[jdk19] RFR: 8287794: Reverse*VNode::Identity problem

[Vladimir Kozlov]

On Fri, 22 Jul 2022 17:24:04 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> Hi All,
> 
> - This bug fix patch fixes a missing case during reverse[bits|bytes] identity transformation.
> - Unlike AARCH64(SVE),  X86(AVX512) ISA has no direct instruction to reverse[bits|bytes] of a vector lane hence a predicated operation is supported through blend instruction.
> - New IR framework based tests have been added for transforms relevant to AVX2, AVX512 and SVE.
> 
> Kindly review and share your feedback.
> 
> Best Regards,
> Jatin

This is P4 bug and we are in phase 2 for JDK 19 release. The bug's fix version is JDK 20.
Please, create new PR based on latest JDK and not JDK 19. We can later backport it into JDK 19 update release.

-------------

Changes requested by kvn (Reviewer).

PR: https://git.openjdk.org/jdk19/pull/153