[PATCH] D22975: Add new nodes for computing the Newton series

[Evandro Menezes via llvm-commits]

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ARM and AArch64 are the only targets that I know of which sport instructions specialized to provide not only the initial estimate of the reciprocal and of the reciprocal square root, but also to partially perform the steps in the respective series.

This patch adds support for such targets by using special nodes for each series step instead of expanding the discrete polynomial.

Repository:
  rL LLVM

https://reviews.llvm.org/D22975

Files:
  llvm/include/llvm/CodeGen/ISDOpcodes.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/test/CodeGen/AArch64/recp-fastmath.ll
  llvm/test/CodeGen/AArch64/sqrt-fastmath.ll

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