LuaJIT Change History

-This is a list of changes between the released versions of LuaJIT. -The current version is LuaJIT 1.1.7. -

-Please check the -» Online Change History -to see whether newer versions are available. -

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LuaJIT 1.1.7 — 2011-05-05

Added fixes for the -» currently known bugs in Lua 5.1.4.

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LuaJIT 1.1.6 — 2010-03-28

Added fixes for the -» currently known bugs in Lua 5.1.4.
Removed wrong GC check in jit_createstate(). -Thanks to Tim Mensch.
Fixed bad assertions while compiling table.insert() and -table.remove().

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LuaJIT 1.1.5 — 2008-10-25

Merged with Lua 5.1.4. Fixes all -» known bugs in Lua 5.1.3.

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LuaJIT 1.1.4 — 2008-02-05

Merged with Lua 5.1.3. Fixes all -» known bugs in Lua 5.1.2.
Fixed possible (but unlikely) stack corruption while compiling -k^x expressions.
Fixed DynASM template for cmpss instruction.

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LuaJIT 1.1.3 — 2007-05-24

Merged with Lua 5.1.2. Fixes all -» known bugs in Lua 5.1.1.
Merged pending Lua 5.1.x fixes: "return -nil" bug, spurious count hook call.
Remove a (sometimes) wrong assertion in luaJIT_findpc().
DynASM now allows labels for displacements and .aword.
Fix some compiler warnings for DynASM glue (internal API change).
Correct naming for SSSE3 (temporarily known as SSE4) in DynASM and x86 disassembler.
The loadable debug modules now handle redirection to stdout -(e.g. -j trace=-).

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LuaJIT 1.1.2 — 2006-06-24

Fix MSVC inline assembly: use only local variables with -lua_number2int().
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.

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LuaJIT 1.1.1 — 2006-06-20

Merged with Lua 5.1.1. Fixes all -» known bugs in Lua 5.1.
Enforce (dynamic) linker error for EXE/DLL version mismatches.
Minor changes to DynASM: faster preprocessing, smaller encoding -for some immediates.

-This release is in sync with Coco 1.1.1 (see the -Coco Change History). -

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LuaJIT 1.1.0 — 2006-03-13

Merged with Lua 5.1 (final).
New JIT call frame setup: -
- The C stack is kept 16 byte aligned (faster). -Mandatory for Mac OS X on Intel, too.
- Faster calling conventions for internal C helper functions.
- Better instruction scheduling for function prologue, OP_CALL and -OP_RETURN.
Miscellaneous optimizations: -
- Faster loads of FP constants. Remove narrow-to-wide store-to-load -forwarding stalls.
- Use (scalar) SSE2 ops (if the CPU supports it) to speed up slot moves -and FP to integer conversions.
- Optimized the two-argument form of OP_CONCAT (a..b).
- Inlined OP_MOD (a%b). -With better accuracy than the C variant, too.
- Inlined OP_POW (a^b). Unroll x^k or -use k^x = 2^(log2(k)*x) or call pow().
Changes in the optimizer: -
- Improved hinting for table keys derived from table values -(t1[t2[x]]).
- Lookup hinting now works with arbitrary object types and -supports index chains, too.
- Generate type hints for arithmetic and comparison operators, -OP_LEN, OP_CONCAT and OP_FORPREP.
- Remove several hint definitions in favour of a generic COMBINE hint.
- Complete rewrite of jit.opt_inline module -(ex jit.opt_lib).
Use adaptive deoptimization: -
- If runtime verification of a contract fails, the affected -instruction is recompiled and patched on-the-fly. -Regular programs will trigger deoptimization only occasionally.
- 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.
- Deoptimization is used for many opcodes and contracts: -
  - OP_CALL, OP_TAILCALL: type mismatch for callable.
  - Inlined calls: closure mismatch, parameter number and type mismatches.
  - OP_GETTABLE, OP_SETTABLE: table or key type and range mismatches.
  - All arithmetic and comparison operators, OP_LEN, OP_CONCAT, -OP_FORPREP: operand type and range mismatches.
- Complete redesign of the debug and traceback info -(bytecode ↔ mcode) to support deoptimization. -Much more flexible and needs only 50% of the space.
- The modules jit.trace, jit.dumphints and -jit.dump handle deoptimization.
Inlined many popular library functions -(for commonly used arguments only): -
- Most math.* functions (the 18 most used ones) -[2x-10x faster].
- string.len, string.sub and string.char -[2x-10x faster].
- table.insert, table.remove and table.getn -[3x-5x faster].
- coroutine.yield and coroutine.resume -[3x-5x faster].
- pairs, ipairs and the corresponding iterators -[8x-15x faster].
Changes in the core and loadable modules and the stand-alone executable: -
- Added jit.version, jit.version_num -and jit.arch.
- Reorganized some internal API functions (jit.util.*mcode*).
- The -j dump output now shows JSUB names, too.
- 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).
- luajit -v prints the LuaJIT version and copyright -on a separate line.
Added SSE, SSE2, SSE3 and SSSE3 support to DynASM.
Miscellaneous doc changes. Added a section about -embedding LuaJIT.

-This release is in sync with Coco 1.1.0 (see the -Coco Change History). -

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LuaJIT 1.0.3 — 2005-09-08

Even more docs.
Unified closure checks in jit.*.
Fixed some range checks in jit.util.*.
Fixed __newindex call originating from jit_settable_str().
Merged with Lua 5.1 alpha (including early bugfixes).

-This is the first public release of LuaJIT. -

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LuaJIT 1.0.2 — 2005-09-02

Add support for flushing the Valgrind translation cache
-(MYCFLAGS= -DUSE_VALGRIND).
Add support for freeing executable mcode memory to the mmap()-based -variant for POSIX systems.
Reorganized the C function signature handling in -jit.opt_lib.
Changed to index-based hints for inlining C functions. -Still no support in the backend for inlining.
Hardcode HEAP_CREATE_ENABLE_EXECUTE value if undefined.
Misc. changes to the jit.* modules.
Misc. changes to the Makefiles.
Lots of new docs.
Complete doc reorg.

-Not released because Lua 5.1 alpha came out today. -

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LuaJIT 1.0.1 — 2005-08-31

Missing GC step in OP_CONCAT.
Fix result handling for C –> JIT calls.
Detect CPU feature bits.
Encode conditional moves (fucomip) only when supported.
Add fallback instructions for FP compares.
Add support for LUA_COMPAT_VARARG. Still disabled by default.
MSVC needs a specific place for the CALLBACK attribute -(David Burgess).
Misc. doc updates.

-Interim non-public release. -Special thanks to Adam D. Moss for reporting most of the bugs. -

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LuaJIT 1.0.0 — 2005-08-29

-This is the initial non-public release of LuaJIT. -

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