Ensure move_importance() is non-zero

In case ply is very high, function will round
to zero (although mathematically it is always
bigger than zero). On my system this happens at
movenumber 6661.

Although 6661 moves in a game is, of course,
probably impossible, for safety and to be locally
consistent makes sense to ensure returned value
is positive.

Non functional change.

diff --git a/src/timeman.cpp b/src/timeman.cpp
index 9accfbb346a6e2ca77b960378a29a496c3ceeb4f..0348b677f4597ef5aaf3075b604e8f50e16a1e71 100644 (file)
--- a/src/timeman.cpp
+++ b/src/timeman.cpp
@@ -18,6 +18,7 @@
 */
 
 #include <algorithm>
 */
 
 #include <algorithm>

+#include <cfloat>

 #include <cmath>
 
 #include "search.h"
 #include <cmath>
 
 #include "search.h"


@@ -44,7 +45,7 @@ namespace {
 
   double move_importance(int ply) {
 
 
   double move_importance(int ply) {
 

-    return pow((1 + exp((ply - xshift) / xscale)), -skewfactor);
+    return pow((1 + exp((ply - xshift) / xscale)), -skewfactor) + DBL_MIN; // Ensure non-zero

   }
 
 
   }