[all-commits] [llvm/llvm-project] c90235: [LV] Drop wrap flags for reductions using VP def-u...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c90235f0ef0bcdfab5087da496ea44de652a7363
      https://github.com/llvm/llvm-project/commit/c90235f0ef0bcdfab5087da496ea44de652a7363
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-05-19 (Thu, 19 May 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/reduction-with-invariant-store.ll

  Log Message:
  -----------
  [LV] Drop wrap flags for reductions using VP def-use chain.

Update clearReductionWrapFlags to use the VPlan def-use chain from the
reduction phi recipe to drop reduction wrap flags.

This addresses an existing FIXME and fixes a crash when instructions in
the reduction chain are not used and have been removed before VPlan
codegeneration.

Fixes #55540.