[PATCH] D135382: [SLP]Fix PR58177: Improve isUndefVector function to avoid extra freeze.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
ABataev added reviewers: RKSimon, vdmitrie, dyung.
Herald added subscribers: vporpo, hiraditya.
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ABataev requested review of this revision.
Herald added a subscriber: pcwang-thead.
Herald added a project: LLVM.

Freeze instruction in some cases makes codegen worse, so need to be very
careful when emitting it. Instead improve analysis in isUndefVector
function to generate mask of unused elements and use it in the analysis.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135382

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/AArch64/tsc-s116.ll
  llvm/test/Transforms/SLPVectorizer/X86/PR35865.ll
  llvm/test/Transforms/SLPVectorizer/X86/buildvector-shuffle.ll
  llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll
  llvm/test/Transforms/SLPVectorizer/X86/resched.ll
  llvm/test/Transforms/SLPVectorizer/X86/scatter-vectorize-reused-pointer.ll
  llvm/test/Transforms/SLPVectorizer/X86/split-load8_2-unord.ll
  llvm/test/Transforms/SLPVectorizer/X86/vec_list_bias_external_insert_shuffled.ll

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