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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.

llvm-svn: 46061
This commit is contained in:
Chris Lattner 2008-01-16 06:57:07 +00:00
parent 6e3379c07b
commit 91d86242f9
1 changed files with 55 additions and 32 deletions
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87
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -3569,18 +3569,50 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
}
break;
case ISD::FP_EXTEND:
case ISD::FP_EXTEND: {
MVT::ValueType newVT = Op.getValueType();
MVT::ValueType oldVT = Op.getOperand(0).getValueType();
if (TLI.getConvertAction(oldVT, newVT) == TargetLowering::Expand) {
// The only other way we can lower this is to turn it into a STORE,
// LOAD pair, targetting a temporary location (a stack slot).
// NOTE: there is a choice here between constantly creating new stack
// slots and always reusing the same one. We currently always create
// new ones, as reuse may inhibit scheduling.
const Type *Ty = MVT::getTypeForValueType(oldVT);
uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
unsigned Align = TLI.getTargetData()->getPrefTypeAlignment(Ty);
MachineFunction &MF = DAG.getMachineFunction();
int SSFI =
MF.getFrameInfo()->CreateStackObject(TySize, Align);
SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
Result = DAG.getStore(DAG.getEntryNode(), Node->getOperand(0),
StackSlot, NULL, 0);
Result = DAG.getExtLoad(ISD::EXTLOAD, newVT,
Result, StackSlot, NULL, 0, oldVT);
break;
}
}
switch (getTypeAction(Node->getOperand(0).getValueType())) {
case Expand: assert(0 && "Shouldn't need to expand other operators here!");
case Legal:
Tmp1 = LegalizeOp(Node->getOperand(0));
Result = DAG.UpdateNodeOperands(Result, Tmp1);
break;
case Promote:
Tmp1 = PromoteOp(Node->getOperand(0));
Result = DAG.getNode(ISD::FP_EXTEND, Op.getValueType(), Tmp1);
break;
}
break;
case ISD::FP_ROUND: {
MVT::ValueType newVT = Op.getValueType();
MVT::ValueType oldVT = Op.getOperand(0).getValueType();
if (TLI.getConvertAction(oldVT, newVT) == TargetLowering::Expand) {
if (Node->getOpcode() == ISD::FP_ROUND && oldVT == MVT::ppcf128) {
if (oldVT == MVT::ppcf128) {
SDOperand Lo, Hi;
ExpandOp(Node->getOperand(0), Lo, Hi);
if (newVT == MVT::f64)
Result = Hi;
else
Result = DAG.getNode(ISD::FP_ROUND, newVT, Hi);
Result = DAG.getNode(ISD::FP_ROUND, newVT, Hi);
break;
} else {
// The only other way we can lower this is to turn it into a STORE,
@ -3589,30 +3621,31 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
// NOTE: there is a choice here between constantly creating new stack
// slots and always reusing the same one. We currently always create
// new ones, as reuse may inhibit scheduling.
MVT::ValueType slotVT =
(Node->getOpcode() == ISD::FP_EXTEND) ? oldVT : newVT;
const Type *Ty = MVT::getTypeForValueType(slotVT);
const Type *Ty = MVT::getTypeForValueType(newVT);
uint64_t TySize = TLI.getTargetData()->getABITypeSize(Ty);
unsigned Align = TLI.getTargetData()->getPrefTypeAlignment(Ty);
MachineFunction &MF = DAG.getMachineFunction();
int SSFI =
MF.getFrameInfo()->CreateStackObject(TySize, Align);
int SSFI = MF.getFrameInfo()->CreateStackObject(TySize, Align);
SDOperand StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy());
if (Node->getOpcode() == ISD::FP_EXTEND) {
Result = DAG.getStore(DAG.getEntryNode(), Node->getOperand(0),
StackSlot, NULL, 0);
Result = DAG.getExtLoad(ISD::EXTLOAD, newVT,
Result, StackSlot, NULL, 0, oldVT);
} else {
Result = DAG.getTruncStore(DAG.getEntryNode(), Node->getOperand(0),
StackSlot, NULL, 0, newVT);
Result = DAG.getLoad(newVT, Result, StackSlot, NULL, 0);
}
Result = DAG.getTruncStore(DAG.getEntryNode(), Node->getOperand(0),
StackSlot, NULL, 0, newVT);
Result = DAG.getLoad(newVT, Result, StackSlot, NULL, 0);
break;
}
}
}
// FALL THROUGH
switch (getTypeAction(Node->getOperand(0).getValueType())) {
case Expand: assert(0 && "Shouldn't need to expand other operators here!");
case Legal:
Tmp1 = LegalizeOp(Node->getOperand(0));
Result = DAG.UpdateNodeOperands(Result, Tmp1);
break;
case Promote:
Tmp1 = PromoteOp(Node->getOperand(0));
Result = DAG.getNode(ISD::FP_ROUND, Op.getValueType(), Tmp1);
break;
}
break;
case ISD::ANY_EXTEND:
case ISD::ZERO_EXTEND:
case ISD::SIGN_EXTEND:
@ -3641,16 +3674,6 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
Result,
DAG.getValueType(Node->getOperand(0).getValueType()));
break;
case ISD::FP_EXTEND:
Result = PromoteOp(Node->getOperand(0));
if (Result.getValueType() != Op.getValueType())
// Dynamically dead while we have only 2 FP types.
Result = DAG.getNode(ISD::FP_EXTEND, Op.getValueType(), Result);
break;
case ISD::FP_ROUND:
Result = PromoteOp(Node->getOperand(0));
Result = DAG.getNode(Node->getOpcode(), Op.getValueType(), Result);
break;
}
}
break;