Re: Possible bug in MS_ASMTRICK? (Lua 5.2)

[KHMan <keinhong@...>]

On 4/23/2013 6:25 AM, Henk Boom wrote:
> On 22 April 2013 04:01, KHMan wrote:
> > I have a feeling that this has already been addressed in LuaJIT...
>
> LuaJIT defines the semantics in the same way:
>
> http://bitop.luajit.org/semantics.html
>
> "Non-integral numbers may be rounded or truncated in an
> implementation-defined way. This means the result could differ between
> different BitOp versions, different Lua VMs, on different platforms or
> even between interpreted vs. compiled code (as in LuaJIT).
> Avoid passing fractional numbers to bitwise functions. Use
> math.floor() or math.ceil()to get defined behavior."

I apologize profusely for not making myself precisely clear there.

I meant that one can probably find the fastest x86 instructions 
for type conversion/floor/trunc related operations within the 
LuaJIT sources, in this case, see the section marked by "-- Type 
conversions --" in lj_asm_x86.h...

--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia