Withdrawn: 8341102: Add element type information to vector types

[duke]

On Fri, 27 Sep 2024 18:06:36 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Hi,
> 
> This patch adds the type information of each element in a `TypeVect`. This helps constant folding vectors as well as strength reduction of several complex operations such as `Rearrange`. Some notable points:
> 
> - I only implement `ConV` rule on x86, looking at other architectures it seems that I would not only need to implement the `ConV` implementations, but several other rules that match `ReplicateNode` of a constant.
> - I changed the implementation of an array constant in `constanttable`, I think working with `jbyte` is easier as it allows `memcpy` and at this point, we are close to the metal anyway.
> - Constant folding for a `VectorUnboxNode`, this is special because an element of a normal stable array is only constant if it is non-zero, so implementing constant folding on a load node seems less trivial.
> - Memory fences because `Vector::payload` is a final field and we should respect that.
> - Several places expect a `const Type*` when in reality it expects a `BasicType`, I refactor that so that the intent is clearer and there is less room for possible errors, this is needed because `byte`, `short` and `int` share the same kind of `const Type*`.
> 
> Please take a look and leave your reviews, thanks a lot.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/21229