From: jundery <jundery@gmail.com>
Date: Mon, 11 Mar 2013 14:18:15 +0000 (-0600)
Subject: Do more work between prefetch and querying transposition table
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=ccf4ec6768b17f47b48a296978bc19e3eaaa70ba

Do more work between prefetch and querying transposition table

More time to load the cache line before access

No functional change.
---

diff --git a/src/search.cpp b/src/search.cpp
index cff8e768..7970a393 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1128,6 +1128,12 @@ split_point_start: // At split points actual search starts from here
     if (pos.is_draw<true>() || ss->ply > MAX_PLY)
         return DrawValue[pos.side_to_move()];
 
+    // Decide whether or not to include checks, this fixes also the type of
+    // TT entry depth that we are going to use. Note that in qsearch we use
+    // only two types of depth in TT: DEPTH_QS_CHECKS or DEPTH_QS_NO_CHECKS.
+    ttDepth = InCheck || depth >= DEPTH_QS_CHECKS ? DEPTH_QS_CHECKS
+                                                  : DEPTH_QS_NO_CHECKS;
+
     // Transposition table lookup. At PV nodes, we don't use the TT for
     // pruning, but only for move ordering.
     posKey = pos.key();
@@ -1135,11 +1141,6 @@ split_point_start: // At split points actual search starts from here
     ttMove = tte ? tte->move() : MOVE_NONE;
     ttValue = tte ? value_from_tt(tte->value(),ss->ply) : VALUE_NONE;
 
-    // Decide whether or not to include checks, this fixes also the type of
-    // TT entry depth that we are going to use. Note that in qsearch we use
-    // only two types of depth in TT: DEPTH_QS_CHECKS or DEPTH_QS_NO_CHECKS.
-    ttDepth = InCheck || depth >= DEPTH_QS_CHECKS ? DEPTH_QS_CHECKS
-                                                  : DEPTH_QS_NO_CHECKS;
     if (   tte
         && tte->depth() >= ttDepth
         && ttValue != VALUE_NONE // Only in case of TT access race