Re: [ros-dev] ping Alex regarding log2() for scheduler

[Royce Mitchell III]

Magnus Olsen wrote:
> Hi I have not test run this code. But i think this form maby 
> are faster that v3 of  Royce  Mitchell III code 
> it leave to the compiler to optimze it more or I complete wrong
>
> int highest_bit ( unsigned int i )
> {
>     int ret = 0;
>     int n ;
>     int t;
>     int x;
>
> for (t = 0; t>3;t++)
>   {
>      x = (16 << t);
>      n = i >> x;
>     if ( n )  i = n, ret  += x ;
>   }
>      return ret + (i>>1);
> }

Magnus,

Well... I was skeptical at first....

Your code is indeed faster, but it is not outputting correct results, so 
if you can tweak it to output correct results without sacrificing speed 
I will indeed be impressed!

/me crosses fingers ;)

Royce3