．(1) x = 2-011*0.100101, y = 2-010*(-0.011110)
[x]浮 = 11101,0.100101 [y]浮 = 11110,-0.011110 Ex-Ey = 11101+00010=11111 [x]浮 = 11110,0.010010(1)
x+y 0 0. 0 1 0 0 1 0 (1)
+ 1 1. 1 0 0 0 1 0
1 1. 1 1 0 1 0 0 (1)
规格化处理:
1.010010
阶码
11100
-4 -4
x-y
0 0. 0 1 0 0 1 0 (1) + 0 0. 0 1 1 1 1 0
0 0 1 1 0 0 0 0 (1)
规格化处理:
0.110000
阶码
11110
x-y=2-2*0.110001
(2) x = 2-101*(-0.010110), y = 2-100*0.010110
[x]浮= 11011,-0.010110 [y]浮= 11100,0.010110
x+y= 1.010010*2 = 2 *-0.101110
9
9
Ex-Ey = 11011+00100 = 11111 [x]浮= 11100,1.110101(0) x+y 1 1. 1 1 0 1 0 1
+ 0 0. 0 1 0 1 1 0
0 0. 0 0 1 0 1 1
规格化处理: 0.101100 阶码x+y= 0.101100*2 -6
x-y
1 1.1 1 0 1 0 1 + 1 1.1 0 1 0 1 0
1 1.0 1 1 1 1 1
规格化处理: 1.011111 阶码
x-y=-0.100001*2 -4
10．(1) Ex = 0011, Mx = 0.110100
Ey = 0100, My = 0.100100 Ez = Ex+Ey = 0111 Mx*My 0. 1 1 0 1
* 0.1 0 0 1
01101 00000 00000 01101 00000 001110101
规格化：
26*0.111011
(2) Ex = 1110, Mx = 0.011010
Ey = 0011, My = 0.111100 Ez = Ex-Ey = 1110+1101 = 1011
计算机组成原理第五版习题答案
11010
[Mx]补 = 00.011010 [My]补 = 00.111100,
11100
[-My]补 = 11.000100
10
00011010
+[-My]
11000100 11011110 10111100
+[My]
00111100 11111000 11110000
+[My]
00111100 00101100 01011000
+[-My]
11000100 00011100 00111000
+[-My]
11000100 11111100 11111000
+[My]
00111100 00110100 01101000
+[-My]
1 1 0 00 1 0 0 0 0 1 0 1 10 0
商 = 0.110110*2-6,
11．
0
0.0 0.01 0.011 0.0110 0.01101 0.01101 计算机组成原理第五版习题答案
4 位加法器如上图，
Ci?? Ai Bi?? Ai Ci??1?? Bi Ci??1 ? Ai Bi?? ( Ai?? Bi )Ci??1
