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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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4<title>LuaJIT Change History</title>
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6<meta name="Author" content="Mike Pall">
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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></ul>
30</li><li>
31<a href="extensions.html">Extensions</a>
32<ul><li>
33<a href="ext_ffi.html">FFI Library</a>
34<ul><li>
35<a href="ext_ffi_tutorial.html">FFI Tutorial</a>
36</li><li>
37<a href="ext_ffi_api.html">ffi.* API</a>
38</li><li>
39<a href="ext_ffi_semantics.html">FFI Semantics</a>
40</li></ul>
41</li><li>
42<a href="ext_jit.html">jit.* Library</a>
43</li><li>
44<a href="ext_c_api.html">Lua/C API</a>
45</li></ul>
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47<a href="status.html">Status</a>
48<ul><li>
49<a class="current" href="changes.html">Changes</a>
50</li></ul>
51</li><li>
52<a href="faq.html">FAQ</a>
53</li><li>
54<a href="http://luajit.org/performance.html">Performance <span class="ext">&raquo;</span></a>
55</li><li>
56<a href="http://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
57</li></ul>
58</div>
59<div id="main">
60<p>
61This is a list of changes between the released versions of LuaJIT.<br>
62The current <span style="color: #c00000;">development version</span> is <strong>LuaJIT&nbsp;2.0.0-beta9</strong>.<br>
63The current <span style="color: #0000c0;">stable version</span> is <strong>LuaJIT&nbsp;1.1.7</strong>.
64</p>
65<p>
66Please check the
67<a href="http://luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Online Change History</a>
68to see whether newer versions are available.
69</p>
70
71<div class="major" style="background: #ffd0d0;">
72<h2 id="LuaJIT-2.0.0-beta9">LuaJIT 2.0.0-beta9 &mdash; 2011-12-14</h2>
73<ul>
74<li>New features:
75<ul>
76<li>PPC port of LuaJIT is complete. Default is the dual-number port
77(usually faster). Single-number port selectable via <tt>src/Makefile</tt>
78at build time.</li>
79<li>Add FFI callback support.</li>
80<li>Extend <tt>-b</tt> to generate <tt>.c</tt>, <tt>.h</tt> or <tt>.obj/.o</tt>
81files with embedded bytecode.</li>
82<li>Allow loading embedded bytecode with <tt>require()</tt>.</li>
83<li>From Lua 5.2: Change to <tt>'\z'</tt> escape. Reject undefined escape
84sequences.</li>
85</ul></li>
86<li>Correctness and completeness:
87<ul>
88<li>Fix OSX 10.7 build. Fix <tt>install_name</tt> and versioning on OSX.</li>
89<li>Fix iOS build.</li>
90<li>Install <tt>dis_arm.lua</tt>, too.</li>
91<li>Mark installed shared library as executable.</li>
92<li>Add debug option to <tt>msvcbuild.bat</tt> and improve error handling.</li>
93<li>Fix data-flow analysis for iterators.</li>
94<li>Fix forced unwinding triggered by external unwinder.</li>
95<li>Record missing <tt>for</tt> loop slot loads (return to lower frame).</li>
96<li>Always use ANSI variants of Windows system functions.</li>
97<li>Fix GC barrier for multi-result table constructor (<tt>TSETM</tt>).</li>
98<li>Fix/add various FOLD rules.</li>
99<li>Add potential PHI for number conversions due to type instability.</li>
100<li>Do not eliminate PHIs only referenced from other PHIs.</li>
101<li>Correctly anchor implicit number to string conversions in Lua/C API.</li>
102<li>Fix various stack limit checks.</li>
103<li>x64: Use thread-safe exceptions for external unwinding (GCC platforms).</li>
