深入理解計算機系統閱讀筆記-優化程序性能

1。memory aliasing problem

void t(int *x, int *y)
{
  *x += *y;
  *x += *y;
}

void t2(int *x, int *y)
{
  *x += 2* *y;
}

point the differ of the two functions. why function t can't be optimized to function t2 ?