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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 Change History</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) 2005-2009, Mike Pall">
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15<body>
16<div id="site">
17<a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
18</div>
19<div id="head">
20<h1>LuaJIT Change History</h1>
21</div>
22<div id="nav">
23<ul><li>
24<a href="luajit.html">LuaJIT</a>
25<ul><li>
26<a href="install.html">Installation</a>
27</li><li>
28<a href="running.html">Running</a>
29</li><li>
30<a href="api.html">API Extensions</a>
31</li></ul>
32</li><li>
33<a href="status.html">Status</a>
34<ul><li>
35<a class="current" href="changes.html">Changes</a>
36</li></ul>
37</li><li>
38<a href="faq.html">FAQ</a>
39</li><li>
40<a href="http://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
41</li></ul>
42</div>
43<div id="main">
44<p>
45This is a list of changes between the released versions of LuaJIT.<br>
46The current <span style="color: #c00000;">development version</span> is <strong>LuaJIT&nbsp;2.0.0-beta1</strong>.<br>
47The current <span style="color: #0000c0;">stable version</span> is <strong>LuaJIT&nbsp;1.1.5</strong>.
48</p>
49<p>
50Please check the
51<a href="http://luajit.org/luajit_changes.html"><span class="ext">&raquo;</span>&nbsp;Online Change History</a>
52to see whether newer versions are available.
53</p>
54
55<div class="major" style="background: #ffd0d0;">
56<h2 id="LuaJIT-2.0.0-beta1">LuaJIT 2.0.0-beta1 &mdash; 2009-10-31</h2>
57<ul>
58<li>This is the first public release of LuaJIT 2.0.</li>
59<li>The whole VM has been rewritten from the ground up, so there's
60no point in listing differences over earlier versions.</li>
61</ul>
62</div>
63
64<div class="major" style="background: #d0d0ff;">
65<h2 id="LuaJIT-1.1.5">LuaJIT 1.1.5 &mdash; 2008-10-25</h2>
66<ul>
67<li>Merged with Lua 5.1.4. Fixes all
68<a href="http://www.lua.org/bugs.html#5.1.3"><span class="ext">&raquo;</span>&nbsp;known bugs in Lua 5.1.3</a>.</li>
69</ul>
70
71<h2 id="LuaJIT-1.1.4">LuaJIT 1.1.4 &mdash; 2008-02-05</h2>
72<ul>
73<li>Merged with Lua 5.1.3. Fixes all
74<a href="http://www.lua.org/bugs.html#5.1.2"><span class="ext">&raquo;</span>&nbsp;known bugs in Lua 5.1.2</a>.</li>
75<li>Fixed possible (but unlikely) stack corruption while compiling
76<tt>k^x</tt> expressions.</li>
77<li>Fixed DynASM template for cmpss instruction.</li>
78</ul>
79
80<h2 id="LuaJIT-1.1.3">LuaJIT 1.1.3 &mdash; 2007-05-24</h2>
81<ul>
82<li>Merged with Lua 5.1.2. Fixes all
83<a href="http://www.lua.org/bugs.html#5.1.1"><span class="ext">&raquo;</span>&nbsp;known bugs in Lua 5.1.1</a>.</li>
84<li>Merged pending Lua 5.1.x fixes: "return -nil" bug, spurious count hook call.</li>
85<li>Remove a (sometimes) wrong assertion in <tt>luaJIT_findpc()</tt>.</li>
86<li>DynASM now allows labels for displacements and <tt>.aword</tt>.</li>
87<li>Fix some compiler warnings for DynASM glue (internal API change).</li>
88<li>Correct naming for SSSE3 (temporarily known as SSE4) in DynASM and x86 disassembler.</li>
89<li>The loadable debug modules now handle redirection to stdout
90(e.g. <tt>-j&nbsp;trace=-</tt>).</li>
91</ul>
92
93<h2 id="LuaJIT-1.1.2">LuaJIT 1.1.2 &mdash; 2006-06-24</h2>
94<ul>
95<li>Fix MSVC inline assembly: use only local variables with
96<tt>lua_number2int()</tt>.</li>
97<li>Fix "attempt to call a thread value" bug on Mac OS X:
98make values of consts used as lightuserdata keys unique
99to avoid joining by the compiler/linker.</li>
100</ul>
101
102<h2 id="LuaJIT-1.1.1">LuaJIT 1.1.1 &mdash; 2006-06-20</h2>
103<ul>
104<li>Merged with Lua 5.1.1. Fixes all
105<a href="http://www.lua.org/bugs.html#5.1"><span class="ext">&raquo;</span>&nbsp;known bugs in Lua 5.1</a>.</li>
106<li>Enforce (dynamic) linker error for EXE/DLL version mismatches.</li>
107<li>Minor changes to DynASM: faster preprocessing, smaller encoding
108for some immediates.</li>
109</ul>
110<p>
111This release is in sync with Coco 1.1.1 (see the
112<a href="http://coco.luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Coco Change History</a>).
