[PATCH] D137276: [RISCV] Add cost model for fixed broadcast shuffle

[ShihPo Hung via Phabricator via llvm-commits]

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This patch adds basic broadcast shuffle costs in order to enable SLP vectorization.
And adds `getLMULCost` to consider reciprocal throughput for different LMUL.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137276

Files:
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
  llvm/test/Analysis/CostModel/RISCV/fixed-shuffle-broadcast.ll

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