104<li>x64: Fix result type of cdata index conversions.</li>
105<li>x64: Fix <tt>math.random()</tt> and <tt>bit.bswap()</tt> code generation.</li>
106<li>x64: Fix <tt>lightuserdata</tt> comparisons.</li>
107<li>x64: Always extend stack-passed arguments to pointer size.</li>
108<li>ARM: Many fixes to code generation backend.</li>
109<li>PPC/e500: Fix dispatch for binop metamethods.</li>
110<li>PPC/e500: Save/restore condition registers when entering/leaving the VM.</li>
111<li>PPC/e500: Fix write barrier in stores of strings to upvalues.</li>
112</ul></li>
113<li>FFI library:
114<ul>
115<li>Fix C comment parsing.</li>
116<li>Fix snapshot optimization for cdata comparisons.</li>
117<li>Fix recording of const/enum lookups in namespaces.</li>
118<li>Fix call argument and return handling for <tt>I8/U8/I16/U16</tt> types.</li>
119<li>Fix unfused loads of float fields.</li>
120<li>Fix <tt>ffi.string()</tt> recording.</li>
121<li>Save <tt>GetLastError()</tt> around <tt>ffi.load()</tt> and symbol
122resolving, too.</li>
123<li>Improve ld script detection in <tt>ffi.load()</tt>.</li>
124<li>Record loads/stores to external variables in namespaces.</li>
125<li>Compile calls to stdcall, fastcall and vararg functions.</li>
126<li>Treat function ctypes like pointers in comparisons.</li>
127<li>Resolve <tt>__call</tt> metamethod for pointers, too.</li>
128<li>Record C function calls with bool return values.</li>
129<li>Record <tt>ffi.errno()</tt>.</li>
130<li>x86: Fix number to <tt>uint32_t</tt> conversion rounding.</li>
131<li>x86: Fix 64 bit arithmetic in assembler backend.</li>
132<li>x64: Fix struct-by-value calling conventions.</li>
133<li>ARM: Ensure invocation of SPLIT pass for float conversions.</li>
134</ul></li>
135<li>Structural and performance enhancements:
136<ul>
137<li>Display trace types with <tt>-jv</tt> and <tt>-jdump</tt>.</li>
138<li>Record isolated calls. But prefer recording loops over calls.</li>
139<li>Specialize to prototype for non-monomorphic functions. Solves the
140trace-explosion problem for closure-heavy programming styles.</li>
141<li>Always generate a portable <tt>vmdef.lua</tt>. Easier for distros.</li>
142</ul></li>
143</ul>
144
145<h2 id="LuaJIT-2.0.0-beta8">LuaJIT 2.0.0-beta8 &mdash; 2011-06-23</h2>
146<ul>
147<li>New features:
148<ul>
149<li>Soft-float ARM port of LuaJIT is complete.</li>
150<li>Add support for bytecode loading/saving and <tt>-b</tt> command line
151option.</li>
152<li>From Lua 5.2: <tt>__len</tt> metamethod for tables
153(disabled by default).</li>
154</ul></li>
155<li>Correctness and completeness:
156<ul>
157<li>ARM: Misc. fixes for interpreter.</li>
158<li>x86/x64: Fix <tt>bit.*</tt> argument checking in interpreter.</li>
159<li>Catch early out-of-memory in memory allocator initialization.</li>
160<li>Fix data-flow analysis for paths leading to an upvalue close.</li>
161<li>Fix check for missing arguments in <tt>string.format()</tt>.</li>
162<li>Fix Solaris/x86 build (note: not a supported target).</li>
163<li>Fix recording of loops with instable directions in side traces.</li>
164<li>x86/x64: Fix fusion of comparisons with <tt>u8</tt>/<tt>u16</tt>
165<tt>XLOAD</tt>.</li>
166<li>x86/x64: Fix register allocation for variable shifts.</li>
167</ul></li>
168<li>FFI library:
169<ul>
170<li>Add <tt>ffi.errno()</tt>. Save <tt>errno</tt>/<tt>GetLastError()</tt>
171around allocations etc.</li>
172<li>Fix <tt>__gc</tt> for VLA/VLS cdata objects.</li>
173<li>Fix recording of casts from 32 bit cdata pointers to integers.</li>
