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implement support for calls 

llvm-svn: 23026
This commit is contained in:
Chris Lattner 2005-08-24 22:45:17 +00:00
parent d7ee4d8671
commit d83cd354bd
1 changed files with 99 additions and 3 deletions
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102
llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -917,7 +917,7 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
case MVT::i16: Opc = isIdx ? PPC::STHX : PPC::STH; break;
}
}
CurDAG->SelectNodeTo(N, MVT::Other, Opc, Select(N->getOperand(1)),
AddrOp1, AddrOp2, Select(N->getOperand(0)));
break;
@ -928,10 +928,106 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
unsigned Amt = cast<ConstantSDNode>(N->getOperand(1))->getValue();
unsigned Opc = N->getOpcode() == ISD::CALLSEQ_START ?
PPC::ADJCALLSTACKDOWN : PPC::ADJCALLSTACKUP;
CurDAG->SelectNodeTo(N, MVT::Other, Opc, Select(N->getOperand(0)),
getI32Imm(Amt));
CurDAG->SelectNodeTo(N, MVT::Other, Opc,
getI32Imm(Amt), Select(N->getOperand(0)));
break;
}
case ISD::CALL:
case ISD::TAILCALL: {
SDOperand Chain = Select(N->getOperand(0));
unsigned CallOpcode;
std::vector<SDOperand> CallOperands;
if (GlobalAddressSDNode *GASD =
dyn_cast<GlobalAddressSDNode>(N->getOperand(1))) {
CallOpcode = PPC::CALLpcrel;
CallOperands.push_back(CurDAG->getTargetGlobalAddress(GASD->getGlobal(),
MVT::i32));
} else if (ExternalSymbolSDNode *ESSDN =
dyn_cast<ExternalSymbolSDNode>(N->getOperand(1))) {
CallOpcode = PPC::CALLpcrel;
CallOperands.push_back(N->getOperand(1));
} else {
// Copy the callee address into the CTR register.
SDOperand Callee = Select(N->getOperand(1));
Chain = CurDAG->getTargetNode(PPC::MTCTR, MVT::Other, Callee, Chain);
// Copy the callee address into R12 on darwin.
SDOperand R12 = CurDAG->getRegister(PPC::R12, MVT::i32);
Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, R12, Callee, Chain);
CallOperands.push_back(getI32Imm(20)); // Information to encode indcall
CallOperands.push_back(getI32Imm(0)); // Information to encode indcall
CallOperands.push_back(R12);
CallOpcode = PPC::CALLindirect;
}
unsigned GPR_idx = 0, FPR_idx = 0;
static const unsigned GPR[] = {
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
static const unsigned FPR[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
};
for (unsigned i = 2, e = N->getNumOperands(); i != e; ++i)
if (N->getOperand(i).getOpcode() != ISD::UNDEF) {
unsigned DestReg = 0;
MVT::ValueType RegTy;
if (N->getOperand(i).getValueType() == MVT::i32) {
assert(GPR_idx < 8 && "Too many int args");
DestReg = GPR[GPR_idx++];
RegTy = MVT::i32;
} else {
assert(MVT::isFloatingPoint(Op.getValueType()) &&
"Unpromoted integer arg?");
assert(FPR_idx < 13 && "Too many fp args");
DestReg = FPR[FPR_idx++];
RegTy = MVT::f64; // Even if this is really f32!
}
SDOperand Reg = CurDAG->getRegister(DestReg, RegTy);
Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg,
Select(N->getOperand(i)));
CallOperands.push_back(Reg);
}
// Finally, once everything is in registers to pass to the call, emit the
// call itself.
CallOperands.push_back(Chain);
Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, CallOperands);
std::vector<SDOperand> CallResults;
// If the call has results, copy the values out of the ret val registers.
switch (N->getValueType(0)) {
default: assert(0 && "Unexpected ret value!");
case MVT::Other: break;
case MVT::i32:
if (N->getValueType(1) == MVT::i32) {
Chain = CurDAG->getCopyFromReg(Chain, PPC::R4, MVT::i32).getValue(1);
CallResults.push_back(Chain.getValue(0));
Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32).getValue(1);
CallResults.push_back(Chain.getValue(0));
} else {
Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32).getValue(1);
CallResults.push_back(Chain.getValue(0));
}
break;
case MVT::f32:
case MVT::f64:
Chain = CurDAG->getCopyFromReg(Chain, PPC::F1, MVT::f64).getValue(1);
CallResults.push_back(Chain.getValue(0));
break;
}
CallResults.push_back(Chain);
CurDAG->ReplaceAllUsesWith(N, CallResults);
return CallResults[Op.ResNo];
}
case ISD::RET: {
SDOperand Chain = Select(N->getOperand(0)); // Token chain.