RFR: 8304258: x86: Improve the code generation of VectorRearrange with int and float

Wed Mar 22 20:29:41 UTC 2023

On Wed, 22 Mar 2023 18:36:21 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Hi,
>> 
>> This small patch changes the code generation of VectorRearrangeNode with respect to int and float elements. With not-larger-than-128-bit vectors, we can use `vpermilps` instead of promoting to operating on the extended 256-bit vector. This also helps the code generation of AVX1 to not rely on the sse version.
>> 
>> Please take a look and leave some reviews.
>> Thanks a lot.
>
> Please, update to latest JDK sources.

@vnkozlov Currently `VectorRearrange` rejects vectors of length 2 as well as 256-bit vectors on AVX1. As a result, the only type of int/float vectors appearing in AVX1 has a length of 4. This change affects AVX >= 1 machines in int and float vector tests in `test/jdk/jdk/incubator/vector`. Thanks a lot.

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PR Comment: https://git.openjdk.org/jdk/pull/13042#issuecomment-1480217453