174<li><tt>tonumber(cdata)</tt> returns <tt>nil</tt> for non-numbers.</li>
175<li>Show address pointed to for <tt>tostring(pointer)</tt>.</li>
176<li>Print <tt>NULL</tt> pointers as <tt>"cdata&lt;... *&gt;: NULL"</tt>.</li>
177<li>Support <tt>__tostring</tt> metamethod for pointers to structs, too.</li>
178</ul></li>
179<li>Structural and performance enhancements:
180<ul>
181<li>More tuning for loop unrolling heuristics.</li>
182<li>Flatten and compress in-memory debug info (saves ~70%).</li>
183</ul></li>
184</ul>
185
186<h2 id="LuaJIT-2.0.0-beta7">LuaJIT 2.0.0-beta7 &mdash; 2011-05-05</h2>
187<ul>
188<li>New features:
189<ul>
190<li>ARM port of the LuaJIT interpreter is complete.</li>
191<li>FFI library: Add <tt>ffi.gc()</tt>, <tt>ffi.metatype()</tt>,
192<tt>ffi.istype()</tt>.</li>
193<li>FFI library: Resolve ld script redirection in <tt>ffi.load()</tt>.</li>
194<li>From Lua 5.2: <tt>package.searchpath()</tt>, <tt>fp:read("*L")</tt>,
195<tt>load(string)</tt>.</li>
196<li>From Lua 5.2, disabled by default: empty statement,
197<tt>table.unpack()</tt>, modified <tt>coroutine.running()</tt>.</li>
198</ul></li>
199<li>Correctness and completeness:
200<ul>
201<li>FFI library: numerous fixes.</li>
202<li>Fix type mismatches in store-to-load forwarding.</li>
203<li>Fix error handling within metamethods.</li>
204<li>Fix <tt>table.maxn()</tt>.</li>
205<li>Improve accuracy of <tt>x^-k</tt> on x64.</li>
206<li>Fix code generation for Intel Atom in x64 mode.</li>
207<li>Fix narrowing of POW.</li>
208<li>Fix recording of retried fast functions.</li>
209<li>Fix code generation for <tt>bit.bnot()</tt> and multiplies.</li>
210<li>Fix error location within cpcall frames.</li>
211<li>Add workaround for old libgcc unwind bug.</li>
212<li>Fix <tt>lua_yield()</tt> and <tt>getmetatable(lightuserdata)</tt> on x64.</li>
213<li>Misc. fixes for PPC/e500 interpreter.</li>
214<li>Fix stack slot updates for down-recursion.</li>
215</ul></li>
216<li>Structural and performance enhancements:
217<ul>
218<li>Add dual-number mode (int/double) for the VM. Enabled for ARM.</li>
219<li>Improve narrowing of arithmetic operators and <tt>for</tt> loops.</li>
220<li>Tune loop unrolling heuristics and increase trace recorder limits.</li>
221<li>Eliminate dead slots in snapshots using bytecode data-flow analysis.</li>
222<li>Avoid phantom stores to proxy tables.</li>
223<li>Optimize lookups in empty proxy tables.</li>
224<li>Improve bytecode optimization of <tt>and</tt>/<tt>or</tt> operators.</li>
225</ul></li>
226</ul>
227
228<h2 id="LuaJIT-2.0.0-beta6">LuaJIT 2.0.0-beta6 &mdash; 2011-02-11</h2>
229<ul>
230<li>New features:
231<ul>
232<li>PowerPC/e500v2 port of the LuaJIT interpreter is complete.</li>
233<li>Various minor features from Lua 5.2: Hex escapes in literals,
234<tt>'\*'</tt> escape, reversible <tt>string.format("%q",s)</tt>,
235<tt>"%g"</tt> pattern, <tt>table.sort</tt> checks callbacks,
236<tt>os.exit(status|true|false[,close])</tt>.</li>
237<li>Lua 5.2 <tt>__pairs</tt> and <tt>__ipairs</tt> metamethods
238(disabled by default).</li>
239<li>Initial release of the FFI library.</li>
240</ul></li>
241<li>Correctness and completeness:
242<ul>
243<li>Fix <tt>string.format()</tt> for non-finite numbers.</li>
244<li>Fix memory leak when compiled to use the built-in allocator.</li>
245<li>x86/x64: Fix unnecessary resize in <tt>TSETM</tt> bytecode.</li>
246<li>Fix various GC issues with traces and <tt>jit.flush()</tt>.</li>
247<li>x64: Fix fusion of indexes for array references.</li>
