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Ensure move_importance() is non-zero

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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.
This commit is contained in:
H. Felix Wittmann 2014-01-02 13:00:48 +01:00 • committed by Marco Costalba
parent 153309e287
commit 8454d871ec
1 changed files with 2 additions and 1 deletions
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3
src/timeman.cpp
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@ -18,6 +18,7 @@
*/
#include <algorithm>
#include <cfloat>
#include <cmath>
#include "search.h"
@ -44,7 +45,7 @@ namespace {
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
}