+ // Return true if Load and Store are loads and stores of the same size
+ // and are guaranteed not to overlap. Such operations can be implemented
+ // using block (SS-format) instructions.
+ //
+ // Partial overlap would lead to incorrect code, since the block operations
+ // are logically bytewise, even though they have a fast path for the
+ // non-overlapping case. We also need to avoid full overlap (i.e. two
+ // addresses that might be equal at run time) because although that case
+ // would be handled correctly, it might be implemented by millicode.
+ bool canUseBlockOperation(StoreSDNode *Store, LoadSDNode *Load) const;
+