Modify your code from the following code so that it it now has a “main” and a se

Question

Modify your code from the following code so that it it now has a “main” and a separate function “largest” that take 3 parameters (r0, r1, r2) and returns the largest of the three in r4. The main will load these values from memory, call the function and then store the result back into memory.

As this function is a “leaf” function, and should only use R0-R3, it can be written more simply than recursive fibonacci as it will not need to save and restore values from the stack. So this function will be structured more like function2 than function1 from the example above.

this code to find the largest number from three given number (ARM Assembly language)

adr       R0, large
       MOV       R5, #4
       ldr       R1, [R0], #4
       ldr       R2, [R0], #4
       ldr       R3, [R0], #4
       MOV       R4, #0
       CMP       R1, R2
       BMI       Big
       B       Big2
      
Big       CMP       R2, R3
       BMI       Big3
       B       Big4
      
Big2       CMP       R1, R3
       BMI       Big5
      
       MOV       R4, R1
       ldr       R0, =setlarge
       str       R4, [R0], #4
       END
      
Big4       MOV       R4, R2
       ldr       R0, =setlarge
       str       R4, [R0], #4
       END
      
Big3       MOV       R4,R3
       ldr       R0, =setlarge
       str       R4, [R0], #4
       END
      
Big5       MOV       R4,R3
       ldr       R0, =setlarge
       str       R4, [R0], #4
      
      
large   DCD       34,54,21
setlarge   DCD       0
       END

Explanation / Answer

mMov R5,#4

Idr R1,[Ro],#4

Idr R2,[Ro],#4

Idr R3,[Ro],#4

LRGT R ?

ENDS

Code segment

Assume DS:Data CS:Code

Start:

MOV AX,DATA

MOV DS,AX

MOV AL,NUM1

MOV LGRT,AL

COM AL,NUM2

JGE SKIP1

MOV AL,NUM2

MOV LGRT ,AL

SKIP1

MOV AL,LGRT

CMP AL,NUM3

JGE SKIP2

MOV AL ,NUM3

MOV LGRT,AL

SKIP 2:

MOV AH,4CH

INT 21H

ENDS ENDS START

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.