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| Next: <a href="D30V_002dGuarded.html#D30V_002dGuarded" accesskey="n" rel="next">D30V-Guarded</a>, Previous: <a href="D30V_002dSubs.html#D30V_002dSubs" accesskey="p" rel="prev">D30V-Subs</a>, Up: <a href="D30V_002dSyntax.html#D30V_002dSyntax" accesskey="u" rel="up">D30V-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-8"></a> |
| <h4 class="subsubsection">9.10.2.3 Special Characters</h4> |
| <a name="index-line-comment-character_002c-D30V"></a> |
| <a name="index-D30V-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-D30V"></a> |
| <a name="index-D30V-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 unless you use the ‘<samp>-O</samp>’ option. |
| </p> |
| <p>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 D30V 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 r2,r3 -> abs r4,r5</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 r2,r3 <- abs r4,r5</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>abs r2,r3 || abs r4,r5</code></dt> |
| <dd><p>Execute these in parallel. |
| </p> |
| </dd> |
| <dt><code>ldw r2,@(r3,r4) ||</code></dt> |
| <dt><code>mulx r6,r8,r9</code></dt> |
| <dd><p>Two-line format. Execute these in parallel. |
| </p> |
| </dd> |
| <dt><code>mulx a0,r8,r9</code></dt> |
| <dt><code>stw r2,@(r3,r4)</code></dt> |
| <dd><p>Two-line format. Execute these sequentially unless ‘<samp>-O</samp>’ option is |
| used. If the ‘<samp>-O</samp>’ option is used, the assembler will determine if |
| the instructions could be done in parallel (the above two instructions |
| can be done in parallel), and if so, emit them as parallel instructions. |
| The assembler will put them in the proper containers. In the above |
| example, the assembler will put the ‘<samp>stw</samp>’ instruction in left |
| container and the ‘<samp>mulx</samp>’ instruction in the right container. |
| </p> |
| </dd> |
| <dt><code>stw r2,@(r3,r4) -></code></dt> |
| <dt><code>mulx a0,r8,r9</code></dt> |
| <dd><p>Two-line format. Execute the ‘<samp>stw</samp>’ instruction followed by the |
| ‘<samp>mulx</samp>’ instruction sequentially. The first instruction goes in the |
| left container and the second instruction goes into right container. |
| The assembler will give an error if the machine ordering constraints are |
| violated. |
| </p> |
| </dd> |
| <dt><code>stw r2,@(r3,r4) <-</code></dt> |
| <dt><code>mulx a0,r8,r9</code></dt> |
| <dd><p>Same as previous example, except that the ‘<samp>mulx</samp>’ instruction is |
| executed before the ‘<samp>stw</samp>’ instruction. |
| </p></dd> |
| </dl> |
| |
| <a name="index-symbol-names_002c-_0024-in-1"></a> |
| <a name="index-_0024-in-symbol-names-1"></a> |
| <p>Since ‘<samp>$</samp>’ has no special meaning, you may use it in symbol names. |
| </p> |
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| Next: <a href="D30V_002dGuarded.html#D30V_002dGuarded" accesskey="n" rel="next">D30V-Guarded</a>, Previous: <a href="D30V_002dSubs.html#D30V_002dSubs" accesskey="p" rel="prev">D30V-Subs</a>, Up: <a href="D30V_002dSyntax.html#D30V_002dSyntax" accesskey="u" rel="up">D30V-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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