Ами условието си го изпълнява коректно но след това не мога да накарам променливата да си промени стойността.

if - Begin Conditionally Assembled Code Block
Syntax
Preferred:

if expr
Supported:

#if expr
.if expr
Description
Begin execution of a conditional assembly block. If expr evaluates to true, the code immediately following the if will assemble. Otherwise, subsequent code is skipped until an else directive or an endif directive is encountered.

An expression that evaluates to zero is considered logically FALSE. An expression that evaluates to any other value is considered logically TRUE. The if and while directives operate on the logical value of an expression. A relational TRUE expression is guaranteed to return a nonzero value, FALSE a value of zero.

if's may be nested up to 16 deep.

Usage
This directive is used in the following types of code: absolute or relocatable. For information on types of code, see Assembler Operation.

This directive is not an instruction, but used to control how code is assembled, not how it behaves at run-time. Use this directive for conditional assembly or to check for a condition, such as to generate an error message.

if - Begin Conditionally Assembled Code Block

If - започва УСЛОВНО АСЕМБЛИРАНЕ НА КОД