[PATCH] D132359: [LegalizeTypes] Support widen result for VECTOR_REVERSE

[WangLian via Phabricator via llvm-commits]

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Support widen result for VECTOR_REVERSE.
After widen and reverse, extract real value and fill undef value in the tail to build a new vector.

I am not sure if I should add widen vector_reverse result for fixed-vectors, because when I use `llvm.experimental.vector.reverse` for fixed-vectors it will become to vector_shuffle ISD node.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132359

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
  llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
  llvm/test/CodeGen/RISCV/rvv/named-vector-shuffle-reverse.ll

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