Question

Using ARM assembly, write a procedure call that compares registers R1 and R2, returning the lower value in register R0 and printing that value.

Your main function will contain a loop that continuously checks for keyboard input in the following pattern:

<operand_1><enter>

<operation_code><enter>

<operand_2><enter>

Example output:

100

m

200

100 <-Result

Answer 1

#LOOP : MOV R0 , #0 initial value of R0=0

MOV R1 , #DATA R1<-100

MOV R2 , #DATA R2<-200

CMP R1 , R2 (100 CMP 200) <- (R1-R2) <- (100-200)

JNC * jump to * memory location when Carry =0 Carry=1(when R1<R2) ; Carry=0(when R1>R2)

MOV RO , R1 if Carry=1 i.e, R1 is smaller than R2 so we sent R1 to register R0

* MOV R0 , R2 if Carry=0 i.e, R1 is greater than R2 so we sent R2 to register R0

LOOP #

END