modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/pr65215-2.c (about)

     1  /* PR tree-optimization/65215 */
     2  
     3  static inline unsigned int
     4  foo (unsigned int x)
     5  {
     6    return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
     7  }
     8  
     9  __attribute__((noinline, noclone)) unsigned long long
    10  bar (unsigned long long *x)
    11  {
    12    return ((unsigned long long) foo (*x) << 32) | foo (*x >> 32);
    13  }
    14  
    15  int
    16  main ()
    17  {
    18    if (__CHAR_BIT__ != 8 || sizeof (unsigned int) != 4 || sizeof (unsigned long long) != 8)
    19      return 0;
    20    unsigned long long l = foo (0xfeedbea8U) | ((unsigned long long) foo (0xdeadbeefU) << 32);
    21    if (bar (&l) != 0xfeedbea8deadbeefULL)
    22      __builtin_abort ();
    23    return 0;
    24  }