On Wed, 20 Apr 2022 00:25:26 GMT, Paul Sandoz <psan...@openjdk.org> wrote:
> I am yet to be convinced we a 3rd vector right shift operator. We are talking > about narrow cases of correct use which i believe can be supported with the > existing operators. The user needs to think very careful when deviating from > common right shift patterns on sub-words, which when deviated from can often > imply misunderstanding and incorrect use, or an obtuse use. I would prefer to > stick the existing operators and clarify their use. As we can see, `VectorOperators` has directly supported all the unary/binary scalar operators in the Java language except for `>>>`. So it seems strange not to support `>>>` directly. Since you are a Vector API expert, you know the semantics of `LSHR` precisely. But for many Java developers, things are different. I'm afraid most of them don't know Vector API actually has extended semantics of `>>>` upon bytes/shorts with `LSHR`. To be honest, I didn't know it before my customer's bug even though I had spent enough time reading the Vector API doc. This is because for ordinary developers, they are only familiar with the common scalar `>>>`. So it seems easy to write bugs with the only `LSHR`, which is different with `>>>`. >From the developer's point of view, I strongly suggest providing the `>>>` >operator in Vector API. Not only because `>>>` is one of the basic operators in Java language, but also we can make it to be more friendly to so many ordinary developers. Thanks. ------------- PR: https://git.openjdk.java.net/jdk/pull/8276
