Hi Paul, I think compiler-dev hotspot list would be adequate. Coincidentally, John Rose mentioned ffs (find first bit set) ops just recently and gave an interesting link to all sorts of implementations:
http://markmail.org/message/siucbahtw2jzblzl Dawid On Thu, Nov 6, 2014 at 5:18 PM, Paul Elschot <[email protected]> wrote: > Dear all, > > For LUCENE-6040 it would be good to have better processor support for > selecting the i-th set bit from a 64-bit integer. > > Not too long ago Long.bitCount() was intrinsified in JVM's. > > I hope something similar will happen to a select(long x, int i) > method. However, better processor support is needed first. > > This is somewhat off topic here, but does anyone know how to request > better processor support for select operations? > > > Regards, > Paul Elschot > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
