Add convenience functions for creating inbounds GEPs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78695 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index 2670965..89578fb 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -1363,6 +1363,7 @@
Constant* ConstantExpr::getAlignOf(const Type* Ty) {
// alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
+ // Note that a non-inbounds gep is used, as null isn't within any object.
const Type *AligningTy = StructType::get(Ty->getContext(),
Type::Int8Ty, Ty, NULL);
Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
@@ -1438,11 +1439,30 @@
return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
}
+Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
+ Value* const *Idxs,
+ unsigned NumIdx) {
+ // Get the result type of the getelementptr!
+ const Type *Ty =
+ GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
+ assert(Ty && "GEP indices invalid!");
+ unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
+ Constant *Result = getGetElementPtrTy(PointerType::get(Ty, As), C,
+ Idxs, NumIdx);
+ cast<GEPOperator>(Result)->setIsInBounds(true);
+ return Result;
+}
+
Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
unsigned NumIdx) {
return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
}
+Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
+ Constant* const *Idxs,
+ unsigned NumIdx) {
+ return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
+}
Constant *
ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {