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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>LuaJIT Change History</title>
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<a href="http://luajit.org/"><span>Lua<span id="logo">JIT</span></span></a>
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<h1>LuaJIT Change History</h1>
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<div id="main">
<p>
This is a list of changes between the released versions of LuaJIT.
The current version is <strong>LuaJIT 1.1.7</strong>.
</p>
<p>
Please check the
<a href="http://luajit.org/changes.html"><span class="ext">»</span> Online Change History</a>
to see whether newer versions are available.
</p>
<h2 id="LuaJIT-1.1.7">LuaJIT 1.1.7 — 2011-05-05</h2>
<ul>
<li>Added fixes for the
<a href="http://www.lua.org/bugs.html#5.1.4"><span class="ext">»</span> currently known bugs in Lua 5.1.4</a>.</li>
</ul>
<h2 id="LuaJIT-1.1.6">LuaJIT 1.1.6 — 2010-03-28</h2>
<ul>
<li>Added fixes for the
<a href="http://www.lua.org/bugs.html#5.1.4"><span class="ext">»</span> currently known bugs in Lua 5.1.4</a>.</li>
<li>Removed wrong GC check in <tt>jit_createstate()</tt>.
Thanks to Tim Mensch.</li>
<li>Fixed bad assertions while compiling <tt>table.insert()</tt> and
<tt>table.remove()</tt>.</li>
</ul>
<h2 id="LuaJIT-1.1.5">LuaJIT 1.1.5 — 2008-10-25</h2>
<ul>
<li>Merged with Lua 5.1.4. Fixes all
<a href="http://www.lua.org/bugs.html#5.1.3"><span class="ext">»</span> known bugs in Lua 5.1.3</a>.</li>
</ul>
<h2 id="LuaJIT-1.1.4">LuaJIT 1.1.4 — 2008-02-05</h2>
<ul>
<li>Merged with Lua 5.1.3. Fixes all
<a href="http://www.lua.org/bugs.html#5.1.2"><span class="ext">»</span> known bugs in Lua 5.1.2</a>.</li>
<li>Fixed possible (but unlikely) stack corruption while compiling
<tt>k^x</tt> expressions.</li>
<li>Fixed DynASM template for cmpss instruction.</li>
</ul>
<h2 id="LuaJIT-1.1.3">LuaJIT 1.1.3 — 2007-05-24</h2>
<ul>
<li>Merged with Lua 5.1.2. Fixes all
<a href="http://www.lua.org/bugs.html#5.1.1"><span class="ext">»</span> known bugs in Lua 5.1.1</a>.</li>
<li>Merged pending Lua 5.1.x fixes: "return -nil" bug, spurious count hook call.</li>
<li>Remove a (sometimes) wrong assertion in <tt>luaJIT_findpc()</tt>.</li>
<li>DynASM now allows labels for displacements and <tt>.aword</tt>.</li>
<li>Fix some compiler warnings for DynASM glue (internal API change).</li>
<li>Correct naming for SSSE3 (temporarily known as SSE4) in DynASM and x86 disassembler.</li>
<li>The loadable debug modules now handle redirection to stdout
(e.g. <tt>-j trace=-</tt>).</li>
</ul>
<h2 id="LuaJIT-1.1.2">LuaJIT 1.1.2 — 2006-06-24</h2>
<ul>
<li>Fix MSVC inline assembly: use only local variables with
<tt>lua_number2int()</tt>.</li>
<li>Fix "attempt to call a thread value" bug on Mac OS X:
make values of consts used as lightuserdata keys unique
to avoid joining by the compiler/linker.</li>
</ul>
<h2 id="LuaJIT-1.1.1">LuaJIT 1.1.1 — 2006-06-20</h2>
<ul>
<li>Merged with Lua 5.1.1. Fixes all
<a href="http://www.lua.org/bugs.html#5.1"><span class="ext">»</span> known bugs in Lua 5.1</a>.</li>
<li>Enforce (dynamic) linker error for EXE/DLL version mismatches.</li>
<li>Minor changes to DynASM: faster preprocessing, smaller encoding
for some immediates.</li>
</ul>
<p>
This release is in sync with Coco 1.1.1 (see the
<a href="coco_changes.html">Coco Change History</a>).
