[all-commits] [llvm/llvm-project] fcff45: [LoongArch] Permit auto-vectorization using LSX/LA...

[wanglei via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fcff4582f01db2f5a99e3acf452aec9f2d8a126a
      https://github.com/llvm/llvm-project/commit/fcff4582f01db2f5a99e3acf452aec9f2d8a126a
  Author: wanglei <wanglei at loongson.cn>
  Date:   2024-01-23 (Tue, 23 Jan 2024)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArch.td
    M llvm/lib/Target/LoongArch/LoongArchSubtarget.h
    M llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp
    M llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h
    A llvm/test/Transforms/LoopVectorize/LoongArch/defaults.ll
    A llvm/test/Transforms/LoopVectorize/LoongArch/lit.local.cfg

  Log Message:
  -----------
  [LoongArch] Permit auto-vectorization using LSX/LASX with `auto-vec` feature (#78943)

With enough codegen complete, we can now correctly report the size of
vector registers for LSX/LASX, allowing auto vectorization (The
`auto-vec` feature needs to be enabled simultaneously).

As described, the `auto-vec` feature is an experimental one. To ensure
that automatic vectorization is not enabled by default, because the
information provided by the current `TTI` cannot yield additional
benefits for automatic vectorization.