如何处理 fitBits 中的 n=32

Question

从计算机系统：程序员的角度进行练习，这就是我想到的。不幸的是，这在 n=32 的情况下不起作用，如果 n=32 它根本不会移动 x，所以无论如何它都会返回 1。如果 x=0x80000000 这是一个问题，因为在这种情况下它应该返回 0

/* 
 * fitsBits - return 1 if x can be represented as an 
 *  n-bit, two's complement integer.
 *   1 <= n <= 32
 *   Examples: fitsBits(5,3) = 0, fitsBits(-4,3) = 1
 *   Legal ops: ! ~ & ^ | + << >>
 *   Max ops: 15
 *   Rating: 2
 */
int fitsBits(int x, int n) {
  int diff = 32 +(~n + 1);//diff between n and 32
  return !(x ^ ((x << diff) >> diff)); //shifts x left by diff then right by diff leaving the num unchanged if it would fit as an n-bit 2s comp int then xor's with x so it will be !0 if x matches shifted x or !1 otherwise
}