From: Gregory Shklover <gregory.shklover@gmail.com>
Date: Thu, 22 Sep 2022 07:27:48 +0000 (+0000)
Subject: Small performance improvement to simplex
X-Git-Tag: 7.0.3~9^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b039dd10828c3c7947a42036772f7d1a51fec9cd;p=graphviz

Small performance improvement to simplex
---

diff --git a/lib/common/ns.c b/lib/common/ns.c
index 89613d5f3..42fdff6fb 100644
--- a/lib/common/ns.c
+++ b/lib/common/ns.c
@@ -471,11 +471,13 @@ subtree_t *merge_trees(Agedge_t *e)   /* entering tree edge */
 
   if (t0->heap_index == -1) {   // move t0
     delta = SLACK(e);
-    tree_adjust(t0->rep,NULL,delta);
+    if (delta != 0)
+      tree_adjust(t0->rep,NULL,delta);
   }
   else {  // move t1
     delta = -SLACK(e);
-    tree_adjust(t1->rep,NULL,delta);
+    if (delta != 0)
+      tree_adjust(t1->rep,NULL,delta);
   }
   if (add_tree_edge(e) != 0) {
     return NULL;