source/libs/luajit/LuaJIT-src/doc/changes.html

   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) 2005-2015, 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 <style type="text/css">
  12 div.major { max-width: 600px; padding: 1em; margin: 1em 0 1em 0; }
  13 </style>
  14 </head>
  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="http://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
  27 </li><li>
  28 <a href="install.html">Installation</a>
  29 </li><li>
  30 <a href="running.html">Running</a>
  31 </li></ul>
  32 </li><li>
  33 <a href="extensions.html">Extensions</a>
  34 <ul><li>
  35 <a href="ext_ffi.html">FFI Library</a>
  36 <ul><li>
  37 <a href="ext_ffi_tutorial.html">FFI Tutorial</a>
  38 </li><li>
  39 <a href="ext_ffi_api.html">ffi.* API</a>
  40 </li><li>
  41 <a href="ext_ffi_semantics.html">FFI Semantics</a>
  42 </li></ul>
  43 </li><li>
  44 <a href="ext_jit.html">jit.* Library</a>
  45 </li><li>
  46 <a href="ext_c_api.html">Lua/C API</a>
  47 </li><li>
  48 <a href="ext_profiler.html">Profiler</a>
  49 </li></ul>
  50 </li><li>
  51 <a href="status.html">Status</a>
  52 <ul><li>
  53 <a class="current" href="changes.html">Changes</a>
  54 </li></ul>
  55 </li><li>
  56 <a href="faq.html">FAQ</a>
  57 </li><li>
  58 <a href="http://luajit.org/performance.html">Performance <span class="ext">&raquo;</span></a>
  59 </li><li>
  60 <a href="http://wiki.luajit.org/">Wiki <span class="ext">&raquo;</span></a>
  61 </li><li>
  62 <a href="http://luajit.org/list.html">Mailing List <span class="ext">&raquo;</span></a>
  63 </li></ul>
  64 </div>
  65 <div id="main">
  66 <p>
  67 This is a list of changes between the released versions of LuaJIT.<br>
  68 The current <span style="color: #0000c0;">stable version</span> is <strong>LuaJIT&nbsp;2.0.4</strong>.<br>
  69 </p>
  70 <p>
  71 Please check the
  72 <a href="http://luajit.org/changes.html"><span class="ext">&raquo;</span>&nbsp;Online Change History</a>
  73 to see whether newer versions are available.
  74 </p>
  75
  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>
  79 This is a brief summary of the major changes in LuaJIT 2.1 compared to 2.0.
  80 Please 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 binary number literals (<tt>0bxxx</tt>).</li>
  90 </ul></li>
  91 <li>Improvements to the JIT compiler:
  92 <ul>
  93 <li>Add trace stitching (disabled for now).</li>
  94 <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>
  95 <li>Compile <tt>string.find()</tt> for fixed string searches (no patterns).</li>
  96 <li>Compile <tt>BC_TSETM</tt>, e.g. <tt>{1,2,3,f()}</tt>.</li>
  97 <li>Compile string concatenations (<tt>BC_CAT</tt>).</li>
  98 <li>Compile <tt>__concat</tt> metamethod.</li>
  99 <li>Various minor optimizations.</li>
 100 </ul></li>
 101 <li>Internal Changes:
 102 <ul>
 103 <li>Add support for embedding LuaJIT bytecode for builtins.</li>
 104 <li>Replace various builtins with embedded bytecode.</li>
 105 <li>Refactor string buffers and string formatting.</li>
 106 <li>Remove obsolete non-truncating number to integer conversions.</li>
 107 </ul></li>
 108 <li>Ports:
 109 <ul>
 110 <li>Add Xbox One port (<tt>LJ_GC64</tt> mode).</li>
 111 <li>ARM64: Add port of the interpreter (<tt>LJ_GC64</tt> mode).</li>
 112 <li>x64: Add separate port of the interpreter to <tt>LJ_GC64</tt> mode.</li>
 113 <li>x86/x64: Drop internal x87 math functions. Use libm functions.</li>
 114 <li>x86: Remove x87 support from interpreter. SSE2 is mandatory now.</li>
 115 <li>PPC/e500: Drop support for this architecture.</li>
 116 </ul></li>
 117 <li>FFI library:
 118 <ul>
 119 <li>FFI: Add 64 bit bitwise operations.</li>
 120 <li>FFI: Compile VLA/VLS and large cdata allocations with default initialization.</li>
 121 <li>FFI: Compile conversions from functions to function pointers.</li>
 122 <li>FFI: Compile lightuserdata to <tt>void *</tt> conversion.</li>
 123 <li>FFI: Compile <tt>ffi.gc(cdata, nil)</tt>, too.</li>
 124 <li>FFI: Add <tt>ffi.typeinfo()</tt>.</li>
 125 </ul></li>
 126 </ul>
 127 </div>
 128
 129 <div class="major" style="background: #ffffd0;">
 130 <h2 id="LuaJIT-2.0.4">LuaJIT 2.0.4 &mdash; 2015-05-14</h2>
 131 <ul>
 132 <li>Fix stack check in narrowing optimization.</li>
 133 <li>Fix Lua/C API typecheck error for special indexes.</li>
 134 <li>Fix string to number conversion.</li>
 135 <li>Fix lexer error for chunks without tokens.</li>
 136 <li>Don't compile <tt>IR_RETF</tt> after <tt>CALLT</tt> to ff with-side effects.</li>
 137 <li>Fix <tt>BC_UCLO</tt>/<tt>BC_JMP</tt> join optimization in Lua parser.</li>
 138 <li>Fix corner case in string to number conversion.</li>
 139 <li>Gracefully handle <tt>lua_error()</tt> for a suspended coroutine.</li>
 140 <li>Avoid error messages when building with Clang.</li>
 141 <li>Fix snapshot #0 handling for traces with a stack check on entry.</li>
 142 <li>Fix fused constant loads under high register pressure.</li>
 143 <li>Invalidate backpropagation cache after DCE.</li>
 144 <li>Fix ABC elimination.</li>
 145 <li>Fix debug info for main chunk of stripped bytecode.</li>
 146 <li>Fix FOLD rule for <tt>string.sub(s, ...) == k</tt>.</li>
 147 <li>Fix FOLD rule for <tt>STRREF</tt> of <tt>SNEW</tt>.</li>
