has been defined. Note a symbol which has been referenced but not yet defined
is considered to be undefined.
+@cindex @code{ifb} directive
+@item .ifb @var{text}
+Assembles the following section of code if the operand is blank (empty).
+
@cindex @code{ifc} directive
@item .ifc @var{string1},@var{string2}
Assembles the following section of code if the two strings are the same. The
@item .iflt @var{absolute expression}
Assembles the following section of code if the argument is less than zero.
+@cindex @code{ifnb} directive
+@item .ifnb @var{text}
+Like @code{.ifb}, but the sense of the test is reversed: this assembles the
+following section of code if the operand is non-blank (non-empty).
+
@cindex @code{ifnc} directive
@item .ifnc @var{string1},@var{string2}.
Like @code{.ifc}, but the sense of the test is reversed: this assembles the