return false;
}
+bool Constant::isOneValue() const {
+ // Check for 1 integers
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
+ return CI->isOne();
+
+ // Check for FP which are bitcasted from 1 integers
+ if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
+ return CFP->getValueAPF().bitcastToAPInt() == 1;
+
+ // Check for constant vectors which are splats of 1 values.
+ if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
+ if (Constant *Splat = CV->getSplatValue())
+ return Splat->isOneValue();
+
+ // Check for constant vectors which are splats of 1 values.
+ if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
+ if (Constant *Splat = CV->getSplatValue())
+ return Splat->isOneValue();
+
+ return false;
+}
+
+bool Constant::isMinSignedValue() const {
+ // Check for INT_MIN integers
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
+ return CI->isMinValue(/*isSigned=*/true);
+
+ // Check for FP which are bitcasted from INT_MIN integers
+ if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
+ return CFP->getValueAPF().bitcastToAPInt().isMinSignedValue();
+
+ // Check for constant vectors which are splats of INT_MIN values.
+ if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
+ if (Constant *Splat = CV->getSplatValue())
+ return Splat->isMinSignedValue();
+
+ // Check for constant vectors which are splats of INT_MIN values.
+ if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
+ if (Constant *Splat = CV->getSplatValue())
+ return Splat->isMinSignedValue();
+
+ return false;
+}
+
// Constructor to create a '0' constant of arbitrary type...
Constant *Constant::getNullValue(Type *Ty) {
switch (Ty->getTypeID()) {
return canTrapImpl(this, NonTrappingOps);
}
-/// isThreadDependent - Return true if the value can vary between threads.
-bool Constant::isThreadDependent() const {
- SmallPtrSet<const Constant*, 64> Visited;
- SmallVector<const Constant*, 64> WorkList;
- WorkList.push_back(this);
- Visited.insert(this);
+/// Check if C contains a GlobalValue for which Predicate is true.
+static bool
+ConstHasGlobalValuePredicate(const Constant *C,
+ bool (*Predicate)(const GlobalValue *)) {
+ SmallPtrSet<const Constant *, 8> Visited;
+ SmallVector<const Constant *, 8> WorkList;
+ WorkList.push_back(C);
+ Visited.insert(C);
while (!WorkList.empty()) {
- const Constant *C = WorkList.pop_back_val();
-
- if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
- if (GV->isThreadLocal())
+ const Constant *WorkItem = WorkList.pop_back_val();
+ if (const auto *GV = dyn_cast<GlobalValue>(WorkItem))
+ if (Predicate(GV))
return true;
- }
-
- for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
- const Constant *D = dyn_cast<Constant>(C->getOperand(I));
- if (!D)
+ for (const Value *Op : WorkItem->operands()) {
+ const Constant *ConstOp = dyn_cast<Constant>(Op);
+ if (!ConstOp)
continue;
- if (Visited.insert(D))
- WorkList.push_back(D);
+ if (Visited.insert(ConstOp))
+ WorkList.push_back(ConstOp);
}
}
-
return false;
}
-/// isConstantUsed - Return true if the constant has users other than constant
-/// exprs and other dangling things.
+/// Return true if the value can vary between threads.
+bool Constant::isThreadDependent() const {
+ auto DLLImportPredicate = [](const GlobalValue *GV) {
+ return GV->isThreadLocal();
+ };
+ return ConstHasGlobalValuePredicate(this, DLLImportPredicate);
+}
+
+bool Constant::isDLLImportDependent() const {
+ auto DLLImportPredicate = [](const GlobalValue *GV) {
+ return GV->hasDLLImportStorageClass();
+ };
+ return ConstHasGlobalValuePredicate(this, DLLImportPredicate);
+}
+
+/// Return true if the constant has users other than constant exprs and other
+/// dangling things.
bool Constant::isConstantUsed() const {
for (const User *U : users()) {
const Constant *UC = dyn_cast<Constant>(U);
}
Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
+ if (Constant *C = getImpl(Ty, V))
+ return C;
+ return Ty->getContext().pImpl->ArrayConstants.getOrCreate(Ty, V);
+}
+Constant *ConstantArray::getImpl(ArrayType *Ty, ArrayRef<Constant*> V) {
// Empty arrays are canonicalized to ConstantAggregateZero.
if (V.empty())
return ConstantAggregateZero::get(Ty);
assert(V[i]->getType() == Ty->getElementType() &&
"Wrong type in array element initializer");
}
- LLVMContextImpl *pImpl = Ty->getContext().pImpl;
// If this is an all-zero array, return a ConstantAggregateZero object. If
// all undef, return an UndefValue, if "all simple", then return a
}
// Otherwise, we really do want to create a ConstantArray.
