diff --git a/src/common/intrusive_list.h b/src/common/intrusive_list.h
index 021eea05..c7b402e7 100644
--- a/src/common/intrusive_list.h
+++ b/src/common/intrusive_list.h
@@ -216,6 +216,14 @@ public:
         return root->next == root.get();
     }
 
+    /**
+     * Gets the total number of elements within this list.
+     * @return the number of elements in this list.
+     */
+    size_type size() const {
+        return static_cast<size_type>(std::distance(begin(), end()));
+    }
+
     /**
      * Retrieves a reference to the node at the front of the list.
      * @note Must not be called on an empty list.
diff --git a/src/frontend/ir/basic_block.h b/src/frontend/ir/basic_block.h
index 2fd6d385..006a2319 100644
--- a/src/frontend/ir/basic_block.h
+++ b/src/frontend/ir/basic_block.h
@@ -30,6 +30,7 @@ namespace IR {
 class Block final {
 public:
     using InstructionList        = Common::IntrusiveList<Inst>;
+    using size_type              = InstructionList::size_type;
     using iterator               = InstructionList::iterator;
     using const_iterator         = InstructionList::const_iterator;
     using reverse_iterator       = InstructionList::reverse_iterator;
@@ -38,6 +39,7 @@ public:
     explicit Block(const Arm::LocationDescriptor& location) : location(location) {}
 
     bool                   empty()   const { return instructions.empty();   }
+    size_type              size()    const { return instructions.size();    }
 
     Inst&                  front()         { return instructions.front();   }
     const Inst&            front()   const { return instructions.front();   }