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Change legalizeop of FP_ROUND and FP_EXTEND to not fall through
into the ANY_EXTEND/ZERO_EXTEND/SIGN_EXTEND code to simplify it. Unmerge the code for FP_ROUND and FP_EXTEND from each other to make each one simpler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46061 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3569,18 +3569,50 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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}
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break;
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case ISD::FP_EXTEND:
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case ISD::FP_EXTEND: {
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MVT::ValueType newVT = Op.getValueType();
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MVT::ValueType oldVT = Op.getOperand(0).getValueType();
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if (TLI.getConvertAction(oldVT, newVT) == TargetLowering::Expand) {
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// The only other way we can lower this is to turn it into a STORE,
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// LOAD pair, targetting a temporary location (a stack slot).
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// NOTE: there is a choice here between constantly creating new stack
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// slots and always reusing the same one. We currently always create
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// new ones, as reuse may inhibit scheduling.
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const Type *Ty = MVT::getTypeForValueType(oldVT);
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uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
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unsigned Align = TLI.getTargetData()->getPrefTypeAlignment(Ty);
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MachineFunction &MF = DAG.getMachineFunction();
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int SSFI =
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MF.getFrameInfo()->CreateStackObject(TySize, Align);
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SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
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Result = DAG.getStore(DAG.getEntryNode(), Node->getOperand(0),
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StackSlot, NULL, 0);
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Result = DAG.getExtLoad(ISD::EXTLOAD, newVT,
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Result, StackSlot, NULL, 0, oldVT);
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break;
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}
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}
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switch (getTypeAction(Node->getOperand(0).getValueType())) {
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case Expand: assert(0 && "Shouldn't need to expand other operators here!");
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case Legal:
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Tmp1 = LegalizeOp(Node->getOperand(0));
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Result = DAG.UpdateNodeOperands(Result, Tmp1);
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break;
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case Promote:
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Tmp1 = PromoteOp(Node->getOperand(0));
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Result = DAG.getNode(ISD::FP_EXTEND, Op.getValueType(), Tmp1);
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break;
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}
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break;
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case ISD::FP_ROUND: {
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MVT::ValueType newVT = Op.getValueType();
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MVT::ValueType oldVT = Op.getOperand(0).getValueType();
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if (TLI.getConvertAction(oldVT, newVT) == TargetLowering::Expand) {
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if (Node->getOpcode() == ISD::FP_ROUND && oldVT == MVT::ppcf128) {
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if (oldVT == MVT::ppcf128) {
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SDOperand Lo, Hi;
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ExpandOp(Node->getOperand(0), Lo, Hi);
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if (newVT == MVT::f64)
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Result = Hi;
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else
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Result = DAG.getNode(ISD::FP_ROUND, newVT, Hi);
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Result = DAG.getNode(ISD::FP_ROUND, newVT, Hi);
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break;
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} else {
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// The only other way we can lower this is to turn it into a STORE,
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@ -3589,30 +3621,31 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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// NOTE: there is a choice here between constantly creating new stack
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// slots and always reusing the same one. We currently always create
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// new ones, as reuse may inhibit scheduling.
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MVT::ValueType slotVT =
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(Node->getOpcode() == ISD::FP_EXTEND) ? oldVT : newVT;
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const Type *Ty = MVT::getTypeForValueType(slotVT);
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const Type *Ty = MVT::getTypeForValueType(newVT);
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uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
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unsigned Align = TLI.getTargetData()->getPrefTypeAlignment(Ty);
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MachineFunction &MF = DAG.getMachineFunction();
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int SSFI =
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MF.getFrameInfo()->CreateStackObject(TySize, Align);
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int SSFI = MF.getFrameInfo()->CreateStackObject(TySize, Align);
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SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
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if (Node->getOpcode() == ISD::FP_EXTEND) {
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Result = DAG.getStore(DAG.getEntryNode(), Node->getOperand(0),
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StackSlot, NULL, 0);
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Result = DAG.getExtLoad(ISD::EXTLOAD, newVT,
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Result, StackSlot, NULL, 0, oldVT);
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} else {
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Result = DAG.getTruncStore(DAG.getEntryNode(), Node->getOperand(0),
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StackSlot, NULL, 0, newVT);
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Result = DAG.getLoad(newVT, Result, StackSlot, NULL, 0);
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}
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Result = DAG.getTruncStore(DAG.getEntryNode(), Node->getOperand(0),
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StackSlot, NULL, 0, newVT);
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Result = DAG.getLoad(newVT, Result, StackSlot, NULL, 0);
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break;
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}
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}
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}
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// FALL THROUGH
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switch (getTypeAction(Node->getOperand(0).getValueType())) {
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case Expand: assert(0 && "Shouldn't need to expand other operators here!");
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case Legal:
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Tmp1 = LegalizeOp(Node->getOperand(0));
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Result = DAG.UpdateNodeOperands(Result, Tmp1);
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break;
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case Promote:
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Tmp1 = PromoteOp(Node->getOperand(0));
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Result = DAG.getNode(ISD::FP_ROUND, Op.getValueType(), Tmp1);
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break;
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}
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break;
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case ISD::ANY_EXTEND:
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case ISD::ZERO_EXTEND:
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case ISD::SIGN_EXTEND:
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@ -3641,16 +3674,6 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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Result,
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DAG.getValueType(Node->getOperand(0).getValueType()));
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break;
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case ISD::FP_EXTEND:
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Result = PromoteOp(Node->getOperand(0));
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if (Result.getValueType() != Op.getValueType())
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// Dynamically dead while we have only 2 FP types.
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Result = DAG.getNode(ISD::FP_EXTEND, Op.getValueType(), Result);
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break;
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case ISD::FP_ROUND:
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Result = PromoteOp(Node->getOperand(0));
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Result = DAG.getNode(Node->getOpcode(), Op.getValueType(), Result);
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break;
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}
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}
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break;
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