113</p>
114
115<h2 id="LuaJIT-1.1.0">LuaJIT 1.1.0 &mdash; 2006-03-13</h2>
116<ul>
117<li>Merged with Lua 5.1 (final).</li>
118
119<li>New JIT call frame setup:
120<ul>
121<li>The C stack is kept 16 byte aligned (faster).
122Mandatory for Mac OS X on Intel, too.</li>
123<li>Faster calling conventions for internal C helper functions.</li>
124<li>Better instruction scheduling for function prologue, OP_CALL and
125OP_RETURN.</li>
126</ul></li>
127
128<li>Miscellaneous optimizations:
129<ul>
130<li>Faster loads of FP constants. Remove narrow-to-wide store-to-load
131forwarding stalls.</li>
132<li>Use (scalar) SSE2 ops (if the CPU supports it) to speed up slot moves
133and FP to integer conversions.</li>
134<li>Optimized the two-argument form of <tt>OP_CONCAT</tt> (<tt>a..b</tt>).</li>
135<li>Inlined <tt>OP_MOD</tt> (<tt>a%b</tt>).
136With better accuracy than the C variant, too.</li>
137<li>Inlined <tt>OP_POW</tt> (<tt>a^b</tt>). Unroll <tt>x^k</tt> or
138use <tt>k^x = 2^(log2(k)*x)</tt> or call <tt>pow()</tt>.</li>
139</ul></li>
140
141<li>Changes in the optimizer:
142<ul>
143<li>Improved hinting for table keys derived from table values
144(<tt>t1[t2[x]]</tt>).</li>
145<li>Lookup hinting now works with arbitrary object types and
146supports index chains, too.</li>
147<li>Generate type hints for arithmetic and comparison operators,
148OP_LEN, OP_CONCAT and OP_FORPREP.</li>
149<li>Remove several hint definitions in favour of a generic COMBINE hint.</li>
150<li>Complete rewrite of <tt>jit.opt_inline</tt> module
151(ex <tt>jit.opt_lib</tt>).</li>
152</ul></li>
153
154<li>Use adaptive deoptimization:
155<ul>
156<li>If runtime verification of a contract fails, the affected
157instruction is recompiled and patched on-the-fly.
158Regular programs will trigger deoptimization only occasionally.</li>
159<li>This avoids generating code for uncommon fallback cases
160most of the time. Generated code is up to 30% smaller compared to
161LuaJIT&nbsp;1.0.3.</li>
162<li>Deoptimization is used for many opcodes and contracts:
163<ul>
164<li>OP_CALL, OP_TAILCALL: type mismatch for callable.</li>
165<li>Inlined calls: closure mismatch, parameter number and type mismatches.</li>
166<li>OP_GETTABLE, OP_SETTABLE: table or key type and range mismatches.</li>
167<li>All arithmetic and comparison operators, OP_LEN, OP_CONCAT,
168OP_FORPREP: operand type and range mismatches.</li>
169</ul></li>
170<li>Complete redesign of the debug and traceback info
171(bytecode &harr; mcode) to support deoptimization.
