modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/pr52760.c (about)

     1  /* PR tree-optimization/52760 */
     2  
     3  struct T { unsigned short a, b, c, d; };
     4  
     5  __attribute__((noinline, noclone)) void
     6  foo (int x, struct T *y)
     7  {
     8    int i;
     9  
    10    for (i = 0; i < x; i++)
    11      {
    12        y[i].a = ((0x00ff & y[i].a >> 8) | (0xff00 & y[i].a << 8));
    13        y[i].b = ((0x00ff & y[i].b >> 8) | (0xff00 & y[i].b << 8));
    14        y[i].c = ((0x00ff & y[i].c >> 8) | (0xff00 & y[i].c << 8));
    15        y[i].d = ((0x00ff & y[i].d >> 8) | (0xff00 & y[i].d << 8));
    16      }
    17  }
    18  
    19  int
    20  main ()
    21  {
    22    struct T t = { 0x0001, 0x0203, 0x0405, 0x0607 };
    23    foo (1, &t);
    24    if (t.a != 0x0100 || t.b != 0x0302 || t.c != 0x0504 || t.d != 0x0706)
    25      __builtin_abort ();
    26    return 0;
    27  }