On Thu, 22 Sep 2022 12:56:49 GMT, Aleksei Voitylov <avoity...@openjdk.org>
wrote:
> Unlike on x86 (see 8285868 and the discussion in review), isFinite intrinsic
> turned out to be profitable on RISC-V using the same fclass instruction as
> for 8293695 (isInfinite instrinsic). Therefore, I'm proposing to have it
> added on RISC-V in this PR.
>
> benchmark results:
>
> before:
>
> Benchmark Mode Cnt Score Error Units
> DoubleClassCheck.testIsFiniteBranch avgt 15 52.824 ± 1.744 ns/op
> DoubleClassCheck.testIsFiniteCMov avgt 15 16.104 ± 0.358 ns/op
> DoubleClassCheck.testIsFiniteStore avgt 15 14.366 ± 2.174 ns/op
> FloatClassCheck.testIsFiniteBranch avgt 15 49.821 ± 0.330 ns/op
> FloatClassCheck.testIsFiniteCMov avgt 15 14.702 ± 0.335 ns/op
> FloatClassCheck.testIsFiniteStore avgt 15 14.749 ± 0.496 ns/op
>
> after:
>
> DoubleClassCheck.testIsFiniteBranch avgt 15 48.921 ± 0.557 ns/op
> DoubleClassCheck.testIsFiniteCMov avgt 15 13.716 ± 0.304 ns/op
> DoubleClassCheck.testIsFiniteStore avgt 15 9.152 ± 0.158 ns/op
> FloatClassCheck.testIsFiniteBranch avgt 15 47.740 ± 2.028 ns/op
> FloatClassCheck.testIsFiniteCMov avgt 15 13.299 ± 0.282 ns/op
> FloatClassCheck.testIsFiniteStore avgt 15 9.185 ± 0.396 ns/op
>
> Existing isInfinite jtreg test was altered to be able to use common code for
> isFinite test and fine-grained requires tag filtering. Existing benchmark was
> modified to include isFinite case. A typo ("Atleast" -> "At least") was fixed
> on the way.
>
> Test passed on both release and fastdebug builds. Hotspot tier1 tests were
> run on x86_64 and RISC-V with no issues.
@vnkozlov could you or someone familiar with C2 look at shared C2 HotSpot
changes? I did test it on x86, but any extra testing could help as well.
-------------
PR: https://git.openjdk.org/jdk/pull/10391
