1  /* { dg-do run } */
       2  /* { dg-require-effective-target stdint_types } */
       3  /* { dg-options "" } */
       4  #include <stdint.h>
       5  
       6  extern void abort (void);
       7  
       8  int main (void)
       9  {
      10    uint32_t a = 4;
      11    uint32_t b;
      12  
      13    b = __builtin_bswap32 (a);
      14    a = __builtin_bswap32 (b);
      15  
      16    if (b == 4 || a != 4)
      17      abort ();
      18  
      19    return 0;
      20  }