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Rearrange interpolation formula

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Put the division at the end to reduce
rounding errors. This alters the bench
due to different rounding errors, but
should not alter ELO in any way.

bench: 7615217
This commit is contained in:
Marco Costalba
2014-04-28 17:15:16 +02:00
parent 918c29f83a
commit db229504e2
1 changed files with 2 additions and 2 deletions
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4
src/evaluate.cpp
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@@ -779,9 +779,9 @@ namespace {
sf = ScaleFactor(50 * sf / SCALE_FACTOR_NORMAL);
}
// Interpolate between a middlegame and an endgame score, scaling by 'sf'
// Interpolate between a middlegame and a (scaled by 'sf') endgame score
Value v = mg_value(score) * int(ei.mi->game_phase())
+ eg_value(score) * int(sf) / SCALE_FACTOR_NORMAL * int(PHASE_MIDGAME - ei.mi->game_phase());
+ eg_value(score) * int(PHASE_MIDGAME - ei.mi->game_phase()) * sf / SCALE_FACTOR_NORMAL;
v /= PHASE_MIDGAME;