[all-commits] [llvm/llvm-project] bdaf3c: [SLP] Improve InsertElement scalarization cost mod...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bdaf3cfda6d670109058d75aa1de82beffb4c954
      https://github.com/llvm/llvm-project/commit/bdaf3cfda6d670109058d75aa1de82beffb4c954
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-05-27 (Wed, 27 May 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-calls-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-calls.ll
    M llvm/test/Transforms/SLPVectorizer/X86/arith-fp-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/arith-fp.ll
    M llvm/test/Transforms/SLPVectorizer/X86/deleted-instructions-clear.ll
    M llvm/test/Transforms/SLPVectorizer/X86/revec-non-power-2-to-power-2-large-vect.ll
    M llvm/test/Transforms/SLPVectorizer/X86/scalarize-ctlz.ll
    M llvm/test/Transforms/SLPVectorizer/X86/select-copyable-cmp-poison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/sitofp.ll
    M llvm/test/Transforms/SLPVectorizer/X86/vec_list_bias-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/vec_list_bias.ll
    M llvm/test/Transforms/SLPVectorizer/X86/vec_list_bias_external_insert_shuffled.ll
    M llvm/test/Transforms/SLPVectorizer/X86/vectorize-widest-phis.ll
    M llvm/test/Transforms/SLPVectorizer/extract-many-users-buildvector.ll

  Log Message:
  -----------
  [SLP] Improve InsertElement scalarization cost modeling

When costing InsertElement tree entries, pass getScalarizationOverhead the
per-lane insert operands via AdjustedVL, set ForPoisonSrc from whether the
base vector is entirely undef, and supply a VectorInstrContext hint derived
from the demanded insert instructions. Move the scalarization cost adjustment
to after InMask is computed so ForPoisonSrc reflects the actual base vector
state.

Reviewers: bababuck, RKSimon, hiraditya

Pull Request: https://github.com/llvm/llvm-project/pull/199514



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