[PATCH] D145495: [RISCV] Lower vector_{interleave,deinterleave} for NF > 2

[Luke Lau via Phabricator via llvm-commits]

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For NF > we can't use the same tricks we use for the NF == 2 case, so
instead we're just generalizing the vrgather paths.

This also handles the re-concatenation of vectors a bit differently now,
as it's possible to get operands of a valid type but end up with a
result type that's invalid, e.g. nx2vi32 * 3 -> nx6vi32. Now we extend
the vector to the next power of two in the hopes that it's valid, e.g.
nxv8i32.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145495

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/vector-deinterleave.ll
  llvm/test/CodeGen/RISCV/rvv/vector-interleave.ll

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