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Simplify Pawnidx[] init code

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But still not clear what we have here...
This commit is contained in:
Marco Costalba 2016-05-15 14:17:44 +02:00
parent e435f85b02
commit 7448fce808
1 changed files with 13 additions and 12 deletions
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25
src/syzygy/tbprobe.cpp
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@ -1584,26 +1584,27 @@ void Tablebases::init(const std::string& paths)
MapToEdges[s] = 48 - f - 2 * rank_of(s);
}
// Fill Binomial[] with the Binomial Coefficents using Pascal triangle
// Fill Binomial[] with the Binomial Coefficents using Pascal rule. There
// are Binomial[k][n] ways to choose k elements from a set of n elements.
Binomial[0][0] = 1;
for (int n = 1; n < 64; n++)
for (int k = 0; k < 6 && k <= n; ++k)
Binomial[k][n] = (k > 0 ? Binomial[k-1][n-1] : 0)
+ (k < n ? Binomial[k][n-1] : 0);
for (int n = 1; n < 64; n++) // Squares
for (int k = 0; k < 6 && k <= n; ++k) // Pieces
Binomial[k][n] = (k > 0 ? Binomial[k - 1][n - 1] : 0)
+ (k < n ? Binomial[k ][n - 1] : 0);
for (int i = 0; i < 5; ++i) {
int k = 0;
for (int k = 0; k < 5; ++k) {
int n = 0;
for (int j = 1; j <= 4; ++j) {
for (int f = 1; f <= 4; ++f) {
int s = 0;
for ( ; k < 6 * j; ++k) {
Pawnidx[i][k] = s;
s += Binomial[i][MapToEdges[8 * (k % 6) + k / 6 + 8]];
for ( ; n < 6 * f; ++n) {
Pawnidx[k][n] = s;
s += Binomial[k][47 - 2 * n];
}
Pfactor[i][j - 1] = s;
Pfactor[k][f - 1] = s;
}
}