 148 <li>Fix frame traversal while searching for error function.</li>
 149 <li>Prevent GC estimate miscalculation due to buffer growth.</li>
 150 <li>Prevent adding side traces for stack checks.</li>
 151 <li>Fix top slot calculation for snapshots with continuations.</li>
 152 <li>Fix check for reuse of SCEV results in <tt>FORL</tt>.</li>
 153 <li>Add PS Vita port.</li>
 154 <li>Fix compatibility issues with Illumos.</li>
 155 <li>Fix DragonFly build (unsupported).</li>
 156 <li>OpenBSD/x86: Better executable memory allocation for W^X mode.</li>
 157 <li>x86: Fix argument checks for <tt>ipairs()</tt> iterator.</li>
 158 <li>x86: <tt>lj_math_random_step()</tt> clobbers XMM regs on OSX Clang.</li>
 159 <li>x86: Fix code generation for unused result of <tt>math.random()</tt>.</li>
 160 <li>x64: Allow building with <tt>LUAJIT_USE_SYSMALLOC</tt> and <tt>LUAJIT_USE_VALGRIND</tt>.</li>
 161 <li>x86/x64: Fix argument check for bit shifts.</li>
 162 <li>x86/x64: Fix code generation for fused test/arith ops.</li>
 163 <li>ARM: Fix write barrier check in <tt>BC_USETS</tt>.</li>
 164 <li>PPC: Fix red zone overflow in machine code generation.</li>
 165 <li>PPC: Don't use <tt>mcrxr</tt> on PPE.</li>
 166 <li>Various archs: Fix excess stack growth in interpreter.</li>
 167 <li>FFI: Fix FOLD rule for <tt>TOBIT</tt> + <tt>CONV num.u32</tt>.</li>
 168 <li>FFI: Prevent DSE across <tt>ffi.string()</tt>.</li>
 169 <li>FFI: No meta fallback when indexing pointer to incomplete struct.</li>
 170 <li>FFI: Fix initialization of unions of subtypes.</li>
 171 <li>FFI: Fix cdata vs. non-cdata arithmetic and comparisons.</li>
 172 <li>FFI: Fix <tt>__index</tt>/<tt>__newindex</tt> metamethod resolution for ctypes.</li>
 173 <li>FFI: Fix compilation of reference field access.</li>
 174 <li>FFI: Fix frame traversal for backtraces with FFI callbacks.</li>
 175 <li>FFI: Fix recording of indexing a struct pointer ctype object itself.</li>
 176 <li>FFI: Allow non-scalar cdata to be compared for equality by address.</li>
 177 <li>FFI: Fix pseudo type conversions for type punning.</li>
 178 </ul>
 179
 180 <h2 id="LuaJIT-2.0.3">LuaJIT 2.0.3 &mdash; 2014-03-12</h2>
 181 <ul>
 182 <li>Add PS4 port.</li>
 183 <li>Add support for multilib distro builds.</li>
 184 <li>Fix OSX build.</li>
 185 <li>Fix MinGW build.</li>
 186 <li>Fix Xbox 360 build.</li>
 187 <li>Improve ULOAD forwarding for open upvalues.</li>
 188 <li>Fix GC steps threshold handling when called by JIT-compiled code.</li>
 189 <li>Fix argument checks for <tt>math.deg()</tt> and <tt>math.rad()</tt>.</li>
 190 <li>Fix <tt>jit.flush(func|true)</tt>.</li>
 191 <li>Respect <tt>jit.off(func)</tt> when returning to a function, too.</li>
 192 <li>Fix compilation of <tt>string.byte(s, nil, n)</tt>.</li>
 193 <li>Fix line number for relocated bytecode after closure fixup</li>
 194 <li>Fix frame traversal for backtraces.</li>
 195 <li>Fix ABC elimination.</li>
 196 <li>Fix handling of redundant PHIs.</li>
 197 <li>Fix snapshot restore for exit to function header.</li>
 198 <li>Fix type punning alias analysis for constified pointers</li>
 199 <li>Fix call unroll checks in the presence of metamethod frames.</li>
 200 <li>Fix initial maxslot for down-recursive traces.</li>
 201 <li>Prevent BASE register coalescing if parent uses <tt>IR_RETF</tt>.</li>
 202 <li>Don't purge modified function from stack slots in <tt>BC_RET</tt>.</li>
 203 <li>Fix recording of <tt>BC_VARG</tt>.</li>
 204 <li>Don't access dangling reference to reallocated IR.</li>
 205 <li>Fix frame depth display for bytecode dump in <tt>-jdump</tt>.</li>
 206 <li>ARM: Fix register allocation when rematerializing FPRs.</li>
 207 <li>x64: Fix store to upvalue for lightuserdata values.</li>
 208 <li>FFI: Add missing GC steps for callback argument conversions.</li>
 209 <li>FFI: Properly unload loaded DLLs.</li>
 210 <li>FFI: Fix argument checks for <tt>ffi.string()</tt>.</li>
 211 <li>FFI/x64: Fix passing of vector arguments to calls.</li>
 212 <li>FFI: Rehash finalizer table after GC cycle, if needed.</li>
 213 <li>FFI: Fix <tt>cts-&gt;L</tt> for cdata unsinking in snapshot restore.</li>
 214 </ul>
 215
 216 <h2 id="LuaJIT-2.0.2">LuaJIT 2.0.2 &mdash; 2013-06-03</h2>
 217 <ul>
 218 <li>Fix memory access check for fast string interning.</li>
 219 <li>Fix MSVC intrinsics for older versions.</li>
 220 <li>Add missing GC steps for <tt>io.*</tt> functions.</li>
 221 <li>Fix spurious red zone overflows in machine code generation.</li>
 222 <li>Fix jump-range constrained mcode allocation.</li>
 223 <li>Inhibit DSE for implicit loads via calls.</li>
 224 <li>Fix builtin string to number conversion for overflow digits.</li>
 225 <li>Fix optional argument handling while recording builtins.</li>
 226 <li>Fix optional argument handling in <tt>table.concat()</tt>.</li>
 227 <li>Add partial support for building with MingW64 GCC 4.8-SEH.</li>
 228 <li>Add missing PHI barrier to <tt>string.sub(str, a, b) == kstr</tt> FOLD rule.</li>
 229 <li>Fix compatibility issues with Illumos.</li>
 230 <li>ARM: Fix cache flush/sync for exit stubs of JIT-compiled code.</li>
 231 <li>MIPS: Fix cache flush/sync for JIT-compiled code jump area.</li>
