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Ressurrect hashfull patch

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This is an old patch from Jean-Francois Romang to send
UCI hashfull info to the GUI:
https://github.com/mcostalba/Stockfish/pull/60/files

It was wrongly judged as a slowdown, but it takes much
less than 1 ms to run, indeed on my core i5 2.6Ghz it
takes about 2 microsecs to run!

Regression test is good:

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7352 W: 1548 L: 1401 D: 4403

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 61432 W: 10307 L: 10251 D: 40874

I have set the name of the author to the original
one.

No functional change.
This commit is contained in:
Jean-Francois Romang
2015-01-25 08:57:51 +01:00
committed by Marco Costalba
parent ce0a95c2c0
commit a3b4e9e23c
3 changed files with 24 additions and 2 deletions
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17
src/tt.cpp
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@@ -96,3 +96,20 @@ TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
return found = false, replace;
}
/// Returns an approximation of the hashtable occupation during a search. The
/// hash is x permill full, as per UCI protocol.
int TranspositionTable::hashfull() const
{
int cnt = 0;
for (int i = 0; i < 1000 / ClusterSize; i++)
{
const TTEntry* tte = &table[i].entry[0];
for (int j = 0; j < ClusterSize; j++)
if ((tte[j].genBound8 & 0xFC) == generation8)
cnt++;
}
return cnt;
}