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44<a href="ext_jit.html">jit.* Library</a> 44<a href="ext_jit.html">jit.* Library</a>
45</li><li> 45</li><li>
46<a href="ext_c_api.html">Lua/C API</a> 46<a href="ext_c_api.html">Lua/C API</a>
47</li><li>
48<a href="ext_profiler.html">Profiler</a>
47</li></ul> 49</li></ul>
48</li><li> 50</li><li>
49<a href="status.html">Status</a> 51<a href="status.html">Status</a>
@@ -72,6 +74,60 @@ to see whether newer versions are available.
72</p> 74</p>
73 75
74<div class="major" style="background: #d0d0ff;"> 76<div class="major" style="background: #d0d0ff;">
77<h2 id="LuaJIT-2.1.0-beta1">LuaJIT 2.1.0-beta1 &mdash; 2015-08-25</h2>
78<p>
79This is a brief summary of the major changes in LuaJIT 2.1 compared to 2.0.
80Please take a look at the commit history for more details.
81</p>
82<ul>
83<li>Changes to the VM core:
84<ul>
85<li>Add low-overhead profiler (<tt>-jp</tt>).</li>
86<li>Add <tt>LJ_GC64</tt> mode: 64 bit GC object references (really: 47 bit). Interpreter-only for now.</li>
87<li>Add <tt>LJ_FR2</tt> mode: Two-slot frame info. Required by <tt>LJ_GC64</tt> mode.</li>
88<li>Add <tt>table.new()</tt> and <tt>table.clear()</tt>.</li>
89<li>Parse Unicode escape <tt>'\u{XX...}'</tt> in string literals.</li>
90<li>Parse binary number literals (<tt>0bxxx</tt>).</li>
91</ul></li>
92<li>Improvements to the JIT compiler:
93<ul>
94<li>Add trace stitching.</li>
95<li>Compile various builtins: <tt>string.char()</tt>, <tt>string.reverse()</tt>, <tt>string.lower()</tt>, <tt>string.upper()</tt>, <tt>string.rep()</tt>, <tt>string.format()</tt>, <tt>table.concat()</tt>, <tt>bit.tohex()</tt>, <tt>getfenv(0)</tt>, <tt>debug.getmetatable()</tt>.</li>
96<li>Compile <tt>string.find()</tt> for fixed string searches (no patterns).</li>
97<li>Compile <tt>BC_TSETM</tt>, e.g. <tt>{1,2,3,f()}</tt>.</li>
98<li>Compile string concatenations (<tt>BC_CAT</tt>).</li>
99<li>Compile <tt>__concat</tt> metamethod.</li>
100<li>Various minor optimizations.</li>
101</ul></li>
102<li>Internal Changes:
103<ul>
104<li>Add support for embedding LuaJIT bytecode for builtins.</li>
105<li>Replace various builtins with embedded bytecode.</li>
106<li>Refactor string buffers and string formatting.</li>
107<li>Remove obsolete non-truncating number to integer conversions.</li>
108</ul></li>
109<li>Ports:
110<ul>
111<li>Add Xbox One port (<tt>LJ_GC64</tt> mode).</li>
112<li>ARM64: Add port of the interpreter (<tt>LJ_GC64</tt> mode).</li>
113<li>x64: Add separate port of the interpreter to <tt>LJ_GC64</tt> mode.</li>
114<li>x86/x64: Drop internal x87 math functions. Use libm functions.</li>
115<li>x86: Remove x87 support from interpreter. SSE2 is mandatory now.</li>
116<li>PPC/e500: Drop support for this architecture.</li>
117</ul></li>
118<li>FFI library:
119<ul>
120<li>FFI: Add 64 bit bitwise operations.</li>
121<li>FFI: Compile VLA/VLS and large cdata allocations with default initialization.</li>
122<li>FFI: Compile conversions from functions to function pointers.</li>
123<li>FFI: Compile lightuserdata to <tt>void *</tt> conversion.</li>
124<li>FFI: Compile <tt>ffi.gc(cdata, nil)</tt>, too.</li>
125<li>FFI: Add <tt>ffi.typeinfo()</tt>.</li>
126</ul></li>
127</ul>
128</div>
129
130<div class="major" style="background: #ffffd0;">
75<h2 id="LuaJIT-2.0.4">LuaJIT 2.0.4 &mdash; 2015-05-14</h2> 131<h2 id="LuaJIT-2.0.4">LuaJIT 2.0.4 &mdash; 2015-05-14</h2>
76<ul> 132<ul>