 232 <li>PPC: Add <tt>plt</tt> suffix for external calls from assembler code.</li>
 233 <li>FFI: Fix snapshot substitution in SPLIT pass.</li>
 234 <li>FFI/x86: Fix register allocation for 64 bit comparisons.</li>
 235 <li>FFI: Fix tailcall in lowest frame to C&nbsp;function with bool result.</li>
 236 <li>FFI: Ignore <tt>long</tt> type specifier in <tt>ffi.istype()</tt>.</li>
 237 <li>FFI: Fix calling conventions for 32 bit OSX and iOS simulator (struct returns).</li>
 238 <li>FFI: Fix calling conventions for ARM hard-float EABI (nested structs).</li>
 239 <li>FFI: Improve error messages for arithmetic and comparison operators.</li>
 240 <li>FFI: Insert no-op type conversion for pointer to integer cast.</li>
 241 <li>FFI: Fix unroll limit for <tt>ffi.fill()</tt>.</li>
 242 <li>FFI: Must sink <tt>XBAR</tt> together with <tt>XSTORE</tt>s.</li>
 243 <li>FFI: Preserve intermediate string for <tt>const&nbsp;char&nbsp;*</tt> conversion.</li>
 244 </ul>
 245
 246 <h2 id="LuaJIT-2.0.1">LuaJIT 2.0.1 &mdash; 2013-02-19</h2>
 247 <ul>
 248 <li>Don't clear frame for out-of-memory error.</li>
 249 <li>Leave hook when resume catches error thrown from hook.</li>
 250 <li>Add missing GC steps for template table creation.</li>
 251 <li>Fix discharge order of comparisons in Lua parser.</li>
 252 <li>Improve buffer handling for <tt>io.read()</tt>.</li>
 253 <li>OSX: Add support for Mach-O object files to <tt>-b</tt> option.</li>
 254 <li>Fix PS3 port.</li>
 255 <li>Fix/enable Xbox 360 port.</li>
 256 <li>x86/x64: Always mark ref for shift count as non-weak.</li>
 257 <li>x64: Don't fuse implicitly 32-to-64 extended operands.</li>
 258 <li>ARM: Fix armhf call argument handling.</li>
 259 <li>ARM: Fix code generation for integer math.min/math.max.</li>
 260 <li>PPC/e500: Fix <tt>lj_vm_floor()</tt> for Inf/NaN.</li>
 261 <li>FFI: Change priority of table initializer variants for structs.</li>
 262 <li>FFI: Fix code generation for bool call result check on x86/x64.</li>
 263 <li>FFI: Load FFI library on-demand for bytecode with cdata literals.</li>
 264 <li>FFI: Fix handling of qualified transparent structs/unions.</li>
 265 </ul>
 266
 267 <h2 id="LuaJIT-2.0.0">LuaJIT 2.0.0 &mdash; 2012-11-08</h2>
 268 <ul>
 269 <li>Correctness and completeness:
 270 <ul>
 271   <li>Fix Android/x86 build.</li>
 272   <li>Fix recording of equality comparisons with <tt>__eq</tt> metamethods.</li>
 273   <li>Fix detection of immutable upvalues.</li>
 274   <li>Replace error with PANIC for callbacks from JIT-compiled code.</li>
 275   <li>Fix builtin string to number conversion for <tt>INT_MIN</tt>.</li>
 276   <li>Don't create unneeded array part for template tables.</li>
 277   <li>Fix <tt>CONV.num.int</tt> sinking.</li>
 278   <li>Don't propagate implicitly widened number to index metamethods.</li>
 279   <li>ARM: Fix ordered comparisons of number vs. non-number.</li>
 280   <li>FFI: Fix code generation for replay of sunk float fields.</li>
 281   <li>FFI: Fix signedness of bool.</li>
 282   <li>FFI: Fix recording of bool call result check on x86/x64.</li>
 283   <li>FFI: Fix stack-adjustment for <tt>__thiscall</tt> callbacks.</li>
 284 </ul></li>
 285 </ul>
 286
 287 <h2 id="LuaJIT-2.0.0-beta11">LuaJIT 2.0.0-beta11 &mdash; 2012-10-16</h2>
 288 <ul>
 289 <li>New features:
 290 <ul>
 291   <li>Use ARM VFP instructions, if available (build-time detection).</li>
 292   <li>Add support for ARM hard-float EABI (<tt>armhf</tt>).</li>
 293   <li>Add PS3 port.</li>
 294   <li>Add many features from Lua&nbsp;5.2, e.g. <tt>goto</tt>/labels.
 295   Refer to <a href="extensions.html#lua52">this list</a>.</li>
 296   <li>FFI: Add parameterized C types.</li>
 297   <li>FFI: Add support for copy constructors.</li>
 298   <li>FFI: Equality comparisons never raise an error (treat as unequal instead).</li>
 299   <li>FFI: Box all accessed or returned enums.</li>
 300   <li>FFI: Check for <tt>__new</tt> metamethod when calling a constructor.</li>
 301   <li>FFI: Handle <tt>__pairs</tt>/<tt>__ipairs</tt> metamethods for cdata objects.</li>
 302   <li>FFI: Convert <tt>io.*</tt> file handle to <tt>FILE *</tt> pointer (but as a <tt>void *</tt>).</li>
 303   <li>FFI: Detect and support type punning through unions.</li>
 304   <li>FFI: Improve various error messages.</li>
 305 </ul></li>
 306 <li>Build-system reorganization:
 307 <ul>
 308   <li>Reorganize directory layout:<br>
 309   <tt>lib/*</tt> &rarr; <tt>src/jit/*</tt><br>
 310   <tt>src/buildvm_*.dasc</tt> &rarr; <tt>src/vm_*.dasc</tt><br>
 311   <tt>src/buildvm_*.h</tt> &rarr; removed<br>
 312   <tt>src/buildvm*</tt> &rarr; <tt>src/host/*</tt></li>
 313   <li>Add minified Lua interpreter plus Lua BitOp (<tt>minilua</tt>) to run DynASM.</li>
 314   <li>Change DynASM bit operations to use Lua BitOp</li>
 315   <li>Translate only <tt>vm_*.dasc</tt> for detected target architecture.</li>
 316   <li>Improve target detection for <tt>msvcbuild.bat</tt>.</li>
 317   <li>Fix build issues on Cygwin and MinGW with optional MSys.</li>
 318   <li>Handle cross-compiles with FPU/no-FPU or hard-fp/soft-fp ABI mismatch.</li>
 319   <li>Remove some library functions for no-JIT/no-FFI builds.</li>
 320   <li>Add uninstall target to top-level Makefile.</li>
 321 </ul></li>
 322 <li>Correctness and completeness:
