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209 lines
6.9 KiB
HTML
209 lines
6.9 KiB
HTML
<!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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Infix Ops (Using as)</title>
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<meta name="description" content="Infix Ops (Using as)">
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<meta name="keywords" content="Infix Ops (Using as)">
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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="Integer-Exprs.html#Integer-Exprs" rel="up" title="Integer Exprs">
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<link href="Pseudo-Ops.html#Pseudo-Ops" rel="next" title="Pseudo Ops">
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<link href="Prefix-Ops.html#Prefix-Ops" rel="prev" title="Prefix Ops">
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<style type="text/css">
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</style>
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</head>
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<body lang="en">
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<a name="Infix-Ops"></a>
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<div class="header">
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<p>
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Previous: <a href="Prefix-Ops.html#Prefix-Ops" accesskey="p" rel="prev">Prefix Ops</a>, Up: <a href="Integer-Exprs.html#Integer-Exprs" accesskey="u" rel="up">Integer Exprs</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="Infix-Operators"></a>
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<h4 class="subsection">6.2.4 Infix Operators</h4>
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<a name="index-infix-operators"></a>
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<a name="index-operators_002c-permitted-arguments"></a>
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<p><em>Infix operators</em> take two arguments, one on either side. Operators
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have precedence, but operations with equal precedence are performed left
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to right. Apart from <code>+</code> or <samp>-</samp>, both arguments must be
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absolute, and the result is absolute.
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</p>
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<ol>
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<li><a name="index-operator-precedence"></a>
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<a name="index-precedence-of-operators"></a>
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</li><li> Highest Precedence
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<dl compact="compact">
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<dt><code>*</code></dt>
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<dd><p><em>Multiplication</em>.
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</p>
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</dd>
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<dt><code>/</code></dt>
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<dd><p><em>Division</em>. Truncation is the same as the C operator ‘<samp>/</samp>’
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</p>
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</dd>
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<dt><code>%</code></dt>
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<dd><p><em>Remainder</em>.
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</p>
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</dd>
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<dt><code><<</code></dt>
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<dd><p><em>Shift Left</em>. Same as the C operator ‘<samp><<</samp>’.
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</p>
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</dd>
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<dt><code>>></code></dt>
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<dd><p><em>Shift Right</em>. Same as the C operator ‘<samp>>></samp>’.
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</p></dd>
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</dl>
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</li><li> Intermediate precedence
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<dl compact="compact">
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<dt><code>|</code></dt>
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<dd>
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<p><em>Bitwise Inclusive Or</em>.
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</p>
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</dd>
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<dt><code>&</code></dt>
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<dd><p><em>Bitwise And</em>.
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</p>
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</dd>
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<dt><code>^</code></dt>
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<dd><p><em>Bitwise Exclusive Or</em>.
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</p>
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</dd>
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<dt><code>!</code></dt>
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<dd><p><em>Bitwise Or Not</em>.
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</p></dd>
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</dl>
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</li><li> Low Precedence
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<dl compact="compact">
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<dd><a name="index-addition_002c-permitted-arguments"></a>
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<a name="index-plus_002c-permitted-arguments"></a>
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<a name="index-arguments-for-addition"></a>
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</dd>
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<dt><code>+</code></dt>
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<dd><p><em>Addition</em>. If either argument is absolute, the result has the section of
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the other argument. You may not add together arguments from different
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sections.
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</p>
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<a name="index-subtraction_002c-permitted-arguments"></a>
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<a name="index-minus_002c-permitted-arguments"></a>
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<a name="index-arguments-for-subtraction"></a>
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</dd>
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<dt><code>-</code></dt>
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<dd><p><em>Subtraction</em>. If the right argument is absolute, the
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result has the section of the left argument.
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If both arguments are in the same section, the result is absolute.
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You may not subtract arguments from different sections.
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</p>
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<a name="index-comparison-expressions"></a>
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<a name="index-expressions_002c-comparison"></a>
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</dd>
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<dt><code>==</code></dt>
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<dd><p><em>Is Equal To</em>
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</p></dd>
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<dt><code><></code></dt>
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<dt><code>!=</code></dt>
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<dd><p><em>Is Not Equal To</em>
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</p></dd>
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<dt><code><</code></dt>
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<dd><p><em>Is Less Than</em>
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</p></dd>
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<dt><code>></code></dt>
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<dd><p><em>Is Greater Than</em>
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</p></dd>
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<dt><code>>=</code></dt>
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<dd><p><em>Is Greater Than Or Equal To</em>
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</p></dd>
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<dt><code><=</code></dt>
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<dd><p><em>Is Less Than Or Equal To</em>
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</p>
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<p>The comparison operators can be used as infix operators. A true results has a
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value of -1 whereas a false result has a value of 0. Note, these operators
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perform signed comparisons.
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</p></dd>
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</dl>
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</li><li> Lowest Precedence
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<dl compact="compact">
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<dt><code>&&</code></dt>
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<dd><p><em>Logical And</em>.
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</p>
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</dd>
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<dt><code>||</code></dt>
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<dd><p><em>Logical Or</em>.
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</p>
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<p>These two logical operations can be used to combine the results of sub
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expressions. Note, unlike the comparison operators a true result returns a
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value of 1 but a false results does still return 0. Also note that the logical
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or operator has a slightly lower precedence than logical and.
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</p>
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</dd>
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</dl>
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</li></ol>
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<p>In short, it’s only meaningful to add or subtract the <em>offsets</em> in an
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address; you can only have a defined section in one of the two arguments.
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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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Previous: <a href="Prefix-Ops.html#Prefix-Ops" accesskey="p" rel="prev">Prefix Ops</a>, Up: <a href="Integer-Exprs.html#Integer-Exprs" accesskey="u" rel="up">Integer Exprs</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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