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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
2<html>
3<head>
4<title>LuaJIT</title>
5<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
6<meta name="Author" content="Mike Pall">
7<meta name="Copyright" content="Copyright (C) 2005-2011, Mike Pall">
8<meta name="Language" content="en">
9<link rel="stylesheet" type="text/css" href="bluequad.css" media="screen">
10<link rel="stylesheet" type="text/css" href="bluequad-print.css" media="print">
11<meta name="description" content="LuaJIT is a Just-In-Time (JIT) compiler for the Lua language.">
12</head>
13<body>
14<div id="site">
15<a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
16</div>
17<div id="head">
18<h1>LuaJIT</h1>
19</div>
20<div id="nav">
21<ul><li>
22<a class="current" href="luajit.html">LuaJIT</a>
23<ul><li>
24<a href="install.html">Installation</a>
25</li><li>
26<a href="running.html">Running</a>
27</li></ul>
28</li><li>
29<a href="extensions.html">Extensions</a>
30<ul><li>
31<a href="ext_ffi.html">FFI Library</a>
32<ul><li>
33<a href="ext_ffi_tutorial.html">FFI Tutorial</a>
34</li><li>
35<a href="ext_ffi_api.html">ffi.* API</a>
36</li><li>
37<a href="ext_ffi_semantics.html">FFI Semantics</a>
38</li></ul>
39</li><li>
40<a href="ext_jit.html">jit.* Library</a>
41</li><li>
42<a href="ext_c_api.html">Lua/C API</a>
43</li></ul>
44</li><li>
45<a href="status.html">Status</a>
46<ul><li>
47<a href="changes.html">Changes</a>
48</li></ul>
49</li><li>
50<a href="faq.html">FAQ</a>
51</li><li>
52<a href="http://luajit.org/performance.html">Performance <span class="ext">&raquo;</span></a>
53</li><li>
54<a href="http://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
55</li></ul>
56</div>
57<div id="main">
58<p>
59LuaJIT is a <b>Just-In-Time Compiler</b> for the Lua<sup>*</sup>
60programming language.
61</p>
62<p>
63LuaJIT is Copyright &copy; 2005-2011 Mike Pall.
64LuaJIT is open source software, released under the
65<a href="http://www.opensource.org/licenses/mit-license.php"><span class="ext">&raquo;</span>&nbsp;MIT license</a>.
66</p>
67<p class="indent" style="color: #606060;">
68* Lua is a powerful, dynamic and light-weight programming language
69designed for extending applications. Lua is also frequently used as a
70general-purpose, stand-alone language. More information about
71Lua can be found at: <a href="http://www.lua.org/"><span class="ext">&raquo;</span>&nbsp;http://www.lua.org/</a>
72</p>
73<h2>Compatibility</h2>
74<p>
75LuaJIT implements the full set of language features defined by Lua 5.1.
76The virtual machine (VM) is <b>API- and ABI-compatible</b> to the
77standard Lua interpreter and can be deployed as a drop-in replacement.
78</p>
79<p>
80LuaJIT offers more performance, at the expense of portability. It
81currently runs on all popular operating systems based on
82<b>x86</b> or <b>x64</b> CPUs (Linux, Windows, OSX etc.) or embedded
83systems based on <b>ARM</b> (Android, iOS) or <b>PPC</b> CPUs.
84Other platforms will be supported in the future, based on user demand
85and sponsoring.
86</p>
87
88<h2>Overview</h2>
89<p>
90LuaJIT has been successfully used as a <b>scripting middleware</b> in
91games, 3D modellers, numerical simulations, trading platforms and many
92other specialty applications. It combines high flexibility with high
93performance and an unmatched <b>low memory footprint</b>: less than
94<b>125K</b> for the VM plus less than <b>85K</b> for the JIT compiler (on x86).
95</p>
96<p>
97LuaJIT has been in continuous development since 2005. It's widely
98considered to be <b>one of the fastest dynamic language
99implementations</b>. It has outperformed other dynamic languages on many
100cross-language benchmarks since its first release &mdash; often by a
101substantial margin. In 2009 other dynamic language VMs started to catch up
102with the performance of LuaJIT 1.x. Well, I couldn't let that slide. ;-)
103</p>
104<p>
1052009 also marks the first release of the long-awaited <b>LuaJIT 2.0</b>.
106The whole VM has been rewritten from the ground up and relentlessly
107optimized for performance. It combines a high-speed interpreter,
108written in assembler, with a state-of-the-art JIT compiler.
109</p>
110<p>
111An innovative <b>trace compiler</b> is integrated with advanced,
112SSA-based optimizations and a highly tuned code generation backend. This
113allows a substantial reduction of the overhead associated with dynamic
114language features.
115</p>
116<p>
117It's destined to break into the <a href="http://luajit.org/performance.html"><span class="ext">&raquo;</span>&nbsp;performance</a>
118range traditionally reserved for offline, static language compilers.
119</p>
120
121<h2>More ...</h2>
122<p>
123Click on the LuaJIT sub-topics in the navigation bar to learn more
124about LuaJIT.
125</p>
126<p><p>
127Click on the Logo in the upper left corner to visit
128the LuaJIT project page on the web. All other links to online
129resources are marked with a '<span class="ext">&raquo;</span>'.
130</p>
131<br class="flush">
132</div>
133<div id="foot">
134<hr class="hide">
135Copyright &copy; 2005-2011 Mike Pall
136<span class="noprint">
137&middot;
138<a href="contact.html">Contact</a>
139</span>
140</div>
141</body>
142</html>
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