 323 <ul>
 324   <li>Preserve snapshot #0 PC for all traces.</li>
 325   <li>Fix argument checks for <tt>coroutine.create()</tt>.</li>
 326   <li>Command line prints version and JIT status to <tt>stdout</tt>, not <tt>stderr</tt>.</li>
 327   <li>Fix userdata <tt>__gc</tt> separations at Lua state close.</li>
 328   <li>Fix <tt>TDUP</tt> to <tt>HLOAD</tt> forwarding for <tt>LJ_DUALNUM</tt> builds.</li>
 329   <li>Fix buffer check in bytecode writer.</li>
 330   <li>Make <tt>os.date()</tt> thread-safe.</li>
 331   <li>Add missing declarations for MSVC intrinsics.</li>
 332   <li>Fix dispatch table modifications for return hooks.</li>
 333   <li>Workaround for MSVC conversion bug (<tt>double</tt> &rarr; <tt>uint32_t</tt> &rarr; <tt>int32_t</tt>).</li>
 334   <li>Fix FOLD rule <tt>(i-j)-i => 0-j</tt>.</li>
 335   <li>Never use DWARF unwinder on Windows.</li>
 336   <li>Fix shrinking of direct mapped blocks in builtin allocator.</li>
 337   <li>Limit recursion depth in <tt>string.match()</tt> et al.</li>
 338   <li>Fix late despecialization of <tt>ITERN</tt> after loop has been entered.</li>
 339   <li>Fix <tt>'f'</tt> and <tt>'L'</tt> options for <tt>debug.getinfo()</tt> and <tt>lua_getinfo()</tt>.</li>
 340   <li>Fix <tt>package.searchpath()</tt>.</li>
 341   <li>OSX: Change dylib names to be consistent with other platforms.</li>
 342   <li>Android: Workaround for broken <tt>sprintf("%g",&nbsp;-0.0)</tt>.</li>
 343   <li>x86: Remove support for ancient CPUs without <tt>CMOV</tt> (before Pentium Pro).</li>
 344   <li>x86: Fix register allocation for calls returning register pair.</li>
 345   <li>x86/x64: Fix fusion of unsigned byte comparisons with swapped operands.</li>
 346   <li>ARM: Fix <tt>tonumber()</tt> argument check.</li>
 347   <li>ARM: Fix modulo operator and <tt>math.floor()</tt>/<tt>math.ceil()</tt> for <tt>inf</tt>/<tt>nan</tt>.</li>
 348   <li>ARM: Invoke SPLIT pass for leftover <tt>IR_TOBIT</tt>.</li>
 349   <li>ARM: Fix BASE register coalescing.</li>
 350   <li>PPC: Fix interpreter state setup in callbacks.</li>
 351   <li>PPC: Fix <tt>string.sub()</tt> range check.</li>
 352   <li>MIPS: Support generation of MIPS/MIPSEL bytecode object files.</li>
 353   <li>MIPS: Fix calls to <tt>floor()</tt>/<tt>ceil()</tt><tt>/trunc()</tt>.</li>
 354   <li>ARM/PPC: Detect more target architecture variants.</li>
 355   <li>ARM/PPC/e500/MIPS: Fix tailcalls from fast functions, esp. <tt>tostring()</tt>.</li>
 356   <li>ARM/PPC/MIPS: Fix rematerialization of FP constants.</li>
 357   <li>FFI: Don't call <tt>FreeLibrary()</tt> on our own EXE/DLL.</li>
 358   <li>FFI: Resolve metamethods for constructors, too.</li>
 359   <li>FFI: Properly disable callbacks on iOS (would require executable memory).</li>
 360   <li>FFI: Fix cdecl string parsing during recording.</li>
 361   <li>FFI: Show address pointed to for <tt>tostring(ref)</tt>, too.</li>
 362   <li>FFI: Fix alignment of C call argument/return structure.</li>
 363   <li>FFI: Initialize all fields of standard types.</li>
 364   <li>FFI: Fix callback handling when new C&nbsp;types are declared in callback.</li>
 365   <li>FFI: Fix recording of constructors for pointers.</li>
 366   <li>FFI: Always resolve metamethods for pointers to structs.</li>
 367   <li>FFI: Correctly propagate alignment when interning nested types.</li>
 368 </ul></li>
 369 <li>Structural and performance enhancements:
 370 <ul>
 371   <li>Add allocation sinking and store sinking optimization.</li>
 372   <li>Constify immutable upvalues.</li>
 373   <li>Add builtin string to integer or FP number conversion. Improves cross-platform consistency and correctness.</li>
 374   <li>Create string hash slots in template tables for non-const values, too. Avoids later table resizes.</li>
 375   <li>Eliminate <tt>HREFK</tt> guard for template table references.</li>
 376   <li>Add various new FOLD rules.</li>
 377   <li>Don't use stack unwinding for <tt>lua_yield()</tt> (slow on x64).</li>
 378   <li>ARM, PPC, MIPS: Improve <tt>XLOAD</tt> operand fusion and register hinting.</li>
 379   <li>PPC, MIPS: Compile <tt>math.sqrt()</tt> to sqrt instruction, if available.</li>
 380   <li>FFI: Fold <tt>KPTR</tt> + constant offset in SPLIT pass.</li>
 381   <li>FFI: Optimize/inline <tt>ffi.copy()</tt> and <tt>ffi.fill()</tt>.</li>
 382   <li>FFI: Compile and optimize array/struct copies.</li>
 383   <li>FFI: Compile <tt>ffi.typeof(cdata|ctype)</tt>, <tt>ffi.sizeof()</tt>, <tt>ffi.alignof()</tt>, <tt>ffi.offsetof()</tt> and <tt>ffi.gc()</tt>.</li>
 384 </ul></li>
 385 </ul>
 386
 387 <h2 id="LuaJIT-2.0.0-beta10">LuaJIT 2.0.0-beta10 &mdash; 2012-05-09</h2>
 388 <ul>
 389 <li>New features:
 390 <ul>
 391 <li>The MIPS of LuaJIT is complete. It requires a CPU conforming to the
 392 MIPS32&nbsp;R1 architecture with hardware FPU. O32 hard-fp ABI,
 393 little-endian or big-endian.</li>
 394 <li>Auto-detect target arch via cross-compiler. No need for
 395 <tt>TARGET=arch</tt> anymore.</li>
 396 <li>Make DynASM compatible with Lua 5.2.</li>
 397 <li>From Lua 5.2: Try <tt>__tostring</tt> metamethod on non-string error
 398 messages..</li>
 399 </ul></li>
 400 <li>Correctness and completeness:
 401 <ul>
 402 <li>Fix parsing of hex literals with exponents.</li>
