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Differential D80489 Diff 265919 llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

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llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

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Show First 20 Lines • Show All 6,002 Lines • ▼ Show 20 Linesbool TargetLowering::expandFunnelShift(SDNode *Node, SDValue &Result,
SDValue Z = Node->getOperand(2); SDValue Z = Node->getOperand(2);
unsigned EltSizeInBits = VT.getScalarSizeInBits(); unsigned EltSizeInBits = VT.getScalarSizeInBits();
bool IsFSHL = Node->getOpcode() == ISD::FSHL; bool IsFSHL = Node->getOpcode() == ISD::FSHL;
SDLoc DL(SDValue(Node, 0)); SDLoc DL(SDValue(Node, 0));
EVT ShVT = Z.getValueType(); EVT ShVT = Z.getValueType();
SDValue Mask = DAG.getConstant(EltSizeInBits - 1, DL, ShVT); SDValue Mask = DAG.getConstant(EltSizeInBits - 1, DL, ShVT);
SDValue ShAmt; SDValue ShAmt, InvShAmt;
if (isPowerOf2_32(EltSizeInBits)) { if (isPowerOf2_32(EltSizeInBits)) {
// Z % BW -> Z & (BW - 1) // Z % BW -> Z & (BW - 1)
ShAmt = DAG.getNode(ISD::AND, DL, ShVT, Z, Mask); ShAmt = DAG.getNode(ISD::AND, DL, ShVT, Z, Mask);
// (BW - 1) - (Z % BW) -> ~Z & (BW - 1)
InvShAmt = DAG.getNode(ISD::AND, DL, ShVT, DAG.getNOT(DL, Z, ShVT), Mask);
} else { } else {
SDValue BitWidthC = DAG.getConstant(EltSizeInBits, DL, ShVT); SDValue BitWidthC = DAG.getConstant(EltSizeInBits, DL, ShVT);
ShAmt = DAG.getNode(ISD::UREM, DL, ShVT, Z, BitWidthC); ShAmt = DAG.getNode(ISD::UREM, DL, ShVT, Z, BitWidthC);
InvShAmt = DAG.getNode(ISD::SUB, DL, ShVT, Mask, ShAmt);
} }
SDValue InvShAmt = DAG.getNode(ISD::SUB, DL, ShVT, Mask, ShAmt);
SDValue One = DAG.getConstant(1, DL, ShVT); SDValue One = DAG.getConstant(1, DL, ShVT);
SDValue ShX, ShY; SDValue ShX, ShY;
if (IsFSHL) { if (IsFSHL) {
ShX = DAG.getNode(ISD::SHL, DL, VT, X, ShAmt); ShX = DAG.getNode(ISD::SHL, DL, VT, X, ShAmt);
SDValue ShY1 = DAG.getNode(ISD::SRL, DL, VT, Y, One); SDValue ShY1 = DAG.getNode(ISD::SRL, DL, VT, Y, One);
ShY = DAG.getNode(ISD::SRL, DL, VT, ShY1, InvShAmt); ShY = DAG.getNode(ISD::SRL, DL, VT, ShY1, InvShAmt);
} else { } else {
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