From 11b8d56434cb55d8b4f99c9b6c70388a15fcfa6f Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Wed, 21 Dec 2011 15:31:47 +1100
Subject: [PATCH] added comment in polygon code

---
 libraries/AP_Math/polygon.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libraries/AP_Math/polygon.cpp b/libraries/AP_Math/polygon.cpp
index 0312a73fe8..05374b5b00 100644
--- a/libraries/AP_Math/polygon.cpp
+++ b/libraries/AP_Math/polygon.cpp
@@ -56,6 +56,7 @@ bool Polygon_outside(const Vector2l &P, const Vector2l *V, unsigned n)
         dy2s = sign(dy2);
         m1 = dx1s * dy2s;
         m2 = dx2s * dy1s;
+        // we avoid the 64 bit multiplies if we can based on sign checks.
         if (dy2 < 0) {
             if (m1 > m2) {
                 outside = !outside;