gcc/testsuite/gcc.c-torture/execute/pr61306-2.c

   1 #ifdef __INT16_TYPE__
   2 typedef __INT16_TYPE__ int16_t;
   3 #else
   4 typedef short int16_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)(int16_t)(x) & (uint32_t)0x00ffff00UL) <<  8) |   \
  16         (((uint32_t)         (x) & (uint32_t)0x00ff0000UL) >>  8) |   \
  17         (((uint32_t)         (x) & (uint32_t)0xff000000UL) >> 24)))
  18
  19
  20 /* Previous version of bswap optimization failed to consider sign extension
  21    and as a result would replace an expression *not* doing a bswap by a
  22    bswap.  */
  23
  24 __attribute__ ((noinline, noclone)) uint32_t
  25 fake_bswap32 (uint32_t in)
  26 {
  27   return __fake_const_swab32 (in);
  28 }
  29
  30 int
  31 main(void)
  32 {
  33   if (sizeof (uint32_t) * __CHAR_BIT__ != 32)
  34     return 0;
  35   if (sizeof (int16_t) * __CHAR_BIT__ != 16)
  36     return 0;
  37   if (fake_bswap32 (0x81828384) != 0xff838281)
  38     __builtin_abort ();
  39   return 0;
  40 }