</p>
<h2 id="LuaJIT-1.1.0">LuaJIT 1.1.0 — 2006-03-13</h2>
<ul>
<li>Merged with Lua 5.1 (final).</li>
<li>New JIT call frame setup:
<ul>
<li>The C stack is kept 16 byte aligned (faster).
Mandatory for Mac OS X on Intel, too.</li>
<li>Faster calling conventions for internal C helper functions.</li>
<li>Better instruction scheduling for function prologue, OP_CALL and
OP_RETURN.</li>
</ul></li>
<li>Miscellaneous optimizations:
<ul>
<li>Faster loads of FP constants. Remove narrow-to-wide store-to-load
forwarding stalls.</li>
<li>Use (scalar) SSE2 ops (if the CPU supports it) to speed up slot moves
and FP to integer conversions.</li>
<li>Optimized the two-argument form of <tt>OP_CONCAT</tt> (<tt>a..b</tt>).</li>
<li>Inlined <tt>OP_MOD</tt> (<tt>a%b</tt>).
With better accuracy than the C variant, too.</li>
<li>Inlined <tt>OP_POW</tt> (<tt>a^b</tt>). Unroll <tt>x^k</tt> or
use <tt>k^x = 2^(log2(k)*x)</tt> or call <tt>pow()</tt>.</li>
</ul></li>
<li>Changes in the optimizer:
<ul>
<li>Improved hinting for table keys derived from table values
(<tt>t1[t2[x]]</tt>).</li>
<li>Lookup hinting now works with arbitrary object types and
supports index chains, too.</li>
<li>Generate type hints for arithmetic and comparison operators,
OP_LEN, OP_CONCAT and OP_FORPREP.</li>
<li>Remove several hint definitions in favour of a generic COMBINE hint.</li>
<li>Complete rewrite of <tt>jit.opt_inline</tt> module
(ex <tt>jit.opt_lib</tt>).</li>
</ul></li>
<li>Use adaptive deoptimization:
<ul>
<li>If runtime verification of a contract fails, the affected
instruction is recompiled and patched on-the-fly.
Regular programs will trigger deoptimization only occasionally.</li>
<li>This avoids generating code for uncommon fallback cases
most of the time. Generated code is up to 30% smaller compared to
LuaJIT 1.0.3.</li>
<li>Deoptimization is used for many opcodes and contracts:
<ul>
<li>OP_CALL, OP_TAILCALL: type mismatch for callable.</li>
<li>Inlined calls: closure mismatch, parameter number and type mismatches.</li>
<li>OP_GETTABLE, OP_SETTABLE: table or key type and range mismatches.</li>
<li>All arithmetic and comparison operators, OP_LEN, OP_CONCAT,
OP_FORPREP: operand type and range mismatches.</li>
</ul></li>
<li>Complete redesign of the debug and traceback info
(bytecode ↔ mcode) to support deoptimization.