248<li>x86/x64: Fix stack overflow handling for coroutine results.</li>
249<li>Enable low-2GB memory allocation on FreeBSD/x64.</li>
250<li>Fix <tt>collectgarbage("count")</tt> result if more than 2GB is in use.</li>
251<li>Fix parsing of hex floats.</li>
252<li>x86/x64: Fix loop branch inversion with trailing
253<tt>HREF+NE/EQ</tt>.</li>
254<li>Add <tt>jit.os</tt> string.</li>
255<li><tt>coroutine.create()</tt> permits running C functions, too.</li>
256<li>Fix OSX build to work with newer ld64 versions.</li>
257<li>Fix bytecode optimization of <tt>and</tt>/<tt>or</tt> operators.</li>
258</ul></li>
259<li>Structural and performance enhancements:
260<ul>
261<li>Emit specialized bytecode for <tt>pairs()</tt>/<tt>next()</tt>.</li>
262<li>Improve bytecode coalescing of <tt>nil</tt> constants.</li>
263<li>Compile calls to vararg functions.</li>
264<li>Compile <tt>select()</tt>.</li>
265<li>Improve alias analysis, esp. for loads from allocations.</li>
266<li>Tuning of various compiler heuristics.</li>
267<li>Refactor and extend IR conversion instructions.</li>
268<li>x86/x64: Various backend enhancements related to the FFI.</li>
269<li>Add SPLIT pass to split 64 bit IR instructions for 32 bit CPUs.</li>
270</ul></li>
271</ul>
272
273<h2 id="LuaJIT-2.0.0-beta5">LuaJIT 2.0.0-beta5 &mdash; 2010-08-24</h2>
274<ul>
275<li>Correctness and completeness:
276<ul>
277<li>Fix trace exit dispatch to function headers.</li>
278<li>Fix Windows and OSX builds with LUAJIT_DISABLE_JIT.</li>
279<li>Reorganize and fix placement of generated machine code on x64.</li>
280<li>Fix TNEW in x64 interpreter.</li>
281<li>Do not eliminate PHIs for values only referenced from side exits.</li>
282<li>OS-independent canonicalization of strings for non-finite numbers.</li>
283<li>Fix <tt>string.char()</tt> range check on x64.</li>
284<li>Fix <tt>tostring()</tt> resolving within <tt>print()</tt>.</li>
285<li>Fix error handling for <tt>next()</tt>.</li>
286<li>Fix passing of constant arguments to external calls on x64.</li>
287<li>Fix interpreter argument check for two-argument SSE math functions.</li>
288<li>Fix C frame chain corruption caused by <tt>lua_cpcall()</tt>.</li>
289<li>Fix return from <tt>pcall()</tt> within active hook.</li>
290</ul></li>
291<li>Structural and performance enhancements:
292<ul>
293<li>Replace on-trace GC frame syncing with interpreter exit.</li>
294<li>Improve hash lookup specialization by not removing dead keys during GC.</li>
295<li>Turn traces into true GC objects.</li>
296<li>Avoid starting a GC cycle immediately after library init.</li>
297<li>Add weak guards to improve dead-code elimination.</li>
298<li>Speed up string interning.</li>
299</ul></li>
300</ul>
301
302<h2 id="LuaJIT-2.0.0-beta4">LuaJIT 2.0.0-beta4 &mdash; 2010-03-28</h2>
303<ul>
304<li>Correctness and completeness:
305<ul>
306<li>Fix precondition for on-trace creation of table keys.</li>
307<li>Fix <tt>{f()}</tt> on x64 when table is resized.</li>
308<li>Fix folding of ordered comparisons with same references.</li>
309<li>Fix snapshot restores for multi-result bytecodes.</li>
310<li>Fix potential hang when recording bytecode with nested closures.</li>
311<li>Fix recording of <tt>getmetatable()</tt>, <tt>tonumber()</tt> and bad argument types.</li>
312<li>Fix SLOAD fusion across returns to lower frames.</li>
313</ul></li>
314<li>Structural and performance enhancements:
315<ul>
316<li>Add array bounds check elimination. <tt>-Oabc</tt> is enabled by default.</li>
317<li>More tuning for x64, e.g. smaller table objects.</li>
