You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
4.6 KiB
HTML
110 lines
4.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2018 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 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Match and Simplify (GNU Compiler Collection (GCC) Internals)</title>
|
|
|
|
<meta name="description" content="Match and Simplify (GNU Compiler Collection (GCC) Internals)">
|
|
<meta name="keywords" content="Match and Simplify (GNU Compiler Collection (GCC) Internals)">
|
|
<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="GIMPLE-API.html#GIMPLE-API" rel="next" title="GIMPLE API">
|
|
<link href="Internal-flags.html#Internal-flags" rel="prev" title="Internal flags">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
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.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Match-and-Simplify"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Funding.html#Funding" accesskey="n" rel="next">Funding</a>, Previous: <a href="LTO.html#LTO" accesskey="p" rel="prev">LTO</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="Match-and-Simplify-1"></a>
|
|
<h2 class="chapter">26 Match and Simplify</h2>
|
|
<a name="index-Match-and-Simplify"></a>
|
|
|
|
<p>The GIMPLE and GENERIC pattern matching project match-and-simplify
|
|
tries to address several issues.
|
|
</p>
|
|
<ol>
|
|
<li> unify expression simplifications currently spread and duplicated
|
|
over separate files like fold-const.c, gimple-fold.c and builtins.c
|
|
</li><li> allow for a cheap way to implement building and simplifying
|
|
non-trivial GIMPLE expressions, avoiding the need to go through
|
|
building and simplifying GENERIC via fold_buildN and then
|
|
gimplifying via force_gimple_operand
|
|
</li></ol>
|
|
|
|
<p>To address these the project introduces a simple domain specific language
|
|
to write expression simplifications from which code targeting GIMPLE
|
|
and GENERIC is auto-generated. The GENERIC variant follows the
|
|
fold_buildN API while for the GIMPLE variant and to address 2) new
|
|
APIs are introduced.
|
|
</p>
|
|
<table class="menu" border="0" cellspacing="0">
|
|
<tr><td align="left" valign="top">• <a href="GIMPLE-API.html#GIMPLE-API" accesskey="1">GIMPLE API</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="The-Language.html#The-Language" accesskey="2">The Language</a>:</td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
</table>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|