[PATCH] D119316: [RISCV] Add a really basic cost model for SK_Splice.

[Craig Topper via Phabricator via llvm-commits]

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While testing scalable vectors I found that if we generate a
vector splice intrinsic and run the code through the loop unroller,
we'll crash due to an invalid cost.

This adds a basic cost based on the 2 slide instructions used by the
lowering in D119303 <https://reviews.llvm.org/D119303>.

We probably need to factor LMUL into this, but that's true for
arithmetic instructions too. So I've ignored for the moment.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119316

Files:
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
  llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
  llvm/test/Analysis/CostModel/RISCV/splice.ll
  llvm/utils/update_analyze_test_checks.py

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