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Fixed AddLiveOut issues
FI's created the write way to represent Mips stack git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
parent
332a3d22a2
commit
2ab22d1b93
@ -139,14 +139,14 @@ AddLiveIn(MachineFunction &MF, unsigned PReg, TargetRegisterClass *RC)
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}
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// Set up a frame object for the return address.
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SDOperand MipsTargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) {
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if (ReturnAddrIndex == 0) {
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MachineFunction &MF = DAG.getMachineFunction();
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ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(4, 0);
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}
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return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy());
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}
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//SDOperand MipsTargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) {
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// if (ReturnAddrIndex == 0) {
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// MachineFunction &MF = DAG.getMachineFunction();
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// ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(4, 0);
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// }
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//
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// return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy());
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//}
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//===----------------------------------------------------------------------===//
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@ -170,17 +170,6 @@ LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG)
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assert(0 && "TLS not implemented for MIPS.");
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}
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SDOperand MipsTargetLowering::
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LowerRETURNADDR(SDOperand Op, SelectionDAG &DAG) {
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// Depths > 0 not supported yet!
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if (cast<ConstantSDNode>(Op.getOperand(0))->getValue() > 0)
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return SDOperand();
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// Just load the return address
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SDOperand RetAddrFI = getReturnAddressFrameIndex(DAG);
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return DAG.getLoad(getPointerTy(), DAG.getEntryNode(), RetAddrFI, NULL, 0);
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}
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//===----------------------------------------------------------------------===//
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// Calling Convention Implementation
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//
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@ -222,17 +211,28 @@ LowerCALL(SDOperand Op, SelectionDAG &DAG)
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SDOperand MipsTargetLowering::
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LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, unsigned CC)
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{
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MachineFunction &MF = DAG.getMachineFunction();
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unsigned StackReg = MF.getTarget().getRegisterInfo()->getFrameRegister(MF);
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SDOperand Chain = Op.getOperand(0);
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SDOperand Callee = Op.getOperand(4);
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bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
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MachineFrameInfo *MFI = MF.getFrameInfo();
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// Analyze operands of the call, assigning locations to each operand.
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SmallVector<CCValAssign, 16> ArgLocs;
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CCState CCInfo(CC, getTargetMachine(), ArgLocs);
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CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
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// To meet ABI, Mips must always allocate 16 bytes on
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// the stack (even if less than 4 are used as arguments)
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int VTsize = MVT::getSizeInBits(MVT::i32)/8;
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MFI->CreateFixedObject(VTsize, -(VTsize*3));
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CCInfo.AnalyzeCallOperands(Op.Val, CC_Mips);
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// Get a count of how many bytes are to be pushed on the stack.
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unsigned NumBytes = CCInfo.getNextStackOffset();
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Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(NumBytes,
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getPointerTy()));
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@ -268,17 +268,19 @@ LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, unsigned CC)
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if (VA.isRegLoc()) {
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RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
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} else {
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assert(VA.isMemLoc());
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// Mips::SP holds our stack pointer
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if (StackPtr.Val == 0)
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StackPtr = DAG.getRegister(Mips::SP, getPointerTy());
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StackPtr = DAG.getRegister(StackReg, getPointerTy());
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SDOperand PtrOff = DAG.getConstant(VA.getLocMemOffset(),
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getPointerTy());
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// emit a ISD::ADD which emits the final
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// stack location to place the parameter
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PtrOff = DAG.getNode(ISD::ADD, getPointerTy(), StackPtr, PtrOff);
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// Create the frame index object for this incoming parameter
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// This guarantees that when allocating Local Area our room
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// will not be overwritten.
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int FI = MFI->CreateFixedObject(MVT::getSizeInBits(VA.getValVT())/8,
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-(16 + VA.getLocMemOffset()) );
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SDOperand PtrOff = DAG.getFrameIndex(FI,getPointerTy());
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// emit ISD::STORE whichs stores the
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// parameter value to a stack Location
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@ -287,7 +289,7 @@ LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, unsigned CC)
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}
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// Transform all store nodes into one single node because
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// all store nodes ar independent of each other.
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// all store nodes are independent of each other.
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if (!MemOpChains.empty())
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Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
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&MemOpChains[0], MemOpChains.size());
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@ -356,13 +358,16 @@ SDNode *MipsTargetLowering::
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LowerCallResult(SDOperand Chain, SDOperand InFlag, SDNode *TheCall,
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unsigned CallingConv, SelectionDAG &DAG) {
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bool isVarArg = cast<ConstantSDNode>(TheCall->getOperand(2))->getValue() != 0;
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// Assign locations to each value returned by this call.
