From: Marco Costalba <mcostalba@gmail.com>
Date: Wed, 30 Sep 2009 12:38:40 +0000 (+0200)
Subject: Optimize futilityValue calculation
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=a6c60378136b865f4a07a4ced22fc0484ababd2c;hp=e677185567173a0b50f0ca47bd2496c5f814dab4;ds=sidebyside

Optimize futilityValue calculation

Avoid calling evaluate() if we already have the score in TT

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index 58b60c87..b513871a 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1333,6 +1333,10 @@ namespace {
     bool useFutilityPruning =   depth < SelectiveDepth
                              && !isCheck;
 
+    // Avoid calling evaluate() if we already have the score in TT
+    if (tte && (tte->type() & VALUE_TYPE_EVAL))
+        futilityValue = value_from_tt(tte->value(), ply) + FutilityMargins[int(depth) - 2];
+
     // Loop through all legal moves until no moves remain or a beta cutoff
     // occurs.
     while (   bestValue < beta