On Nov 18, 2021, at 2:41 AM, kabutz <d...@openjdk.java.net<mailto:d...@openjdk.java.net>> wrote:
Yes, it **must** be opt-in. However I'm not sure that a tuning knob will be necessary. BigInteger has thresholds for using different multiply algorithms and these are also not configurable. Those thresholds are the result of *many* JMC runs on multiple platforms. That said, there is an issue on file to reevaluate them someday [1]. [1] https://bugs.openjdk.java.net/browse/JDK-8029425
