modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/pr86844.c (about)

     1  /* PR tree-optimization/86844 */
     2  
     3  __attribute__((noipa)) void
     4  foo (int *p)
     5  {
     6    *p = 0;
     7    *((char *)p + 3) = 1;
     8    *((char *)p + 1) = 2;
     9    *((char *)p + 2) = *((char *)p + 6);
    10  }
    11  
    12  int
    13  main ()
    14  {
    15    int a[2] = { -1, 0 };
    16    if (sizeof (int) != 4)
    17      return 0;
    18    ((char *)a)[6] = 3;
    19    foo (a);
    20    if (((char *)a)[0] != 0 || ((char *)a)[1] != 2
    21        || ((char *)a)[2] != 3 || ((char *)a)[3] != 1)
    22      __builtin_abort ();
    23    return 0;
    24  }