77<li>Fix stack check in narrowing optimization.</li> 133<li>Fix stack check in narrowing optimization.</li>
@@ -735,235 +791,6 @@ This matches the behavior of Lua 5.1, but not the specification.</li>
735no point in listing differences over earlier versions.</li> 791no point in listing differences over earlier versions.</li>
736</ul> 792</ul>
737</div> 793</div>
738
739<div class="major" style="background: #ffff80;">
740<h2 id="LuaJIT-1.1.8">LuaJIT 1.1.8 &mdash; 2012-04-16</h2>
741<ul>
742<li>Merged with Lua 5.1.5. Also integrated fixes for all
743<a href="http://www.lua.org/bugs.html#5.1.5"><span class="ext">&raquo;</span>&nbsp;<span class="ext">&raquo;</span>&nbsp;currently known bugs in Lua 5.1.5</a>.</li>
744</ul>
745
746<h2 id="LuaJIT-1.1.7">LuaJIT 1.1.7 &mdash; 2011-05-05</h2>
747<ul>
748<li>Added fixes for the
749<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>
750</ul>
751
752<h2 id="LuaJIT-1.1.6">LuaJIT 1.1.6 &mdash; 2010-03-28</h2>
753<ul>
754<li>Added fixes for the
755<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>
756<li>Removed wrong GC check in <tt>jit_createstate()</tt>.
757Thanks to Tim Mensch.</li>
758<li>Fixed bad assertions while compiling <tt>table.insert()</tt> and
759<tt>table.remove()</tt>.</li>
760</ul>
761
762<h2 id="LuaJIT-1.1.5">LuaJIT 1.1.5 &mdash; 2008-10-25</h2>
763<ul>
764<li>Merged with Lua 5.1.4. Fixes all
765<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>
766</ul>
767
768<h2 id="LuaJIT-1.1.4">LuaJIT 1.1.4 &mdash; 2008-02-05</h2>
769<ul>
770<li>Merged with Lua 5.1.3. Fixes all
771<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>
772<li>Fixed possible (but unlikely) stack corruption while compiling
773<tt>k^x</tt> expressions.</li>
774<li>Fixed DynASM template for cmpss instruction.</li>
775</ul>
776
777<h2 id="LuaJIT-1.1.3">LuaJIT 1.1.3 &mdash; 2007-05-24</h2>
778<ul>
779<li>Merged with Lua 5.1.2. Fixes all
780<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>
781<li>Merged pending Lua 5.1.x fixes: "return -nil" bug, spurious count hook call.</li>
782<li>Remove a (sometimes) wrong assertion in <tt>luaJIT_findpc()</tt>.</li>
783<li>DynASM now allows labels for displacements and <tt>.aword</tt>.</li>
784<li>Fix some compiler warnings for DynASM glue (internal API change).</li>
785<li>Correct naming for SSSE3 (temporarily known as SSE4) in DynASM and x86 disassembler.</li>
786<li>The loadable debug modules now handle redirection to stdout
787(e.g. <tt>-j&nbsp;trace=-</tt>).</li>
788</ul>
789
790<h2 id="LuaJIT-1.1.2">LuaJIT 1.1.2 &mdash; 2006-06-24</h2>
791<ul>
792<li>Fix MSVC inline assembly: use only local variables with
793<tt>lua_number2int()</tt>.</li>
794<li>Fix "attempt to call a thread value" bug on Mac OS X:
795make values of consts used as lightuserdata keys unique
796to avoid joining by the compiler/linker.</li>
797</ul>
798
799<h2 id="LuaJIT-1.1.1">LuaJIT 1.1.1 &mdash; 2006-06-20</h2>
800<ul>
801<li>Merged with Lua 5.1.1. Fixes all
802<a href="http://www.lua.org/bugs.html#5.1"><span class="ext">&raquo;</span>&nbsp;known bugs in Lua 5.1</a>.</li>
803<li>Enforce (dynamic) linker error for EXE/DLL version mismatches.</li>
804<li>Minor changes to DynASM: faster pre-processing, smaller encoding
805for some immediates.</li>
806</ul>
807<p>
808This release is in sync with Coco 1.1.1 (see the
809<a href="http://coco.luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Coco Change History</a>).
