[jdk19] RFR: 8288112: C2: Error: ShouldNotReachHere() in Type::typerr() [v4]

[Jatin Bhateja]

> [JDK-8284960](https://bugs.openjdk.org/browse/JDK-8284960) added new vector IR nodes and target specific backend support for  ReverseByte vector operations.  
> For each scalar operation, auto-vectorizer analysis stage checks for existence of vector IR opcode and target specific backend implementation.  While processing scalar IR nodes corresponding to Java SE APIs [Short/Character/Integer/Long].reverseBytes SLP analysis checks passes since relevant support already existed. This bug fix patch handles missing scalar reversebyte opcode checks in SLP backed to enable creation of corresponding vector IR nodes.
> 
> A new JBS issue [JDK-8290034](https://bugs.openjdk.org/browse/JDK-8290034) is created to add the missing auto-vectorization support for bit reverse operation targeting JDK mainline.
> 
> Kindly review and share your feedback.
> 
> Best Regards,
> Jatin

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  8288112: Minor adjustment to benchmark.

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

Changes:
  - all: https://git.openjdk.org/jdk19/pull/128/files
  - new: https://git.openjdk.org/jdk19/pull/128/files/d3556cbb..43bfa40d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=128&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=128&range=02-03

  Stats: 4 lines in 2 files changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk19/pull/128.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/128/head:pull/128

PR: https://git.openjdk.org/jdk19/pull/128