[all-commits] [llvm/llvm-project] 4c68de: [RISCV][CostModel] Add cost model for experimental...

[Min-Yih Hsu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4c68de5a0027fca9ebff5f8ffec3a35a43d14e74
      https://github.com/llvm/llvm-project/commit/4c68de5a0027fca9ebff5f8ffec3a35a43d14e74
  Author: Min-Yih Hsu <min.hsu at sifive.com>
  Date:   2024-05-14 (Tue, 14 May 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.h
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/cttz_elts.ll

  Log Message:
  -----------
  [RISCV][CostModel] Add cost model for experimental.cttz.elts (#91778)

The cost of `experimental.cttz.elts` in RISC-V equals to the cost of
vfirst when the zero_is_poison argument is true. Otherwise, we add
additional costs of cmp + select to convert the -1 result from vfirst to
EVL.



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