[PATCH] D143578: [VP] Add vp.powi and a pass for expanding vp.powi before DAG.

[Yeting Kuo via Phabricator via llvm-commits]

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The patch uses different expanding way for vp.powi from the method of powi.
Vector powi is unrolled to multiple powi() libary calls in SelectionDAG, but the
method is not work for scalable vectors.
To support scalable vectors, the patch expands vp.powi at IR level. The
expanding way of vp.powi is based on compiler-rt/__powidf2.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143578

Files:
  llvm/include/llvm/CodeGen/MachinePassRegistry.def
  llvm/include/llvm/CodeGen/Passes.h
  llvm/include/llvm/IR/Intrinsics.td
  llvm/include/llvm/IR/VPIntrinsics.def
  llvm/include/llvm/InitializePasses.h
  llvm/lib/CodeGen/CMakeLists.txt
  llvm/lib/CodeGen/ExpandPowi.cpp
  llvm/lib/CodeGen/TargetPassConfig.cpp
  llvm/tools/opt/opt.cpp

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