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Use 16 bit arithmetic while retrieving the address of callee's frame during indirect function calls, and set pclath before every call to retrieve the frame address.

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llvm-svn: 71323
This commit is contained in:
Sanjiv Gupta 2009-05-09 05:11:19 +00:00
parent bf67b0edef
commit 65a3fde6a5
1 changed files with 16 additions and 7 deletions
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23
lib/Target/PIC16/PIC16ISelLowering.cpp
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@ -1151,10 +1151,14 @@ GetDataAddress(DebugLoc dl, SDValue Callee, SDValue &Chain,
SDValue Data_Lo, Data_Hi;
SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
Hi = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Hi);
// Subtract 2 from Lo to get the Lower part of DataAddress.
Data_Lo = DAG.getNode(ISD::SUB, dl, MVT::i8, Lo, DAG.getConstant(2, MVT::i8));
Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, Hi);
// Subtract 2 from Address to get the Lower part of DataAddress.
SDVTList VTList = DAG.getVTList(MVT::i8, MVT::Flag);
Data_Lo = DAG.getNode(ISD::SUBC, dl, VTList, Lo,
DAG.getConstant(2, MVT::i8));
SDValue Ops[3] = { Hi, DAG.getConstant(0, MVT::i8), Data_Lo.getValue(1)};
Data_Hi = DAG.getNode(ISD::SUBE, dl, VTList, Ops, 3);
SDValue PCLATH = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Data_Hi);
Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, PCLATH);
SDValue Call = DAG.getNode(PIC16ISD::CALLW, dl, Tys, Chain, Callee,
OperFlag);
Chain = getChain(Call);
@ -1172,10 +1176,15 @@ GetDataAddress(DebugLoc dl, SDValue Callee, SDValue &Chain,
Chain = getChain(SeqStart);
OperFlag = getOutFlag(SeqStart); // To manage the data dependency
// Subtract 1 to Lo part for the second code word.
Data_Lo = DAG.getNode(ISD::SUB, dl, MVT::i8, Lo, DAG.getConstant(1, MVT::i8));
// Subtract 1 from Address to get high part of data address.
Data_Lo = DAG.getNode(ISD::SUBC, dl, VTList, Lo,
DAG.getConstant(1, MVT::i8));
SDValue HiOps[3] = { Hi, DAG.getConstant(0, MVT::i8), Data_Lo.getValue(1)};
Data_Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps, 3);
PCLATH = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Data_Hi);
// Use new Lo to make another CALLW
Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, Hi);
Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, PCLATH);
Call = DAG.getNode(PIC16ISD::CALLW, dl, Tys, Chain, Callee, OperFlag);
Chain = getChain(Call);
OperFlag = getOutFlag(Call);