IF1              Assemble If Pass 1                            MASM Directive

IF1
statements
[ELSE
statements]
ENDIF

Initiates a conditional block, causing assembly of the statements up
to the optional ELSE directive, provided the current assembly pass is
Pass 1.

Notes:     IF1 tests only for the current assembly pass, and
therefore takes no expression argument.

See also: IF2

IF1 Assemble If Pass 1