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// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/08/ProgramFlow/BasicLoop/BasicLoop.vm
// Computes the sum 1 + 2 + ... + argument[0] and pushes the
// result onto the stack. Argument[0] is initialized by the test
// script before this code starts running.
push constant 0
pop local 0 // initializes sum = 0
label LOOP_START
push argument 0
push local 0
add
pop local 0 // sum = sum + counter
push argument 0
push constant 1
sub
pop argument 0 // counter--
push argument 0
if-goto LOOP_START // If counter != 0, goto LOOP_START
push local 0
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