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110 lines
4.6 KiB
HTML
110 lines
4.6 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>Match and Simplify (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Match and Simplify (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Match and Simplify (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="index.html#Top" rel="up" title="Top">
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<link href="GIMPLE-API.html#GIMPLE-API" rel="next" title="GIMPLE API">
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<link href="Internal-flags.html#Internal-flags" rel="prev" title="Internal flags">
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</style>
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</head>
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<body lang="en">
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<a name="Match-and-Simplify"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Match-and-Simplify-1"></a>
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<h2 class="chapter">26 Match and Simplify</h2>
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<a name="index-Match-and-Simplify"></a>
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<p>The GIMPLE and GENERIC pattern matching project match-and-simplify
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tries to address several issues.
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</p>
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<ol>
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<li> unify expression simplifications currently spread and duplicated
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over separate files like fold-const.c, gimple-fold.c and builtins.c
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</li><li> allow for a cheap way to implement building and simplifying
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non-trivial GIMPLE expressions, avoiding the need to go through
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building and simplifying GENERIC via fold_buildN and then
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gimplifying via force_gimple_operand
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</li></ol>
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<p>To address these the project introduces a simple domain specific language
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to write expression simplifications from which code targeting GIMPLE
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and GENERIC is auto-generated. The GENERIC variant follows the
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fold_buildN API while for the GIMPLE variant and to address 2) new
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APIs are introduced.
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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="GIMPLE-API.html#GIMPLE-API" accesskey="1">GIMPLE API</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<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">
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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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