- return pImpl->ArrayConstants.getOrCreate(Ty, V);
+ return nullptr;
}
/// getTypeForElements - Return an anonymous struct type to use for a constant
// ConstantVector accessors.
Constant *ConstantVector::get(ArrayRef<Constant*> V) {
+ if (Constant *C = getImpl(V))
+ return C;
+ VectorType *Ty = VectorType::get(V.front()->getType(), V.size());
+ return Ty->getContext().pImpl->VectorConstants.getOrCreate(Ty, V);
+}
+Constant *ConstantVector::getImpl(ArrayRef<Constant*> V) {
assert(!V.empty() && "Vectors can't be empty");
VectorType *T = VectorType::get(V.front()->getType(), V.size());
- LLVMContextImpl *pImpl = T->getContext().pImpl;
// If this is an all-undef or all-zero vector, return a
// ConstantAggregateZero or UndefValue.
// Otherwise, the element type isn't compatible with ConstantDataVector, or
// the operand list constants a ConstantExpr or something else strange.
- return pImpl->VectorConstants.getOrCreate(T, V);
+ return nullptr;
}
Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
// and return early.
BlockAddress *&NewBA =
getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
- if (!NewBA) {
- getBasicBlock()->AdjustBlockAddressRefCount(-1);
-
- // Remove the old entry, this can't cause the map to rehash (just a
- // tombstone will get added).
- getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
- getBasicBlock()));
- NewBA = this;
- setOperand(0, NewF);
- setOperand(1, NewBB);
- getBasicBlock()->AdjustBlockAddressRefCount(1);
+ if (NewBA) {
+ replaceUsesOfWithOnConstantImpl(NewBA);
return;
}
- // Otherwise, I do need to replace this with an existing value.
- assert(NewBA != this && "I didn't contain From!");
-
- // Everyone using this now uses the replacement.
- replaceAllUsesWith(NewBA);
+ getBasicBlock()->AdjustBlockAddressRefCount(-1);
- destroyConstant();
+ // Remove the old entry, this can't cause the map to rehash (just a
+ // tombstone will get added).
+ getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
+ getBasicBlock()));
+ NewBA = this;
+ setOperand(0, NewF);
+ setOperand(1, NewBB);
+ getBasicBlock()->AdjustBlockAddressRefCount(1);
}
//---- ConstantExpr::get() implementations.
LLVMContextImpl *pImpl = Ty->getContext().pImpl;
// Look up the constant in the table first to ensure uniqueness.
- ExprMapKeyType Key(opc, C);
+ ConstantExprKeyType Key(opc, C);
return pImpl->ExprConstants.getOrCreate(Ty, Key);
}
return FC; // Fold a few common cases.
