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<h5 class="subsubsection">9.9.2.3 Special Characters</h5>

<p><a name="index-line-comment-character_002c-D10V-905"></a><a name="index-D10V-line-comment-character-906"></a>A semicolon (`<samp><span class="samp">;</span></samp>') can be used anywhere on a line to start a
comment that extends to the end of the line.

   <p>If a `<samp><span class="samp">#</span></samp>' 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-907"></a><a name="index-D10V-sub_002dinstruction-ordering-908"></a>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:
     <dl>
<dt>`<samp><span class="samp">-&gt;</span></samp>'<dd>Sequential with instruction on the left first. 
<br><dt>`<samp><span class="samp">&lt;-</span></samp>'<dd>Sequential with instruction on the right first. 
<br><dt>`<samp><span class="samp">||</span></samp>'<dd>Parallel
</dl>
   The D10V syntax allows either one instruction per line, one instruction per line with
the execution symbol, or two instructions per line.  For example
     <dl>
<dt><code>abs       a1      -&gt;      abs     r0</code><dd>Execute these sequentially.  The instruction on the right is in the right
container and is executed second. 
<br><dt><code>abs       r0      &lt;-      abs     a1</code><dd>Execute these reverse-sequentially.  The instruction on the right is in the right
container, and is executed first. 
<br><dt><code>ld2w    r2,@r8+         ||      mac     a0,r0,r7</code><dd>Execute these in parallel. 
<br><dt><code>ld2w    r2,@r8+         ||</code><dt><code>mac     a0,r0,r7</code><dd>Two-line format. Execute these in parallel. 
<br><dt><code>ld2w    r2,@r8+</code><dt><code>mac     a0,r0,r7</code><dd>Two-line format. Execute these sequentially.  Assembler will
put them in the proper containers. 
<br><dt><code>ld2w    r2,@r8+         -&gt;</code><dt><code>mac     a0,r0,r7</code><dd>Two-line format. Execute these sequentially.  Same as above but
second instruction will always go into right container. 
</dl>
   <a name="index-symbol-names_002c-_0040samp_007b_0024_007d-in-909"></a><a name="index-g_t_0040code_007b_0024_007d-in-symbol-names-910"></a>Since `<samp><span class="samp">$</span></samp>' has no special meaning, you may use it in symbol names.

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