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Convert ConstantFoldGetElementPtr to use ArrayRef.

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llvm-svn: 135483
This commit is contained in:
Jay Foad 2011-07-19 15:30:30 +00:00
parent bbbf29aab7
commit 6d007bef3c
3 changed files with 25 additions and 27 deletions
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45
lib/VMCore/ConstantFold.cpp
View File

@ -2166,31 +2166,30 @@ static bool isInBoundsIndices(IndexTy const *Idxs, size_t NumIdx) {
template<typename IndexTy>
static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
bool inBounds,
IndexTy const *Idxs,
unsigned NumIdx) {
if (NumIdx == 0) return C;
ArrayRef<IndexTy> Idxs) {
if (Idxs.empty()) return C;
Constant *Idx0 = cast<Constant>(Idxs[0]);
if ((NumIdx == 1 && Idx0->isNullValue()))
if ((Idxs.size() == 1 && Idx0->isNullValue()))
return C;
if (isa<UndefValue>(C)) {
PointerType *Ptr = cast<PointerType>(C->getType());
Type *Ty = GetElementPtrInst::getIndexedType(Ptr, Idxs, Idxs+NumIdx);
Type *Ty = GetElementPtrInst::getIndexedType(Ptr, Idxs.begin(), Idxs.end());
assert(Ty != 0 && "Invalid indices for GEP!");
return UndefValue::get(PointerType::get(Ty, Ptr->getAddressSpace()));
}
if (C->isNullValue()) {
bool isNull = true;
for (unsigned i = 0, e = NumIdx; i != e; ++i)
for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
if (!cast<Constant>(Idxs[i])->isNullValue()) {
isNull = false;
break;
}
if (isNull) {
PointerType *Ptr = cast<PointerType>(C->getType());
Type *Ty = GetElementPtrInst::getIndexedType(Ptr, Idxs,
Idxs+NumIdx);
Type *Ty = GetElementPtrInst::getIndexedType(Ptr, Idxs.begin(),
Idxs.end());
assert(Ty != 0 && "Invalid indices for GEP!");
return ConstantPointerNull::get(PointerType::get(Ty,
Ptr->getAddressSpace()));
@ -2210,7 +2209,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
if ((LastTy && LastTy->isArrayTy()) || Idx0->isNullValue()) {
SmallVector<Value*, 16> NewIndices;
NewIndices.reserve(NumIdx + CE->getNumOperands());
NewIndices.reserve(Idxs.size() + CE->getNumOperands());
for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
NewIndices.push_back(CE->getOperand(i));
@ -2232,7 +2231,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
}
NewIndices.push_back(Combined);
NewIndices.append(Idxs+1, Idxs+NumIdx);
NewIndices.append(Idxs.begin() + 1, Idxs.end());
return (inBounds && cast<GEPOperator>(CE)->isInBounds()) ?
ConstantExpr::getInBoundsGetElementPtr(CE->getOperand(0),
&NewIndices[0],
@ -2248,7 +2247,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
// i64 0, i64 0)
// To: i32* getelementptr ([3 x i32]* %X, i64 0, i64 0)
//
if (CE->isCast() && NumIdx > 1 && Idx0->isNullValue()) {
if (CE->isCast() && Idxs.size() > 1 && Idx0->isNullValue()) {
if (PointerType *SPT =
dyn_cast<PointerType>(CE->getOperand(0)->getType()))
if (ArrayType *SAT = dyn_cast<ArrayType>(SPT->getElementType()))
@ -2257,9 +2256,9 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
if (CAT->getElementType() == SAT->getElementType())
return inBounds ?
ConstantExpr::getInBoundsGetElementPtr(
(Constant*)CE->getOperand(0), Idxs, NumIdx) :
(Constant*)CE->getOperand(0), Idxs.data(), Idxs.size()) :
ConstantExpr::getGetElementPtr(
(Constant*)CE->getOperand(0), Idxs, NumIdx);
(Constant*)CE->getOperand(0), Idxs.data(), Idxs.size());
}
}
@ -2270,7 +2269,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
SmallVector<Constant *, 8> NewIdxs;
Type *Ty = C->getType();
Type *Prev = 0;
for (unsigned i = 0; i != NumIdx;
for (unsigned i = 0, e = Idxs.size(); i != e;
Prev = Ty, Ty = cast<CompositeType>(Ty)->getTypeAtIndex(Idxs[i]), ++i) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(Idxs[i])) {
if (ArrayType *ATy = dyn_cast<ArrayType>(Ty))
@ -2280,7 +2279,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
if (isa<SequentialType>(Prev)) {
// It's out of range, but we can factor it into the prior
// dimension.
NewIdxs.resize(NumIdx);
NewIdxs.resize(Idxs.size());
ConstantInt *Factor = ConstantInt::get(CI->getType(),
ATy->getNumElements());
NewIdxs[i] = ConstantExpr::getSRem(CI, Factor);
@ -2312,7 +2311,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
// If we did any factoring, start over with the adjusted indices.
if (!NewIdxs.empty()) {
for (unsigned i = 0; i != NumIdx; ++i)
for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
if (!NewIdxs[i]) NewIdxs[i] = cast<Constant>(Idxs[i]);
return inBounds ?
ConstantExpr::getInBoundsGetElementPtr(C, NewIdxs.data(),
@ -2323,22 +2322,20 @@ static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
// If all indices are known integers and normalized, we can do a simple
// check for the "inbounds" property.
if (!Unknown && !inBounds &&
isa<GlobalVariable>(C) && isInBoundsIndices(Idxs, NumIdx))
return ConstantExpr::getInBoundsGetElementPtr(C, Idxs, NumIdx);
isa<GlobalVariable>(C) && isInBoundsIndices(Idxs.data(), Idxs.size()))
return ConstantExpr::getInBoundsGetElementPtr(C, Idxs.data(), Idxs.size());
return 0;
}
Constant *llvm::ConstantFoldGetElementPtr(Constant *C,
bool inBounds,
Constant* const *Idxs,
unsigned NumIdx) {
return ConstantFoldGetElementPtrImpl(C, inBounds, Idxs, NumIdx);
ArrayRef<Constant *> Idxs) {
return ConstantFoldGetElementPtrImpl(C, inBounds, Idxs);
}
Constant *llvm::ConstantFoldGetElementPtr(Constant *C,
bool inBounds,
Value* const *Idxs,
unsigned NumIdx) {
return ConstantFoldGetElementPtrImpl(C, inBounds, Idxs, NumIdx);
ArrayRef<Value *> Idxs) {
return ConstantFoldGetElementPtrImpl(C, inBounds, Idxs);
}

4
lib/VMCore/ConstantFold.h
View File

@ -48,9 +48,9 @@ namespace llvm {
Constant *ConstantFoldCompareInstruction(unsigned short predicate,
Constant *C1, Constant *C2);
Constant *ConstantFoldGetElementPtr(Constant *C, bool inBounds,
Constant* const *Idxs, unsigned NumIdx);
ArrayRef<Constant *> Idxs);
Constant *ConstantFoldGetElementPtr(Constant *C, bool inBounds,
Value* const *Idxs, unsigned NumIdx);
ArrayRef<Value *> Idxs);
} // End llvm namespace
#endif

3
lib/VMCore/Constants.cpp
View File

@ -1594,7 +1594,8 @@ Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
unsigned NumIdx, bool InBounds) {
if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs, NumIdx))
if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds,
makeArrayRef(Idxs, NumIdx)))
return FC; // Fold a few common cases.
// Get the result type of the getelementptr!