Creating a MASM loop with the condition either above or below the block to execute (e.g. a while vs do..while loop in C)

LoopExample.asm

; Description:
; This program demonstrates how to
; create a while-style loop with the
; condition either above or below
; the block of code to execute.

; Author: Christian Di Lorenzo

INCLUDE Irvine32.inc

.data
    n BYTE 10

.code
main PROC
    ; Method 1: Pre-test condition
    xor eax, eax     ; clear EAX register
    movzx ecx, n     ; track how many times to loop
Loop1:
    cmp ecx, 0       ; check if done looping
    je EndLoop1      ; jump outside of loop if done
    add eax, ecx     ; [Loop] sum first ecx integers
    dec ecx          ; [Loop] decrement counter
    jmp Loop1        ; jump to beginning of loop
EndLoop1:
    call DumpRegs

    ; Method 2: Post-test condition
    xor eax, eax      ; clear EAX register
    movzx ecx, n      ; track how many times to loop
    jmp TestCondition ; jump immediately to bottom for checking condition
Loop2:
    add eax, ecx      ; [Loop] sum first ecx integers
    dec ecx           ; [Loop] decrement counter
TestCondition:
    cmp ecx, 0        ; check if done looping
    jne Loop2         ; jump to beginning of loop if not done
EndLoop:
    call DumpRegs

    exit
main ENDP

END main

even though in the loop2 you only used the Loop2 label in a jump statement, it was helpful to see testcondition and endloop labels written explicitely too.

Excellent, @developer-juice. Glad it was helpful.