return ConstantAggregateZero::get(Ty);
default:
// Function, Label, or Opaque type?
- assert(0 && "Cannot create a null constant of that type!");
- return 0;
+ llvm_unreachable("Cannot create a null constant of that type!");
}
}
return UV->getElementValue(Elt);
if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
- return CDS->getElementAsConstant(Elt);
+ return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt) : 0;
return 0;
}
// ConstantXXX Classes
//===----------------------------------------------------------------------===//
+template <typename ItTy, typename EltTy>
+static bool rangeOnlyContains(ItTy Start, ItTy End, EltTy Elt) {
+ for (; Start != End; ++Start)
+ if (*Start != Elt)
+ return false;
+ return true;
+}
ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
: Constant(T, ConstantArrayVal,
}
Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
+ // Empty arrays are canonicalized to ConstantAggregateZero.
+ if (V.empty())
+ return ConstantAggregateZero::get(Ty);
+
for (unsigned i = 0, e = V.size(); i != e; ++i) {
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
- bool isAllZero = true;
- bool isUndef = false;
- if (!V.empty()) {
- Constant *C = V[0];
- isAllZero = C->isNullValue();
- isUndef = isa<UndefValue>(C);
-
- if (isAllZero || isUndef)
- for (unsigned i = 1, e = V.size(); i != e; ++i)
- if (V[i] != C) {
- isAllZero = false;
- isUndef = false;
- break;
- }
- }
-
- if (isAllZero)
- return ConstantAggregateZero::get(Ty);
- if (isUndef)
+
+ // If this is an all-zero array, return a ConstantAggregateZero object. If
+ // all undef, return an UndefValue, if "all simple", then return a
+ // ConstantDataArray.
+ Constant *C = V[0];
+ if (isa<UndefValue>(C) && rangeOnlyContains(V.begin(), V.end(), C))
return UndefValue::get(Ty);
- return pImpl->ArrayConstants.getOrCreate(Ty, V);
-}
-/// ConstantArray::get(const string&) - Return an array that is initialized to
-/// contain the specified string. If length is zero then a null terminator is
-/// added to the specified string so that it may be used in a natural way.
-/// Otherwise, the length parameter specifies how much of the string to use
-/// and it won't be null terminated.
-///
-Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
- bool AddNull) {
- SmallVector<Constant*, 8> ElementVals;
- ElementVals.reserve(Str.size() + size_t(AddNull));
- for (unsigned i = 0; i < Str.size(); ++i)
- ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
+ if (C->isNullValue() && rangeOnlyContains(V.begin(), V.end(), C))
+ return ConstantAggregateZero::get(Ty);
- // Add a null terminator to the string...
- if (AddNull)
- ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
+ // Check to see if all of the elements are ConstantFP or ConstantInt and if
+ // the element type is compatible with ConstantDataVector. If so, use it.
+ if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
+ // We speculatively build the elements here even if it turns out that there
+ // is a constantexpr or something else weird in the array, since it is so
+ // uncommon for that to happen.
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
+ if (CI->getType()->isIntegerTy(8)) {
+ SmallVector<uint8_t, 16> Elts;
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
+ Elts.push_back(CI->getZExtValue());
+ else
+ break;
+ if (Elts.size() == V.size())
+ return ConstantDataArray::get(C->getContext(), Elts);
+ } else if (CI->getType()->isIntegerTy(16)) {
+ SmallVector<uint16_t, 16> Elts;
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
+ Elts.push_back(CI->getZExtValue());
+ else
+ break;
+ if (Elts.size() == V.size())
+ return ConstantDataArray::get(C->getContext(), Elts);
+ } else if (CI->getType()->isIntegerTy(32)) {
+ SmallVector<uint32_t, 16> Elts;
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
+ Elts.push_back(CI->getZExtValue());
+ else
+ break;
+ if (Elts.size() == V.size())
+ return ConstantDataArray::get(C->getContext(), Elts);
+ } else if (CI->getType()->isIntegerTy(64)) {
+ SmallVector<uint64_t, 16> Elts;
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
+ Elts.push_back(CI->getZExtValue());
+ else
+ break;
+ if (Elts.size() == V.size())
+ return ConstantDataArray::get(C->getContext(), Elts);
+ }
+ }
+
+ if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
+ if (CFP->getType()->isFloatTy()) {
+ SmallVector<float, 16> Elts;
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
+ Elts.push_back(CFP->getValueAPF().convertToFloat());
+ else
+ break;
+ if (Elts.size() == V.size())
+ return ConstantDataArray::get(C->getContext(), Elts);
+ } else if (CFP->getType()->isDoubleTy()) {
+ SmallVector<double, 16> Elts;
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
+ Elts.push_back(CFP->getValueAPF().convertToDouble());
+ else
+ break;
+ if (Elts.size() == V.size())
+ return ConstantDataArray::get(C->getContext(), Elts);
+ }
+ }
+ }
- ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
- return get(ATy, ElementVals);
+ // Otherwise, we really do want to create a ConstantArray.
