On Sat, 5 Apr 2025 05:30:25 GMT, Shaojin Wen <s...@openjdk.org> wrote:
>> Improve the performance of UUID::toString by using Long.expand and SWAR >> (SIMD within a register) instead of table lookup. Eliminating the table >> lookup can also avoid the performance degradation problem when the cache >> misses. > > Shaojin Wen has updated the pull request incrementally with one additional > commit since the last revision: > > simplify code https://github.com/wenshao/jdk/tree/optim_uuid_to_string_202501_x2 I also made a version that does not use ByteArrayLittleEndian, but the performance drops by 5% to 10%. By printing the igv file through PrintIdealGraph, I found that the RangeCheck of array access is not eliminated. [pr_22928_igv.zip](https://github.com/user-attachments/files/19640905/pr_22928_igv.zip) ------------- PR Comment: https://git.openjdk.org/jdk/pull/22928#issuecomment-2784980276