 403 <li>Fix bytecode dump for certain number constants.</li>
 404 <li>Fix argument type in error message for relative arguments.</li>
 405 <li>Fix argument error handling on Lua stacks without a frame.</li>
 406 <li>Add missing mcode limit check in assembler backend.</li>
 407 <li>Fix compilation on OpenBSD.</li>
 408 <li>Avoid recursive GC steps after GC-triggered trace exit.</li>
 409 <li>Replace <tt>&lt;unwind.h&gt;</tt> definitions with our own.</li>
 410 <li>Fix OSX build issues. Bump minimum required OSX version to 10.4.</li>
 411 <li>Fix discharge order of comparisons in Lua parser.</li>
 412 <li>Ensure running <tt>__gc</tt> of userdata created in <tt>__gc</tt>
 413 at state close.</li>
 414 <li>Limit number of userdata <tt>__gc</tt> separations at state close.</li>
 415 <li>Fix bytecode <tt>JMP</tt> slot range when optimizing
 416 <tt>and</tt>/<tt>or</tt> with constant LHS.</li>
 417 <li>Fix DSE of <tt>USTORE</tt>.</li>
 418 <li>Make <tt>lua_concat()</tt> work from C&nbsp;hook with partial frame.</li>
 419 <li>Add required PHIs for implicit conversions, e.g. via <tt>XREF</tt>
 420 forwarding.</li>
 421 <li>Add more comparison variants to Valgrind suppressions file.</li>
 422 <li>Disable loading bytecode with an extra header (BOM or <tt>#!</tt>).</li>
 423 <li>Fix PHI stack slot syncing.</li>
 424 <li>ARM: Reorder type/value tests to silence Valgrind.</li>
 425 <li>ARM: Fix register allocation for <tt>ldrd</tt>-optimized
 426 <tt>HREFK</tt>.</li>
 427 <li>ARM: Fix conditional branch fixup for <tt>OBAR</tt>.</li>
 428 <li>ARM: Invoke SPLIT pass for <tt>double</tt> args in FFI call.</li>
 429 <li>ARM: Handle all <tt>CALL*</tt> ops with <tt>double</tt> results in
 430 SPLIT pass.</li>
 431 <li>ARM: Fix rejoin of <tt>POW</tt> in SPLIT pass.</li>
 432 <li>ARM: Fix compilation of <tt>math.sinh</tt>, <tt>math.cosh</tt>,
 433 <tt>math.tanh</tt>.</li>
 434 <li>ARM, PPC: Avoid pointless arg clearing in <tt>BC_IFUNCF</tt>.</li>
 435 <li>PPC: Fix resume after yield from hook.</li>
 436 <li>PPC: Fix argument checking for <tt>rawget()</tt>.</li>
 437 <li>PPC: Fix fusion of floating-point <tt>XLOAD</tt>/<tt>XSTORE</tt>.</li>
 438 <li>PPC: Fix <tt>HREFK</tt> code generation for huge tables.</li>
 439 <li>PPC: Use builtin D-Cache/I-Cache sync code.</li>
 440 </ul></li>
 441 <li>FFI library:
 442 <ul>
 443 <li>Ignore empty statements in <tt>ffi.cdef()</tt>.</li>
 444 <li>Ignore number parsing errors while skipping definitions.</li>
 445 <li>Don't touch frame in callbacks with tailcalls to fast functions.</li>
 446 <li>Fix library unloading on POSIX systems.</li>
 447 <li>Finalize cdata before userdata when closing the state.</li>
 448 <li>Change <tt>ffi.load()</tt> library name resolution for Cygwin.</li>
 449 <li>Fix resolving of function name redirects on Windows/x86.</li>
 450 <li>Fix symbol resolving error messages on Windows.</li>
 451 <li>Fix blacklisting of C functions calling callbacks.</li>
 452 <li>Fix result type of pointer difference.</li>
 453 <li>Use correct PC in FFI metamethod error message.</li>
 454 <li>Allow <tt>'typedef _Bool int BOOL;'</tt> for the Windows API.</li>
 455 <li>Don't record test for bool result of call, if ignored.</li>
 456 </ul></li>
 457 </ul>
 458
 459 <h2 id="LuaJIT-2.0.0-beta9">LuaJIT 2.0.0-beta9 &mdash; 2011-12-14</h2>
 460 <ul>
 461 <li>New features:
 462 <ul>
 463 <li>PPC port of LuaJIT is complete. Default is the dual-number port
 464 (usually faster). Single-number port selectable via <tt>src/Makefile</tt>
 465 at build time.</li>
 466 <li>Add FFI callback support.</li>
 467 <li>Extend <tt>-b</tt> to generate <tt>.c</tt>, <tt>.h</tt> or <tt>.obj/.o</tt>
 468 files with embedded bytecode.</li>
 469 <li>Allow loading embedded bytecode with <tt>require()</tt>.</li>
 470 <li>From Lua 5.2: Change to <tt>'\z'</tt> escape. Reject undefined escape
 471 sequences.</li>
 472 </ul></li>
 473 <li>Correctness and completeness:
 474 <ul>
 475 <li>Fix OSX 10.7 build. Fix <tt>install_name</tt> and versioning on OSX.</li>
 476 <li>Fix iOS build.</li>
 477 <li>Install <tt>dis_arm.lua</tt>, too.</li>
 478 <li>Mark installed shared library as executable.</li>
 479 <li>Add debug option to <tt>msvcbuild.bat</tt> and improve error handling.</li>
 480 <li>Fix data-flow analysis for iterators.</li>
 481 <li>Fix forced unwinding triggered by external unwinder.</li>
 482 <li>Record missing <tt>for</tt> loop slot loads (return to lower frame).</li>
 483 <li>Always use ANSI variants of Windows system functions.</li>
 484 <li>Fix GC barrier for multi-result table constructor (<tt>TSETM</tt>).</li>
 485 <li>Fix/add various FOLD rules.</li>
 486 <li>Add potential PHI for number conversions due to type instability.</li>
 487 <li>Do not eliminate PHIs only referenced from other PHIs.</li>
 488 <li>Correctly anchor implicit number to string conversions in Lua/C API.</li>
 489 <li>Fix various stack limit checks.</li>
 490 <li>x64: Use thread-safe exceptions for external unwinding (GCC platforms).</li>
 491 <li>x64: Fix result type of cdata index conversions.</li>
 492 <li>x64: Fix <tt>math.random()</tt> and <tt>bit.bswap()</tt> code generation.</li>
 493 <li>x64: Fix <tt>lightuserdata</tt> comparisons.</li>
