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

[Royce Mitchell III]

Mike Nordell wrote:

>  int highest_bit(unsigned int i)
> {
>     int temp;
>     int ret = 0;
>     temp = i > 0xffff; i >>= 16*temp; ret = 16*temp;
>     temp = i > 0xff;   i >>=  8*temp; ret += 8*temp;
>     temp = i > 0xf;    i >>=  4*temp; ret += 4*temp;
>     temp = i > 0x3;    i >>=  2*temp; ret += 2*temp;
>     ret += (i>>1);
>     return ret;
> }
>   
>  
This is almost, but not quite, 50% slower in msvc6 w/ "compile for 
speed". :(

Perhaps the reordering could help...