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Unify stats update() 

Now that is a bit bigger makes sense to
unify some duplicated code.

No functional change.
pull/1201/head
Marco Costalba 2017-08-17 01:47:32 -07:00
parent ae6a4ebf1f
commit 9001f55147
1 changed files with 16 additions and 26 deletions
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42
src/movepick.h
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@ -35,6 +35,20 @@ struct StatBoards : public std::array<std::array<T, Size2>, Size1> {
T* p = &(*this)[0][0];
std::fill(p, p + sizeof(*this) / sizeof(*p), v);
}
void update(T& entry, int bonus, const int D) {
assert([&]{
int v = entry + bonus * 32 - entry * abs(bonus) / D;
return INT16_MIN < v && v < INT16_MAX;
}());
assert(abs(bonus) <= D); // Consistency check for below formula
entry += bonus * 32 - entry * abs(bonus) / D;
assert(abs(entry) <= 32 * D);
}
};
/// ButterflyBoards are 2 tables (one for each color) indexed by the move's from
@ -50,19 +64,7 @@ typedef StatBoards<PIECE_NB, SQUARE_NB> PieceToBoards;
struct ButterflyHistory : public ButterflyBoards {
void update(Color c, Move m, int bonus) {
const int D = 324;
auto& entry = (*this)[c][from_to(m)];
assert(abs(bonus) <= D); // Consistency check for below formula
assert([&]{
int v = entry + bonus * 32 - entry * abs(bonus) / D;
return INT16_MIN < v && v < INT16_MAX;
}());
entry += bonus * 32 - entry * abs(bonus) / D;
assert(abs(entry) <= 32 * D);
StatBoards::update((*this)[c][from_to(m)], bonus, 324);
}
};
@ -70,19 +72,7 @@ struct ButterflyHistory : public ButterflyBoards {
struct PieceToHistory : public PieceToBoards {
void update(Piece pc, Square to, int bonus) {
const int D = 936;
auto& entry = (*this)[pc][to];
assert(abs(bonus) <= D); // Consistency check for below formula
assert([&]{
int v = entry + bonus * 32 - entry * abs(bonus) / D;
return INT16_MIN < v && v < INT16_MAX;
}());
entry += bonus * 32 - entry * abs(bonus) / D;
assert(abs(entry) <= 32 * D);
StatBoards::update((*this)[pc][to], bonus, 936);
}
};