 494 <li>x64: Always extend stack-passed arguments to pointer size.</li>
 495 <li>ARM: Many fixes to code generation backend.</li>
 496 <li>PPC/e500: Fix dispatch for binop metamethods.</li>
 497 <li>PPC/e500: Save/restore condition registers when entering/leaving the VM.</li>
 498 <li>PPC/e500: Fix write barrier in stores of strings to upvalues.</li>
 499 </ul></li>
 500 <li>FFI library:
 501 <ul>
 502 <li>Fix C comment parsing.</li>
 503 <li>Fix snapshot optimization for cdata comparisons.</li>
 504 <li>Fix recording of const/enum lookups in namespaces.</li>
 505 <li>Fix call argument and return handling for <tt>I8/U8/I16/U16</tt> types.</li>
 506 <li>Fix unfused loads of float fields.</li>
 507 <li>Fix <tt>ffi.string()</tt> recording.</li>
 508 <li>Save <tt>GetLastError()</tt> around <tt>ffi.load()</tt> and symbol
 509 resolving, too.</li>
 510 <li>Improve ld script detection in <tt>ffi.load()</tt>.</li>
 511 <li>Record loads/stores to external variables in namespaces.</li>
 512 <li>Compile calls to stdcall, fastcall and vararg functions.</li>
 513 <li>Treat function ctypes like pointers in comparisons.</li>
 514 <li>Resolve <tt>__call</tt> metamethod for pointers, too.</li>
 515 <li>Record C function calls with bool return values.</li>
 516 <li>Record <tt>ffi.errno()</tt>.</li>
 517 <li>x86: Fix number to <tt>uint32_t</tt> conversion rounding.</li>
 518 <li>x86: Fix 64 bit arithmetic in assembler backend.</li>
 519 <li>x64: Fix struct-by-value calling conventions.</li>
 520 <li>ARM: Ensure invocation of SPLIT pass for float conversions.</li>
 521 </ul></li>
 522 <li>Structural and performance enhancements:
 523 <ul>
 524 <li>Display trace types with <tt>-jv</tt> and <tt>-jdump</tt>.</li>
 525 <li>Record isolated calls. But prefer recording loops over calls.</li>
 526 <li>Specialize to prototype for non-monomorphic functions. Solves the
 527 trace-explosion problem for closure-heavy programming styles.</li>
 528 <li>Always generate a portable <tt>vmdef.lua</tt>. Easier for distros.</li>
 529 </ul></li>
 530 </ul>
 531
 532 <h2 id="LuaJIT-2.0.0-beta8">LuaJIT 2.0.0-beta8 &mdash; 2011-06-23</h2>
 533 <ul>
 534 <li>New features:
 535 <ul>
 536 <li>Soft-float ARM port of LuaJIT is complete.</li>
 537 <li>Add support for bytecode loading/saving and <tt>-b</tt> command line
 538 option.</li>
 539 <li>From Lua 5.2: <tt>__len</tt> metamethod for tables
 540 (disabled by default).</li>
 541 </ul></li>
 542 <li>Correctness and completeness:
 543 <ul>
 544 <li>ARM: Misc. fixes for interpreter.</li>
 545 <li>x86/x64: Fix <tt>bit.*</tt> argument checking in interpreter.</li>
 546 <li>Catch early out-of-memory in memory allocator initialization.</li>
 547 <li>Fix data-flow analysis for paths leading to an upvalue close.</li>
 548 <li>Fix check for missing arguments in <tt>string.format()</tt>.</li>
 549 <li>Fix Solaris/x86 build (note: not a supported target).</li>
 550 <li>Fix recording of loops with instable directions in side traces.</li>
 551 <li>x86/x64: Fix fusion of comparisons with <tt>u8</tt>/<tt>u16</tt>
 552 <tt>XLOAD</tt>.</li>
 553 <li>x86/x64: Fix register allocation for variable shifts.</li>
 554 </ul></li>
 555 <li>FFI library:
 556 <ul>
 557 <li>Add <tt>ffi.errno()</tt>. Save <tt>errno</tt>/<tt>GetLastError()</tt>
 558 around allocations etc.</li>
 559 <li>Fix <tt>__gc</tt> for VLA/VLS cdata objects.</li>
 560 <li>Fix recording of casts from 32 bit cdata pointers to integers.</li>
 561 <li><tt>tonumber(cdata)</tt> returns <tt>nil</tt> for non-numbers.</li>
 562 <li>Show address pointed to for <tt>tostring(pointer)</tt>.</li>
 563 <li>Print <tt>NULL</tt> pointers as <tt>"cdata&lt;... *&gt;: NULL"</tt>.</li>
 564 <li>Support <tt>__tostring</tt> metamethod for pointers to structs, too.</li>
 565 </ul></li>
 566 <li>Structural and performance enhancements:
 567 <ul>
 568 <li>More tuning for loop unrolling heuristics.</li>
 569 <li>Flatten and compress in-memory debug info (saves ~70%).</li>
 570 </ul></li>
 571 </ul>
 572
 573 <h2 id="LuaJIT-2.0.0-beta7">LuaJIT 2.0.0-beta7 &mdash; 2011-05-05</h2>
 574 <ul>
 575 <li>New features:
 576 <ul>
 577 <li>ARM port of the LuaJIT interpreter is complete.</li>
 578 <li>FFI library: Add <tt>ffi.gc()</tt>, <tt>ffi.metatype()</tt>,
 579 <tt>ffi.istype()</tt>.</li>
 580 <li>FFI library: Resolve ld script redirection in <tt>ffi.load()</tt>.</li>
 581 <li>From Lua 5.2: <tt>package.searchpath()</tt>, <tt>fp:read("*L")</tt>,
 582 <tt>load(string)</tt>.</li>
 583 <li>From Lua 5.2, disabled by default: empty statement,
 584 <tt>table.unpack()</tt>, modified <tt>coroutine.running()</tt>.</li>
 585 </ul></li>
 586 <li>Correctness and completeness:
 587 <ul>
 588 <li>FFI library: numerous fixes.</li>
 589 <li>Fix type mismatches in store-to-load forwarding.</li>
 590 <li>Fix error handling within metamethods.</li>
 591 <li>Fix <tt>table.maxn()</tt>.</li>
 592 <li>Improve accuracy of <tt>x^-k</tt> on x64.</li>
 593 <li>Fix code generation for Intel Atom in x64 mode.</li>
 594 <li>Fix narrowing of POW.</li>
 595 <li>Fix recording of retried fast functions.</li>
 596 <li>Fix code generation for <tt>bit.bnot()</tt> and multiplies.</li>
 597 <li>Fix error location within cpcall frames.</li>
