On Tue, 25 Oct 2022 23:13:08 GMT, Vladimir Ivanov <vliva...@openjdk.org> wrote:
> …very modest impact while still being able to catch important types of MXCSR > corruption. I fully support having it turned on by default for JNI calls. I guess I agree. With the clever test for the bad mode Java cares about, the overhead is small compared to an empty JNI call, and very small compared to any normally non-empty JNI call. Now I'm curious: What's this magic code? Does it multiply a couple of well-chosen constants and test for zero? I said "I guess" because I'm not clear on (a) the benefit of adding that nanosecond (other than preserving denorms against a rare system fault), nor on (b) what are the remaining faults not checked for, but which a more expensive MSR spill/restore would fix. ------------- PR: https://git.openjdk.org/jdk/pull/10661
