gcc/testsuite/gcc.c-torture/execute/pr60454.c

   1 #ifdef __UINT32_TYPE__
   2 typedef __UINT32_TYPE__ uint32_t;
   3 #else
   4 typedef unsigned uint32_t;
   5 #endif
   6
   7 #define __fake_const_swab32(x) ((uint32_t)(                           \
   8         (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |            \
   9         (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |            \
  10         (((uint32_t)(x) & (uint32_t)0x000000ffUL) <<  8) |            \
  11         (((uint32_t)(x) & (uint32_t)0x0000ff00UL)      ) |            \
  12         (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
  13
  14 /* Previous version of bswap optimization would detect byte swap when none
  15    happen. This test aims at catching such wrong detection to avoid
  16    regressions.  */
  17
  18 __attribute__ ((noinline, noclone)) uint32_t
  19 fake_swap32 (uint32_t in)
  20 {
  21   return __fake_const_swab32 (in);
  22 }
  23
  24 int main(void)
  25 {
  26   if (sizeof (uint32_t) * __CHAR_BIT__ != 32)
  27     return 0;
  28   if (fake_swap32 (0x12345678UL) != 0x78567E12UL)
  29     __builtin_abort ();
  30   return 0;
  31 }