always_inline a few methods

src/array_view.hh

@@ -44,6 +44,8 @@ public:
 
     constexpr T* pointer() const { return m_pointer; }
     constexpr size_t size() const { return m_size; }
+
+    [[gnu::always_inline]]
     constexpr T& operator[](size_t n) const { return *(m_pointer + n); }
 
     constexpr T* begin() const { return m_pointer; }

src/diff.hh

@@ -18,7 +18,9 @@ struct MirroredArray : public ArrayView<T>
             (*this)[i] = 0;
     }
 
+    [[gnu::always_inline]]
     T& operator[](int n) { return ArrayView<T>::operator[](n + size); }
+    [[gnu::always_inline]]
     const T& operator[](int n) const { return ArrayView<T>::operator[](n + size); }
 private:
     int size;