Question

Change this program in assembly language 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.

.ORIG x3000

LEA R1, xFF

AND R3, R3, #0

AND R2, R2, #0

ADD R2, R2, #12

BRz #5

LDR R4, R1, #0

ADD R3, R3, R4

ADD R1, R1, #1

ADD R2, R2, #-1

BRnzp #-6

.END

Answer 1

.ORIG x3000

LEA R1, xFF

AND R3, R3, #0

AND R2, R2, #0

ADD R2, R2, #12

LDR R4, R1, #0

ADD R3, R3, R4

ADD R1, R1, #1

ADD R2, R2, #-1

BRnzp #-6

.END