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| <h5 class="subsubsection">9.11.2.3 Special Characters</h5> |
| |
| <p><a name="index-line-comment-character_002c-D10V-987"></a><a name="index-D10V-line-comment-character-988"></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-989"></a><a name="index-D10V-sub_002dinstruction-ordering-990"></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-991"></a><a name="index-g_t_0040code_007b_0024_007d-in-symbol-names-992"></a>Since ‘<samp><span class="samp">$</span></samp>’ has no special meaning, you may use it in symbol names. |
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