RFR: 8370691: Add new Float16Vector type and enable intrinsification of vector operations supported by auto-vectorizer

[Paul Sandoz]

On Wed, 12 Nov 2025 07:59:38 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> > > Some quick comments.
> > > We should be consistent in the naming, and rename `Halfloat*` to `Float16*`.
> > 
> > 
> > I concur, especially since there are multiple 16-bit floating-point formats in use including the IEEE 754 float16 as well as bfloat16.
> 
> There are nomenclature issues that I am facing. Currently, all the Float16 concrete classes use the Halffloat prefix i.e., Halffloat64Vector, Halffloat128Vector; converting these to Float16 looks a little confusing, i.e., Float1664Vector, Float16128Vector, etc Kindly suggest a better name to represent these classes.

Maybe we move the shape to the end e.g., `Float16Vector128`, `IntVector128`, `IntVectorMax`?

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PR Comment: https://git.openjdk.org/jdk/pull/28002#issuecomment-3523631727