172Much more flexible and needs only 50% of the space.</li>
173<li>The modules <tt>jit.trace</tt>, <tt>jit.dumphints</tt> and
174<tt>jit.dump</tt> handle deoptimization.</li>
175</ul></li>
176
177<li>Inlined many popular library functions
178(for commonly used arguments only):
179<ul>
180<li>Most <tt>math.*</tt> functions (the 18 most used ones)
181[2x-10x faster].</li>
182<li><tt>string.len</tt>, <tt>string.sub</tt> and <tt>string.char</tt>
183[2x-10x faster].</li>
184<li><tt>table.insert</tt>, <tt>table.remove</tt> and <tt>table.getn</tt>
185[3x-5x faster].</li>
186<li><tt>coroutine.yield</tt> and <tt>coroutine.resume</tt>
187[3x-5x faster].</li>
188<li><tt>pairs</tt>, <tt>ipairs</tt> and the corresponding iterators
189[8x-15x faster].</li>
190</ul></li>
191
192<li>Changes in the core and loadable modules and the stand-alone executable:
193<ul>
194<li>Added <tt>jit.version</tt>, <tt>jit.version_num</tt>
195and <tt>jit.arch</tt>.</li>
196<li>Reorganized some internal API functions (<tt>jit.util.*mcode*</tt>).</li>
197<li>The <tt>-j dump</tt> output now shows JSUB names, too.</li>
198<li>New x86 disassembler module written in pure Lua. No dependency
199on ndisasm anymore. Flexible API, very compact (500 lines)
200and complete (x87, MMX, SSE, SSE2, SSE3, SSSE3, privileged instructions).</li>
201<li><tt>luajit -v</tt> prints the LuaJIT version and copyright
202on a separate line.</li>
203</ul></li>
204
205<li>Added SSE, SSE2, SSE3 and SSSE3 support to DynASM.</li>
206<li>Miscellaneous doc changes. Added a section about
207<a href="luajit_install.html#embedding">embedding LuaJIT</a>.</li>
208</ul>
209<p>
210This release is in sync with Coco 1.1.0 (see the
211<a href="http://coco.luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Coco Change History</a>).
212</p>
213</div>
214
215<div class="major" style="background: #ffffd0;">
216<h2 id="LuaJIT-1.0.3">LuaJIT 1.0.3 &mdash; 2005-09-08</h2>
217<ul>
218<li>Even more docs.</li>
219<li>Unified closure checks in <tt>jit.*</tt>.</li>
220<li>Fixed some range checks in <tt>jit.util.*</tt>.</li>
221<li>Fixed __newindex call originating from <tt>jit_settable_str()</tt>.</li>
222<li>Merged with Lua 5.1 alpha (including early bugfixes).</li>
223</ul>
224<p>
225This is the first public release of LuaJIT.
226</p>
227
228<h2 id="LuaJIT-1.0.2">LuaJIT 1.0.2 &mdash; 2005-09-02</h2>
229<ul>
230<li>Add support for flushing the Valgrind translation cache <br>
231(<tt>MYCFLAGS= -DUSE_VALGRIND</tt>).</li>
232<li>Add support for freeing executable mcode memory to the <tt>mmap()</tt>-based
233variant for POSIX systems.</li>
234<li>Reorganized the C&nbsp;function signature handling in
235<tt>jit.opt_lib</tt>.</li>
236<li>Changed to index-based hints for inlining C&nbsp;functions.
237Still no support in the backend for inlining.</li>
238<li>Hardcode <tt>HEAP_CREATE_ENABLE_EXECUTE</tt> value if undefined.</li>
239<li>Misc. changes to the <tt>jit.*</tt> modules.</li>
240<li>Misc. changes to the Makefiles.</li>
241<li>Lots of new docs.</li>
242<li>Complete doc reorg.</li>
243</ul>
244<p>
245Not released because Lua 5.1 alpha came out today.
246</p>
247
248<h2 id="LuaJIT-1.0.1">LuaJIT 1.0.1 &mdash; 2005-08-31</h2>
249<ul>
250<li>Missing GC step in <tt>OP_CONCAT</tt>.</li>
251<li>Fix result handling for C &ndash;> JIT calls.</li>
252<li>Detect CPU feature bits.</li>
253<li>Encode conditional moves (<tt>fucomip</tt>) only when supported.</li>
254<li>Add fallback instructions for FP compares.</li>
255<li>Add support for <tt>LUA_COMPAT_VARARG</tt>. Still disabled by default.</li>
256<li>MSVC needs a specific place for the <tt>CALLBACK</tt> attribute
257(David Burgess).</li>
258<li>Misc. doc updates.</li>
259</ul>
260<p>
261Interim non-public release.
262Special thanks to Adam D. Moss for reporting most of the bugs.
263</p>
264
265<h2 id="LuaJIT-1.0.0">LuaJIT 1.0.0 &mdash; 2005-08-29</h2>
266<p>
267This is the initial non-public release of LuaJIT.
268</p>
269</div>
270<br class="flush">
271</div>
272<div id="foot">
273<hr class="hide">
274Copyright &copy; 2005-2009 Mike Pall
275<span class="noprint">
276&middot;
277<a href="contact.html">Contact</a>
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