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126 lines
4.9 KiB
HTML
126 lines
4.9 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>ARC-Chars (Using as)</title>
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<meta name="description" content="ARC-Chars (Using as)">
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<meta name="keywords" content="ARC-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="ARC-Syntax.html#ARC-Syntax" rel="up" title="ARC Syntax">
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<link href="ARC_002dRegs.html#ARC_002dRegs" rel="next" title="ARC-Regs">
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<link href="ARC-Syntax.html#ARC-Syntax" rel="prev" title="ARC Syntax">
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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="ARC_002dChars"></a>
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<div class="header">
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<p>
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Next: <a href="ARC_002dRegs.html#ARC_002dRegs" accesskey="n" rel="next">ARC-Regs</a>, Up: <a href="ARC-Syntax.html#ARC-Syntax" accesskey="u" rel="up">ARC 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-2"></a>
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<h4 class="subsubsection">9.3.2.1 Special Characters</h4>
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<dl compact="compact">
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<dt><code>%</code></dt>
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<dd><a name="index-register-name-prefix-character_002c-ARC"></a>
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<a name="index-ARC-register-name-prefix-character"></a>
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<p>A register name can optionally be prefixed by a ‘<samp>%</samp>’ character. So
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register <code>%r0</code> is equivalent to <code>r0</code> in the assembly code.
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</p>
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</dd>
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<dt><code>#</code></dt>
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<dd><a name="index-line-comment-character_002c-ARC"></a>
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<a name="index-ARC-line-comment-character"></a>
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<p>The presence of a ‘<samp>#</samp>’ character within a line (but not at the
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start of a line) indicates the start of a comment that extends to the
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end of the current line.
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</p>
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<p><em>Note:</em> if a line starts with a ‘<samp>#</samp>’ character then it can
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also be a logical line number directive (see <a href="Comments.html#Comments">Comments</a>) or a
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preprocessor control command (see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).
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</p>
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</dd>
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<dt><code>@</code></dt>
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<dd><a name="index-symbol-prefix-character_002c-ARC"></a>
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<a name="index-ARC-symbol-prefix-character"></a>
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<p>Prefixing an operand with an ‘<samp>@</samp>’ specifies that the operand is a
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symbol and not a register. This is how the assembler disambiguates
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the use of an ARC register name as a symbol. So the instruction
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</p><div class="example">
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<pre class="example">mov r0, @r0
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</pre></div>
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<p>moves the address of symbol <code>r0</code> into register <code>r0</code>.
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</p>
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</dd>
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<dt><code>`</code></dt>
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<dd><a name="index-line-separator_002c-ARC"></a>
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<a name="index-statement-separator_002c-ARC"></a>
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<a name="index-ARC-line-separator"></a>
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<p>The ‘<samp>`</samp>’ (backtick) character is used to separate statements on a
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single line.
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</p>
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<a name="index-line"></a>
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</dd>
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<dt><code>-</code></dt>
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<dd><a name="index-C-preprocessor-macro-separator_002c-ARC"></a>
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<a name="index-ARC-C-preprocessor-macro-separator"></a>
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<p>Used as a separator to obtain a sequence of commands from a C
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preprocessor macro.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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