[all-commits] [llvm/llvm-project] 9c588f: [DAGCombine] Add hook to allow target specific tes...

[QingShan Zhang via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 9c588f53fc423dd0ed69250fbc93b37b40c0ef44
      https://github.com/llvm/llvm-project/commit/9c588f53fc423dd0ed69250fbc93b37b40c0ef44
  Author: QingShan Zhang <qshanz at cn.ibm.com>
  Date:   2020-11-25 (Wed, 25 Nov 2020)

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

  Log Message:
  -----------
  [DAGCombine] Add hook to allow target specific test for sqrt input

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.

Reviewed By: Spatel, Chen Zheng, Qiu Chao Fang

Differential Revision: https://reviews.llvm.org/D80706