[PATCH] D153358: [RISCV] Fold vmv.v.v across different subregister classes

[Luke Lau via Phabricator via llvm-commits]

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A common pattern is that a vector op will be copied into a smaller subregister
class and then inserted into another vector with vmv.v.v.  This extends the
vmv.v.v combine to handle such cases by peeking through the COPY_TO_REGCLASS
nodes and updating the result type.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153358

Files:
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-calling-conv.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-extload-truncstore.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-extract-subvector.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-setcc.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-insert-subvector-shuffle.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-insert-subvector.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-mask-splat.ll
  llvm/test/CodeGen/RISCV/rvv/insert-subvector.ll

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