On Sun, 6 Apr 2025 03:48:22 GMT, Mohamed Issa <d...@openjdk.org> wrote:
> The goal of this PR is to implement an x86_64 intrinsic for > java.lang.Math.cbrt() using libm. There is a new set of micro-benchmarks are > included to check the performance of specific input value ranges to help > prevent regressions in the future. > > The command to run all range specific micro-benchmarks is posted below. > > `make test TEST="micro:CbrtPerf.CbrtPerfRanges"` > > The results of all tests posted below were captured with an [Intel® Xeon > 6761P](https://www.intel.com/content/www/us/en/products/sku/241842/intel-xeon-6761p-processor-336m-cache-2-50-ghz/specifications.html) > using [OpenJDK > v25-b21](https://github.com/openjdk/jdk/releases/tag/jdk-25%2B21) as the > baseline version. > > For performance data collected with the new built in range micro-benchmark, > see the table below. Each result is the mean of 8 individual runs, and the > input ranges used match those from the original Java implementation. Overall, > the intrinsic provides a major uplift of 169% when very small inputs are used > and a more modest uplift of 45% for all other inputs. > > | Input range(s) | Baseline throughput > (ops/ms) | Intrinsic throughput (ops/ms) | Speedup | > | :-------------------------------------: | :-------------------------------: > | :-------------------------------: | :---------: | > | [-2^(-1022), 2^(-1022)] | 6568 > | 17678 | 2.69x | > | (-INF, -2^(-1022)], [2^(-1022), INF) | 138932 > | 200897 | 1.45x | > > Finally, the `jtreg:test/jdk/java/lang/Math/CubeRootTests.java` test passed > with the changes. This pull request has now been integrated. Changeset: 0df8c968 Author: Mohamed Issa <mohamed.i...@intel.com> Committer: Sandhya Viswanathan <sviswanat...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/0df8c9684b8782ef830e2bd425217864c3f51784 Stats: 649 lines in 27 files changed: 637 ins; 1 del; 11 mod 8353686: Optimize Math.cbrt for x86 64 bit platforms Reviewed-by: sviswanathan, sparasa, jbhateja ------------- PR: https://git.openjdk.org/jdk/pull/24470
