RFR: 8245677: Optimize lookups in empty HashMap

[Roger Riggs]

+1,

Looks fine.

Should the benchmark be included?

Thanks, Roger


On 5/25/20 8:12 AM, Jim Laskey wrote:
> +1
>
> (Copyright date)
>
>> On May 25, 2020, at 7:02 AM, Claes Redestad <claes.redestad at oracle.com> wrote:
>>
>> Hi,
>>
>> sponsoring this patch from Christoph Dreis.
>>
>> By pushing down the hash calculation we can optimize lookups
>> in empty HashMaps (also helps LinkedHashMap).
>>
>> Bug:    https://bugs.openjdk.java.net/browse/JDK-8245677
>> Webrev: http://cr.openjdk.java.net/~redestad/8245677/open.00/
>>
>> Testing: tier1+2
>>
>> Original report: https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-May/066530.html
>>
>> /Claes