[all-commits] [llvm/llvm-project] 056367: [LV]Support dropping of nneg flag for zext widenca...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 056367bb1933d8484463489dc9af0b1dce0c14a9
      https://github.com/llvm/llvm-project/commit/056367bb1933d8484463489dc9af0b1dce0c14a9
  Author: Alexey Bataev <5361294+alexey-bataev at users.noreply.github.com>
  Date:   2023-12-05 (Tue, 05 Dec 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/X86/drop-poison-generating-flags.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing.ll

  Log Message:
  -----------
  [LV]Support dropping of nneg flag for zext widencast recipes. (#74112)

Compiler crashes when the assertion triggered for zext nneg instruction,
that checks that the instruction cannot produce poison. Changed the base
class for widencast recipe to handle dropping nneg flag to avoid
compiler crash.