bswap-2.c: Add alignment constraints to bitfield and test wrong results instead of correct...

2014-06-06  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    * gcc.c-torture/execute/bswap-2.c: Add alignment constraints to
    bitfield and test wrong results instead of correct results to make the
    test more portable.

From-SVN: r211313

gcc/testsuite/ChangeLog

+2014-06-06  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* gcc.c-torture/execute/bswap-2.c: Add alignment constraints to
+	bitfield and test wrong results instead of correct results to make the
+	test more portable.
+
 2014-06-06  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/60432

gcc/testsuite/gcc.c-torture/execute/bswap-2.c

@@ -6,8 +6,11 @@ typedef __UINT32_TYPE__ unsigned;
 
 struct bitfield {
   unsigned char f0:7;
+  unsigned char   :1;
   unsigned char f1:7;
+  unsigned char   :1;
   unsigned char f2:7;
+  unsigned char   :1;
   unsigned char f3:7;
 };
 
@@ -74,11 +77,17 @@ main ()
     return 0;
   bfin.inval = (struct ok) { 0x83, 0x85, 0x87, 0x89 };
   out = partial_read_le32 (bfin);
-  if (out != 0x09070503 && out != 0x88868482 && out != 0x78306141)
+  /* Test what bswap would do if its check are not strict enough instead of
+     what is the expected result as there is too many possible results with
+     bitfields.  */
+  if (out == 0x89878583)
     __builtin_abort ();
   bfin.inval = (struct ok) { 0x83, 0x85, 0x87, 0x89 };
   out = partial_read_be32 (bfin);
-  if (out != 0x03050709 && out != 0x82848688 && out != 0x41613078)
+  /* Test what bswap would do if its check are not strict enough instead of
+     what is the expected result as there is too many possible results with
+     bitfields.  */
+  if (out == 0x83858789)
     __builtin_abort ();
   out = fake_read_le32 (cin, &cin[2]);
   if (out != 0x89018583)