PR c/51147 - attribute((mode(byte))) on an enum generates wrong code

gcc/testsuite/ChangeLog:
2016-02-24  Martin Sebor  <msebor@redhat.com>

        PR c/51147
        * gcc.dg/enum-mode-2.c: New test.

From-SVN: r233686

gcc/testsuite/ChangeLog

+2016-02-24  Martin Sebor  <msebor@redhat.com>
+
+	PR c/51147
+	* gcc.dg/enum-mode-2.c: New test.
+
 2016-02-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/69922

gcc/testsuite/gcc.dg/enum-mode-2.c

+/* PR c/51147 - attribute((mode(byte))) on an enum generates wrong code */
+
+/* { dg-do compile } */
+/* { dg-additional-options "-O2 -fdump-tree-optimized" } */
+
+enum _eq_bool
+{
+  false,
+  true
+} __attribute__((mode (byte)));
+
+typedef enum _eq_bool bool;
+
+bool foo (void);
+bool bar (void);
+
+bool test (void)
+{
+  return foo () || bar ();
+}
+
+/* { dg-final { scan-tree-dump-times "foo|bar" 2 "optimized" } } */