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Handle empty aggregate values.

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llvm-svn: 52150
This commit is contained in:
Dan Gohman 2008-06-09 15:21:47 +00:00
parent 7c97681798
commit d789392934
1 changed files with 22 additions and 21 deletions
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43
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -649,10 +649,6 @@ public:
void setCurrentBasicBlock(MachineBasicBlock *MBB) { CurMBB = MBB; } void setCurrentBasicBlock(MachineBasicBlock *MBB) { CurMBB = MBB; }
SDOperand getLoadFrom(const Type *Ty, SDOperand Ptr,
const Value *SV, SDOperand Root,
bool isVolatile, unsigned Alignment);
SDOperand getValue(const Value *V); SDOperand getValue(const Value *V);
void setValue(const Value *V, SDOperand NewN) { void setValue(const Value *V, SDOperand NewN) {
@ -1169,6 +1165,8 @@ SDOperand SelectionDAGLowering::getValue(const Value *V) {
assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) && assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) &&
"Unknown array constant!"); "Unknown array constant!");
unsigned NumElts = ATy->getNumElements(); unsigned NumElts = ATy->getNumElements();
if (NumElts == 0)
return SDOperand(); // empty array
MVT EltVT = TLI.getValueType(ATy->getElementType()); MVT EltVT = TLI.getValueType(ATy->getElementType());
SmallVector<SDOperand, 4> Constants(NumElts); SmallVector<SDOperand, 4> Constants(NumElts);
SmallVector<MVT, 4> ValueVTs(NumElts, EltVT); SmallVector<MVT, 4> ValueVTs(NumElts, EltVT);
@ -1189,6 +1187,8 @@ SDOperand SelectionDAGLowering::getValue(const Value *V) {
assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) && assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) &&
"Unknown struct constant!"); "Unknown struct constant!");
unsigned NumElts = STy->getNumElements(); unsigned NumElts = STy->getNumElements();
if (NumElts == 0)
return SDOperand(); // empty struct
SmallVector<SDOperand, 4> Constants(NumElts); SmallVector<SDOperand, 4> Constants(NumElts);
SmallVector<MVT, 4> ValueVTs(NumElts); SmallVector<MVT, 4> ValueVTs(NumElts);
for (unsigned i = 0, e = NumElts; i != e; ++i) { for (unsigned i = 0, e = NumElts; i != e; ++i) {
@ -2850,7 +2850,19 @@ void SelectionDAGLowering::visitAlloca(AllocaInst &I) {
} }
void SelectionDAGLowering::visitLoad(LoadInst &I) { void SelectionDAGLowering::visitLoad(LoadInst &I) {
SDOperand Ptr = getValue(I.getOperand(0)); const Value *SV = I.getOperand(0);
SDOperand Ptr = getValue(SV);
const Type *Ty = I.getType();
bool isVolatile = I.isVolatile();
unsigned Alignment = I.getAlignment();
SmallVector<MVT, 4> ValueVTs;
SmallVector<uint64_t, 4> Offsets;
ComputeValueVTs(TLI, Ty, ValueVTs, &Offsets);
unsigned NumValues = ValueVTs.size();
if (NumValues == 0)
return;
SDOperand Root; SDOperand Root;
if (I.isVolatile()) if (I.isVolatile())
@ -2860,19 +2872,6 @@ void SelectionDAGLowering::visitLoad(LoadInst &I) {
Root = DAG.getRoot(); Root = DAG.getRoot();
} }
setValue(&I, getLoadFrom(I.getType(), Ptr, I.getOperand(0),
Root, I.isVolatile(), I.getAlignment()));
}
SDOperand SelectionDAGLowering::getLoadFrom(const Type *Ty, SDOperand Ptr,
const Value *SV, SDOperand Root,
bool isVolatile,
unsigned Alignment) {
SmallVector<MVT, 4> ValueVTs;
SmallVector<uint64_t, 4> Offsets;
ComputeValueVTs(TLI, Ty, ValueVTs, &Offsets);
unsigned NumValues = ValueVTs.size();
SmallVector<SDOperand, 4> Values(NumValues); SmallVector<SDOperand, 4> Values(NumValues);
SmallVector<SDOperand, 4> Chains(NumValues); SmallVector<SDOperand, 4> Chains(NumValues);
MVT PtrVT = Ptr.getValueType(); MVT PtrVT = Ptr.getValueType();
@ -2893,9 +2892,9 @@ SDOperand SelectionDAGLowering::getLoadFrom(const Type *Ty, SDOperand Ptr,
else else
PendingLoads.push_back(Chain); PendingLoads.push_back(Chain);
return DAG.getNode(ISD::MERGE_VALUES, setValue(&I, DAG.getNode(ISD::MERGE_VALUES,
DAG.getVTList(&ValueVTs[0], NumValues), DAG.getVTList(&ValueVTs[0], NumValues),
&Values[0], NumValues); &Values[0], NumValues));
} }
@ -2909,6 +2908,8 @@ void SelectionDAGLowering::visitStore(StoreInst &I) {
SmallVector<uint64_t, 4> Offsets; SmallVector<uint64_t, 4> Offsets;
ComputeValueVTs(TLI, SrcV->getType(), ValueVTs, &Offsets); ComputeValueVTs(TLI, SrcV->getType(), ValueVTs, &Offsets);
unsigned NumValues = ValueVTs.size(); unsigned NumValues = ValueVTs.size();
if (NumValues == 0)
return;
SDOperand Root = getRoot(); SDOperand Root = getRoot();
SmallVector<SDOperand, 4> Chains(NumValues); SmallVector<SDOperand, 4> Chains(NumValues);