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diff --git a/share/doc/gccint/Machine-Desc.html b/share/doc/gccint/Machine-Desc.html new file mode 100644 index 0000000..54c290b --- /dev/null +++ b/share/doc/gccint/Machine-Desc.html @@ -0,0 +1,157 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>GNU Compiler Collection (GCC) Internals: Machine Desc</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Machine Desc"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Machine Desc"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="index.html#Top" rel="up" title="Top"> +<link href="Overview.html#Overview" rel="next" title="Overview"> +<link href="Dependency-analysis.html#Dependency-analysis" rel="previous" title="Dependency analysis"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Machine-Desc"></a> +<div class="header"> +<p> +Next: <a href="Target-Macros.html#Target-Macros" accesskey="n" rel="next">Target Macros</a>, Previous: <a href="Loop-Analysis-and-Representation.html#Loop-Analysis-and-Representation" accesskey="p" rel="previous">Loop Analysis and Representation</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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> +</div> +<hr> +<a name="Machine-Descriptions"></a> +<h2 class="chapter">17 Machine Descriptions</h2> +<a name="index-machine-descriptions"></a> + +<p>A machine description has two parts: a file of instruction patterns +(<samp>.md</samp> file) and a C header file of macro definitions. +</p> +<p>The <samp>.md</samp> file for a target machine contains a pattern for each +instruction that the target machine supports (or at least each instruction +that is worth telling the compiler about). It may also contain comments. +A semicolon causes the rest of the line to be a comment, unless the semicolon +is inside a quoted string. +</p> +<p>See the next chapter for information on the C header file. +</p> +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Overview.html#Overview" accesskey="1">Overview</a>:</td><td> </td><td align="left" valign="top">How the machine description is used. +</td></tr> +<tr><td align="left" valign="top">• <a href="Patterns.html#Patterns" accesskey="2">Patterns</a>:</td><td> </td><td align="left" valign="top">How to write instruction patterns. +</td></tr> +<tr><td align="left" valign="top">• <a href="Example.html#Example" accesskey="3">Example</a>:</td><td> </td><td align="left" valign="top">An explained example of a <code>define_insn</code> pattern. +</td></tr> +<tr><td align="left" valign="top">• <a href="RTL-Template.html#RTL-Template" accesskey="4">RTL Template</a>:</td><td> </td><td align="left" valign="top">The RTL template defines what insns match a pattern. +</td></tr> +<tr><td align="left" valign="top">• <a href="Output-Template.html#Output-Template" accesskey="5">Output Template</a>:</td><td> </td><td align="left" valign="top">The output template says how to make assembler code + from such an insn. +</td></tr> +<tr><td align="left" valign="top">• <a href="Output-Statement.html#Output-Statement" accesskey="6">Output Statement</a>:</td><td> </td><td align="left" valign="top">For more generality, write C code to output + the assembler code. +</td></tr> +<tr><td align="left" valign="top">• <a href="Predicates.html#Predicates" accesskey="7">Predicates</a>:</td><td> </td><td align="left" valign="top">Controlling what kinds of operands can be used + for an insn. +</td></tr> +<tr><td align="left" valign="top">• <a href="Constraints.html#Constraints" accesskey="8">Constraints</a>:</td><td> </td><td align="left" valign="top">Fine-tuning operand selection. +</td></tr> +<tr><td align="left" valign="top">• <a href="Standard-Names.html#Standard-Names" accesskey="9">Standard Names</a>:</td><td> </td><td align="left" valign="top">Names mark patterns to use for code generation. +</td></tr> +<tr><td align="left" valign="top">• <a href="Pattern-Ordering.html#Pattern-Ordering">Pattern Ordering</a>:</td><td> </td><td align="left" valign="top">When the order of patterns makes a difference. +</td></tr> +<tr><td align="left" valign="top">• <a href="Dependent-Patterns.html#Dependent-Patterns">Dependent Patterns</a>:</td><td> </td><td align="left" valign="top">Having one pattern may make you need another. +</td></tr> +<tr><td align="left" valign="top">• <a href="Jump-Patterns.html#Jump-Patterns">Jump Patterns</a>:</td><td> </td><td align="left" valign="top">Special considerations for patterns for jump insns. +</td></tr> +<tr><td align="left" valign="top">• <a href="Looping-Patterns.html#Looping-Patterns">Looping Patterns</a>:</td><td> </td><td align="left" valign="top">How to define patterns for special looping insns. +</td></tr> +<tr><td align="left" valign="top">• <a href="Insn-Canonicalizations.html#Insn-Canonicalizations">Insn Canonicalizations</a>:</td><td> </td><td align="left" valign="top">Canonicalization of Instructions +</td></tr> +<tr><td align="left" valign="top">• <a href="Expander-Definitions.html#Expander-Definitions">Expander Definitions</a>:</td><td> </td><td align="left" valign="top">Generating a sequence of several RTL insns + for a standard operation. +</td></tr> +<tr><td align="left" valign="top">• <a href="Insn-Splitting.html#Insn-Splitting">Insn Splitting</a>:</td><td> </td><td align="left" valign="top">Splitting Instructions into Multiple Instructions. +</td></tr> +<tr><td align="left" valign="top">• <a href="Including-Patterns.html#Including-Patterns">Including Patterns</a>:</td><td> </td><td align="left" valign="top">Including Patterns in Machine Descriptions. +</td></tr> +<tr><td align="left" valign="top">• <a href="Peephole-Definitions.html#Peephole-Definitions">Peephole Definitions</a>:</td><td> </td><td align="left" valign="top">Defining machine-specific peephole optimizations. +</td></tr> +<tr><td align="left" valign="top">• <a href="Insn-Attributes.html#Insn-Attributes">Insn Attributes</a>:</td><td> </td><td align="left" valign="top">Specifying the value of attributes for generated insns. +</td></tr> +<tr><td align="left" valign="top">• <a href="Conditional-Execution.html#Conditional-Execution">Conditional Execution</a>:</td><td> </td><td align="left" valign="top">Generating <code>define_insn</code> patterns for + predication. +</td></tr> +<tr><td align="left" valign="top">• <a href="Define-Subst.html#Define-Subst">Define Subst</a>:</td><td> </td><td align="left" valign="top">Generating <code>define_insn</code> and <code>define_expand</code> + patterns from other patterns. +</td></tr> +<tr><td align="left" valign="top">• <a href="Constant-Definitions.html#Constant-Definitions">Constant Definitions</a>:</td><td> </td><td align="left" valign="top">Defining symbolic constants that can be used in the + md file. +</td></tr> +<tr><td align="left" valign="top">• <a href="Iterators.html#Iterators">Iterators</a>:</td><td> </td><td align="left" valign="top">Using iterators to generate patterns from a template. +</td></tr> +</table> + +<hr> +<div class="header"> +<p> +Next: <a href="Target-Macros.html#Target-Macros" accesskey="n" rel="next">Target Macros</a>, Previous: <a href="Loop-Analysis-and-Representation.html#Loop-Analysis-and-Representation" accesskey="p" rel="previous">Loop Analysis and Representation</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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> +</div> + + + +</body> +</html> |