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Rookie
Karma Points: 21
Respect (36%):
Date Posted: 10/12/2007 10:50:39 AM  Status: Live
Assembly Language
Course Textbook Chapter Problem
Computer Architecture N/A N/A N/A
Question Details:
 

Q#1.

 

 

If AX=8FFF and BX=0FFF and “cmp ax, bx” is executed, which of the following jumps will be taken? Each part is independent of others. Also give the value of Z, S, and C flags.

                                                              i.      jg greater

                                                            ii.      jl smaller

                                                          iii.      ja above

                                                          iv.      jb below

 

Instructions

Jump

ZF

SF

CF

Jg greater

 

 

 

 

Jl smaller

 

 

 

 

Ja above

 

 

 

 

Jb below

 

 

 

 

Answers:

Member's Avatar
Guru
Karma Points: 1,806
Date Posted: 10/12/2007 12:18:27 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
 

Instructions

Jump

ZF

SF

CF

Jg greater

 Not taken

 0

 1

 0

Jl smaller

 taken

 0

 1

 0

Ja above

 taken

 0

1 

0 

Jb below

 Not taken

 0

1 

0 
M Asad's Comment:
Thanks
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Member's Avatar
Pupil
Karma Points: 51
Date Posted: 10/12/2007 12:24:53 PM  Status: Live
Asker's Rating: Helpful   
Response:
INSTRUCTION    OPERATION                                      FLAGS
                                                            C (carry)                   Z(zero)                  S(sign)
CMP AX, BX          
 
  JG                         AX > BX       
                            8FFF > 0FFF           0                               0                             0
 
  JL                           AX < BX       
                             8FFF < 0FFF          0                               0                             0
 
  JA                           BX < AX       
                             0FFF < 8FFF          1                               0                             1
 
 JB                           BX < AX       
                             0FFF < 8FFF          1                               0                             1
                               
                               
                               
M Asad's Comment:
Thanks



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