/* PR tree-optimization/20742 */intfoo (int x, int y){  register int a = y + 57;  register int b = y + 31;  while (x-- > 0)    { #define TEN(x) x x x x x x x x x x      TEN (TEN (a += b; b -= a;))      TEN (TEN (a += b; b -= a;))    }  return a + b;}