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Implement SROA of unions with mixed pointers/integers in them. This implements

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PR892 and Transforms/ScalarRepl/union-pointer.ll:test2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30825 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-08 23:53:04 +00:00
parent eab5bd32b6
commit c836333c3b
1 changed files with 16 additions and 10 deletions
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26
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -433,8 +433,7 @@ static bool MergeInType(const Type *In, const Type *&Accum,
if (In->getTypeID() > Accum->getTypeID())
Accum = In;
} else if (isa<PointerType>(In) && isa<PointerType>(Accum)) {
// Pointer unions just stay as a pointer.
// Nothing.
// Pointer unions just stay as one of the pointers.
} else if ((PTy = dyn_cast<PackedType>(Accum)) &&
PTy->getElementType() == In) {
// Accum is a vector, and we are accessing an element: ok.
@ -442,6 +441,13 @@ static bool MergeInType(const Type *In, const Type *&Accum,
PTy->getElementType() == Accum) {
// In is a vector, and accum is an element: ok, remember In.
Accum = In;
} else if (isa<PointerType>(In) && Accum->isIntegral()) {
// Pointer/Integer unions merge together as integers.
return MergeInType(TD.getIntPtrType(), Accum, TD);
} else if (isa<PointerType>(Accum) && In->isIntegral()) {
// Pointer/Integer unions merge together as integers.
Accum = TD.getIntPtrType();
return MergeInType(In, Accum, TD);
} else {
return true;
}
@ -503,7 +509,7 @@ const Type *SROA::CanConvertToScalar(Value *V, bool &IsNotTrivial) {
if (SubElt == 0) return 0;
if (SubElt != Type::VoidTy && SubElt->isInteger()) {
const Type *NewTy =
getUIntAtLeastAsBitAs(SubElt->getPrimitiveSizeInBits()+BitOffset);
getUIntAtLeastAsBitAs(TD.getTypeSize(SubElt)*8+BitOffset);
if (NewTy == 0 || MergeInType(NewTy, UsedType, TD)) return 0;
continue;
}
@ -591,6 +597,7 @@ void SROA::ConvertToScalar(AllocationInst *AI, const Type *ActualTy) {
/// shifted to the right. By the end of this, there should be no uses of Ptr.
void SROA::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI, unsigned Offset) {
bool isVectorInsert = isa<PackedType>(NewAI->getType()->getElementType());
const TargetData &TD = getAnalysis<TargetData>();
while (!Ptr->use_empty()) {
Instruction *User = cast<Instruction>(Ptr->use_back());
@ -600,12 +607,12 @@ void SROA::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI, unsigned Offset) {
if (NV->getType() != LI->getType()) {
if (const PackedType *PTy = dyn_cast<PackedType>(NV->getType())) {
// Must be an element access.
unsigned Elt = Offset/PTy->getElementType()->getPrimitiveSizeInBits();
unsigned Elt = Offset/(TD.getTypeSize(PTy->getElementType())*8);
NV = new ExtractElementInst(NV, ConstantUInt::get(Type::UIntTy, Elt),
"tmp", LI);
} else {
assert(NV->getType()->isInteger() && "Unknown promotion!");
if (Offset && Offset < NV->getType()->getPrimitiveSizeInBits())
if (Offset && Offset < TD.getTypeSize(NV->getType())*8)
NV = new ShiftInst(Instruction::Shr, NV,
ConstantUInt::get(Type::UByteTy, Offset),
LI->getName(), LI);
@ -626,7 +633,7 @@ void SROA::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI, unsigned Offset) {
if (const PackedType *PTy = dyn_cast<PackedType>(AllocaType)) {
// Must be an element insertion.
unsigned Elt = Offset/PTy->getElementType()->getPrimitiveSizeInBits();
unsigned Elt = Offset/(TD.getTypeSize(PTy->getElementType())*8);
SV = new InsertElementInst(Old, SV,
ConstantUInt::get(Type::UIntTy, Elt),
"tmp", SI);
@ -637,14 +644,13 @@ void SROA::ConvertUsesToScalar(Value *Ptr, AllocaInst *NewAI, unsigned Offset) {
SV = new CastInst(SV, SV->getType()->getUnsignedVersion(),
SV->getName(), SI);
SV = new CastInst(SV, Old->getType(), SV->getName(), SI);
if (Offset && Offset < SV->getType()->getPrimitiveSizeInBits())
if (Offset && Offset < TD.getTypeSize(SV->getType())*8)
SV = new ShiftInst(Instruction::Shl, SV,
ConstantUInt::get(Type::UByteTy, Offset),
SV->getName()+".adj", SI);
// Mask out the bits we are about to insert from the old value.
unsigned TotalBits = SV->getType()->getPrimitiveSizeInBits();
unsigned InsertBits =
SI->getOperand(0)->getType()->getPrimitiveSizeInBits();
unsigned TotalBits = TD.getTypeSize(SV->getType())*8;
unsigned InsertBits = TD.getTypeSize(SI->getOperand(0)->getType())*8;
if (TotalBits != InsertBits) {
assert(TotalBits > InsertBits);
uint64_t Mask = ~(((1ULL << InsertBits)-1) << Offset);