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

[Robert Köpferl]

Sorry, but may I know what you're discussing about?

Seems to me like how to implement the page address translation on a MIPS
machine.

Royce Mitchell III wrote:
> Rick Parrish wrote:
> 
>> Couldn't you just take the binary log and round down? Okay ... just 
>> kidding.
>>
>> Seriously, I think Mark had the right idea ... if you use a smaller 
>> table. This is similar to some ECC code I use for counting the number 
>> of 1's in a word. Removing the while() loop is left "as an exercise 
>> for the reader" ...
>>
>> static const unsigned char list[16] = {0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 
>> 4, 4, 4, 4, 4, 4};
>>
> I have experimented with both 16 and 256 entry tables. 16 = somewhat 
> slower than no tables, 256 = somewhat faster than no tables, but both of 
> those results are based on the code and tables getting cached. I don't 
> anticipate our particular target benefiting from cache coherency... it 
> runs very frequently, but not in a tight loop.
> 
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