From 59cfb4c570b0e11470900264b151295e64226947 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 1 Nov 2023 16:25:50 -0600
Subject: [PATCH] [instancing] Micro-optimize a loop

---
 src/hb-ot-var-common.hh | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/src/hb-ot-var-common.hh b/src/hb-ot-var-common.hh
index b62458c9f..ee5877ea1 100644
--- a/src/hb-ot-var-common.hh
+++ b/src/hb-ot-var-common.hh
@@ -516,14 +516,19 @@ struct tuple_delta_t
       return *this;
 
     unsigned num = indices.length;
-    for (unsigned i = 0; i < num; i++)
-    {
-      if (!indices.arrayZ[i]) continue;
-
-      deltas_x[i] *= scalar;
-      if (deltas_y)
-        deltas_y[i] *= scalar;
-    }
+    if (deltas_y)
+      for (unsigned i = 0; i < num; i++)
+      {
+	if (!indices.arrayZ[i]) continue;
+	deltas_x[i] *= scalar;
+	deltas_y[i] *= scalar;
+      }
+    else
+      for (unsigned i = 0; i < num; i++)
+      {
+	if (!indices.arrayZ[i]) continue;
+	deltas_x[i] *= scalar;
+      }
     return *this;
   }