[PATCH] D42896: [SelectionDAG] Add initial implementation of TargetLowering::SimplifyDemandedVectorElts

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: efriedma, craig.topper, zvi, sdardis, spatel, andreadb.

This is mainly a move of simplifyShuffleOperands from DAGCombiner::visitVECTOR_SHUFFLE to create a more general purpose TargetLowering::SimplifyDemandedVectorElts implementation.

There are several features that I've begun to implement but haven't made use of yet - the KnownUndef/KnownZero element masks and support for SimplifyDemandedVectorEltsForTargetNode, if people want I can remove these for now.


Repository:
  rL LLVM

https://reviews.llvm.org/D42896

Files:
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/Mips/cconv/vector.ll
  test/CodeGen/X86/combine-sra.ll
  test/CodeGen/X86/split-extend-vector-inreg.ll
  test/CodeGen/X86/sse-intrinsics-fast-isel.ll
  test/CodeGen/X86/sse3.ll
  test/CodeGen/X86/vector-shuffle-avx512.ll
  test/CodeGen/X86/vector-shuffle-combining-avx2.ll
  test/CodeGen/X86/vector-shuffle-sse1.ll
  test/CodeGen/X86/vector-shuffle-v1.ll
  test/CodeGen/X86/vector-trunc.ll

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