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allow a target to request that unknown FP_TO_*INT conversion be promoted to

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a larger integer destination.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22547 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-07-29 00:11:56 +00:00
parent fa9c801a6b
commit 1618bebcf6
1 changed files with 74 additions and 1 deletions
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75
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -128,6 +128,8 @@ private:
SDOperand ExpandLegalUINT_TO_FP(SDOperand LegalOp, MVT::ValueType DestVT);
SDOperand PromoteLegalINT_TO_FP(SDOperand LegalOp, MVT::ValueType DestVT,
bool isSigned);
SDOperand PromoteLegalFP_TO_INT(SDOperand LegalOp, MVT::ValueType DestVT,
bool isSigned);
bool ExpandShift(unsigned Opc, SDOperand Op, SDOperand Amt,
SDOperand &Lo, SDOperand &Hi);
@ -202,7 +204,7 @@ SDOperand SelectionDAGLegalize::ExpandLegalUINT_TO_FP(SDOperand Op0,
}
/// PromoteLegalUINT_TO_FP - This function is responsible for legalizing a
/// UINT_TO_FP operation of the specified operand when the target requests that
/// *INT_TO_FP operation of the specified operand when the target requests that
/// we promote it. At this point, we know that the result and operand types are
/// legal for the target, and that there is a legal UINT_TO_FP or SINT_TO_FP
/// operation that takes a larger input.
@ -259,6 +261,63 @@ SDOperand SelectionDAGLegalize::PromoteLegalINT_TO_FP(SDOperand LegalOp,
NewInTy, LegalOp));
}
/// PromoteLegalFP_TO_INT - This function is responsible for legalizing a
/// FP_TO_*INT operation of the specified operand when the target requests that
/// we promote it. At this point, we know that the result and operand types are
/// legal for the target, and that there is a legal FP_TO_UINT or FP_TO_SINT
/// operation that returns a larger result.
SDOperand SelectionDAGLegalize::PromoteLegalFP_TO_INT(SDOperand LegalOp,
MVT::ValueType DestVT,
bool isSigned) {
// First step, figure out the appropriate FP_TO*INT operation to use.
MVT::ValueType NewOutTy = DestVT;
unsigned OpToUse = 0;
// Scan for the appropriate larger type to use.
while (1) {
NewOutTy = (MVT::ValueType)(NewOutTy+1);
assert(MVT::isInteger(NewOutTy) && "Ran out of possibilities!");
// If the target supports FP_TO_SINT returning this type, use it.
switch (TLI.getOperationAction(ISD::FP_TO_SINT, NewOutTy)) {
default: break;
case TargetLowering::Legal:
if (!TLI.hasNativeSupportFor(NewOutTy))
break; // Can't use this datatype.
// FALL THROUGH.
case TargetLowering::Custom:
OpToUse = ISD::FP_TO_SINT;
break;
}
if (OpToUse) break;
// If the target supports FP_TO_UINT of this type, use it.
switch (TLI.getOperationAction(ISD::FP_TO_UINT, NewOutTy)) {
default: break;
case TargetLowering::Legal:
if (!TLI.hasNativeSupportFor(NewOutTy))
break; // Can't use this datatype.
// FALL THROUGH.
case TargetLowering::Custom:
OpToUse = ISD::FP_TO_UINT;
break;
}
if (OpToUse) break;
// Otherwise, try a larger type.
}
// Make sure to legalize any nodes we create here in the next pass.
NeedsAnotherIteration = true;
// Okay, we found the operation and type to use. Truncate the result of the
// extended FP_TO_*INT operation to the desired size.
return DAG.getNode(ISD::TRUNCATE, DestVT,
DAG.getNode(OpToUse, NewOutTy, LegalOp));
}
void SelectionDAGLegalize::LegalizeDAG() {
SDOperand OldRoot = DAG.getRoot();
SDOperand NewRoot = LegalizeOp(OldRoot);
@ -1511,6 +1570,20 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
case ISD::FP_TO_UINT:
switch (getTypeAction(Node->getOperand(0).getValueType())) {
case Legal:
switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))){
default: assert(0 && "Unknown operation action!");
case TargetLowering::Expand:
assert(0 && "Cannot expand FP_TO*INT yet");
case TargetLowering::Promote:
Result = PromoteLegalFP_TO_INT(LegalizeOp(Node->getOperand(0)),
Node->getValueType(0),
Node->getOpcode() == ISD::FP_TO_SINT);
AddLegalizedOperand(Op, Result);
return Result;
case TargetLowering::Legal:
break;
}
Tmp1 = LegalizeOp(Node->getOperand(0));
if (Tmp1 != Node->getOperand(0))
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1);