[PATCH] D80706: [DAGCombine] Add hook to allow target specific test for sqrt input

[Qing Shan Zhang via Phabricator via llvm-commits]

steven.zhang created this revision.
steven.zhang added reviewers: spatel, RKSimon, jsji, PowerPC.
Herald added subscribers: ecnelises, wuzish, kbarton, hiraditya, nemanjai.
Herald added a project: LLVM.

PowerPC has instruction ftsqrt/xstsqrtdp etc to do the input test for software square root. LLVM now tests it with smallest normalized value using abs + setcc. We should add hook to target that has test instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80706

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h
  llvm/lib/Target/PowerPC/PPCInstrFormats.td
  llvm/lib/Target/PowerPC/PPCInstrInfo.td
  llvm/lib/Target/PowerPC/PPCInstrVSX.td
  llvm/test/CodeGen/PowerPC/fma-mutate.ll
  llvm/test/CodeGen/PowerPC/recipest.ll

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