请问有没有大佬知道下面两种写法哪个时间更优一些：

int re() {
	int x = 0, f = 1;
	char ch = getchar();
	
	while (ch < '0'||ch > '9') {
		if(ch == '-') f = -1;
		ch = getchar();
	}
	
	while (ch <= '9'&&ch >= '0') {
		x = x * 10 + ch - '0';
		ch = getchar();
	}
	
	return x * f;
}

int re() {
	int x = 0, f = 1;
	char ch = getchar();
	
	while (ch < '0'||ch > '9') {
		if(ch == '-') f = -1;
		ch = getchar();
	}
	
	while (ch <= '9'&&ch >= '0') {
		x = (x << 3) + (x << 1) + ch - '0';
		ch = getchar();
	}
	
	return x * f;
}