 598 <li>Add workaround for old libgcc unwind bug.</li>
 599 <li>Fix <tt>lua_yield()</tt> and <tt>getmetatable(lightuserdata)</tt> on x64.</li>
 600 <li>Misc. fixes for PPC/e500 interpreter.</li>
 601 <li>Fix stack slot updates for down-recursion.</li>
 602 </ul></li>
 603 <li>Structural and performance enhancements:
 604 <ul>
 605 <li>Add dual-number mode (int/double) for the VM. Enabled for ARM.</li>
 606 <li>Improve narrowing of arithmetic operators and <tt>for</tt> loops.</li>
 607 <li>Tune loop unrolling heuristics and increase trace recorder limits.</li>
 608 <li>Eliminate dead slots in snapshots using bytecode data-flow analysis.</li>
 609 <li>Avoid phantom stores to proxy tables.</li>
 610 <li>Optimize lookups in empty proxy tables.</li>
 611 <li>Improve bytecode optimization of <tt>and</tt>/<tt>or</tt> operators.</li>
 612 </ul></li>
 613 </ul>
 614
 615 <h2 id="LuaJIT-2.0.0-beta6">LuaJIT 2.0.0-beta6 &mdash; 2011-02-11</h2>
 616 <ul>
 617 <li>New features:
 618 <ul>
 619 <li>PowerPC/e500v2 port of the LuaJIT interpreter is complete.</li>
 620 <li>Various minor features from Lua 5.2: Hex escapes in literals,
 621 <tt>'\*'</tt> escape, reversible <tt>string.format("%q",s)</tt>,
 622 <tt>"%g"</tt> pattern, <tt>table.sort</tt> checks callbacks,
 623 <tt>os.exit(status|true|false[,close])</tt>.</li>
 624 <li>Lua 5.2 <tt>__pairs</tt> and <tt>__ipairs</tt> metamethods
 625 (disabled by default).</li>
 626 <li>Initial release of the FFI library.</li>
 627 </ul></li>
 628 <li>Correctness and completeness:
 629 <ul>
 630 <li>Fix <tt>string.format()</tt> for non-finite numbers.</li>
 631 <li>Fix memory leak when compiled to use the built-in allocator.</li>
 632 <li>x86/x64: Fix unnecessary resize in <tt>TSETM</tt> bytecode.</li>
 633 <li>Fix various GC issues with traces and <tt>jit.flush()</tt>.</li>
 634 <li>x64: Fix fusion of indexes for array references.</li>
 635 <li>x86/x64: Fix stack overflow handling for coroutine results.</li>
 636 <li>Enable low-2GB memory allocation on FreeBSD/x64.</li>
 637 <li>Fix <tt>collectgarbage("count")</tt> result if more than 2GB is in use.</li>
 638 <li>Fix parsing of hex floats.</li>
 639 <li>x86/x64: Fix loop branch inversion with trailing
 640 <tt>HREF+NE/EQ</tt>.</li>
 641 <li>Add <tt>jit.os</tt> string.</li>
 642 <li><tt>coroutine.create()</tt> permits running C functions, too.</li>
 643 <li>Fix OSX build to work with newer ld64 versions.</li>
 644 <li>Fix bytecode optimization of <tt>and</tt>/<tt>or</tt> operators.</li>
 645 </ul></li>
 646 <li>Structural and performance enhancements:
 647 <ul>
 648 <li>Emit specialized bytecode for <tt>pairs()</tt>/<tt>next()</tt>.</li>
 649 <li>Improve bytecode coalescing of <tt>nil</tt> constants.</li>
 650 <li>Compile calls to vararg functions.</li>
 651 <li>Compile <tt>select()</tt>.</li>
 652 <li>Improve alias analysis, esp. for loads from allocations.</li>
 653 <li>Tuning of various compiler heuristics.</li>
 654 <li>Refactor and extend IR conversion instructions.</li>
 655 <li>x86/x64: Various backend enhancements related to the FFI.</li>
 656 <li>Add SPLIT pass to split 64 bit IR instructions for 32 bit CPUs.</li>
 657 </ul></li>
 658 </ul>
 659
 660 <h2 id="LuaJIT-2.0.0-beta5">LuaJIT 2.0.0-beta5 &mdash; 2010-08-24</h2>
 661 <ul>
 662 <li>Correctness and completeness:
 663 <ul>
 664 <li>Fix trace exit dispatch to function headers.</li>
 665 <li>Fix Windows and OSX builds with LUAJIT_DISABLE_JIT.</li>
 666 <li>Reorganize and fix placement of generated machine code on x64.</li>
 667 <li>Fix TNEW in x64 interpreter.</li>
 668 <li>Do not eliminate PHIs for values only referenced from side exits.</li>
 669 <li>OS-independent canonicalization of strings for non-finite numbers.</li>
 670 <li>Fix <tt>string.char()</tt> range check on x64.</li>
 671 <li>Fix <tt>tostring()</tt> resolving within <tt>print()</tt>.</li>
 672 <li>Fix error handling for <tt>next()</tt>.</li>
 673 <li>Fix passing of constant arguments to external calls on x64.</li>
 674 <li>Fix interpreter argument check for two-argument SSE math functions.</li>
 675 <li>Fix C frame chain corruption caused by <tt>lua_cpcall()</tt>.</li>
 676 <li>Fix return from <tt>pcall()</tt> within active hook.</li>
 677 </ul></li>
 678 <li>Structural and performance enhancements:
 679 <ul>
 680 <li>Replace on-trace GC frame syncing with interpreter exit.</li>
 681 <li>Improve hash lookup specialization by not removing dead keys during GC.</li>
 682 <li>Turn traces into true GC objects.</li>
 683 <li>Avoid starting a GC cycle immediately after library init.</li>
 684 <li>Add weak guards to improve dead-code elimination.</li>
 685 <li>Speed up string interning.</li>
 686 </ul></li>
 687 </ul>
 688
 689 <h2 id="LuaJIT-2.0.0-beta4">LuaJIT 2.0.0-beta4 &mdash; 2010-03-28</h2>
 690 <ul>
 691 <li>Correctness and completeness:
 692 <ul>
 693 <li>Fix precondition for on-trace creation of table keys.</li>
 694 <li>Fix <tt>{f()}</tt> on x64 when table is resized.</li>
 695 <li>Fix folding of ordered comparisons with same references.</li>
 696 <li>Fix snapshot restores for multi-result bytecodes.</li>
 697 <li>Fix potential hang when recording bytecode with nested closures.</li>
 698 <li>Fix recording of <tt>getmetatable()</tt>, <tt>tonumber()</tt> and bad argument types.</li>
