[PATCH] D152019: [RISCV][CostModel] Model vrgather.vv as being quadradic in LMUL

[Philip Reames via Phabricator via llvm-commits]

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vrgather.vv across multiple vector registers (i.e. LMUL > 1) requires all to all data movement.  Currently we model these as being linear in LMUL, which seems questionable.

Noticed via code inspection while looking at something else.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152019

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

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