165 lines
7.2 KiB
HTML
165 lines
7.2 KiB
HTML
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<title>Using as: D30V-Chars</title>
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="D30V_002dSyntax.html#D30V_002dSyntax" rel="up" title="D30V-Syntax">
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<link href="D30V_002dGuarded.html#D30V_002dGuarded" rel="next" title="D30V-Guarded">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="D30V_002dChars"></a>
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<div class="header">
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<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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</div>
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<hr>
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<a name="Special-Characters-8"></a>
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<h4 class="subsubsection">9.10.2.3 Special Characters</h4>
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<a name="index-line-comment-character_002c-D30V"></a>
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<a name="index-D30V-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-D30V"></a>
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<a name="index-D30V-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
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sequentially unless you use the ‘<samp>-O</samp>’ option.
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</p>
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<p>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>
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</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>
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</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 D30V 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 r2,r3 -> abs r4,r5</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>
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</dd>
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<dt><code>abs r2,r3 <- abs r4,r5</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>
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</dd>
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<dt><code>abs r2,r3 || abs r4,r5</code></dt>
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<dd><p>Execute these in parallel.
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</p>
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</dd>
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<dt><code>ldw r2,@(r3,r4) ||</code></dt>
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<dt><code>mulx r6,r8,r9</code></dt>
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<dd><p>Two-line format. Execute these in parallel.
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</p>
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</dd>
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<dt><code>mulx a0,r8,r9</code></dt>
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<dt><code>stw r2,@(r3,r4)</code></dt>
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<dd><p>Two-line format. Execute these sequentially unless ‘<samp>-O</samp>’ option is
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used. If the ‘<samp>-O</samp>’ option is used, the assembler will determine if
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the instructions could be done in parallel (the above two instructions
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can be done in parallel), and if so, emit them as parallel instructions.
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The assembler will put them in the proper containers. In the above
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example, the assembler will put the ‘<samp>stw</samp>’ instruction in left
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container and the ‘<samp>mulx</samp>’ instruction in the right container.
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</p>
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</dd>
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<dt><code>stw r2,@(r3,r4) -></code></dt>
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<dt><code>mulx a0,r8,r9</code></dt>
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<dd><p>Two-line format. Execute the ‘<samp>stw</samp>’ instruction followed by the
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‘<samp>mulx</samp>’ instruction sequentially. The first instruction goes in the
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left container and the second instruction goes into right container.
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The assembler will give an error if the machine ordering constraints are
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violated.
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</p>
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</dd>
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<dt><code>stw r2,@(r3,r4) <-</code></dt>
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<dt><code>mulx a0,r8,r9</code></dt>
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<dd><p>Same as previous example, except that the ‘<samp>mulx</samp>’ instruction is
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executed before the ‘<samp>stw</samp>’ instruction.
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</p></dd>
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</dl>
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<a name="index-symbol-names_002c-_0024-in-1"></a>
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<a name="index-_0024-in-symbol-names-1"></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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<hr>
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<div class="header">
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<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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</div>
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</body>
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