Constant *ArgVec[] = { C1, C2 };
- ExprMapKeyType Key(Opcode, ArgVec, 0, Flags);
+ ConstantExprKeyType Key(Opcode, ArgVec, 0, Flags);
LLVMContextImpl *pImpl = C1->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
return SC; // Fold common cases
Constant *ArgVec[] = { C, V1, V2 };
- ExprMapKeyType Key(Instruction::Select, ArgVec);
+ ConstantExprKeyType Key(Instruction::Select, ArgVec);
LLVMContextImpl *pImpl = C->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
"getelementptr index type missmatch");
ArgVec.push_back(cast<Constant>(Idxs[i]));
}
- const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
- InBounds ? GEPOperator::IsInBounds : 0);
+ const ConstantExprKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
+ InBounds ? GEPOperator::IsInBounds : 0);
LLVMContextImpl *pImpl = C->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
// Look up the constant in the table first to ensure uniqueness
Constant *ArgVec[] = { LHS, RHS };
// Get the key type with both the opcode and predicate
- const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
+ const ConstantExprKeyType Key(Instruction::ICmp, ArgVec, pred);
Type *ResultTy = Type::getInt1Ty(LHS->getContext());
if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
// Look up the constant in the table first to ensure uniqueness
Constant *ArgVec[] = { LHS, RHS };
// Get the key type with both the opcode and predicate
- const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
+ const ConstantExprKeyType Key(Instruction::FCmp, ArgVec, pred);
Type *ResultTy = Type::getInt1Ty(LHS->getContext());
if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
// Look up the constant in the table first to ensure uniqueness
Constant *ArgVec[] = { Val, Idx };
- const ExprMapKeyType Key(Instruction::ExtractElement, ArgVec);
+ const ConstantExprKeyType Key(Instruction::ExtractElement, ArgVec);
LLVMContextImpl *pImpl = Val->getContext().pImpl;
Type *ReqTy = Val->getType()->getVectorElementType();
return FC; // Fold a few common cases.
// Look up the constant in the table first to ensure uniqueness
Constant *ArgVec[] = { Val, Elt, Idx };
- const ExprMapKeyType Key(Instruction::InsertElement, ArgVec);
+ const ConstantExprKeyType Key(Instruction::InsertElement, ArgVec);
LLVMContextImpl *pImpl = Val->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
// Look up the constant in the table first to ensure uniqueness
Constant *ArgVec[] = { V1, V2, Mask };
- const ExprMapKeyType Key(Instruction::ShuffleVector, ArgVec);
+ const ConstantExprKeyType Key(Instruction::ShuffleVector, ArgVec);
LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
return FC;
Constant *ArgVec[] = { Agg, Val };
- const ExprMapKeyType Key(Instruction::InsertValue, ArgVec, 0, 0, Idxs);
+ const ConstantExprKeyType Key(Instruction::InsertValue, ArgVec, 0, 0, Idxs);
LLVMContextImpl *pImpl = Agg->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
return FC;
Constant *ArgVec[] = { Agg };
- const ExprMapKeyType Key(Instruction::ExtractValue, ArgVec, 0, 0, Idxs);
+ const ConstantExprKeyType Key(Instruction::ExtractValue, ArgVec, 0, 0, Idxs);
LLVMContextImpl *pImpl = Agg->getContext().pImpl;
return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
/// work, but would be really slow because it would have to unique each updated
/// array instance.
///
+void Constant::replaceUsesOfWithOnConstantImpl(Constant *Replacement) {
+ // I do need to replace this with an existing value.
+ assert(Replacement != this && "I didn't contain From!");
+
+ // Everyone using this now uses the replacement.
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
+}
+
void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
Use *U) {
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
LLVMContextImpl *pImpl = getType()->getContext().pImpl;
SmallVector<Constant*, 8> Values;
- LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup;
- Lookup.first = cast<ArrayType>(getType());
Values.reserve(getNumOperands()); // Build replacement array.
// Fill values with the modified operands of the constant array. Also,
AllSame &= Val == ToC;
}
- Constant *Replacement = nullptr;
if (AllSame && ToC->isNullValue()) {
- Replacement = ConstantAggregateZero::get(getType());
- } else if (AllSame && isa<UndefValue>(ToC)) {
- Replacement = UndefValue::get(getType());
- } else {
- // Check to see if we have this array type already.
- Lookup.second = makeArrayRef(Values);
- LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
- pImpl->ArrayConstants.find(Lookup);
+ replaceUsesOfWithOnConstantImpl(ConstantAggregateZero::get(getType()));
+ return;
+ }
+ if (AllSame && isa<UndefValue>(ToC)) {
+ replaceUsesOfWithOnConstantImpl(UndefValue::get(getType()));
+ return;
+ }
- if (I != pImpl->ArrayConstants.map_end()) {
- Replacement = I->first;
- } else {
- // Okay, the new shape doesn't exist in the system yet. Instead of
- // creating a new constant array, inserting it, replaceallusesof'ing the
- // old with the new, then deleting the old... just update the current one
- // in place!