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SmallVector<CCValAssign, 16> RVLocs;
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CCState CCInfo(CallingConv, getTargetMachine(), RVLocs);
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CCState CCInfo(CallingConv, isVarArg, getTargetMachine(), RVLocs);
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CCInfo.AnalyzeCallResult(TheCall, RetCC_Mips);
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SmallVector<SDOperand, 8> ResultVals;
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// returns void
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// Returns void
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if (!RVLocs.size())
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return Chain.Val;
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@ -405,16 +410,22 @@ LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG)
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SDOperand MipsTargetLowering::
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LowerCCCArguments(SDOperand Op, SelectionDAG &DAG)
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{
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SDOperand Root = Op.getOperand(0);
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MachineFunction &MF = DAG.getMachineFunction();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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SDOperand Root = Op.getOperand(0);
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bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
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unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
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unsigned StackReg = MF.getTarget().getRegisterInfo()->getFrameRegister(MF);
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// Assign locations to all of the incoming arguments.
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SmallVector<CCValAssign, 16> ArgLocs;
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CCState CCInfo(MF.getFunction()->getCallingConv(),
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getTargetMachine(), ArgLocs);
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CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
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CCInfo.AnalyzeFormalArguments(Op.Val, CC_Mips);
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SmallVector<SDOperand, 8> ArgValues;
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SDOperand StackPtr;
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for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
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@ -430,10 +441,10 @@ LowerCCCArguments(SDOperand Op, SelectionDAG &DAG)
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else
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assert(0 && "support only Mips::CPURegsRegisterClass");
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unsigned Reg = AddLiveIn(DAG.getMachineFunction(), VA.getLocReg(), RC);
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// Transform the arguments stored on
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// physical registers into virtual ones
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unsigned Reg = AddLiveIn(DAG.getMachineFunction(), VA.getLocReg(), RC);
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SDOperand ArgValue = DAG.getCopyFromReg(Root, Reg, RegVT);
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// If this is an 8 or 16-bit value, it is really passed promoted
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@ -451,13 +462,32 @@ LowerCCCArguments(SDOperand Op, SelectionDAG &DAG)
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ArgValues.push_back(ArgValue);
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// To meet ABI, when VARARGS are passed on registers, the registers
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// containt must be written to the their always reserved home location
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// on the stack.
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if (isVarArg) {
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if (StackPtr.Val == 0)
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StackPtr = DAG.getRegister(StackReg, getPointerTy());
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// Create the frame index object for this incoming parameter
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// The first 16 bytes are reserved.
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int FI = MFI->CreateFixedObject(MVT::getSizeInBits(VA.getValVT())/8,
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i*4);
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SDOperand PtrOff = DAG.getFrameIndex(FI, getPointerTy());
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// emit ISD::STORE whichs stores the
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// parameter value to a stack Location
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ArgValues.push_back(DAG.getStore(Root, ArgValue, PtrOff, NULL, 0));
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}
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} else {
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// sanity check
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assert(VA.isMemLoc());
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// Create the frame index object for this incoming parameter...
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int FI = MFI->CreateFixedObject(MVT::getSizeInBits(VA.getValVT())/8,
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VA.getLocMemOffset());
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(16 + VA.getLocMemOffset()));
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// Create load nodes to retrieve arguments from the stack
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SDOperand FIN = DAG.getFrameIndex(FI, getPointerTy());
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@ -466,8 +496,6 @@ LowerCCCArguments(SDOperand Op, SelectionDAG &DAG)
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}
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ArgValues.push_back(Root);
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ReturnAddrIndex = 0;
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// Return the new list of results.
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return DAG.getNode(ISD::MERGE_VALUES, Op.Val->getVTList(),
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&ArgValues[0], ArgValues.size()).getValue(Op.ResNo);
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@ -483,10 +511,11 @@ LowerRET(SDOperand Op, SelectionDAG &DAG)
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// CCValAssign - represent the assignment of
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// the return value to a location
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SmallVector<CCValAssign, 16> RVLocs;
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unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
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unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
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bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
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// CCState - Info about the registers and stack slot.
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CCState CCInfo(CC, getTargetMachine(), RVLocs);
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CCState CCInfo(CC, isVarArg, getTargetMachine(), RVLocs);
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// Analize return values of ISD::RET
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CCInfo.AnalyzeReturn(Op.Val, RetCC_Mips);
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@ -495,7 +524,8 @@ LowerRET(SDOperand Op, SelectionDAG &DAG)
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// the regs to the liveout set for the function.
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if (DAG.getMachineFunction().liveout_empty()) {
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for (unsigned i = 0; i != RVLocs.size(); ++i)
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DAG.getMachineFunction().addLiveOut(RVLocs[i].getLocReg());
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if (RVLocs[i].isRegLoc())
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DAG.getMachineFunction().addLiveOut(RVLocs[i].getLocReg());
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}
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// The chain is always operand #0
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