.if marks the beginning of a section of code which is only
considered part of the source program being assembled if the argument
(which must be an absolute expression) is non-zero. The end of
the conditional section of code must be marked by .endif
(see section .endif); optionally, you may include code for the
alternative condition, flagged by .else (see section .else).
The following variants of .if are also supported:
.ifdef symbol
Assembles the following section of code if the specified symbol
has been defined.
.ifndef symbol
.ifnotdef symbol
Assembles the following section of code if the specified symbol
has not been defined. Both spelling variants are equivalent.
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by root on January, 30 2002
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