OBJECT_TYPE (to_type),
+				force);
+
       /* We don't have to do any conversion to convert a
 	 pointer-to-member to its own type.  But, we don't want to
 	 just return a PTRMEM_CST if there's an explicit cast; that
 	 cast should make the expression an invalid template argument.  */
-      if (TREE_CODE (pfn) != PTRMEM_CST && same_type_p (to_type, pfn_type))
-	return pfn;
+      if (TREE_CODE (pfn) != PTRMEM_CST)
+	{
+	  if (same_type_p (to_type, pfn_type))
+	    return pfn;
+	  else if (integer_zerop (n))
+	    return build_reinterpret_cast (to_type, pfn);
+	}
 
       if (TREE_SIDE_EFFECTS (pfn))
 	pfn = save_expr (pfn);
@@ -6142,9 +6151,6 @@ build_ptrmemfunc (type, pfn, force)
 	  npfn = build_component_ref (pfn, pfn_identifier, NULL_TREE, 0);
 	  delta = build_component_ref (pfn, delta_identifier, NULL_TREE, 0);
 	  delta = cp_convert (ptrdiff_type_node, delta);
-	  n = get_delta_difference (TYPE_PTRMEMFUNC_OBJECT_TYPE (pfn_type),
-				    TYPE_PTRMEMFUNC_OBJECT_TYPE (to_type),
-				    force);
 	  delta = cp_build_binary_op (PLUS_EXPR, delta, n);
 	  return build_ptrmemfunc1 (to_type, delta, NULL_TREE, npfn,
 				    NULL_TREE);
@@ -6173,9 +6179,6 @@ build_ptrmemfunc (type, pfn, force)
 	  idx = build_component_ref (pfn, index_identifier, NULL_TREE, 0);
 	}
 
-      n = get_delta_difference (TYPE_PTRMEMFUNC_OBJECT_TYPE (pfn_type),
-				TYPE_PTRMEMFUNC_OBJECT_TYPE (to_type),
-				force);
       delta = cp_build_binary_op (PLUS_EXPR, ndelta, n);
       delta2 = cp_build_binary_op (PLUS_EXPR, ndelta2, n);
       e1 = fold (build (GT_EXPR, boolean_type_node, idx, integer_zero_node));