TranspositionTable TT; // Our global transposition table
-/// TTEntry::save saves a TTEntry
-void TTEntry::save(Key k, Value v, bool PvNode, Bound b, Depth d, Move m, Value ev) {
+/// TTEntry::save populates the TTEntry with a new node's data, possibly
+/// overwriting an old position. Update is not atomic and can be racy.
+
+void TTEntry::save(Key k, Value v, bool pv, Bound b, Depth d, Move m, Value ev) {
assert(d / ONE_PLY * ONE_PLY == d);
// Overwrite less valuable entries
if ( (k >> 48) != key16
- || d / ONE_PLY > depth8 - 4
+ ||(d - DEPTH_OFFSET) / ONE_PLY > depth8 - 4
|| b == BOUND_EXACT)
{
+ assert((d - DEPTH_OFFSET) / ONE_PLY >= 0);
+
key16 = (uint16_t)(k >> 48);
value16 = (int16_t)v;
eval16 = (int16_t)ev;
- genBound8 = (uint8_t)(TT.generation8 | PvNode << 2 | b);
- depth8 = (int8_t)(d / ONE_PLY);
+ genBound8 = (uint8_t)(TT.generation8 | uint8_t(pv) << 2 | b);
+ depth8 = (uint8_t)((d - DEPTH_OFFSET) / ONE_PLY);
}
}
for (int i = 0; i < ClusterSize; ++i)
if (!tte[i].key16 || tte[i].key16 == key16)
{
- tte[i].genBound8 = uint8_t(generation8 | tte[i].pv_hit() << 2 | tte[i].bound()); // Refresh
+ tte[i].genBound8 = uint8_t(generation8 | (tte[i].genBound8 & 0x7)); // Refresh
return found = (bool)tte[i].key16, &tte[i];
}
TTEntry* replace = tte;
for (int i = 1; i < ClusterSize; ++i)
// Due to our packed storage format for generation and its cyclic
- // nature we add 263 (263 is the modulus plus 7 to keep the lowest
- // two bound bits from affecting the result) to calculate the entry
+ // nature we add 263 (256 is the modulus plus 7 to keep the unrelated
+ // lowest three bits from affecting the result) to calculate the entry
// age correctly even after generation8 overflows into the next cycle.
if ( replace->depth8 - ((263 + generation8 - replace->genBound8) & 0xF8)
> tte[i].depth8 - ((263 + generation8 - tte[i].genBound8) & 0xF8))
int cnt = 0;
for (int i = 0; i < 1000 / ClusterSize; ++i)
for (int j = 0; j < ClusterSize; ++j)
- cnt += (table[i].entry[j].genBound8 & 0xFC) == generation8;
+ cnt += (table[i].entry[j].genBound8 & 0xF8) == generation8;
return cnt * 1000 / (ClusterSize * (1000 / ClusterSize));
}