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<h5 class="subsubsection">9.9.2.3 Special Characters</h5>
<p><a name="index-line-comment-character_002c-D10V-887"></a><a name="index-D10V-line-comment-character-888"></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-889"></a><a name="index-D10V-sub_002dinstruction-ordering-890"></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">-></span></samp>’<dd>Sequential with instruction on the left first.
<br><dt>‘<samp><span class="samp"><-</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 -> 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 <- 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+ -></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-891"></a><a name="index-g_t_0040code_007b_0024_007d-in-symbol-names-892"></a>Since ‘<samp><span class="samp">$</span></samp>’ has no special meaning, you may use it in symbol names.
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