+#endif
+
+#if 1
+#define dotproduct(a, b) ((a) * (b))
+#else
+noref vector _dotproduct_a, _dotproduct_b;
+#define dotproduct(a, b) \
+ (_dotproduct_a = (a), _dotproduct_b = (b), \
+ _dotproduct_a.x * _dotproduct_b.x \
+ + _dotproduct_a.y * _dotproduct_b.y \
+ + _dotproduct_a.z * _dotproduct_b.z)
+#endif