gcc/testsuite/gcc.c-torture/execute/bitfld-6.c

   1 /* { dg-require-effective-target int32plus } */
   2 union U
   3 {
   4   const int a;
   5   unsigned b : 20;
   6 };
   7
   8 static union U u = { 0x12345678 };
   9
  10 /* Constant folding used to fail to account for endianness when folding a
  11    union.  */
  12
  13 int
  14 main (void)
  15 {
  16 #ifdef __BYTE_ORDER__
  17 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  18   return u.b - 0x45678;
  19 #else
  20   return u.b - 0x12345;
  21 #endif
  22 #endif
  23   return 0;
  24 }