diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/TargetLowering.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index d439a6f869..14f0ef518f 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -2342,6 +2342,33 @@ TargetLowering::SimplifySetCC(EVT VT, SDValue N0, SDValue N1, return DAG.getSetCC(dl, VT, Shift, CmpRHS, Cond); } } + } else if (Cond == ISD::SETULT || Cond == ISD::SETUGE || + Cond == ISD::SETULE || Cond == ISD::SETUGT) { + bool AdjOne = (Cond == ISD::SETULE || Cond == ISD::SETUGT); + // X < 0x100000000 -> (X >> 32) < 1 + // X >= 0x100000000 -> (X >> 32) >= 1 + // X <= 0x0ffffffff -> (X >> 32) < 1 + // X > 0x0ffffffff -> (X >> 32) >= 1 + unsigned ShiftBits; + APInt NewC = C1; + ISD::CondCode NewCond = Cond; + if (AdjOne) { + ShiftBits = C1.countTrailingOnes(); + NewC = NewC + 1; + NewCond = (Cond == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE; + } else { + ShiftBits = C1.countTrailingZeros(); + } + NewC = NewC.lshr(ShiftBits); + if (ShiftBits && isLegalICmpImmediate(NewC.getSExtValue())) { + EVT ShiftTy = DCI.isBeforeLegalize() ? + getPointerTy() : getShiftAmountTy(N0.getValueType()); + EVT CmpTy = N0.getValueType(); + SDValue Shift = DAG.getNode(ISD::SRL, dl, CmpTy, N0, + DAG.getConstant(ShiftBits, ShiftTy)); + SDValue CmpRHS = DAG.getConstant(NewC, CmpTy); + return DAG.getSetCC(dl, VT, Shift, CmpRHS, NewCond); + } } } } |