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[AArch64] Implement FrameAddr and ReturnAddr

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Fixes PR17690


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Weiming Zhao 2013-10-29 17:00:25 +00:00
parent 57bca7b26e
commit 160a14e2b1
2 changed files with 43 additions and 0 deletions
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41
lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -1958,6 +1958,45 @@ AArch64TargetLowering::LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG,
return LowerF128ToCall(Op, DAG, LC);
}
SDValue AArch64TargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const{
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MFI->setReturnAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc dl(Op);
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
if (Depth) {
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
SDValue Offset = DAG.getConstant(8, MVT::i64);
return DAG.getLoad(VT, dl, DAG.getEntryNode(),
DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
MachinePointerInfo(), false, false, false, 0);
}
// Return X30, which contains the return address. Mark it an implicit live-in.
unsigned Reg = MF.addLiveIn(AArch64::X30, getRegClassFor(MVT::i64));
return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, MVT::i64);
}
SDValue AArch64TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG)
const {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
MFI->setFrameAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc dl(Op);
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
unsigned FrameReg = AArch64::X29;
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
while (Depth--)
FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
MachinePointerInfo(),
false, false, false, 0);
return FrameAddr;
}
SDValue
AArch64TargetLowering::LowerGlobalAddressELFLarge(SDValue Op,
SelectionDAG &DAG) const {
@ -2703,6 +2742,8 @@ AArch64TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG, false);
case ISD::FP_ROUND: return LowerFP_ROUND(Op, DAG);
case ISD::FP_EXTEND: return LowerFP_EXTEND(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::BRCOND: return LowerBRCOND(Op, DAG);

2
lib/Target/AArch64/AArch64ISelLowering.h
View File

@ -246,6 +246,8 @@ public:
SDValue LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG, bool IsSigned) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressELFSmall(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressELFLarge(SDValue Op, SelectionDAG &DAG) const;