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Speculative prefetch

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Idea by Peter Oesterlund.
Implemented and tested by Joerg Oester

STC 3 threads
ELO: 3.19 +-2.1 (95%) LOS: 99.9%
Total: 40000 W: 7576 L: 7209 D: 25215

LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 22026 W: 3829 L: 3619 D: 14578

STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 7291 W: 1531 L: 1404 D: 4356

No functional change

Resolves #61
This commit is contained in:
joergoster
2014-10-02 22:19:14 +01:00
committed by Joona Kiiski
parent e60cdca9b0
commit 82d065b011
3 changed files with 22 additions and 0 deletions
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6
src/search.cpp
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@@ -788,6 +788,9 @@ moves_loop: // When in check and at SpNode search starts from here
}
}
// Speculative prefetch
prefetch((char*)TT.first_entry(pos.hash_after_move(move)));
// Check for legality just before making the move
if (!RootNode && !SpNode && !pos.legal(move, ci.pinned))
{
@@ -1137,6 +1140,9 @@ moves_loop: // When in check and at SpNode search starts from here
&& pos.see_sign(move) < VALUE_ZERO)
continue;
// Speculative prefetch
prefetch((char*)TT.first_entry(pos.hash_after_move(move)));
// Check for legality just before making the move
if (!pos.legal(move, ci.pinned))
continue;