- pImpl->ArrayConstants.remove(this);
-
- // Update to the new value. Optimize for the case when we have a single
- // operand that we're changing, but handle bulk updates efficiently.
- if (NumUpdated == 1) {
- unsigned OperandToUpdate = U - OperandList;
- assert(getOperand(OperandToUpdate) == From &&
- "ReplaceAllUsesWith broken!");
- setOperand(OperandToUpdate, ToC);
- } else {
- for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
- if (getOperand(i) == From)
- setOperand(i, ToC);
- }
- pImpl->ArrayConstants.insert(this);
- return;
- }
+ // Check for any other type of constant-folding.
+ if (Constant *C = getImpl(getType(), Values)) {
+ replaceUsesOfWithOnConstantImpl(C);
+ return;
}
- // Otherwise, I do need to replace this with an existing value.
- assert(Replacement != this && "I didn't contain From!");
+ // Check to see if we have this array type already.
+ LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup(
+ cast<ArrayType>(getType()), makeArrayRef(Values));
+ LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
+ pImpl->ArrayConstants.find(Lookup);
- // Everyone using this now uses the replacement.
- replaceAllUsesWith(Replacement);
+ if (I != pImpl->ArrayConstants.map_end()) {
+ replaceUsesOfWithOnConstantImpl(I->first);
+ return;
+ }
- // Delete the old constant!
- destroyConstant();
+ // Okay, the new shape doesn't exist in the system yet. Instead of
+ // creating a new constant array, inserting it, replaceallusesof'ing the
+ // old with the new, then deleting the old... just update the current one
+ // in place!
+ pImpl->ArrayConstants.remove(this);
+
+ // Update to the new value. Optimize for the case when we have a single
+ // operand that we're changing, but handle bulk updates efficiently.
+ if (NumUpdated == 1) {
+ unsigned OperandToUpdate = U - OperandList;
+ assert(getOperand(OperandToUpdate) == From &&
+ "ReplaceAllUsesWith broken!");
+ setOperand(OperandToUpdate, ToC);
+ } else {
+ for (unsigned I = 0, E = getNumOperands(); I != E; ++I)
+ if (getOperand(I) == From)
+ setOperand(I, ToC);
+ }
+ pImpl->ArrayConstants.insert(this);
}
void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
SmallVector<Constant*, 8> Values;
- LLVMContextImpl::StructConstantsTy::LookupKey Lookup;
- Lookup.first = cast<StructType>(getType());
Values.reserve(getNumOperands()); // Build replacement struct.
// Fill values with the modified operands of the constant struct. Also,
LLVMContextImpl *pImpl = getContext().pImpl;
- Constant *Replacement = nullptr;
if (isAllZeros) {
- Replacement = ConstantAggregateZero::get(getType());
- } else if (isAllUndef) {
- Replacement = UndefValue::get(getType());
- } else {
- // Check to see if we have this struct type already.
- Lookup.second = makeArrayRef(Values);
- LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
+ replaceUsesOfWithOnConstantImpl(ConstantAggregateZero::get(getType()));
+ return;
+ }
+ if (isAllUndef) {
+ replaceUsesOfWithOnConstantImpl(UndefValue::get(getType()));
+ return;
+ }
+
+ // Check to see if we have this struct type already.
+ LLVMContextImpl::StructConstantsTy::LookupKey Lookup(
+ cast<StructType>(getType()), makeArrayRef(Values));
+ LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
pImpl->StructConstants.find(Lookup);
- if (I != pImpl->StructConstants.map_end()) {
- Replacement = I->first;
- } else {
- // Okay, the new shape doesn't exist in the system yet. Instead of
- // creating a new constant struct, inserting it, replaceallusesof'ing the
- // old with the new, then deleting the old... just update the current one
- // in place!
- pImpl->StructConstants.remove(this);
-
- // Update to the new value.
