[PATCH] D154691: [RISCV] Implemnt prefetch locality by NTLH

[Piyou Chen via Phabricator via llvm-commits]

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We add the MemOperand then backend will generate NTLH automatically.

__builtin_prefetch(ptr,  0 /* rw==read */, 0 /* locality */); => ntl.all + prefetch.r (ptr)
__builtin_prefetch(ptr,  0 /* rw==read */, 1 /* locality */); => ntl.pall + prefetch.r (ptr)
__builtin_prefetch(ptr,  0 /* rw==read */, 2 /* locality */); => ntl.p1 + prefetch.r (ptr)
__builtin_prefetch(ptr,  0 /* rw==read */, 3 /* locality */); => prefetch.r (ptr)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154691

Files:
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
  llvm/test/CodeGen/RISCV/prefetch.ll

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