[all-commits] [llvm/llvm-project] cdf5cf: Revert "[SDAG] remove use restriction in isNegatib...

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  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: cdf5cfea8e5204e5d2facd6663c4b49b9e0378e9
      https://github.com/llvm/llvm-project/commit/cdf5cfea8e5204e5d2facd6663c4b49b9e0378e9
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2019-12-11 (Wed, 11 Dec 2019)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/lib/Target/X86/X86ISelLowering.h
    M llvm/test/CodeGen/AArch64/arm64-fmadd.ll
    M llvm/test/CodeGen/X86/fma-fneg-combine-2.ll

  Log Message:
  -----------
  Revert "[SDAG] remove use restriction in isNegatibleForFree() when called from getNegatedExpression()"

This reverts commit d1f0bdf2d2df9bdf11ee2ddfff3df50e53f2f042.
The patch can cause infinite loops in DAGCombiner.