+ /// \brief Create an invariant.group.barrier intrinsic call, that stops
+ /// optimizer to propagate equality using invariant.group metadata.
+ /// If Ptr type is different from i8*, it's casted to i8* before call
+ /// and casted back to Ptr type after call.
+ Value *CreateInvariantGroupBarrier(Value *Ptr) {
+ Module *M = BB->getParent()->getParent();
+ Function *FnInvariantGroupBarrier = Intrinsic::getDeclaration(M,
+ Intrinsic::invariant_group_barrier);
+
+ Type *ArgumentAndReturnType = FnInvariantGroupBarrier->getReturnType();
+ assert(ArgumentAndReturnType ==
+ FnInvariantGroupBarrier->getFunctionType()->getParamType(0) &&
+ "InvariantGroupBarrier should take and return the same type");
+ Type *PtrType = Ptr->getType();
+
+ bool PtrTypeConversionNeeded = PtrType != ArgumentAndReturnType;
+ if (PtrTypeConversionNeeded)
+ Ptr = CreateBitCast(Ptr, ArgumentAndReturnType);
+
+ CallInst *Fn = CreateCall(FnInvariantGroupBarrier, {Ptr});
+
+ if (PtrTypeConversionNeeded)
+ return CreateBitCast(Fn, PtrType);
+ return Fn;
+ }
+