[all-commits] [llvm/llvm-project] 1be342: [SLP]Fix PR58177: Improve isUndefVector function t...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1be3428ea05c5242fda64797538aa72c8d8f6376
      https://github.com/llvm/llvm-project/commit/1be3428ea05c5242fda64797538aa72c8d8f6376
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2022-10-12 (Wed, 12 Oct 2022)

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

  Log Message:
  -----------
  [SLP]Fix PR58177: Improve isUndefVector function to avoid extra freeze.

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.

Differential Revision: https://reviews.llvm.org/D135382