.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).
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.
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