[PATCH] D134168: [RISCV] Make preferred alignment of PointerArgs for MemIntrinsic

[Jiejie Rong via Phabricator via llvm-commits]

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Set default preferred alignment for MemIntrinsic like memcpy according to arch32 or arch64,
it will improve performance.

e.g. dhrystone with "-O2" boosts performance by 50% on arch RV32.


https://reviews.llvm.org/D134168

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/test/CodeGen/RISCV/memcpy-align.ll
  llvm/test/CodeGen/RISCV/memcpy-inline.ll

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