Question

Write a .asm program that computes the Nth Fibonacci number. N will be provided in R0 and the output should be in R1

Answer 1

        AREA    RESET, CODE, READONLY
        ENTRY

start   MOV     R1, #16     ; n = 16
        MOV     R3, #0      ; fn1 = 0
        MOV     R0, #1      ; fn = 1
        MOV     R2, #1      ; curr = 1
whn     CMP     R2, R1      ; while (curr < 1)
        BHS     endwhn      ; {
        ADD     R2, R2, #1  ;   curr = curr + 1
        MOV     R4, R0      ;   tmp = fn
        ADD     R0, R0, R3  ;   fn = fn + fn1
        MOV     R3, R4      ;   fn1 = tmp
        B       whn         ; }
endwhn

STOP    B       STOP

        END

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