Re: and/or missbehaviour in embedded lua 5.1
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- Subject: Re: and/or missbehaviour in embedded lua 5.1
- From: Kein-Hong Man <mkh@...>
- Date: 2006年3月16日 01:38:11 +0800
Hi all,
Andreas Stenius wrote:
D Burgess skrev:
[snip]
lua_number2int
If you have lrint() use it.
while you are at it, check on.
lua_str2number(s,p)
DB
Thanks, I've looked at it. But I can't see how this can be from a bad
setup in luaconf.
Since the and/or construct works when used with variable lookups, example:
> =false or 1
1.0890312344636e-60
> i = 1
> =i
1
> =false or i
1
>
Your sample:
local a = true and 0
on Lua 5.1/cygwin gives 0. It compiles to:
[1] loadk 0 0 ; 0
[2] return 0 1
But on your platform, 1.0890312344636e-60 is however,
E0FFFFFF05007C33 hex, and the first 4 bytes looks *very*
suspicious to me.
But:
local a = true or 0
is not optimized to a LOADK. It compiles to:
[1] jmp 3 ; to [5]
[2] loadk 0 0 ; 0
[3] jmp 2 ; to [6]
[4] loadbool 0 0 1 ; false, to [6]
[5] loadbool 0 1 0 ; true
[6] return 0 1
Looks like some kind of optimization thingy barfed on you. :-)
--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia