RFR: JDK-8302040: Port fdlibm sqrt to Java [v5]

[Tobias Hartmann]

On Mon, 27 Feb 2023 18:26:51 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> The wheel of FDLIBM porting turns a notch and sqrt comes into play.
>> 
>> While the sqrt operation usually has a hardware implementation that is intrinsified, for completeness a software implementation should be available as well.
>
> Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
> 
>  - Enable intrinsic for StrictMath.sqrt; thanks to Tobias Hartmann for assistance with the HotSpot updates.
>  - Merge branch 'master' into JDK-8302040
>  - Implement review feedback.
>  - Add one one unsigned shift comment.
>  - Respond to review feedback.
>  - JDK-8302040: Port fdlibm sqrt to Java

Hotspot changes look good to me.

-------------

Marked as reviewed by thartmann (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12736