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LC-3 help! Count Controlled Loop

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First post on here, so expect some shoddy stuff.

My professor gave us a sample code which we were suppose to edit,

"Change this program to loop until it encounters a sentinel value, which is a negative number. The data begins at x3100. Use only one branch command. There will always be at least one positive integer in the list. "

Well I did that and the professor gave me a 0 because of "Count Controlled Loop submitted." I'm lost as to I only know the one way to do a loop?

.ORIG x3100 

LEA R1, xFF 

AND R3, R3, #0 

AND R2, R2, #0 

ADD R2, R2, #12 

ADD R3, R3, R4 

ADD R1, R1, #1 

ADD R2, R2, #-1 

BRzp -4 

.END

loops lc3

share|improve this question

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What LC3 assembler are you using?
  
  – Nick ODell
  Mar 29 at 14:12
  

  
  
  
  

add a comment
 | 

0

First post on here, so expect some shoddy stuff.

My professor gave us a sample code which we were suppose to edit,

"Change this program to loop until it encounters a sentinel value, which is a negative number. The data begins at x3100. Use only one branch command. There will always be at least one positive integer in the list. "

Well I did that and the professor gave me a 0 because of "Count Controlled Loop submitted." I'm lost as to I only know the one way to do a loop?

.ORIG x3100 

LEA R1, xFF 

AND R3, R3, #0 

AND R2, R2, #0 

ADD R2, R2, #12 

ADD R3, R3, R4 

ADD R1, R1, #1 

ADD R2, R2, #-1 

BRzp -4 

.END

loops lc3

share|improve this question

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What LC3 assembler are you using?
  
  – Nick ODell
  Mar 29 at 14:12
  

  
  
  
  

add a comment
 | 

First post on here, so expect some shoddy stuff.

My professor gave us a sample code which we were suppose to edit,

"Change this program to loop until it encounters a sentinel value, which is a negative number. The data begins at x3100. Use only one branch command. There will always be at least one positive integer in the list. "

Well I did that and the professor gave me a 0 because of "Count Controlled Loop submitted." I'm lost as to I only know the one way to do a loop?

.ORIG x3100 

LEA R1, xFF 

AND R3, R3, #0 

AND R2, R2, #0 

ADD R2, R2, #12 

ADD R3, R3, R4 

ADD R1, R1, #1 

ADD R2, R2, #-1 

BRzp -4 

.END

loops lc3

share|improve this question

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge

.ORIG x3100 

LEA R1, xFF 

AND R3, R3, #0 

AND R2, R2, #0 

ADD R2, R2, #12 

ADD R3, R3, R4 

ADD R1, R1, #1 

ADD R2, R2, #-1 

BRzp -4 

.END

share|improve this question

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge

share|improve this question

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

edited Mar 28 at 21:14

cybernetic.nomad

4,14322 gold badges1313 silver badges2626 bronze badges

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge

asked Mar 28 at 20:36

Andrew DaiseyAndrew Daisey

111 bronze badge