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Simplify the dead argument handling code. 

llvm-svn: 28334
This commit is contained in:
Chris Lattner 2006-05-16 18:54:32 +00:00
parent 318f0d2122
commit 76c47b50e7
1 changed files with 11 additions and 28 deletions
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39
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
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@ -761,7 +761,6 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
for (unsigned ArgNo = 0, e = Op.Val->getNumValues()-1; ArgNo != e; ++ArgNo) {
SDOperand ArgVal;
bool needsLoad = false;
bool ArgLive = !Op.Val->hasNUsesOfValue(0, ArgNo);
MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
unsigned ObjSize = MVT::getSizeInBits(ObjectVT)/8;
@ -773,13 +772,6 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
// All int arguments reserve stack space.
ArgOffset += 4;
if (!ArgLive) {
if (GPR_remaining > 0) {
--GPR_remaining;
++GPR_idx;
}
break;
}
if (GPR_remaining > 0) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
MF.addLiveIn(GPR[GPR_idx], VReg);
@ -802,13 +794,6 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
GPR_remaining -= delta;
GPR_idx += delta;
}
if (!ArgLive) {
if (FPR_remaining > 0) {
--FPR_remaining;
++FPR_idx;
}
break;
}
if (FPR_remaining > 0) {
unsigned VReg;
if (ObjectVT == MVT::f32)
@ -828,13 +813,6 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
case MVT::v8i16:
case MVT::v16i8:
// Note that vector arguments in registers don't reserve stack space.
if (!ArgLive) {
if (VR_remaining > 0) {
--VR_remaining;
++VR_idx;
}
break;
}
if (VR_remaining > 0) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::VRRCRegClass);
MF.addLiveIn(VR[VR_idx], VReg);
@ -853,14 +831,19 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
// We need to load the argument to a virtual register if we determined above
// that we ran out of physical registers of the appropriate type
if (needsLoad) {
int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset);
SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
ArgVal = DAG.getLoad(ObjectVT, Root, FIN,
DAG.getSrcValue(NULL));
// If the argument is actually used, emit a load from the right stack
// slot.
if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset);
SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
ArgVal = DAG.getLoad(ObjectVT, Root, FIN,
DAG.getSrcValue(NULL));
} else {
// Don't emit a dead load.
ArgVal = DAG.getNode(ISD::UNDEF, ObjectVT);
}
}
if (ArgVal.Val == 0)
ArgVal = DAG.getNode(ISD::UNDEF, ObjectVT);
ArgValues.push_back(ArgVal);
}