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