From 7a3d074281840bb5b75bb5ed19805609dc3ef84c Mon Sep 17 00:00:00 2001
From: Wu Mianzhi <10215501411@stu.ecnu.edu.cn>
Date: Fri, 16 Sep 2022 22:53:01 +0800
Subject: [PATCH] finish quiz7

---
 lab2/datalab-handout/bits.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lab2/datalab-handout/bits.c b/lab2/datalab-handout/bits.c
index 42b53b7..8e0427c 100644
--- a/lab2/datalab-handout/bits.c
+++ b/lab2/datalab-handout/bits.c
@@ -250,7 +250,16 @@ int conditional(int x, int y, int z) {
  *   Rating: 3
  */
 int isLessOrEqual(int x, int y) {
-  return 2;
+  int signx = x >> 31;
+  int signy = y >> 31;
+  int isnegpos = signx ^ signy & signx; // 0xFFFFF if signx = 1 sign y = 0
+  int sign1 = ~(1 << 31); // 01111111...111
+  int absx = x & sign1;
+  int absy = y & sign1;
+  int diff = absy + (~absx) + 1;
+  int signdiff = diff >> 31;
+  int res = !isnegpos & !signdiff;
+  return res;
 }
 //4
 /*