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85 lines
4.7 KiB
HTML
85 lines
4.7 KiB
HTML
4 years ago
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<title>D10V-Chars - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="D10V_002dSyntax.html#D10V_002dSyntax" title="D10V-Syntax">
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<link rel="prev" href="D10V_002dSubs.html#D10V_002dSubs" title="D10V-Subs">
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<link rel="next" href="D10V_002dRegs.html#D10V_002dRegs" title="D10V-Regs">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="D10V-Chars"></a>
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<a name="D10V_002dChars"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="D10V_002dRegs.html#D10V_002dRegs">D10V-Regs</a>,
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Previous: <a rel="previous" accesskey="p" href="D10V_002dSubs.html#D10V_002dSubs">D10V-Subs</a>,
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Up: <a rel="up" accesskey="u" href="D10V_002dSyntax.html#D10V_002dSyntax">D10V-Syntax</a>
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<hr>
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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-D10V-887"></a><a name="index-D10V-line-comment-character-888"></a>A semicolon (‘<samp><span class="samp">;</span></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>If a ‘<samp><span class="samp">#</span></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><a name="index-sub_002dinstruction-ordering_002c-D10V-889"></a><a name="index-D10V-sub_002dinstruction-ordering-890"></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 sequentially.
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To specify the executing order, use the following symbols:
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<dl>
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<dt>‘<samp><span class="samp">-></span></samp>’<dd>Sequential with instruction on the left first.
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<br><dt>‘<samp><span class="samp"><-</span></samp>’<dd>Sequential with instruction on the right first.
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<br><dt>‘<samp><span class="samp">||</span></samp>’<dd>Parallel
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</dl>
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The D10V 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 a1 -> abs r0</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 r0 <- abs a1</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>ld2w r2,@r8+ || mac a0,r0,r7</code><dd>Execute these in parallel.
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<br><dt><code>ld2w r2,@r8+ ||</code><dt><code>mac a0,r0,r7</code><dd>Two-line format. Execute these in parallel.
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<br><dt><code>ld2w r2,@r8+</code><dt><code>mac a0,r0,r7</code><dd>Two-line format. Execute these sequentially. Assembler will
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put them in the proper containers.
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<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
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second instruction will always go into right container.
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</dl>
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<a name="index-symbol-names_002c-_0040samp_007b_0024_007d-in-891"></a><a name="index-g_t_0040code_007b_0024_007d-in-symbol-names-892"></a>Since ‘<samp><span class="samp">$</span></samp>’ has no special meaning, you may use it in symbol names.
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</body></html>
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