On Thu, 8 Jul 2021 15:34:16 GMT, Brian Burkhalter <b...@openjdk.org> wrote:

>> Please consider this change to make the `float` and `double` versions of 
>> `java.lang.Math.abs()` branch-free.
>
> Brian Burkhalter has refreshed the contents of this pull request, and 
> previous commits have been removed. The incremental views will show 
> differences compared to the previous content of the PR.

src/java.base/share/classes/jdk/internal/math/DoubleConsts.java line 80:

> 78:      * significand fields) of a {@code double}.
> 79:      */
> 80:     public static final long    MAG_BIT_MASK = 0x7FFFFFFFFFFFFFFFL;

Might be more "obviously correct" if these new fields were initialized as 
~SIGN_BIT_MASK.

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PR: https://git.openjdk.java.net/jdk/pull/4711

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