gcc-have-sync-compare-and-swap.c: Align the 16 byte variable used for atomic operations.

2014-02-07  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* gcc.dg/gcc-have-sync-compare-and-swap.c: Align the 16 byte
	variable used for atomic operations.

From-SVN: r207600

gcc/testsuite/ChangeLog

+2014-02-07  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	* gcc.dg/gcc-have-sync-compare-and-swap.c: Align the 16 byte
+	variable used for atomic operations.
+
 2014-02-07  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/60092

gcc/testsuite/gcc.dg/gcc-have-sync-compare-and-swap.c

@@ -40,10 +40,12 @@ void f8()
 #endif
 }
 
+/* aligned (16): On S/390 16 byte compare and swap operations are only
+   available if the memory operand resides on a 16 byte boundary.  */
 void f16()
 {
 #ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
-  typedef int __attribute__ ((__mode__ (__TI__))) ti_int_type;
+  typedef int __attribute__ ((__mode__ (__TI__), aligned (16))) ti_int_type;
   ti_int_type ti_int;
   __sync_bool_compare_and_swap (&ti_int, (ti_int_type)0, (ti_int_type)1);
 #endif