318</ul></li>
319</ul>
320
321<h2 id="LuaJIT-2.0.0-beta3">LuaJIT 2.0.0-beta3 &mdash; 2010-03-07</h2>
322<ul>
323<li>LuaJIT x64 port:
324<ul>
325<li>Port integrated memory allocator to Linux/x64, Windows/x64 and OSX/x64.</li>
326<li>Port interpreter and JIT compiler to x64.</li>
327<li>Port DynASM to x64.</li>
328<li>Many 32/64 bit cleanups in the VM.</li>
329<li>Allow building the interpreter with either x87 or SSE2 arithmetics.</li>
330<li>Add external unwinding and C++ exception interop (default on x64).</li>
331</ul></li>
332<li>Correctness and completeness:
333<ul>
334<li>Fix constructor bytecode generation for certain conditional values.</li>
335<li>Fix some cases of ordered string comparisons.</li>
336<li>Fix <tt>lua_tocfunction()</tt>.</li>
337<li>Fix cutoff register in JMP bytecode for some conditional expressions.</li>
338<li>Fix PHI marking algorithm for references from variant slots.</li>
339<li>Fix <tt>package.cpath</tt> for non-default PREFIX.</li>
340<li>Fix DWARF2 frame unwind information for interpreter on OSX.</li>
341<li>Drive the GC forward on string allocations in the parser.</li>
342<li>Implement call/return hooks (zero-cost if disabled).</li>
343<li>Implement yield from C hooks.</li>
344<li>Disable JIT compiler on older non-SSE2 CPUs instead of aborting.</li>
345</ul></li>
346<li>Structural and performance enhancements:
347<ul>
348<li>Compile recursive code (tail-, up- and down-recursion).</li>
349<li>Improve heuristics for bytecode penalties and blacklisting.</li>
350<li>Split CALL/FUNC recording and clean up fast function call semantics.</li>
351<li>Major redesign of internal function call handling.</li>
352<li>Improve FOR loop const specialization and integerness checks.</li>
353<li>Switch to pre-initialized stacks. Avoid frame-clearing.</li>
354<li>Colocation of prototypes and related data: bytecode, constants, debug info.</li>
355<li>Cleanup parser and streamline bytecode generation.</li>
356<li>Add support for weak IR references to register allocator.</li>
357<li>Switch to compressed, extensible snapshots.</li>
358<li>Compile returns to frames below the start frame.</li>
359<li>Improve alias analysis of upvalues using a disambiguation hash value.</li>
360<li>Compile floor/ceil/trunc to SSE2 helper calls or SSE4.1 instructions.</li>
361<li>Add generic C call handling to IR and backend.</li>
362<li>Improve KNUM fuse vs. load heuristics.</li>
363<li>Compile various <tt>io.*()</tt> functions.</li>
364<li>Compile <tt>math.sinh()</tt>, <tt>math.cosh()</tt>, <tt>math.tanh()</tt>
365and <tt>math.random()</tt>.</li>
366</ul></li>
367</ul>
368
369<h2 id="LuaJIT-2.0.0-beta2">LuaJIT 2.0.0-beta2 &mdash; 2009-11-09</h2>
370<ul>
371<li>Reorganize build system. Build static+shared library on POSIX.</li>
372<li>Allow C++ exception conversion on all platforms
373using a wrapper function.</li>
374<li>Automatically catch C++ exceptions and rethrow Lua error
375(DWARF2 only).</li>
376<li>Check for the correct x87 FPU precision at strategic points.</li>
377<li>Always use wrappers for libm functions.</li>
378<li>Resurrect metamethod name strings before copying them.</li>
379<li>Mark current trace, even if compiler is idle.</li>
380<li>Ensure FILE metatable is created only once.</li>
381<li>Fix type comparisons when different integer types are involved.</li>
382<li>Fix <tt>getmetatable()</tt> recording.</li>
383<li>Fix TDUP with dead keys in template table.</li>
384<li><tt>jit.flush(tr)</tt> returns status.
