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A copy of the license is included in the 12section entitled "GNU Free Documentation License". 13 --> 14<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 15<head> 16<title>Using as: Infix Ops</title> 17 18<meta name="description" content="Using as: Infix Ops"> 19<meta name="keywords" content="Using as: Infix Ops"> 20<meta name="resource-type" content="document"> 21<meta name="distribution" content="global"> 22<meta name="Generator" content="makeinfo"> 23<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 24<link href="index.html#Top" rel="start" title="Top"> 25<link href="AS-Index.html#AS-Index" rel="index" title="AS Index"> 26<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 27<link href="Integer-Exprs.html#Integer-Exprs" rel="up" title="Integer Exprs"> 28<link href="Pseudo-Ops.html#Pseudo-Ops" rel="next" title="Pseudo Ops"> 29<link href="Prefix-Ops.html#Prefix-Ops" rel="previous" title="Prefix Ops"> 30<style type="text/css"> 31<!-- 32a.summary-letter {text-decoration: none} 33blockquote.smallquotation {font-size: smaller} 34div.display {margin-left: 3.2em} 35div.example {margin-left: 3.2em} 36div.indentedblock {margin-left: 3.2em} 37div.lisp {margin-left: 3.2em} 38div.smalldisplay {margin-left: 3.2em} 39div.smallexample {margin-left: 3.2em} 40div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 41div.smalllisp {margin-left: 3.2em} 42kbd {font-style:oblique} 43pre.display {font-family: inherit} 44pre.format {font-family: inherit} 45pre.menu-comment {font-family: serif} 46pre.menu-preformatted {font-family: serif} 47pre.smalldisplay {font-family: inherit; font-size: smaller} 48pre.smallexample {font-size: smaller} 49pre.smallformat {font-family: inherit; font-size: smaller} 50pre.smalllisp {font-size: smaller} 51span.nocodebreak {white-space:nowrap} 52span.nolinebreak {white-space:nowrap} 53span.roman {font-family:serif; font-weight:normal} 54span.sansserif {font-family:sans-serif; font-weight:normal} 55ul.no-bullet {list-style: none} 56--> 57</style> 58 59 60</head> 61 62<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 63<a name="Infix-Ops"></a> 64<div class="header"> 65<p> 66Previous: <a href="Prefix-Ops.html#Prefix-Ops" accesskey="p" rel="previous">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> 67</div> 68<hr> 69<a name="Infix-Operators"></a> 70<h4 class="subsection">6.2.4 Infix Operators</h4> 71 72<a name="index-infix-operators"></a> 73<a name="index-operators_002c-permitted-arguments"></a> 74<p><em>Infix operators</em> take two arguments, one on either side. Operators 75have precedence, but operations with equal precedence are performed left 76to right. Apart from <code>+</code> or <samp>-</samp>, both arguments must be 77absolute, and the result is absolute. 78</p> 79<ol> 80<li><a name="index-operator-precedence"></a> 81<a name="index-precedence-of-operators"></a> 82 83</li><li> Highest Precedence 84 85<dl compact="compact"> 86<dt><code>*</code></dt> 87<dd><p><em>Multiplication</em>. 88</p> 89</dd> 90<dt><code>/</code></dt> 91<dd><p><em>Division</em>. Truncation is the same as the C operator ‘<samp>/</samp>’ 92</p> 93</dd> 94<dt><code>%</code></dt> 95<dd><p><em>Remainder</em>. 96</p> 97</dd> 98<dt><code><<</code></dt> 99<dd><p><em>Shift Left</em>. Same as the C operator ‘<samp><<</samp>’. 100</p> 101</dd> 102<dt><code>>></code></dt> 103<dd><p><em>Shift Right</em>. Same as the C operator ‘<samp>>></samp>’. 104</p></dd> 105</dl> 106 107</li><li> Intermediate precedence 108 109<dl compact="compact"> 110<dt><code>|</code></dt> 111<dd> 112<p><em>Bitwise Inclusive Or</em>. 113</p> 114</dd> 115<dt><code>&</code></dt> 116<dd><p><em>Bitwise And</em>. 117</p> 118</dd> 119<dt><code>^</code></dt> 120<dd><p><em>Bitwise Exclusive Or</em>. 121</p> 122</dd> 123<dt><code>!</code></dt> 124<dd><p><em>Bitwise Or Not</em>. 125</p></dd> 126</dl> 127 128</li><li> Low Precedence 129 130<dl compact="compact"> 131<dd><a name="index-addition_002c-permitted-arguments"></a> 132<a name="index-plus_002c-permitted-arguments"></a> 133<a name="index-arguments-for-addition"></a> 134</dd> 135<dt><code>+</code></dt> 136<dd><p><em>Addition</em>. If either argument is absolute, the result has the section of 137the other argument. You may not add together arguments from different 138sections. 139</p> 140<a name="index-subtraction_002c-permitted-arguments"></a> 141<a name="index-minus_002c-permitted-arguments"></a> 142<a name="index-arguments-for-subtraction"></a> 143</dd> 144<dt><code>-</code></dt> 145<dd><p><em>Subtraction</em>. If the right argument is absolute, the 146result has the section of the left argument. 147If both arguments are in the same section, the result is absolute. 148You may not subtract arguments from different sections. 149</p> 150<a name="index-comparison-expressions"></a> 151<a name="index-expressions_002c-comparison"></a> 152</dd> 153<dt><code>==</code></dt> 154<dd><p><em>Is Equal To</em> 155</p></dd> 156<dt><code><></code></dt> 157<dt><code>!=</code></dt> 158<dd><p><em>Is Not Equal To</em> 159</p></dd> 160<dt><code><</code></dt> 161<dd><p><em>Is Less Than</em> 162</p></dd> 163<dt><code>></code></dt> 164<dd><p><em>Is Greater Than</em> 165</p></dd> 166<dt><code>>=</code></dt> 167<dd><p><em>Is Greater Than Or Equal To</em> 168</p></dd> 169<dt><code><=</code></dt> 170<dd><p><em>Is Less Than Or Equal To</em> 171</p> 172<p>The comparison operators can be used as infix operators. A true results has a 173value of -1 whereas a false result has a value of 0. Note, these operators 174perform signed comparisons. 175</p></dd> 176</dl> 177 178</li><li> Lowest Precedence 179 180<dl compact="compact"> 181<dt><code>&&</code></dt> 182<dd><p><em>Logical And</em>. 183</p> 184</dd> 185<dt><code>||</code></dt> 186<dd><p><em>Logical Or</em>. 187</p> 188<p>These two logical operations can be used to combine the results of sub 189expressions. Note, unlike the comparison operators a true result returns a 190value of 1 but a false results does still return 0. Also note that the logical 191or operator has a slightly lower precedence than logical and. 192</p> 193</dd> 194</dl> 195</li></ol> 196 197<p>In short, it’s only meaningful to add or subtract the <em>offsets</em> in an 198address; you can only have a defined section in one of the two arguments. 199</p> 200<hr> 201<div class="header"> 202<p> 203Previous: <a href="Prefix-Ops.html#Prefix-Ops" accesskey="p" rel="previous">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> 204</div> 205 206 207 208</body> 209</html> 210