lua 5.1.1 patch for bitwise operators

Hello,

This patch introduces bitwise operators to lua_Number. It was porting/extending Doug Rogers’ patch for lua 5.1.1.

Here are the operators (metaoperator):

A|B : or (__bor)

A&B : and

A^|B : xor, (__band) Doug was using #, because ^ is used for power, I preferred to define a 2 signs token closer to usual notation

A<<s: left shift, (__blshift)

B>>s: right shift, (__brshift)

~A : not, (__bnot)

It isn’t backward compatible with lua because it introduced some new opcodes.

To disable these operators, just turn off LUA_BITWISE_OPERATORS in luaconf.h and you are back to standard lua.

Well, it also includes the patch for direct threaded code in virtual machine for gcc, which isn’t enabled on x86, and can be discarded in luaconf.h

% uname -a

Linux 2.4.21-37.ELsmp #1 SMP Wed Sep 7 13:28:55 EDT 2005 i686 i686 i386 GNU/Linux

%gcc --version

gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-53)

Copyright (C) 2002 Free Software Foundation, Inc.

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[lua-5.1.1 ] % size src/lua

text data bss dec hex filename

114770 644 16 115430 1c2e6 src/lua

[lua-5.1.1 ] % size src/luac

text data bss dec hex filename

78504 456 16 78976 13480 src/luac

[lua-5.1.1.patched ] % size src/lua

text data bss dec hex filename

117330 644 16 117990 1cce6 src/lua

[lua-5.1.1.patched ] % size src/luac

text data bss dec hex filename

81140 456 16 81612 13ecc src/luac

So the overhead is roughly 2,5Ko

I post it here for Comments/Suggestion (how to check the boundaries, …)/Deeper testing…

And would be interested to know if something similar would be included in lua 5.2…

Thierry