- setOperand(OperandToUpdate, ToC);
- pImpl->StructConstants.insert(this);
- return;
- }
+ if (I != pImpl->StructConstants.map_end()) {
+ replaceUsesOfWithOnConstantImpl(I->first);
+ return;
}
- assert(Replacement != this && "I didn't contain From!");
-
- // Everyone using this now uses the replacement.
- replaceAllUsesWith(Replacement);
+ // Okay, the new shape doesn't exist in the system yet. Instead of
+ // creating a new constant struct, inserting it, replaceallusesof'ing the
+ // old with the new, then deleting the old... just update the current one
+ // in place!
+ pImpl->StructConstants.remove(this);
- // Delete the old constant!
- destroyConstant();
+ // Update to the new value.
+ setOperand(OperandToUpdate, ToC);
+ pImpl->StructConstants.insert(this);
}
void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
Use *U) {
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
+ Constant *ToC = cast<Constant>(To);
SmallVector<Constant*, 8> Values;
Values.reserve(getNumOperands()); // Build replacement array...
+ unsigned NumUpdated = 0;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
Constant *Val = getOperand(i);
- if (Val == From) Val = cast<Constant>(To);
+ if (Val == From) {
+ ++NumUpdated;
+ Val = ToC;
+ }
Values.push_back(Val);
}
- Constant *Replacement = get(Values);
- assert(Replacement != this && "I didn't contain From!");
+ if (Constant *C = getImpl(Values)) {
+ replaceUsesOfWithOnConstantImpl(C);
+ return;
+ }
- // Everyone using this now uses the replacement.
- replaceAllUsesWith(Replacement);
+ // Update to the new value. Optimize for the case when we have a single
+ // operand that we're changing, but handle bulk updates efficiently.
+ auto &pImpl = getType()->getContext().pImpl;
+ pImpl->VectorConstants.remove(this);
- // Delete the old constant!
- destroyConstant();
+ if (NumUpdated == 1) {
+ unsigned OperandToUpdate = U - OperandList;
+ assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
+ setOperand(OperandToUpdate, ToC);
+ } else {
+ for (unsigned I = 0, E = getNumOperands(); I != E; ++I)
+ if (getOperand(I) == From)
+ setOperand(I, ToC);
+ }
+
+ pImpl->VectorConstants.insert(this);
}
void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
Constant *Replacement = getWithOperands(NewOps);
assert(Replacement != this && "I didn't contain From!");
+ // Check if Replacement has no users (and is the same type). Ideally, this
+ // check would be done *before* creating Replacement, but threading this
+ // through constant-folding isn't trivial.
+ if (canBecomeReplacement(Replacement)) {
+ // Avoid unnecessary RAUW traffic.
+ auto &ExprConstants = getType()->getContext().pImpl->ExprConstants;
+ ExprConstants.remove(this);
+
+ auto *CE = cast<ConstantExpr>(Replacement);
+ for (unsigned I = 0, E = getNumOperands(); I != E; ++I)
+ // Only set the operands that have actually changed.
+ if (getOperand(I) != CE->getOperand(I))
+ setOperand(I, CE->getOperand(I));
+
+ CE->destroyConstant();
+ ExprConstants.insert(this);
+ return;
+ }
+
// Everyone using this now uses the replacement.
replaceAllUsesWith(Replacement);
destroyConstant();
}
+bool ConstantExpr::canBecomeReplacement(const Constant *Replacement) const {
+ // If Replacement already has users, use it regardless.
+ if (!Replacement->use_empty())
+ return false;
+
+ // Check for anything that could have changed during constant-folding.
+ if (getValueID() != Replacement->getValueID())
+ return false;
+ const auto *CE = cast<ConstantExpr>(Replacement);
+ if (getOpcode() != CE->getOpcode())
+ return false;
+ if (getNumOperands() != CE->getNumOperands())
+ return false;
+ if (getRawSubclassOptionalData() != CE->getRawSubclassOptionalData())
+ return false;
+ if (isCompare())
+ if (getPredicate() != CE->getPredicate())
+ return false;
+ if (hasIndices())
+ if (getIndices() != CE->getIndices())
+ return false;
+
+ return true;
+}
+
Instruction *ConstantExpr::getAsInstruction() {
SmallVector<Value*,4> ValueOperands;
for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
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