modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/991202-1.c (about)

     1  int x, y;
     2  
     3  int
     4  main()
     5  {
     6    x = 2;
     7    y = x;
     8    do
     9      {
    10        x = y;
    11        y = 2 * y;
    12      }
    13    while ( ! ((y - x) >= 20));
    14    exit (0);
    15  }
    16