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Simplify futility margins formula

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New formula mathces the old formula until d = 45

Test code:

int main() {

  for(int d=1; d<=45; d++)
  {
     int a = int(log(double(d * d) / 2) / log(2.0) + 1.001);
     int b = int(2.9 * log(double(d)));

     if (a != b) std::cout << d << std::endl;
  }

  return 0;
}

bench: 8455956
This commit is contained in:
Chris Caino
2013-10-22 23:05:15 +02:00
committed by Marco Costalba
parent 2c825294ec
commit fbfce2132a
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -150,7 +150,7 @@ void Search::init() {
// Init futility margins array
for (d = 1; d < 16; ++d) for (mc = 0; mc < 64; ++mc)
FutilityMargins[d][mc] = Value(112 * int(log(double(d * d) / 2) / log(2.0) + 1.001) - 8 * mc + 45);
FutilityMargins[d][mc] = Value(112 * int(2.9 * log(double(d))) - 8 * mc + 45);
// Init futility move count array
for (d = 0; d < 32; ++d)