Re: [ANN] Lua BitOp 1.0.0 released

[Doug Currie <doug.currie@...>]

Hi Mike,

On Dec 17, 2008, at 10:12 AM, Mike Pall wrote:
> The hope is that with Lua 5.2 we get a "bit" library in the core
> distribution. Consider the Lua BitOp docs, and in particular the
> section on operational semantics and rationale as my contribution
> to this effort.


Thank you.

I notice that you use ((SBits)b >> n) to implement bit.arshift. C89  
and C99 don't specify how signed right shifts are performed; it is  
"implementation-defined behavior." It seems that to insure the  
operational semantics you specify, either a more robust implementation  
for arshift is needed (as in my Plea at http://lua-users.org/wiki/BitwiseOperators) 
 or at least an arshift test should be added at initialization.

e