🚀 go-pugleaf

/* optimizer bug in GCC 1.34 on Sun 3/50 */
/* when compiled with the -O switch, the code fails (prints "BUG") */
/* when compiled without -O, it works fine (prints "OK") */

main()
{
  int x1;
  int x2;
  int x3;
  struct {
    int x;
    int y;
  } v1, v2, v3, v4, v5;


  x1 = 3;
  x3 = 7;
  x2 = 3;

  v1.x = 0;
  v1.y = 1;
  
  v4.x = 65;
  v4.y = 15;
  
  v5.x = 58;
  v5.y = 19;

  v3.y = 0;
  v3.x = v4.x < v5.x ? 1 : -1;

  v2.x = v4.x;
  v2.y = v4.y;

  for (; x1 > 0; x1--) {

    v2.x += v1.x;
    v2.y += v1.y;

    if (x1 == x2 && x3 > 0) while(x3--) {
      v2.x += v3.x;
      v2.y += v3.y;
    }

  }

  v2.x += v1.x;
  v2.y += v1.y;

  if (!(v2.x == v5.x && v2.y == v5.y)) printf("BUG\n");
  else printf("OK\n");

}