+ return pImpl->ArrayConstants.getOrCreate(Ty, V);
}
/// getTypeForElements - Return an anonymous struct type to use for a constant
StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
ArrayRef<Constant*> V,
bool Packed) {
- SmallVector<Type*, 16> EltTypes;
- for (unsigned i = 0, e = V.size(); i != e; ++i)
- EltTypes.push_back(V[i]->getType());
+ unsigned VecSize = V.size();
+ SmallVector<Type*, 16> EltTypes(VecSize);
+ for (unsigned i = 0; i != VecSize; ++i)
+ EltTypes[i] = V[i]->getType();
return StructType::get(Context, EltTypes, Packed);
}
// Check to see if all of the elements are ConstantFP or ConstantInt and if
// the element type is compatible with ConstantDataVector. If so, use it.
- if (ConstantDataSequential::isElementTypeCompatible(C->getType()) &&
- (isa<ConstantFP>(C) || isa<ConstantInt>(C))) {
+ if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
// We speculatively build the elements here even if it turns out that there
// is a constantexpr or something else weird in the array, since it is so
// uncommon for that to happen.
destroyConstantImpl();
}
-/// isString - This method returns true if the array is an array of i8, and
-/// if the elements of the array are all ConstantInt's.
-bool ConstantArray::isString() const {
- // Check the element type for i8...
- if (!getType()->getElementType()->isIntegerTy(8))
- return false;
- // Check the elements to make sure they are all integers, not constant
- // expressions.
- for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
- if (!isa<ConstantInt>(getOperand(i)))
- return false;
- return true;
-}
-
-/// isCString - This method returns true if the array is a string (see
-/// isString) and it ends in a null byte \\0 and does not contains any other
-/// null bytes except its terminator.
-bool ConstantArray::isCString() const {
- // Check the element type for i8...
- if (!getType()->getElementType()->isIntegerTy(8))
- return false;
-
- // Last element must be a null.
- if (!getOperand(getNumOperands()-1)->isNullValue())
- return false;
- // Other elements must be non-null integers.
- for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
- if (!isa<ConstantInt>(getOperand(i)))
- return false;
- if (getOperand(i)->isNullValue())
- return false;
- }
- return true;
-}
-
-
-/// convertToString - Helper function for getAsString() and getAsCString().
-static std::string convertToString(const User *U, unsigned len) {
- std::string Result;
- Result.reserve(len);
- for (unsigned i = 0; i != len; ++i)
- Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
- return Result;
-}
-
-/// getAsString - If this array is isString(), then this method converts the
-/// array to an std::string and returns it. Otherwise, it asserts out.
-///
-std::string ConstantArray::getAsString() const {
- assert(isString() && "Not a string!");
- return convertToString(this, getNumOperands());
-}
-
-
-/// getAsCString - If this array is isCString(), then this method converts the
-/// array (without the trailing null byte) to an std::string and returns it.
-/// Otherwise, it asserts out.
