RFR 8209171 : Simplify Java implementation of Integer/Long.numberOfTrailingZeros()

[Ivan Gerasimov]

Thanks Martin!


On 8/9/18 5:42 PM, Martin Buchholz wrote:
>
>
> On Thu, Aug 9, 2018 at 5:27 PM, Ivan Gerasimov 
> <ivan.gerasimov at oracle.com <mailto:ivan.gerasimov at oracle.com>> wrote:
>
>     I did not use the intrinsified variants of numberOfLeadingZeros in
>     the benchmark.
>
>
> Oops! Should have looked more closely!
> Did you know about
> http://www.hackersdelight.org/hdcodetxt/ntz.c.txt

Ah, right, ntz1() is even better because it has less branches.  How 
could I miss that?

Here's the updated webrev and benchmarks:

http://cr.openjdk.java.net/~igerasim/8209171/01/webrev/
http://cr.openjdk.java.net/~igerasim/8209171/01/bench/int/MyBenchmark.java
http://cr.openjdk.java.net/~igerasim/8209171/01/bench/long/MyBenchmark.java

-- 
With kind regards,
Ivan Gerasimov