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97 lines
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<title>D30V-Chars - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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<p>
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<a name="D30V_002dChars"></a>Next: <a rel="next" accesskey="n" href="D30V_002dGuarded.html#D30V_002dGuarded">D30V-Guarded</a>,
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Previous: <a rel="previous" accesskey="p" href="D30V_002dSubs.html#D30V_002dSubs">D30V-Subs</a>,
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Up: <a rel="up" accesskey="u" href="D30V_002dSyntax.html#D30V_002dSyntax">D30V-Syntax</a>
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</div>
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<h5 class="subsubsection">9.9.2.3 Special Characters</h5>
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<p><a name="index-line-comment-character_002c-D30V-758"></a><a name="index-D30V-line-comment-character-759"></a><span class="samp">;</span> and <span class="samp">#</span> are the line comment characters.
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<a name="index-sub_002dinstruction-ordering_002c-D30V-760"></a><a name="index-D30V-sub_002dinstruction-ordering-761"></a>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 <span class="samp">-O</span> option.
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<p>To specify the executing order, use the following symbols:
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<dl>
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<dt><span class="samp">-></span><dd>Sequential with instruction on the left first.
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<br><dt><span class="samp"><-</span><dd>Sequential with instruction on the right first.
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<br><dt><span class="samp">||</span><dd>Parallel
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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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<dl>
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<dt><code>abs r2,r3 -> abs r4,r5</code><dd>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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<br><dt><code>abs r2,r3 <- abs r4,r5</code><dd>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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<br><dt><code>abs r2,r3 || abs r4,r5</code><dd>Execute these in parallel.
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<br><dt><code>ldw r2,@(r3,r4) ||</code><dt><code>mulx r6,r8,r9</code><dd>Two-line format. Execute these in parallel.
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<br><dt><code>mulx a0,r8,r9</code><dt><code>stw r2,@(r3,r4)</code><dd>Two-line format. Execute these sequentially unless <span class="samp">-O</span> option is
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used. If the <span class="samp">-O</span> 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 <span class="samp">stw</span> instruction in left
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container and the <span class="samp">mulx</span> instruction in the right container.
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<br><dt><code>stw r2,@(r3,r4) -></code><dt><code>mulx a0,r8,r9</code><dd>Two-line format. Execute the <span class="samp">stw</span> instruction followed by the
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<span class="samp">mulx</span> 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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<br><dt><code>stw r2,@(r3,r4) <-</code><dt><code>mulx a0,r8,r9</code><dd>Same as previous example, except that the <span class="samp">mulx</span> instruction is
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executed before the <span class="samp">stw</span> instruction.
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</dl>
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<p><a name="index-symbol-names_002c-_0040samp_007b_0024_007d-in-762"></a><a name="index-_0040code_007b_0024_007d-in-symbol-names-763"></a>Since <span class="samp">$</span> has no special meaning, you may use it in symbol names.
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