From 0b3ebd841f498a73fef0c7ed9de731b0d69d3bb4 Mon Sep 17 00:00:00 2001
From: Wu Mianzhi <10215501411@stu.ecnu.edu.cn>
Date: Sat, 17 Sep 2022 12:55:18 +0800
Subject: [PATCH] fix quiz7

---
 lab2/datalab-handout/bits.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lab2/datalab-handout/bits.c b/lab2/datalab-handout/bits.c
index 84e6363..48d604c 100644
--- a/lab2/datalab-handout/bits.c
+++ b/lab2/datalab-handout/bits.c
@@ -252,13 +252,14 @@ int conditional(int x, int y, int z) {
 int isLessOrEqual(int x, int y) {
   int signx = x >> 31;
   int signy = y >> 31;
-  int isnegpos = (signx ^ signy) & (~signx); // 0xFFFFF if signx = 1 sign y = 0
+  int isnegpos = (signx ^ signy) & (signx); // 0xFFFFF if signx = 1 sign y = 0
+  int isposneg = (signx ^ signy) & (signy);
   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;
+  int res = !!isnegpos | (!isnegpos & !signdiff & !isposneg);
   return res;
 }
 //4