From: lucasart <lucas.braesch@gmail.com>
Date: Wed, 9 Aug 2017 11:35:05 +0000 (+0800)
Subject: Use int16_t in History values
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=ae6a4ebf1f44cb05e96f8f33342ec281b41b0cc0;hp=ae6a4ebf1f44cb05e96f8f33342ec281b41b0cc0

Use int16_t in History values

Reduces memory footprint by ~1.2MB (per thread).

Strong pressure: small but mesurable gain
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 258430 W: 46977 L: 45943 D: 165510

Low pressure: no regression
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 73542 W: 13058 L: 13026 D: 47458

Strong pressure + LTC: elo gain confirmed
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 31489 W: 4532 L: 4295 D: 22662

Tested for crashing on overflow and after 70K
games at STC we have only 4 time losses,
possible candidate for an overflow.

No functional change.
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