How to loop in assembly language

loops assembly x86 masm irvine32
TMan picture TMan · Nov 28, 2011 · Viewed 9.6k times · Source

How would I calculate the first 12 values in the Fibonacci number sequence and be able to place it in EAX reg. and display calling DumpRegs? Using Indirect addressing I know I need a for loop here but I'm not sure how to even go about this. Any help or tips are appreciated. 

      INCLUDE Irvine32.inc

; (insert symbol definitions here)

.data

; (insert variables here)
   Fibonacci BYTE 1, 1, 10 DUP (?)

.code
main PROC

; (insert executable instructions here)


    ; (This below will show hexa contents of string.)
      mov   esi, OFFSET Fibonacci       ; offset the variables
      mov   ebx,1                   ; byte format
      mov   ecx, SIZEOF Fibonacci       ; counter
      call  dumpMem 


    exit        ; exit to operating system
main ENDP

; (insert additional procedures here)

END main

Answer

Cyclonecode picture Cyclonecode · Nov 28, 2011

You can make a loop like this:

mov ecx,12
your_label:
; your code
loop your_label

The loop instruction decrements ecx and jumps to the specified label unless ecx is equal to zero. You could also construct the same loop like this:

mov ecx,12
your_label:
; your code
dec ecx
jnz your_label

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