<html lang="en">
<head>
<title>Infix Ops - Using as</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Using as">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="Integer-Exprs.html#Integer-Exprs" title="Integer Exprs">
<link rel="prev" href="Prefix-Ops.html#Prefix-Ops" title="Prefix Ops">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This file documents the GNU Assembler "as".
Copyright (C) 1991-2015 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts. A copy of the license is included in the
section entitled ``GNU Free Documentation License''.
-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family:serif; font-weight:normal; }
span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
</head>
<body>
<div class="node">
<a name="Infix-Ops"></a>
<p>
Previous: <a rel="previous" accesskey="p" href="Prefix-Ops.html#Prefix-Ops">Prefix Ops</a>,
Up: <a rel="up" accesskey="u" href="Integer-Exprs.html#Integer-Exprs">Integer Exprs</a>
<hr>
</div>
<h4 class="subsection">6.2.4 Infix Operators</h4>
<p><a name="index-infix-operators-257"></a><a name="index-operators_002c-permitted-arguments-258"></a><dfn>Infix operators</dfn> take two arguments, one on either side. Operators
have precedence, but operations with equal precedence are performed left
to right. Apart from <code>+</code> or <samp><span class="option">-</span></samp>, both arguments must be
absolute, and the result is absolute.
<ol type=1 start=1>
<a name="index-operator-precedence-259"></a><a name="index-precedence-of-operators-260"></a>
<li>Highest Precedence
<dl>
<dt><code>*</code><dd><dfn>Multiplication</dfn>.
<br><dt><code>/</code><dd><dfn>Division</dfn>. Truncation is the same as the C operator ‘<samp><span class="samp">/</span></samp>’
<br><dt><code>%</code><dd><dfn>Remainder</dfn>.
<br><dt><code><<</code><dd><dfn>Shift Left</dfn>. Same as the C operator ‘<samp><span class="samp"><<</span></samp>’.
<br><dt><code>>></code><dd><dfn>Shift Right</dfn>. Same as the C operator ‘<samp><span class="samp">>></span></samp>’.
</dl>
<li>Intermediate precedence
<dl>
<dt><code>|</code><dd>
<dfn>Bitwise Inclusive Or</dfn>.
<br><dt><code>&</code><dd><dfn>Bitwise And</dfn>.
<br><dt><code>^</code><dd><dfn>Bitwise Exclusive Or</dfn>.
<br><dt><code>!</code><dd><dfn>Bitwise Or Not</dfn>.
</dl>
<li>Low Precedence
<a name="index-addition_002c-permitted-arguments-261"></a>
<a name="index-plus_002c-permitted-arguments-262"></a>
<a name="index-arguments-for-addition-263"></a>
<dl><dt><code>+</code><dd><dfn>Addition</dfn>. If either argument is absolute, the result has the section of
the other argument. You may not add together arguments from different
sections.
<p><a name="index-subtraction_002c-permitted-arguments-264"></a><a name="index-minus_002c-permitted-arguments-265"></a><a name="index-arguments-for-subtraction-266"></a><br><dt><code>-</code><dd><dfn>Subtraction</dfn>. If the right argument is absolute, the
result has the section of the left argument.
If both arguments are in the same section, the result is absolute.
You may not subtract arguments from different sections.
<!-- FIXME is there still something useful to say about undefined - undefined ? -->
<p><a name="index-comparison-expressions-267"></a><a name="index-expressions_002c-comparison-268"></a><br><dt><code>==</code><dd><dfn>Is Equal To</dfn>
<br><dt><code><></code><dt><code>!=</code><dd><dfn>Is Not Equal To</dfn>
<br><dt><code><</code><dd><dfn>Is Less Than</dfn>
<br><dt><code>></code><dd><dfn>Is Greater Than</dfn>
<br><dt><code>>=</code><dd><dfn>Is Greater Than Or Equal To</dfn>
<br><dt><code><=</code><dd><dfn>Is Less Than Or Equal To</dfn>
<p>The comparison operators can be used as infix operators. A true results has a
value of -1 whereas a false result has a value of 0. Note, these operators
perform signed comparisons.
</dl>
<li>Lowest Precedence
<dl>
<dt><code>&&</code><dd><dfn>Logical And</dfn>.
<br><dt><code>||</code><dd><dfn>Logical Or</dfn>.
<p>These two logical operations can be used to combine the results of sub
expressions. Note, unlike the comparison operators a true result returns a
value of 1 but a false results does still return 0. Also note that the logical
or operator has a slightly lower precedence than logical and.
</dl>
</ol>
<p>In short, it's only meaningful to add or subtract the <em>offsets</em> in an
address; you can only have a defined section in one of the two arguments.
</body></html>