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. > > 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-b15](https://github.com/openjdk/jdk/releases/tag/jdk-25%2B15) as the > baseline version. > > For performance data collected with the built in **cbrt** micro-benchmark, > see the table below. Each result is the mean of 8 individual runs. Overall, > the intrinsic provides a performance uplift of 41%. > > | Benchmark | Throughput with baseline (op/s) | Throughput with > intrinsic (op/s) | Speedup | > | :----------------: | :----------------------------------: | > :----------------------------------: | :---------: | > | MathBench.cbrt | 148242 | 209122 > | 1.41x | > > Finally, the `jtreg:test/jdk/java/lang/Math/CubeRootTests.java` test passed > with the changes. What are the monotonicity and accuracy results for this approximation? Is it correctly rounded or faithfully rounded? ------------- PR Comment: https://git.openjdk.org/jdk/pull/24470#issuecomment-2832008455
