[all-commits] [llvm/llvm-project] 861489: [NFC][RISCV] Enable TuneNoDefaultUnroll feature to...

[Zi Xuan Wu (Zeson) via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 861489af1b4947a107e501e39bafb4f2785456cb
      https://github.com/llvm/llvm-project/commit/861489af1b4947a107e501e39bafb4f2785456cb
  Author: Zi Xuan Wu (Zeson) <zixuan.wu at linux.alibaba.com>
  Date:   2022-05-19 (Thu, 19 May 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCV.td
    M llvm/lib/Target/RISCV/RISCVSubtarget.h
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp

  Log Message:
  -----------
  [NFC][RISCV] Enable TuneNoDefaultUnroll feature to control targets which use default unroll preference

In RISCVTargetTransformInfo, enumerating the processor family is not a good way to predict.
Because it needs to enumerate many subtarget family and is hard to update if add new subtarget.
Instead, create a feature to distinguish whether targets want to use default unroll preference or not.

Keep TuneSiFive7 because it's flag to indicate subtarget family, which may used in other place.

Differential Revision: https://reviews.llvm.org/D125741