810</p>
811
812<h2 id="LuaJIT-1.1.0">LuaJIT 1.1.0 &mdash; 2006-03-13</h2>
813<ul>
814<li>Merged with Lua 5.1 (final).</li>
815
816<li>New JIT call frame setup:
817<ul>
818<li>The C stack is kept 16 byte aligned (faster).
819Mandatory for Mac OS X on Intel, too.</li>
820<li>Faster calling conventions for internal C helper functions.</li>
821<li>Better instruction scheduling for function prologue, OP_CALL and
822OP_RETURN.</li>
823</ul></li>
824
825<li>Miscellaneous optimizations:
826<ul>
827<li>Faster loads of FP constants. Remove narrow-to-wide store-to-load
828forwarding stalls.</li>
829<li>Use (scalar) SSE2 ops (if the CPU supports it) to speed up slot moves
830and FP to integer conversions.</li>
831<li>Optimized the two-argument form of <tt>OP_CONCAT</tt> (<tt>a..b</tt>).</li>
832<li>Inlined <tt>OP_MOD</tt> (<tt>a%b</tt>).
833With better accuracy than the C variant, too.</li>
834<li>Inlined <tt>OP_POW</tt> (<tt>a^b</tt>). Unroll <tt>x^k</tt> or
835use <tt>k^x = 2^(log2(k)*x)</tt> or call <tt>pow()</tt>.</li>
836</ul></li>
837
838<li>Changes in the optimizer:
839<ul>
840<li>Improved hinting for table keys derived from table values
841(<tt>t1[t2[x]]</tt>).</li>
842<li>Lookup hinting now works with arbitrary object types and
843supports index chains, too.</li>
844<li>Generate type hints for arithmetic and comparison operators,
845OP_LEN, OP_CONCAT and OP_FORPREP.</li>
846<li>Remove several hint definitions in favour of a generic COMBINE hint.</li>
847<li>Complete rewrite of <tt>jit.opt_inline</tt> module
848(ex <tt>jit.opt_lib</tt>).</li>
849</ul></li>
850
851<li>Use adaptive deoptimization:
852<ul>
853<li>If runtime verification of a contract fails, the affected
854instruction is recompiled and patched on-the-fly.
855Regular programs will trigger deoptimization only occasionally.</li>
856<li>This avoids generating code for uncommon fallback cases
857most of the time. Generated code is up to 30% smaller compared to
858LuaJIT&nbsp;1.0.3.</li>
859<li>Deoptimization is used for many opcodes and contracts:
860<ul>
861<li>OP_CALL, OP_TAILCALL: type mismatch for callable.</li>
862<li>Inlined calls: closure mismatch, parameter number and type mismatches.</li>
863<li>OP_GETTABLE, OP_SETTABLE: table or key type and range mismatches.</li>
864<li>All arithmetic and comparison operators, OP_LEN, OP_CONCAT,
865OP_FORPREP: operand type and range mismatches.</li>
866</ul></li>
867<li>Complete redesign of the debug and traceback info
868(bytecode &harr; mcode) to support deoptimization.
