34. LOOP Instruction

Loop 50 times example:

    mov    ecx, 50
repeat:
    ; loop body:
    ..
    loop   repeat
    ..

Equivalent to:

    mov    ecx, 50
repeat:
    ; loop body:
    ..
    dec   ecx
    jnz   repeat
    ..

Surprisingly,

    dec   ecx
    jnz   repeat 

executes faster than

    loop  repeat