On 03/05/2010 12:26 PM, Eric Blake wrote:
> According to Chris Lalancette on 3/5/2010 10:03 AM:
>> +static int popcnt(char x)
>> +{
>> + char count;
>> + for (count = 0; x; count++)
>> + x &= x-1;
>> + return count;
>> +}
>
> Gnulib provides the count-one-bits module, which does this much more
> efficiently (via a gcc builtin, when available; otherwise without any
> branching in the assembly).
I knew this wasn't the most efficient way to do it, but performance here
doesn't really matter. If gnulib has a module for it, though, I'll use
that instead.
Thanks,
--
Chris Lalancette
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