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