[PATCH] D151103: [RISCV] Scalarize small fixed vector copies < XLEN

[Luke Lau via Phabricator via llvm-commits]

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For small fixed-length vector copies like
vsetivli   zero, 2, e16, m1, ta, ma
vle16.v    v8, (a0)
vse16.v    v8, (a1)

We can scalarize them if the total vector size < XLEN:
lw a0, 0(a0)
sw a0, 0(a1)

This patch adds a DAG combine to do so, reusing much of the existing
logic in https://reviews.llvm.org/D150717


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151103

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-load-store.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-mask-load-store.ll

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