385Prevent manual flush of a trace that's still linked.</li>
386<li>Improve register allocation heuristics for invariant references.</li>
387<li>Compile the push/pop variants of <tt>table.insert()</tt> and
388<tt>table.remove()</tt>.</li>
389<li>Compatibility with MSVC <tt>link&nbsp/debug</tt>.</li>
390<li>Fix <tt>lua_iscfunction()</tt>.</li>
391<li>Fix <tt>math.random()</tt> when compiled with <tt>-fpic</tt> (OSX).</li>
392<li>Fix <tt>table.maxn()</tt>.</li>
393<li>Bump <tt>MACOSX_DEPLOYMENT_TARGET</tt> to <tt>10.4</tt></li>
394<li><tt>luaL_check*()</tt> and <tt>luaL_opt*()</tt> now support
395negative arguments, too.<br>
396This matches the behavior of Lua 5.1, but not the specification.</li>
397</ul>
398
399<h2 id="LuaJIT-2.0.0-beta1">LuaJIT 2.0.0-beta1 &mdash; 2009-10-31</h2>
400<ul>
401<li>This is the first public release of LuaJIT 2.0.</li>
402<li>The whole VM has been rewritten from the ground up, so there's
403no point in listing differences over earlier versions.</li>
404</ul>
405</div>
406
407<div class="major" style="background: #d0d0ff;">
408<h2 id="LuaJIT-1.1.7">LuaJIT 1.1.7 &mdash; 2011-05-05</h2>
409<ul>
410<li>Added fixes for the
411<a href="http://www.lua.org/bugs.html#5.1.4"><span class="ext">&raquo;</span>&nbsp;currently known bugs in Lua 5.1.4</a>.</li>
412</ul>
413
414<h2 id="LuaJIT-1.1.6">LuaJIT 1.1.6 &mdash; 2010-03-28</h2>
415<ul>
416<li>Added fixes for the
417<a href="http://www.lua.org/bugs.html#5.1.4"><span class="ext">&raquo;</span>&nbsp;currently known bugs in Lua 5.1.4</a>.</li>
418<li>Removed wrong GC check in <tt>jit_createstate()</tt>.
419Thanks to Tim Mensch.</li>
420<li>Fixed bad assertions while compiling <tt>table.insert()</tt> and
421<tt>table.remove()</tt>.</li>
422</ul>
423
424<h2 id="LuaJIT-1.1.5">LuaJIT 1.1.5 &mdash; 2008-10-25</h2>
425<ul>
426<li>Merged with Lua 5.1.4. Fixes all
427<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>
428</ul>
429
430<h2 id="LuaJIT-1.1.4">LuaJIT 1.1.4 &mdash; 2008-02-05</h2>
431<ul>
432<li>Merged with Lua 5.1.3. Fixes all
433<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>
434<li>Fixed possible (but unlikely) stack corruption while compiling
435<tt>k^x</tt> expressions.</li>
436<li>Fixed DynASM template for cmpss instruction.</li>
437</ul>
438
439<h2 id="LuaJIT-1.1.3">LuaJIT 1.1.3 &mdash; 2007-05-24</h2>
440<ul>
441<li>Merged with Lua 5.1.2. Fixes all
442<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>
443<li>Merged pending Lua 5.1.x fixes: "return -nil" bug, spurious count hook call.</li>
444<li>Remove a (sometimes) wrong assertion in <tt>luaJIT_findpc()</tt>.</li>
445<li>DynASM now allows labels for displacements and <tt>.aword</tt>.</li>
446<li>Fix some compiler warnings for DynASM glue (internal API change).</li>
447<li>Correct naming for SSSE3 (temporarily known as SSE4) in DynASM and x86 disassembler.</li>
448<li>The loadable debug modules now handle redirection to stdout
449(e.g. <tt>-j&nbsp;trace=-</tt>).</li>
450</ul>
451
452<h2 id="LuaJIT-1.1.2">LuaJIT 1.1.2 &mdash; 2006-06-24</h2>
453<ul>
454<li>Fix MSVC inline assembly: use only local variables with
455<tt>lua_number2int()</tt>.</li>
456<li>Fix "attempt to call a thread value" bug on Mac OS X:
457make values of consts used as lightuserdata keys unique
458to avoid joining by the compiler/linker.</li>
459</ul>
460
461<h2 id="LuaJIT-1.1.1">LuaJIT 1.1.1 &mdash; 2006-06-20</h2>
462<ul>
463<li>Merged with Lua 5.1.1. Fixes all
464<a href="http://www.lua.org/bugs.html#5.1"><span class="ext">&raquo;</span>&nbsp;known bugs in Lua 5.1</a>.</li>
465<li>Enforce (dynamic) linker error for EXE/DLL version mismatches.</li>
466<li>Minor changes to DynASM: faster pre-processing, smaller encoding
467for some immediates.</li>
468</ul>
469<p>
470This release is in sync with Coco 1.1.1 (see the
471<a href="http://coco.luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Coco Change History</a>).
