gcc/testsuite/gcc.dg/pr40501.c

   1 /* { dg-do compile { target alpha*-*-* ia64*-*-* x86_64-*-* s390x-*-* } } */
   2 /* { dg-options "-O2" } */
   3 /* { dg-require-effective-target lp64 } */
   4
   5 /* PR middle-end/40501 */
   6
   7 /* This once failed due to the bswap pass missing to add the type
   8    casts of the signed argument and result to the proper unsigned
   9    types.  */
  10
  11 typedef long int int64_t;
  12
  13 int64_t
  14 swap64 (int64_t n)
  15 {
  16   return (((n & (((int64_t) 0xff) )) << 56) |
  17           ((n & (((int64_t) 0xff) << 8)) << 40) |
  18           ((n & (((int64_t) 0xff) << 16)) << 24) |
  19           ((n & (((int64_t) 0xff) << 24)) << 8) |
  20           ((n & (((int64_t) 0xff) << 32)) >> 8) |
  21           ((n & (((int64_t) 0xff) << 40)) >> 24) |
  22           ((n & (((int64_t) 0xff) << 48)) >> 40) |
  23           ((n & (((int64_t) 0xff) << 56)) >> 56));
  24 }