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164 lines
7.1 KiB
HTML
164 lines
7.1 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>D30V-Chars (Using as)</title>
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<meta name="description" content="D30V-Chars (Using as)">
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<meta name="keywords" content="D30V-Chars (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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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<link href="D30V_002dSubs.html#D30V_002dSubs" rel="prev" title="D30V-Subs">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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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">9.11.2.3 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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</html>
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