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114 lines
6.1 KiB
HTML
114 lines
6.1 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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<!-- Copyright (C) 1988-2018 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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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>Insn Attributes (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Insn Attributes (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Insn Attributes (GNU Compiler Collection (GCC) Internals)">
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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="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Machine-Desc.html#Machine-Desc" rel="up" title="Machine Desc">
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<link href="Defining-Attributes.html#Defining-Attributes" rel="next" title="Defining Attributes">
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<link href="define_005fpeephole2.html#define_005fpeephole2" rel="prev" title="define_peephole2">
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<style type="text/css">
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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="Insn-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="Conditional-Execution.html#Conditional-Execution" accesskey="n" rel="next">Conditional Execution</a>, Previous: <a href="Peephole-Definitions.html#Peephole-Definitions" accesskey="p" rel="prev">Peephole Definitions</a>, Up: <a href="Machine-Desc.html#Machine-Desc" accesskey="u" rel="up">Machine Desc</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Instruction-Attributes"></a>
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<h3 class="section">17.19 Instruction Attributes</h3>
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<a name="index-insn-attributes"></a>
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<a name="index-instruction-attributes"></a>
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<p>In addition to describing the instruction supported by the target machine,
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the <samp>md</samp> file also defines a group of <em>attributes</em> and a set of
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values for each. Every generated insn is assigned a value for each attribute.
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One possible attribute would be the effect that the insn has on the machine’s
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condition code. This attribute can then be used by <code>NOTICE_UPDATE_CC</code>
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to track the condition codes.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Defining-Attributes.html#Defining-Attributes" accesskey="1">Defining Attributes</a>:</td><td> </td><td align="left" valign="top">Specifying attributes and their values.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Expressions.html#Expressions" accesskey="2">Expressions</a>:</td><td> </td><td align="left" valign="top">Valid expressions for attribute values.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Tagging-Insns.html#Tagging-Insns" accesskey="3">Tagging Insns</a>:</td><td> </td><td align="left" valign="top">Assigning attribute values to insns.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Attr-Example.html#Attr-Example" accesskey="4">Attr Example</a>:</td><td> </td><td align="left" valign="top">An example of assigning attributes.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Insn-Lengths.html#Insn-Lengths" accesskey="5">Insn Lengths</a>:</td><td> </td><td align="left" valign="top">Computing the length of insns.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Constant-Attributes.html#Constant-Attributes" accesskey="6">Constant Attributes</a>:</td><td> </td><td align="left" valign="top">Defining attributes that are constant.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Mnemonic-Attribute.html#Mnemonic-Attribute" accesskey="7">Mnemonic Attribute</a>:</td><td> </td><td align="left" valign="top">Obtain the instruction mnemonic as attribute value.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Delay-Slots.html#Delay-Slots" accesskey="8">Delay Slots</a>:</td><td> </td><td align="left" valign="top">Defining delay slots required for a machine.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Processor-pipeline-description.html#Processor-pipeline-description" accesskey="9">Processor pipeline description</a>:</td><td> </td><td align="left" valign="top">Specifying information for insn scheduling.
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</td></tr>
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</table>
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</body>
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</html>
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