[PATCH] D157299: [RISCV] Use vmv.s.x for a constant build_vector when the entire size is less than 32 bits

[Philip Reames via Phabricator via llvm-commits]

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We have a variant of this for splats already, but hadn't handled the case where a single copy of the wider element can be inserted producing the entire required bit pattern.  This shows up mostly in very small vector shuffle tests.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157299

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-interleave.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-vslide1up.ll

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