[PATCH] D115646: [DAG][TLI][X86][ARM][AArch64] Add `isExtractSubvectorFree` / use it in `foldExtractSubvectorFromShuffleVector()`

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: RKSimon, t.p.northover, greened.
lebedev.ri added a project: LLVM.
Herald added subscribers: ecnelises, pengfei, hiraditya, kristof.beyls.
lebedev.ri requested review of this revision.

This generalizes the hardcoded profitability check that was just added in D104156 <https://reviews.llvm.org/D104156>.
To my surprize, this does not catch any new cases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D115646

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/ARM/ARMISelLowering.h
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h

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