RFR: 8317795: Add an ImmutableBitSetPredicate variant for bitsets <= 128 elements

[Roger Riggs]

On Sun, 8 Oct 2023 21:02:25 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> Alternative to #16082
> 
> Name                             (unchanged) Cnt  Base   Error   Test   Error  Unit  Change
> URLEncodeDecode.testEncodeLatin1           0  15 2,066 ± 0,104  1,899 ± 0,007 ms/op   1,09x (p = 0,000*)
> URLEncodeDecode.testEncodeLatin1          75  15 0,934 ± 0,017  0,811 ± 0,014 ms/op   1,15x (p = 0,000*)
> URLEncodeDecode.testEncodeLatin1         100  15 0,433 ± 0,060  0,389 ± 0,007 ms/op   1,11x (p = 0,008*)
>   * = significant
>   ```

Looks good

test/jdk/java/util/BitSet/ImmutableBitSet.java line 65:

> 63:     @Test
> 64:     void basic() {
> 65:         IntStream.of(0, 16, 143, 4711).forEach(k -> basic(k));

A test on either side of the boundary (128) in the implementation might be useful.

-------------

Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16094#pullrequestreview-1667771776
PR Review Comment: https://git.openjdk.org/jdk/pull/16094#discussion_r1352558216