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Revert evaluation cache

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And return on using TT as backing store for position
evaluations.

Tests (even on single thread) show eval cache was a regression.
In multi thread result should be even worst because eval cache
is a per-thread struct, while TT is shared.

After 4957 games at 15"+0.05 (single thread)
eval cache vs master 969 - 1093 - 2895  -9 ELO

So previous reported result of +18 ELO was probably due to an
issue in the testing framework (a bug in cutechess-cli) that
has been fixed in the meanwhile.

bench: 5386711
This commit is contained in:
Marco Costalba
2012-12-27 12:13:31 +01:00
parent f78b68b7ff
commit 3cf6471738
6 changed files with 61 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/tt.h
View File

@@ -44,7 +44,7 @@
class TTEntry {
public:
void save(uint32_t k, Value v, Bound b, Depth d, Move m, int g) {
void save(uint32_t k, Value v, Bound b, Depth d, Move m, int g, Value statV, Value statM) {
key32 = (uint32_t)k;
move16 = (uint16_t)m;
@@ -52,6 +52,8 @@ public:
generation8 = (uint8_t)g;
value16 = (int16_t)v;
depth16 = (int16_t)d;
staticValue = (int16_t)statV;
staticMargin = (int16_t)statM;
}
void set_generation(int g) { generation8 = (uint8_t)g; }
@@ -61,12 +63,14 @@ public:
Value value() const { return (Value)value16; }
Bound type() const { return (Bound)bound; }
int generation() const { return (int)generation8; }
Value static_value() const { return (Value)staticValue; }
Value static_value_margin() const { return (Value)staticMargin; }
private:
uint32_t key32;
uint16_t move16;
uint8_t bound, generation8;
int16_t value16, depth16;
int16_t value16, depth16, staticValue, staticMargin;
};
@@ -96,7 +100,7 @@ public:
~TranspositionTable();
void set_size(size_t mbSize);
void clear();
void store(const Key posKey, Value v, Bound type, Depth d, Move m);
void store(const Key posKey, Value v, Bound type, Depth d, Move m, Value statV, Value kingD);
TTEntry* probe(const Key posKey) const;
void new_search();
TTEntry* first_entry(const Key posKey) const;