+ /// \brief Filter out checks between pointers from the same partition.
+ ///
+ /// \p PtrToPartition contains the partition number for pointers. Partition
+ /// number -1 means that the pointer is used in multiple partitions. In this
+ /// case we can't safely omit the check.
+ SmallVector<RuntimePointerChecking::PointerCheck, 4>
+ includeOnlyCrossPartitionChecks(
+ const SmallVectorImpl<RuntimePointerChecking::PointerCheck> &AllChecks,
+ const SmallVectorImpl<int> &PtrToPartition,
+ const RuntimePointerChecking *RtPtrChecking) {
+ SmallVector<RuntimePointerChecking::PointerCheck, 4> Checks;
+
+ std::copy_if(AllChecks.begin(), AllChecks.end(), std::back_inserter(Checks),
+ [&](const RuntimePointerChecking::PointerCheck &Check) {
+ for (unsigned PtrIdx1 : Check.first->Members)
+ for (unsigned PtrIdx2 : Check.second->Members)
+ // Only include this check if there is a pair of pointers
+ // that require checking and the pointers fall into
+ // separate partitions.
+ //
+ // (Note that we already know at this point that the two
+ // pointer groups need checking but it doesn't follow
+ // that each pair of pointers within the two groups need
+ // checking as well.
+ //
+ // In other words we don't want to include a check just
+ // because there is a pair of pointers between the two
+ // pointer groups that require checks and a different
+ // pair whose pointers fall into different partitions.)
+ if (RtPtrChecking->needsChecking(PtrIdx1, PtrIdx2) &&
+ !RuntimePointerChecking::arePointersInSamePartition(
+ PtrToPartition, PtrIdx1, PtrIdx2))
+ return true;
+ return false;
+ });
+
+ return Checks;
+ }
+