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.
82 lines
3.2 KiB
HTML
82 lines
3.2 KiB
HTML
4 years ago
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>Match and Simplify - GNU Compiler Collection (GCC) Internals</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="GNU Compiler Collection (GCC) Internals">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="prev" href="LTO.html#LTO" title="LTO">
|
||
|
|
<link rel="next" href="Funding.html#Funding" title="Funding">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
Copyright (C) 1988-2015 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.-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family:serif; font-weight:normal; }
|
||
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="Match-and-Simplify"></a>
|
||
|
|
<p>
|
||
|
|
Next: <a rel="next" accesskey="n" href="Funding.html#Funding">Funding</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="LTO.html#LTO">LTO</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h2 class="chapter">25 Match and Simplify</h2>
|
||
|
|
|
||
|
|
<p><a name="index-Match-and-Simplify-5111"></a>
|
||
|
|
The GIMPLE and GENERIC pattern matching project match-and-simplify
|
||
|
|
tries to address several issues.
|
||
|
|
|
||
|
|
<ol type=1 start=1>
|
||
|
|
<li>unify expression simplifications currently spread and duplicated
|
||
|
|
over separate files like fold-const.c, gimple-fold.c and builtins.c
|
||
|
|
<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
|
||
|
|
</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.
|
||
|
|
|
||
|
|
<ul class="menu">
|
||
|
|
<li><a accesskey="1" href="GIMPLE-API.html#GIMPLE-API">GIMPLE API</a>
|
||
|
|
<li><a accesskey="2" href="The-Language.html#The-Language">The Language</a>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
</body></html>
|
||
|
|
|