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`.if ABSOLUTE EXPRESSION'
=========================

   `.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' (*note `.endif':
Endif.); optionally, you may include code for the alternative
condition, flagged by `.else' (Note: `.else'.).  If you have
several conditions to check, `.elseif' may be used to avoid nesting
blocks if/else within each subsequent `.else' block.

   The following variants of `.if' are also supported:
`.ifdef SYMBOL'
     Assembles the following section of code if the specified SYMBOL
     has been defined.

`.ifc STRING1,STRING2'
     Assembles the following section of code if the two strings are the
     same.  The strings may be optionally quoted with single quotes.
     If they are not quoted, the first string stops at the first comma,
     and the second string stops at the end of the line.  Strings which
     contain whitespace should be quoted.  The string comparison is
     case sensitive.

`.ifeq ABSOLUTE EXPRESSION'
     Assembles the following section of code if the argument is zero.

`.ifeqs STRING1,STRING2'
     Another form of `.ifc'.  The strings must be quoted using double
     quotes.

`.ifge ABSOLUTE EXPRESSION'
     Assembles the following section of code if the argument is greater
     than or equal to zero.

`.ifgt ABSOLUTE EXPRESSION'
     Assembles the following section of code if the argument is greater
     than zero.

`.ifle ABSOLUTE EXPRESSION'
     Assembles the following section of code if the argument is less
     than or equal to zero.

`.iflt ABSOLUTE EXPRESSION'
     Assembles the following section of code if the argument is less
     than zero.

`.ifnc STRING1,STRING2.'
     Like `.ifc', but the sense of the test is reversed: this assembles
     the following section of code if the two strings are not the same.

`.ifndef SYMBOL'
`.ifnotdef SYMBOL'
     Assembles the following section of code if the specified SYMBOL
     has not been defined.  Both spelling variants are equivalent.

`.ifne ABSOLUTE EXPRESSION'
     Assembles the following section of code if the argument is not
     equal to zero (in other words, this is equivalent to `.if').

`.ifnes STRING1,STRING2'
     Like `.ifeqs', but the sense of the test is reversed: this
     assembles the following section of code if the two strings are not
     the same.