+@node ARM-Instruction-Set
+@subsection Instruction Set Syntax
+Two slightly different syntaxes are support for ARM and THUMB
+instructions. The default, @code{divided}, uses the old style where
+ARM and THUMB instructions had their own, separate syntaxes. The new,
+@code{unified} syntax, which can be selected via the @code{.syntax}
+directive, and has the following main features:
+
+@table @bullet
+@item
+Immediate operands do not require a @code{#} prefix.
+
+@item
+The @code{IT} instruction may appear, and if it does it is validated
+against subsequent conditional affixes. In ARM mode it does not
+generate machine code, in THUMB mode it does.
+
+@item
+For ARM instructions the conditional affixes always appear at the end
+of the instruction. For THUMB instructions conditional affixes can be
+used, but only inside the scope of an @code{IT} instruction.
+
+@item
+All of the instructions new to the V6T2 architecture (and later) are
+available. (Only a few such instructions can be written in the
+@code{divided} syntax).
+
+@item
+The @code{.N} and @code{.W} suffixes are recognized and honored.
+
+@item
+All instructions set the flags if and only if they have an @code{s}
+affix.
+@end table
+