472</p>
473
474<h2 id="LuaJIT-1.1.0">LuaJIT 1.1.0 &mdash; 2006-03-13</h2>
475<ul>
476<li>Merged with Lua 5.1 (final).</li>
477
478<li>New JIT call frame setup:
479<ul>
480<li>The C stack is kept 16 byte aligned (faster).
481Mandatory for Mac OS X on Intel, too.</li>
482<li>Faster calling conventions for internal C helper functions.</li>
483<li>Better instruction scheduling for function prologue, OP_CALL and
484OP_RETURN.</li>
485</ul></li>
486
487<li>Miscellaneous optimizations:
488<ul>
489<li>Faster loads of FP constants. Remove narrow-to-wide store-to-load
490forwarding stalls.</li>
491<li>Use (scalar) SSE2 ops (if the CPU supports it) to speed up slot moves
492and FP to integer conversions.</li>
493<li>Optimized the two-argument form of <tt>OP_CONCAT</tt> (<tt>a..b</tt>).</li>
494<li>Inlined <tt>OP_MOD</tt> (<tt>a%b</tt>).
495With better accuracy than the C variant, too.</li>
496<li>Inlined <tt>OP_POW</tt> (<tt>a^b</tt>). Unroll <tt>x^k</tt> or
497use <tt>k^x = 2^(log2(k)*x)</tt> or call <tt>pow()</tt>.</li>
498</ul></li>
499
500<li>Changes in the optimizer:
501<ul>
502<li>Improved hinting for table keys derived from table values
503(<tt>t1[t2[x]]</tt>).</li>
504<li>Lookup hinting now works with arbitrary object types and
505supports index chains, too.</li>
506<li>Generate type hints for arithmetic and comparison operators,
507OP_LEN, OP_CONCAT and OP_FORPREP.</li>
508<li>Remove several hint definitions in favour of a generic COMBINE hint.</li>
509<li>Complete rewrite of <tt>jit.opt_inline</tt> module
510(ex <tt>jit.opt_lib</tt>).</li>
511</ul></li>
512
513<li>Use adaptive deoptimization:
514<ul>
515<li>If runtime verification of a contract fails, the affected
516instruction is recompiled and patched on-the-fly.
517Regular programs will trigger deoptimization only occasionally.</li>
518<li>This avoids generating code for uncommon fallback cases
519most of the time. Generated code is up to 30% smaller compared to
520LuaJIT&nbsp;1.0.3.</li>
521<li>Deoptimization is used for many opcodes and contracts:
522<ul>
523<li>OP_CALL, OP_TAILCALL: type mismatch for callable.</li>
524<li>Inlined calls: closure mismatch, parameter number and type mismatches.</li>
525<li>OP_GETTABLE, OP_SETTABLE: table or key type and range mismatches.</li>
526<li>All arithmetic and comparison operators, OP_LEN, OP_CONCAT,
527OP_FORPREP: operand type and range mismatches.</li>
528</ul></li>
529<li>Complete redesign of the debug and traceback info
530(bytecode &harr; mcode) to support deoptimization.
