Prefetch TT entries in probcut

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index ef98d862e6af7e9003bd4474af2a8c133641ade1..6e719be82f4a719a7c9810c5ea3907967c8cf2f8 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -364,14 +364,13 @@ void Thread::search() {
 
             // Reset aspiration window starting size
             Value avg = rootMoves[pvIdx].averageScore;
-            delta     = Value(10) + int(avg) * avg / 17470;
+            delta     = Value(10) + int(avg) * avg / 15335;
             alpha     = std::max(avg - delta, -VALUE_INFINITE);
             beta      = std::min(avg + delta, VALUE_INFINITE);
 
             // Adjust optimism based on root move's averageScore (~4 Elo)
-            int opt       = 113 * avg / (std::abs(avg) + 109);
-            optimism[us]  = Value(opt);
-            optimism[~us] = -optimism[us];
+            optimism[us]  = 103 * (avg + 33) / (std::abs(avg + 34) + 119);
+            optimism[~us] = -116 * (avg + 40) / (std::abs(avg + 12) + 123);
 
             // Start with a small aspiration window and, in the case of a fail
             // high/low, re-search with a bigger window until we don't fail
@@ -870,6 +869,9 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
             {
                 assert(pos.capture_stage(move));
 
+                // Prefetch the TT entry for the resulting position
+                prefetch(TT.first_entry(pos.key_after(move)));
+
                 ss->currentMove = move;
                 ss->continuationHistory =
                   &thisThread