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Move transformation of JmpLink and related nodes done during instruction selection to Legalize phase.

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llvm-svn: 128830
This commit is contained in:
Akira Hatanaka 2011-04-04 17:11:07 +00:00
parent 8eef3feba8
commit 54ae678397
2 changed files with 27 additions and 59 deletions
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58
lib/Target/Mips/MipsISelDAGToDAG.cpp
View File

@ -122,7 +122,8 @@ SelectAddr(SDValue Addr, SDValue &Offset, SDValue &Base) {
if ((Addr.getOpcode() == ISD::TargetGlobalAddress) ||
(Addr.getOpcode() == ISD::TargetConstantPool) ||
(Addr.getOpcode() == ISD::TargetJumpTable) ||
(Addr.getOpcode() == ISD::TargetBlockAddress)) {
(Addr.getOpcode() == ISD::TargetBlockAddress) ||
(Addr.getOpcode() == ISD::TargetExternalSymbol)) {
Base = CurDAG->getRegister(Mips::GP, MVT::i32);
Offset = Addr;
return true;
@ -444,61 +445,6 @@ SDNode* MipsDAGToDAGISel::Select(SDNode *Node) {
return ResNode;
// Other cases are autogenerated.
break;
/// Handle direct and indirect calls when using PIC. On PIC, when
/// GOT is smaller than about 64k (small code) the GA target is
/// loaded with only one instruction. Otherwise GA's target must
/// be loaded with 3 instructions.
case MipsISD::JmpLink: {
if (TM.getRelocationModel() == Reloc::PIC_) {
unsigned LastOpNum = Node->getNumOperands()-1;
SDValue Chain = Node->getOperand(0);
SDValue Callee = Node->getOperand(1);
SDValue InFlag;
// Skip the incomming flag if present
if (Node->getOperand(LastOpNum).getValueType() == MVT::Glue)
LastOpNum--;
if ( (isa<GlobalAddressSDNode>(Callee)) ||
(isa<ExternalSymbolSDNode>(Callee)) )
{
/// Direct call for global addresses and external symbols
SDValue GPReg = CurDAG->getRegister(Mips::GP, MVT::i32);
// Use load to get GOT target
SDValue Ops[] = { Callee, GPReg, Chain };
SDValue Load = SDValue(CurDAG->getMachineNode(Mips::LW, dl, MVT::i32,
MVT::Other, Ops, 3), 0);
Chain = Load.getValue(1);
// Call target must be on T9
Chain = CurDAG->getCopyToReg(Chain, dl, Mips::T9, Load, InFlag);
} else
/// Indirect call
Chain = CurDAG->getCopyToReg(Chain, dl, Mips::T9, Callee, InFlag);
// Map the JmpLink operands to JALR
SDVTList NodeTys = CurDAG->getVTList(MVT::Other, MVT::Glue);
SmallVector<SDValue, 8> Ops;
Ops.push_back(CurDAG->getRegister(Mips::T9, MVT::i32));
for (unsigned i = 2, e = LastOpNum+1; i != e; ++i)
Ops.push_back(Node->getOperand(i));
Ops.push_back(Chain);
Ops.push_back(Chain.getValue(1));
// Emit Jump and Link Register
SDNode *ResNode = CurDAG->getMachineNode(Mips::JALR, dl, NodeTys,
&Ops[0], Ops.size());
// Replace Chain and InFlag
ReplaceUses(SDValue(Node, 0), SDValue(ResNode, 0));
ReplaceUses(SDValue(Node, 1), SDValue(ResNode, 1));
return ResNode;
}
}
}
// Select the default instruction

28
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -1201,12 +1201,34 @@ MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
// direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
// node so that legalize doesn't hack it.
unsigned char OpFlag = IsPIC ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
bool LoadSymAddr = false;
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
getPointerTy(), 0, OpFlag);
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
getPointerTy(), 0, OpFlag);
LoadSymAddr = true;
}
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
getPointerTy(), OpFlag);
LoadSymAddr = true;
}
// Create nodes that load address of callee and copy it to T9
if (IsPIC) {
if (LoadSymAddr) {
// load callee address
Callee = DAG.getLoad(MVT::i32, dl, Chain, Callee,
MachinePointerInfo::getGOT(),
false, false, 0);
Chain = Callee.getValue(1);
}
// copy to T9
Chain = DAG.getCopyToReg(Chain, dl, Mips::T9, Callee, SDValue(0, 0));
InFlag = Chain.getValue(1);
Callee = DAG.getRegister(Mips::T9, MVT::i32);
}
// MipsJmpLink = #chain, #target_address, #opt_in_flags...
// = Chain, Callee, Reg#1, Reg#2, ...