RFR: 8223454: Reduce String concatenation shapes by folding initialLengthCoder into last mixer

[Claes Redestad]

Thanks Jim!

/Claes

On 2019-05-09 13:47, Jim Laskey wrote:
> +1
> 
> 
>> On May 8, 2019, at 11:49 AM, Claes Redestad <claes.redestad at oracle.com> wrote:
>>
>> Hi,
>>
>> yet another String concat startup/footprint optimization.
>>
>> As the subject implies, we could fold the initialLengthCoder it into the
>> final mixer. This way we end up with one less bound argument into the
>> larger method handle combinator tree, with fewer species classes and
>> lambda forms generated as a result. This means a significant speed-up on
>> several startup and footprint tests, and especially noticeable on
>> realistic workloads that just have a few different small concat shapes.
>>
>> Bug:    https://bugs.openjdk.java.net/browse/JDK-8223454
>> Webrev: http://cr.openjdk.java.net/~redestad/8223454/open.00/
>>
>> Thanks!
>>
>> /Claes
>