RFR: 8236850: Operations on constant List/Set.of(element) instances does not consistently constant fold

[Roger Riggs]

Hi Claes,

Looks fine.

ImmutableCollections.java: 418  looks like an extra blank line

Thanks, Roger


On 1/10/20 12:01 PM, Claes Redestad wrote:
> Hi,
>
> this patch ensures operations on constant (static final) single-element
> lists and sets created via List.of(foo) and Set.of(bar) to constant fold
> properly.
>
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8236850
> Webrev: http://cr.openjdk.java.net/~redestad/8236850/open.00
>
> On micros that are set up to test constant folding, e.g.
> sumSizesFinalList, we see improvements around 10-15%.
>
> I also cleaned up and consolidated the heap archiving interaction a
> notch. It was needed in an earlier prototype version of the patch, but
> no longer.. since it's a cleanup I kept the changes.
>
> Testing: tier1-3
>
> Thanks!
>
> /Claes