[all-commits] [llvm/llvm-project] 74760b: [LV][ARM] Add preferInloopReduction target hook.

[David Green via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 74760bb00fb9b78a2fe12242716bd6976b8c3566
      https://github.com/llvm/llvm-project/commit/74760bb00fb9b78a2fe12242716bd6976b8c3566
  Author: David Green <david.green at arm.com>
  Date:   2020-09-12 (Sat, 12 Sep 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfo.h
    M llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    M llvm/lib/Analysis/TargetTransformInfo.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.h
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-types.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reductions.ll

  Log Message:
  -----------
  [LV][ARM] Add preferInloopReduction target hook.

This allows the backend to tell the vectorizer to produce inloop
reductions through a TTI hook.

For the moment on ARM under MVE this means allowing integer add
reductions of the correct size. In the future this can include integer
min/max too, under -Os.

Differential Revision: https://reviews.llvm.org/D75512