Much more flexible and needs only 50% of the space.</li>
<li>The modules <tt>jit.trace</tt>, <tt>jit.dumphints</tt> and
<tt>jit.dump</tt> handle deoptimization.</li>
</ul></li>
<li>Inlined many popular library functions
(for commonly used arguments only):
<ul>
<li>Most <tt>math.*</tt> functions (the 18 most used ones)
[2x-10x faster].</li>
<li><tt>string.len</tt>, <tt>string.sub</tt> and <tt>string.char</tt>
[2x-10x faster].</li>
<li><tt>table.insert</tt>, <tt>table.remove</tt> and <tt>table.getn</tt>
[3x-5x faster].</li>
<li><tt>coroutine.yield</tt> and <tt>coroutine.resume</tt>
[3x-5x faster].</li>
<li><tt>pairs</tt>, <tt>ipairs</tt> and the corresponding iterators
[8x-15x faster].</li>
</ul></li>
<li>Changes in the core and loadable modules and the stand-alone executable:
<ul>
<li>Added <tt>jit.version</tt>, <tt>jit.version_num</tt>
and <tt>jit.arch</tt>.</li>
<li>Reorganized some internal API functions (<tt>jit.util.*mcode*</tt>).</li>
<li>The <tt>-j dump</tt> output now shows JSUB names, too.</li>
<li>New x86 disassembler module written in pure Lua. No dependency
on ndisasm anymore. Flexible API, very compact (500 lines)
and complete (x87, MMX, SSE, SSE2, SSE3, SSSE3, privileged instructions).</li>
<li><tt>luajit -v</tt> prints the LuaJIT version and copyright
on a separate line.</li>
</ul></li>
<li>Added SSE, SSE2, SSE3 and SSSE3 support to DynASM.</li>
<li>Miscellaneous doc changes. Added a section about
<a href="luajit_install.html#embedding">embedding LuaJIT</a>.</li>
</ul>
<p>
This release is in sync with Coco 1.1.0 (see the
<a href="coco_changes.html">Coco Change History</a>).
</p>
<h2 id="LuaJIT-1.0.3">LuaJIT 1.0.3 — 2005-09-08</h2>
<ul>
<li>Even more docs.</li>
<li>Unified closure checks in <tt>jit.*</tt>.</li>
<li>Fixed some range checks in <tt>jit.util.*</tt>.</li>
<li>Fixed __newindex call originating from <tt>jit_settable_str()</tt>.</li>
<li>Merged with Lua 5.1 alpha (including early bugfixes).</li>
</ul>
<p>
This is the first public release of LuaJIT.
</p>
<h2 id="LuaJIT-1.0.2">LuaJIT 1.0.2 — 2005-09-02</h2>
<ul>
<li>Add support for flushing the Valgrind translation cache <br>
(<tt>MYCFLAGS= -DUSE_VALGRIND</tt>).</li>
<li>Add support for freeing executable mcode memory to the <tt>mmap()</tt>-based
variant for POSIX systems.</li>
<li>Reorganized the C function signature handling in
<tt>jit.opt_lib</tt>.</li>
<li>Changed to index-based hints for inlining C functions.
Still no support in the backend for inlining.</li>
<li>Hardcode <tt>HEAP_CREATE_ENABLE_EXECUTE</tt> value if undefined.</li>
<li>Misc. changes to the <tt>jit.*</tt> modules.</li>
<li>Misc. changes to the Makefiles.</li>
<li>Lots of new docs.</li>
<li>Complete doc reorg.</li>
</ul>
<p>
Not released because Lua 5.1 alpha came out today.
</p>
<h2 id="LuaJIT-1.0.1">LuaJIT 1.0.1 — 2005-08-31</h2>
<ul>
<li>Missing GC step in <tt>OP_CONCAT</tt>.</li>
<li>Fix result handling for C –> JIT calls.</li>
<li>Detect CPU feature bits.</li>
<li>Encode conditional moves (<tt>fucomip</tt>) only when supported.</li>
<li>Add fallback instructions for FP compares.</li>
<li>Add support for <tt>LUA_COMPAT_VARARG</tt>. Still disabled by default.</li>
<li>MSVC needs a specific place for the <tt>CALLBACK</tt> attribute
(David Burgess).</li>
<li>Misc. doc updates.</li>
</ul>
<p>
Interim non-public release.
Special thanks to Adam D. Moss for reporting most of the bugs.
</p>
<h2 id="LuaJIT-1.0.0">LuaJIT 1.0.0 — 2005-08-29</h2>
<p>
This is the initial non-public release of LuaJIT.
</p>
<br class="flush">
</div>
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