[all-commits] [llvm/llvm-project] f5f4da: [RISCV] Don't vectorize for loops with small trip ...

[Pengcheng Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f5f4da6db6904a88d23d4bacd01330a205683343
      https://github.com/llvm/llvm-project/commit/f5f4da6db6904a88d23d4bacd01330a205683343
  Author: Pengcheng Wang <wangpengcheng.pp at bytedance.com>
  Date:   2025-03-28 (Fri, 28 Mar 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
    M llvm/test/Transforms/LoopVectorize/RISCV/low-trip-count.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/pr88802.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/short-trip-count.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/truncate-to-minimal-bitwidth-cost.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/truncate-to-minimal-bitwidth-evl-crash.ll

  Log Message:
  -----------
  [RISCV] Don't vectorize for loops with small trip count (#132176)

Inspired by https://reviews.llvm.org/D130755.

I don't know the logic behind the value 5, it is copied from AArch64.

For some tests, I have to change the trip count so that we don't
break what they are testing.



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