RFR: 8318678: Vector access on heap MemorySegments only works for byte[]

[Maurizio Cimadamore]

On Wed, 25 Oct 2023 13:08:06 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes removing the restriction that only heap `MemorySegment` wrapping a `byte` array can be accessed by Vectors. Now any array type can be used provided the element alignment constraints are respected.

src/jdk.incubator.vector/share/classes/jdk/incubator/vector/ByteVector.java line 3284:

> 3282:      *         for any lane {@code N} in the vector
> 3283:      * @throws IllegalArgumentException if the memory segment is a heap segment that is
> 3284:      *         not backed by a {@code byte[]} array and if access to the backing array

This seems backwards - e.g. a ByteVector requires an alignment of 1. So I would expect to be able to pass _any_ segment?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16360#discussion_r1371810795