/// index.
Constant *getElementValue(unsigned Idx) const;
+ /// \brief Return the number of elements in the array, vector, or struct.
+ unsigned getNumElements() const;
+
/// Methods for support type inquiry through isa, cast, and dyn_cast:
///
static bool classof(const Value *V) {
/// index.
UndefValue *getElementValue(unsigned Idx) const;
+ /// \brief Return the number of elements in the array, vector, or struct.
+ unsigned getNumElements() const;
+
void destroyConstant() override;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : nullptr;
- if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
- return CAZ->getElementValue(Elt);
+ if (const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(this))
+ return Elt < CAZ->getNumElements() ? CAZ->getElementValue(Elt) : nullptr;
if (const UndefValue *UV = dyn_cast<UndefValue>(this))
- return UV->getElementValue(Elt);
+ return Elt < UV->getNumElements() ? UV->getElementValue(Elt) : nullptr;
if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt)
return getStructElement(Idx);
}
+unsigned ConstantAggregateZero::getNumElements() const {
+ const Type *Ty = getType();
+ if (const auto *AT = dyn_cast<ArrayType>(Ty))
+ return AT->getNumElements();
+ if (const auto *VT = dyn_cast<VectorType>(Ty))
+ return VT->getNumElements();
+ return Ty->getStructNumElements();
+}
//===----------------------------------------------------------------------===//
// UndefValue Implementation
return getStructElement(Idx);
}
-
+unsigned UndefValue::getNumElements() const {
+ const Type *Ty = getType();
+ if (const auto *AT = dyn_cast<ArrayType>(Ty))
+ return AT->getNumElements();
+ if (const auto *VT = dyn_cast<VectorType>(Ty))
+ return VT->getNumElements();
+ return Ty->getStructNumElements();
+}
//===----------------------------------------------------------------------===//
// ConstantXXX Classes
--- /dev/null
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+@zeroinit = constant {} zeroinitializer
+@undef = constant {} undef
+
+define i32 @crash_on_zeroinit() {
+; CHECK-LABEL: @crash_on_zeroinit
+; CHECK: ret i32 0
+ %load = load i32* bitcast ({}* @zeroinit to i32*)
+ ret i32 %load
+}
+
+define i32 @crash_on_undef() {
+; CHECK-LABEL: @crash_on_undef
+; CHECK: ret i32 undef
+ %load = load i32* bitcast ({}* @undef to i32*)
+ ret i32 %load
+}
+