[all-commits] [llvm/llvm-project] 7c128f: CostModel/RISCV: tweak cost of vector ctpop under ...

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c128f6d0e358ccf4332426b829e8f2eef9adacb
      https://github.com/llvm/llvm-project/commit/7c128f6d0e358ccf4332426b829e8f2eef9adacb
  Author: Ramkumar Ramachandra <Ramkumar.Ramachandra at imgtec.com>
  Date:   2023-09-27 (Wed, 27 Sep 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/int-bit-manip.ll

  Log Message:
  -----------
  CostModel/RISCV: tweak cost of vector ctpop under ZVBB (#67020)

Under RISCV experimental-zvbb, vector variants of llvm.ctpop lower to a
single instruction: vcpop. The cost-model does not check for the ZVBB
extension, and always associates a high cost to vector variants of
llvm.ctpop. Fix this defect.