From a3eee419a139e9ea09a1809ebb01aaea92a243f1 Mon Sep 17 00:00:00 2001
From: Yaser Afshar <ya.afshar@gmail.com>
Date: Fri, 6 Mar 2020 09:01:28 -0600
Subject: [PATCH] minor optimization, avoiding double computation and extra
 communication

---
 src/min_cg.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/min_cg.cpp b/src/min_cg.cpp
index 9db1fd9799..c164fb55d6 100644
--- a/src/min_cg.cpp
+++ b/src/min_cg.cpp
@@ -109,11 +109,10 @@ int MinCG::iterate(int maxiter)
         dotall[1] += fextra[i]*gextra[i];
       }
 
-    fdotf = 0.0;
     if (update->ftol > 0.0) {
       if (normstyle == MAX) fdotf = fnorm_max();        // max force norm
       else if (normstyle == INF) fdotf = fnorm_inf();   // infinite force norm
-      else if (normstyle == TWO) fdotf = fnorm_sqr();   // Euclidean force 2-norm
+      else if (normstyle == TWO) fdotf = dotall[0];     // Euclidean force 2-norm
       else error->all(FLERR,"Illegal min_modify command");
       if (fdotf < update->ftol*update->ftol) return FTOL;
     }