2008-07-14 Martin Jambor <mjambor@suse.cz>

[pf3gnuchains/gcc-fork.git] / gcc / tree-switch-conversion.c

diff --git a/gcc/tree-switch-conversion.c b/gcc/tree-switch-conversion.c
index 0ce5fc9..36c87f9 100644 (file)
--- a/gcc/tree-switch-conversion.c
+++ b/gcc/tree-switch-conversion.c
@@ -622,7 +622,7 @@ gen_inbound_check (tree swtch)
   tree label_decl3 = create_artificial_label ();
   tree label1, label2, label3;
 
-  tree utype = unsigned_type_for (TREE_TYPE (info.index_expr));
+  tree utype;
   tree tmp_u;
   tree cast, cast_assign;
   tree ulb, minus, minus_assign;
@@ -638,6 +638,12 @@ gen_inbound_check (tree swtch)
   gcc_assert (info.default_values);
   bb0 = bb_for_stmt (swtch);
 
+  /* Make sure we do not generate arithmetics in a subrange.  */
+  if (TREE_TYPE (TREE_TYPE (info.index_expr)))
+    utype = unsigned_type_for (TREE_TYPE (TREE_TYPE (info.index_expr)));
+  else
+    utype = unsigned_type_for (TREE_TYPE (info.index_expr));
+
   /* (end of) block 0 */
   bsi = bsi_for_stmt (info.arr_ref_first);
   tmp_u = make_rename_temp (utype, "csui");