531Much more flexible and needs only 50% of the space.</li>
532<li>The modules <tt>jit.trace</tt>, <tt>jit.dumphints</tt> and
533<tt>jit.dump</tt> handle deoptimization.</li>
534</ul></li>
535
536<li>Inlined many popular library functions
537(for commonly used arguments only):
538<ul>
539<li>Most <tt>math.*</tt> functions (the 18 most used ones)
540[2x-10x faster].</li>
541<li><tt>string.len</tt>, <tt>string.sub</tt> and <tt>string.char</tt>
542[2x-10x faster].</li>
543<li><tt>table.insert</tt>, <tt>table.remove</tt> and <tt>table.getn</tt>
544[3x-5x faster].</li>
545<li><tt>coroutine.yield</tt> and <tt>coroutine.resume</tt>
546[3x-5x faster].</li>
547<li><tt>pairs</tt>, <tt>ipairs</tt> and the corresponding iterators
548[8x-15x faster].</li>
549</ul></li>
550
551<li>Changes in the core and loadable modules and the stand-alone executable:
552<ul>
553<li>Added <tt>jit.version</tt>, <tt>jit.version_num</tt>
554and <tt>jit.arch</tt>.</li>
555<li>Reorganized some internal API functions (<tt>jit.util.*mcode*</tt>).</li>
556<li>The <tt>-j dump</tt> output now shows JSUB names, too.</li>
557<li>New x86 disassembler module written in pure Lua. No dependency
558on ndisasm anymore. Flexible API, very compact (500 lines)
559and complete (x87, MMX, SSE, SSE2, SSE3, SSSE3, privileged instructions).</li>
560<li><tt>luajit -v</tt> prints the LuaJIT version and copyright
561on a separate line.</li>
562</ul></li>
563
564<li>Added SSE, SSE2, SSE3 and SSSE3 support to DynASM.</li>
565<li>Miscellaneous doc changes. Added a section about
566<a href="install.html#embedding">embedding LuaJIT</a>.</li>
567</ul>
568<p>
569This release is in sync with Coco 1.1.0 (see the
570<a href="http://coco.luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Coco Change History</a>).
571</p>
572</div>
573
574<div class="major" style="background: #ffffd0;">
575<h2 id="LuaJIT-1.0.3">LuaJIT 1.0.3 &mdash; 2005-09-08</h2>
576<ul>
577<li>Even more docs.</li>
578<li>Unified closure checks in <tt>jit.*</tt>.</li>
579<li>Fixed some range checks in <tt>jit.util.*</tt>.</li>
580<li>Fixed __newindex call originating from <tt>jit_settable_str()</tt>.</li>
581<li>Merged with Lua 5.1 alpha (including early bug fixes).</li>
582</ul>
583<p>
584This is the first public release of LuaJIT.
585</p>
586
587<h2 id="LuaJIT-1.0.2">LuaJIT 1.0.2 &mdash; 2005-09-02</h2>
588<ul>
589<li>Add support for flushing the Valgrind translation cache <br>
590(<tt>MYCFLAGS= -DUSE_VALGRIND</tt>).</li>
591<li>Add support for freeing executable mcode memory to the <tt>mmap()</tt>-based
592variant for POSIX systems.</li>
593<li>Reorganized the C&nbsp;function signature handling in
594<tt>jit.opt_lib</tt>.</li>
595<li>Changed to index-based hints for inlining C&nbsp;functions.
596Still no support in the backend for inlining.</li>
597<li>Hardcode <tt>HEAP_CREATE_ENABLE_EXECUTE</tt> value if undefined.</li>
598<li>Misc. changes to the <tt>jit.*</tt> modules.</li>
599<li>Misc. changes to the Makefiles.</li>
600<li>Lots of new docs.</li>
601<li>Complete doc reorg.</li>
602</ul>
603<p>
604Not released because Lua 5.1 alpha came out today.
605</p>
606
607<h2 id="LuaJIT-1.0.1">LuaJIT 1.0.1 &mdash; 2005-08-31</h2>
608<ul>
609<li>Missing GC step in <tt>OP_CONCAT</tt>.</li>
610<li>Fix result handling for C &ndash;> JIT calls.</li>
611<li>Detect CPU feature bits.</li>
612<li>Encode conditional moves (<tt>fucomip</tt>) only when supported.</li>
613<li>Add fallback instructions for FP compares.</li>
614<li>Add support for <tt>LUA_COMPAT_VARARG</tt>. Still disabled by default.</li>
615<li>MSVC needs a specific place for the <tt>CALLBACK</tt> attribute
616(David Burgess).</li>
617<li>Misc. doc updates.</li>
618</ul>
619<p>
620Interim non-public release.
621Special thanks to Adam D. Moss for reporting most of the bugs.
622</p>
623
624<h2 id="LuaJIT-1.0.0">LuaJIT 1.0.0 &mdash; 2005-08-29</h2>
625<p>
626This is the initial non-public release of LuaJIT.
627</p>
628</div>
629<br class="flush">
630</div>
631<div id="foot">
632<hr class="hide">
633Copyright &copy; 2005-2011 Mike Pall
634<span class="noprint">
635&middot;
636<a href="contact.html">Contact</a>
637</span>
638</div>
639</body>
640</html>
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