gcc/testsuite/gcc.c-torture/execute/pr61306-1.c

   1 #ifdef __INT32_TYPE__
   2 typedef __INT32_TYPE__ int32_t;
   3 #else
   4 typedef int int32_t;
   5 #endif
   6
   7 #ifdef __UINT32_TYPE__
   8 typedef __UINT32_TYPE__ uint32_t;
   9 #else
  10 typedef unsigned uint32_t;
  11 #endif
  12
  13 #define __fake_const_swab32(x) ((uint32_t)(                   \
  14         (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |    \
  15         (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |    \
  16         (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |    \
  17         (( (int32_t)(x) &  (int32_t)0xff000000UL) >> 24)))
  18
  19 /* Previous version of bswap optimization failed to consider sign extension
  20    and as a result would replace an expression *not* doing a bswap by a
  21    bswap.  */
  22
  23 __attribute__ ((noinline, noclone)) uint32_t
  24 fake_bswap32 (uint32_t in)
  25 {
  26   return __fake_const_swab32 (in);
  27 }
  28
  29 int
  30 main(void)
  31 {
  32   if (sizeof (int32_t) * __CHAR_BIT__ != 32)
  33     return 0;
  34   if (sizeof (uint32_t) * __CHAR_BIT__ != 32)
  35     return 0;
  36   if (fake_bswap32 (0x87654321) != 0xffffff87)
  37     __builtin_abort ();
  38   return 0;
  39 }