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<a name="D10V_002dChars"></a>
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<p>
Next: <a href="D10V_002dRegs.html#D10V_002dRegs" accesskey="n" rel="next">D10V-Regs</a>, Previous: <a href="D10V_002dSubs.html#D10V_002dSubs" accesskey="p" rel="prev">D10V-Subs</a>, Up: <a href="D10V_002dSyntax.html#D10V_002dSyntax" accesskey="u" rel="up">D10V-Syntax</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Special-Characters-7"></a>
<h4 class="subsubsection">9.9.2.3 Special Characters</h4>
<a name="index-line-comment-character_002c-D10V"></a>
<a name="index-D10V-line-comment-character"></a>
<p>A semicolon (&lsquo;<samp>;</samp>&rsquo;) can be used anywhere on a line to start a
comment that extends to the end of the line.
</p>
<p>If a &lsquo;<samp>#</samp>&rsquo; appears as the first character of a line, the whole line
is treated as a comment, but in this case the line could also be a
logical line number directive (see <a href="Comments.html#Comments">Comments</a>) or a preprocessor
control command (see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).
</p>
<a name="index-sub_002dinstruction-ordering_002c-D10V"></a>
<a name="index-D10V-sub_002dinstruction-ordering"></a>
<p>Sub-instructions may be executed in order, in reverse-order, or in parallel.
Instructions listed in the standard one-per-line format will be executed sequentially.
To specify the executing order, use the following symbols:
</p><dl compact="compact">
<dt>&lsquo;<samp>-&gt;</samp>&rsquo;</dt>
<dd><p>Sequential with instruction on the left first.
</p></dd>
<dt>&lsquo;<samp>&lt;-</samp>&rsquo;</dt>
<dd><p>Sequential with instruction on the right first.
</p></dd>
<dt>&lsquo;<samp>||</samp>&rsquo;</dt>
<dd><p>Parallel
</p></dd>
</dl>
<p>The D10V syntax allows either one instruction per line, one instruction per line with
the execution symbol, or two instructions per line.  For example
</p><dl compact="compact">
<dt><code>abs       a1      -&gt;      abs     r0</code></dt>
<dd><p>Execute these sequentially.  The instruction on the right is in the right
container and is executed second.
</p></dd>
<dt><code>abs       r0      &lt;-      abs     a1</code></dt>
<dd><p>Execute these reverse-sequentially.  The instruction on the right is in the right
container, and is executed first.
</p></dd>
<dt><code>ld2w    r2,@r8+         ||      mac     a0,r0,r7</code></dt>
<dd><p>Execute these in parallel.
</p></dd>
<dt><code>ld2w    r2,@r8+         ||</code></dt>
<dt><code>mac     a0,r0,r7</code></dt>
<dd><p>Two-line format. Execute these in parallel.
</p></dd>
<dt><code>ld2w    r2,@r8+</code></dt>
<dt><code>mac     a0,r0,r7</code></dt>
<dd><p>Two-line format. Execute these sequentially.  Assembler will
put them in the proper containers.
</p></dd>
<dt><code>ld2w    r2,@r8+         -&gt;</code></dt>
<dt><code>mac     a0,r0,r7</code></dt>
<dd><p>Two-line format. Execute these sequentially.  Same as above but
second instruction will always go into right container.
</p></dd>
</dl>
<a name="index-symbol-names_002c-_0024-in"></a>
<a name="index-_0024-in-symbol-names"></a>
<p>Since &lsquo;<samp>$</samp>&rsquo; has no special meaning, you may use it in symbol names.
</p>
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