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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> |
| <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 (‘<samp>;</samp>’) can be used anywhere on a line to start a |
| comment that extends to the end of the line. |
| </p> |
| <p>If a ‘<samp>#</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"></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>‘<samp>-></samp>’</dt> |
| <dd><p>Sequential with instruction on the left first. |
| </p></dd> |
| <dt>‘<samp><-</samp>’</dt> |
| <dd><p>Sequential with instruction on the right first. |
| </p></dd> |
| <dt>‘<samp>||</samp>’</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 -> 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 <- 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+ -></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 ‘<samp>$</samp>’ has no special meaning, you may use it in symbol names. |
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