869Much more flexible and needs only 50% of the space.</li>
870<li>The modules <tt>jit.trace</tt>, <tt>jit.dumphints</tt> and
871<tt>jit.dump</tt> handle deoptimization.</li>
872</ul></li>
873
874<li>Inlined many popular library functions
875(for commonly used arguments only):
876<ul>
877<li>Most <tt>math.*</tt> functions (the 18 most used ones)
878[2x-10x faster].</li>
879<li><tt>string.len</tt>, <tt>string.sub</tt> and <tt>string.char</tt>
880[2x-10x faster].</li>
881<li><tt>table.insert</tt>, <tt>table.remove</tt> and <tt>table.getn</tt>
882[3x-5x faster].</li>
883<li><tt>coroutine.yield</tt> and <tt>coroutine.resume</tt>
884[3x-5x faster].</li>
885<li><tt>pairs</tt>, <tt>ipairs</tt> and the corresponding iterators
886[8x-15x faster].</li>
887</ul></li>
888
889<li>Changes in the core and loadable modules and the stand-alone executable:
890<ul>
891<li>Added <tt>jit.version</tt>, <tt>jit.version_num</tt>
892and <tt>jit.arch</tt>.</li>
893<li>Reorganized some internal API functions (<tt>jit.util.*mcode*</tt>).</li>
894<li>The <tt>-j dump</tt> output now shows JSUB names, too.</li>
895<li>New x86 disassembler module written in pure Lua. No dependency
896on ndisasm anymore. Flexible API, very compact (500 lines)
897and complete (x87, MMX, SSE, SSE2, SSE3, SSSE3, privileged instructions).</li>
898<li><tt>luajit -v</tt> prints the LuaJIT version and copyright
899on a separate line.</li>
900</ul></li>
901
902<li>Added SSE, SSE2, SSE3 and SSSE3 support to DynASM.</li>
903<li>Miscellaneous doc changes. Added a section about
904<a href="install.html#embedding">embedding LuaJIT</a>.</li>
905</ul>
906<p>
907This release is in sync with Coco 1.1.0 (see the
908<a href="http://coco.luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Coco Change History</a>).
909</p>
910</div>
911
912<div class="major" style="background: #ffffd0;">
913<h2 id="LuaJIT-1.0.3">LuaJIT 1.0.3 &mdash; 2005-09-08</h2>
914<ul>
915<li>Even more docs.</li>
916<li>Unified closure checks in <tt>jit.*</tt>.</li>
917<li>Fixed some range checks in <tt>jit.util.*</tt>.</li>
918<li>Fixed __newindex call originating from <tt>jit_settable_str()</tt>.</li>
919<li>Merged with Lua 5.1 alpha (including early bug fixes).</li>
920</ul>
921<p>
922This is the first public release of LuaJIT.
923</p>
924
925<h2 id="LuaJIT-1.0.2">LuaJIT 1.0.2 &mdash; 2005-09-02</h2>
926<ul>
927<li>Add support for flushing the Valgrind translation cache <br>
928(<tt>MYCFLAGS= -DUSE_VALGRIND</tt>).</li>
929<li>Add support for freeing executable mcode memory to the <tt>mmap()</tt>-based
930variant for POSIX systems.</li>
931<li>Reorganized the C&nbsp;function signature handling in
932<tt>jit.opt_lib</tt>.</li>
933<li>Changed to index-based hints for inlining C&nbsp;functions.
934Still no support in the backend for inlining.</li>
935<li>Hardcode <tt>HEAP_CREATE_ENABLE_EXECUTE</tt> value if undefined.</li>
936<li>Misc. changes to the <tt>jit.*</tt> modules.</li>
937<li>Misc. changes to the Makefiles.</li>
938<li>Lots of new docs.</li>
939<li>Complete doc reorg.</li>
940</ul>
941<p>
942Not released because Lua 5.1 alpha came out today.
943</p>
944
945<h2 id="LuaJIT-1.0.1">LuaJIT 1.0.1 &mdash; 2005-08-31</h2>
946<ul>
947<li>Missing GC step in <tt>OP_CONCAT</tt>.</li>
948<li>Fix result handling for C &ndash;> JIT calls.</li>
949<li>Detect CPU feature bits.</li>
950<li>Encode conditional moves (<tt>fucomip</tt>) only when supported.</li>
951<li>Add fallback instructions for FP compares.</li>
952<li>Add support for <tt>LUA_COMPAT_VARARG</tt>. Still disabled by default.</li>
953<li>MSVC needs a specific place for the <tt>CALLBACK</tt> attribute
954(David Burgess).</li>
955<li>Misc. doc updates.</li>
956</ul>
957<p>
958Interim non-public release.
959Special thanks to Adam D. Moss for reporting most of the bugs.
960</p>
961
962<h2 id="LuaJIT-1.0.0">LuaJIT 1.0.0 &mdash; 2005-08-29</h2>
963<p>
964This is the initial non-public release of LuaJIT.
965</p>
966</div>
967<br class="flush"> 794<br class="flush">
968</div> 795</div>
969<div id="foot"> 796<div id="foot">
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