-///
-std::string ConstantArray::getAsCString() const {
- assert(isCString() && "Not a string!");
- return convertToString(this, getNumOperands() - 1);
-}
-
//---- ConstantStruct::get() implementation...
//
isExact ? PossiblyExactOperator::IsExact : 0);
}
+/// getBinOpIdentity - Return the identity for the given binary operation,
+/// i.e. a constant C such that X op C = X and C op X = X for every X. It
+/// returns null if the operator doesn't have an identity.
+Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
+ switch (Opcode) {
+ default:
+ // Doesn't have an identity.
+ return 0;
+
+ case Instruction::Add:
+ case Instruction::Or:
+ case Instruction::Xor:
+ return Constant::getNullValue(Ty);
+
+ case Instruction::Mul:
+ return ConstantInt::get(Ty, 1);
+
+ case Instruction::And:
+ return Constant::getAllOnesValue(Ty);
+ }
+}
+
+/// getBinOpAbsorber - Return the absorbing element for the given binary
+/// operation, i.e. a constant C such that X op C = C and C op X = C for
+/// every X. For example, this returns zero for integer multiplication.
+/// It returns null if the operator doesn't have an absorbing element.
+Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
+ switch (Opcode) {
+ default:
+ // Doesn't have an absorber.
+ return 0;
+
+ case Instruction::Or:
+ return Constant::getAllOnesValue(Ty);
+
+ case Instruction::And:
+ case Instruction::Mul:
+ return Constant::getNullValue(Ty);
+ }
+}
+
// destroyConstant - Remove the constant from the constant table...
//
void ConstantExpr::destroyConstant() {
// The data is stored in host byte order, make sure to cast back to the right
// type to load with the right endianness.
switch (getElementType()->getIntegerBitWidth()) {
- default: assert(0 && "Invalid bitwidth for CDS");
+ default: llvm_unreachable("Invalid bitwidth for CDS");
case 8: return *(uint8_t*)EltPtr;
case 16: return *(uint16_t*)EltPtr;
case 32: return *(uint32_t*)EltPtr;
switch (getElementType()->getTypeID()) {
default:
- assert(0 && "Accessor can only be used when element is float/double!");
+ llvm_unreachable("Accessor can only be used when element is float/double!");
case Type::FloatTyID: return APFloat(*(float*)EltPtr);
case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
}
LLVMContextImpl *pImpl = getType()->getContext().pImpl;
- std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
- Lookup.first.first = cast<ArrayType>(getType());
- Lookup.second = this;
-
- std::vector<Constant*> &Values = Lookup.first.second;
+ 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,
++NumUpdated;
}
Values.push_back(Val);
- AllSame = Val == ToC;
+ AllSame &= Val == ToC;
}
Constant *Replacement = 0;
Replacement = UndefValue::get(getType());
} else {
// Check to see if we have this array type already.
- bool Exists;
+ Lookup.second = makeArrayRef(Values);
LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
- pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
+ pImpl->ArrayConstants.find(Lookup);
- if (Exists) {
- Replacement = I->second;
+ 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.MoveConstantToNewSlot(this, I);
+ 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 (getOperand(i) == From)
setOperand(i, ToC);
}
+ pImpl->ArrayConstants.insert(this);
return;
}
}
unsigned OperandToUpdate = U-OperandList;
assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
- std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
- Lookup.first.first = cast<StructType>(getType());
- Lookup.second = this;
- std::vector<Constant*> &Values = Lookup.first.second;
+ 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,
// compute whether this turns into an all-zeros struct.
bool isAllZeros = false;
Replacement = UndefValue::get(getType());
} else {
// Check to see if we have this struct type already.
- bool Exists;
+ Lookup.second = makeArrayRef(Values);
LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
- pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
+ pImpl->StructConstants.find(Lookup);
- if (Exists) {
- Replacement = I->second;
+ 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.MoveConstantToNewSlot(this, I);
+ pImpl->StructConstants.remove(this);
// Update to the new value.
setOperand(OperandToUpdate, ToC);
+ pImpl->StructConstants.insert(this);
return;
}
}
projects / oota-llvm.git / blobdiff