At assembly time, ALP evaluates conditional assembly directives, assembling if the conditions are true. You can use conditional assembly directives when you want to test for a specified condition and assemble a block of statements if the condition is true. The IFxx and ENDIF directives enclose the statements to be considered for conditional assembly. The optional ELSEIFxx and ELSE blocks follow the IFxx directive. There are many forms of the IFxx and ELSEIFxx directives.
This section describes the following conditional assembly directives: