[PATCH] D41293: [DAG] Improve multi-chain merging in ISel

[Nirav Dave via Phabricator via llvm-commits]

niravd created this revision.
niravd added reviewers: craig.topper, bogner.
Herald added a subscriber: hiraditya.

Simplify cycle and generalize validity checks in ISel (HandleMergeInputChains,
findNonImmUse) enabling some instruction matches. Also, we now catch loops going
through indirect chain dependencies earlier in ISel matching.

These two checks should be now use the DAG predecessor framework and should be
mergable into a single cheaper check.

As part of this propogate the NodeId-based cutoffs to narrow
hasPreprocessorHelper searches.


https://reviews.llvm.org/D41293

Files:
  llvm/include/llvm/CodeGen/SelectionDAGNodes.h
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  llvm/test/CodeGen/X86/2012-01-16-mfence-nosse-flags.ll
  llvm/test/CodeGen/X86/avx-vbroadcast.ll
  llvm/test/CodeGen/X86/avx-vbroadcastf128.ll
  llvm/test/CodeGen/X86/avx2-vbroadcast.ll
  llvm/test/CodeGen/X86/avx2-vbroadcasti128.ll
  llvm/test/CodeGen/X86/avx512-vbroadcasti128.ll
  llvm/test/CodeGen/X86/i256-add.ll
  llvm/test/CodeGen/X86/masked_memop.ll
  llvm/test/CodeGen/X86/merge-consecutive-stores.ll
  llvm/test/CodeGen/X86/nontemporal.ll
  llvm/test/CodeGen/X86/store_op_load_fold2.ll
  llvm/test/CodeGen/X86/subvector-broadcast.ll
  llvm/test/CodeGen/X86/var-permute-256.ll
  llvm/test/CodeGen/X86/vector-shuffle-variable-256.ll

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