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Simplify saving a TT entry.

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Avoid passing TT.generation() to TTEntry::save() at every call,
moving the implementation of TTEntry::save from tt.h to tt.cpp.

tested for no regression:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 53787 W: 11948 L: 11890 D: 29949
http://tests.stockfishchess.org/tests/view/5b2ff37f0ebc5902b2e582fe

Closes https://github.com/official-stockfish/Stockfish/pull/1662

No functional change.
This commit is contained in:
Joost VandeVondele
2018-07-04 00:58:16 +02:00
committed by Stéphane Nicolet
parent 8c4f0ffa1d
commit e7cfa5d020
3 changed files with 31 additions and 29 deletions
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26
src/tt.h
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@@ -41,28 +41,7 @@ struct TTEntry {
Value eval() const { return (Value)eval16; }
Depth depth() const { return (Depth)(depth8 * int(ONE_PLY)); }
Bound bound() const { return (Bound)(genBound8 & 0x3); }
void save(Key k, Value v, Bound b, Depth d, Move m, Value ev, uint8_t g) {
assert(d / ONE_PLY * ONE_PLY == d);
// Preserve any existing move for the same position
if (m || (k >> 48) != key16)
move16 = (uint16_t)m;
// Don't overwrite more valuable entries
if ( (k >> 48) != key16
|| d / ONE_PLY > depth8 - 4
/* || g != (genBound8 & 0xFC) // Matching non-zero keys are already refreshed by probe() */
|| b == BOUND_EXACT)
{
key16 = (uint16_t)(k >> 48);
value16 = (int16_t)v;
eval16 = (int16_t)ev;
genBound8 = (uint8_t)(g | b);
depth8 = (int8_t)(d / ONE_PLY);
}
}
void save(Key k, Value v, Bound b, Depth d, Move m, Value ev);
private:
friend class TranspositionTable;
@@ -98,7 +77,6 @@ class TranspositionTable {
public:
~TranspositionTable() { free(mem); }
void new_search() { generation8 += 4; } // Lower 2 bits are used by Bound
uint8_t generation() const { return generation8; }
TTEntry* probe(const Key key, bool& found) const;
int hashfull() const;
void resize(size_t mbSize);
@@ -110,6 +88,8 @@ public:
}
private:
friend struct TTEntry;
size_t clusterCount;
Cluster* table;
void* mem;