 699 <li>Fix SLOAD fusion across returns to lower frames.</li>
 700 </ul></li>
 701 <li>Structural and performance enhancements:
 702 <ul>
 703 <li>Add array bounds check elimination. <tt>-Oabc</tt> is enabled by default.</li>
 704 <li>More tuning for x64, e.g. smaller table objects.</li>
 705 </ul></li>
 706 </ul>
 707
 708 <h2 id="LuaJIT-2.0.0-beta3">LuaJIT 2.0.0-beta3 &mdash; 2010-03-07</h2>
 709 <ul>
 710 <li>LuaJIT x64 port:
 711 <ul>
 712 <li>Port integrated memory allocator to Linux/x64, Windows/x64 and OSX/x64.</li>
 713 <li>Port interpreter and JIT compiler to x64.</li>
 714 <li>Port DynASM to x64.</li>
 715 <li>Many 32/64 bit cleanups in the VM.</li>
 716 <li>Allow building the interpreter with either x87 or SSE2 arithmetics.</li>
 717 <li>Add external unwinding and C++ exception interop (default on x64).</li>
 718 </ul></li>
 719 <li>Correctness and completeness:
 720 <ul>
 721 <li>Fix constructor bytecode generation for certain conditional values.</li>
 722 <li>Fix some cases of ordered string comparisons.</li>
 723 <li>Fix <tt>lua_tocfunction()</tt>.</li>
 724 <li>Fix cutoff register in JMP bytecode for some conditional expressions.</li>
 725 <li>Fix PHI marking algorithm for references from variant slots.</li>
 726 <li>Fix <tt>package.cpath</tt> for non-default PREFIX.</li>
 727 <li>Fix DWARF2 frame unwind information for interpreter on OSX.</li>
 728 <li>Drive the GC forward on string allocations in the parser.</li>
 729 <li>Implement call/return hooks (zero-cost if disabled).</li>
 730 <li>Implement yield from C hooks.</li>
 731 <li>Disable JIT compiler on older non-SSE2 CPUs instead of aborting.</li>
 732 </ul></li>
 733 <li>Structural and performance enhancements:
 734 <ul>
 735 <li>Compile recursive code (tail-, up- and down-recursion).</li>
 736 <li>Improve heuristics for bytecode penalties and blacklisting.</li>
 737 <li>Split CALL/FUNC recording and clean up fast function call semantics.</li>
 738 <li>Major redesign of internal function call handling.</li>
 739 <li>Improve FOR loop const specialization and integerness checks.</li>
 740 <li>Switch to pre-initialized stacks. Avoid frame-clearing.</li>
 741 <li>Colocation of prototypes and related data: bytecode, constants, debug info.</li>
 742 <li>Cleanup parser and streamline bytecode generation.</li>
 743 <li>Add support for weak IR references to register allocator.</li>
 744 <li>Switch to compressed, extensible snapshots.</li>
 745 <li>Compile returns to frames below the start frame.</li>
 746 <li>Improve alias analysis of upvalues using a disambiguation hash value.</li>
 747 <li>Compile floor/ceil/trunc to SSE2 helper calls or SSE4.1 instructions.</li>
 748 <li>Add generic C call handling to IR and backend.</li>
 749 <li>Improve KNUM fuse vs. load heuristics.</li>
 750 <li>Compile various <tt>io.*()</tt> functions.</li>
 751 <li>Compile <tt>math.sinh()</tt>, <tt>math.cosh()</tt>, <tt>math.tanh()</tt>
 752 and <tt>math.random()</tt>.</li>
 753 </ul></li>
 754 </ul>
 755
 756 <h2 id="LuaJIT-2.0.0-beta2">LuaJIT 2.0.0-beta2 &mdash; 2009-11-09</h2>
 757 <ul>
 758 <li>Reorganize build system. Build static+shared library on POSIX.</li>
 759 <li>Allow C++ exception conversion on all platforms
 760 using a wrapper function.</li>
 761 <li>Automatically catch C++ exceptions and rethrow Lua error
 762 (DWARF2 only).</li>
 763 <li>Check for the correct x87 FPU precision at strategic points.</li>
 764 <li>Always use wrappers for libm functions.</li>
 765 <li>Resurrect metamethod name strings before copying them.</li>
 766 <li>Mark current trace, even if compiler is idle.</li>
 767 <li>Ensure FILE metatable is created only once.</li>
 768 <li>Fix type comparisons when different integer types are involved.</li>
 769 <li>Fix <tt>getmetatable()</tt> recording.</li>
 770 <li>Fix TDUP with dead keys in template table.</li>
 771 <li><tt>jit.flush(tr)</tt> returns status.
 772 Prevent manual flush of a trace that's still linked.</li>
 773 <li>Improve register allocation heuristics for invariant references.</li>
 774 <li>Compile the push/pop variants of <tt>table.insert()</tt> and
 775 <tt>table.remove()</tt>.</li>
 776 <li>Compatibility with MSVC <tt>link&nbsp/debug</tt>.</li>
 777 <li>Fix <tt>lua_iscfunction()</tt>.</li>
 778 <li>Fix <tt>math.random()</tt> when compiled with <tt>-fpic</tt> (OSX).</li>
 779 <li>Fix <tt>table.maxn()</tt>.</li>
 780 <li>Bump <tt>MACOSX_DEPLOYMENT_TARGET</tt> to <tt>10.4</tt></li>
 781 <li><tt>luaL_check*()</tt> and <tt>luaL_opt*()</tt> now support
 782 negative arguments, too.<br>
 783 This matches the behavior of Lua 5.1, but not the specification.</li>
 784 </ul>
 785
 786 <h2 id="LuaJIT-2.0.0-beta1">LuaJIT 2.0.0-beta1 &mdash; 2009-10-31</h2>
 787 <ul>
 788 <li>This is the first public release of LuaJIT 2.0.</li>
 789 <li>The whole VM has been rewritten from the ground up, so there's
 790 no point in listing differences over earlier versions.</li>
 791 </ul>
 792 </div>
 793 <br class="flush">
 794 </div>
 795 <div id="foot">
 796 <hr class="hide">
 797 Copyright &copy; 2005-2015 Mike Pall
 798 <span class="noprint">
 799 &middot;
 800 <a href="contact.html">Contact</a>
 801 </span>
 802 </div>
 803 </body>
 804 </html>