From: mstembera <MissingEmail@email>
Date: Wed, 15 Mar 2017 03:56:26 +0000 (-0700)
Subject: Fix pawn entry prefetch
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=d01b66ae8f4090c8e12e72423ff9165e6bc3a2f8

Fix pawn entry prefetch

No functional change

Closes #1026
---

diff --git a/src/misc.cpp b/src/misc.cpp
index 360bd216..11833440 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -205,6 +205,12 @@ void prefetch(void* addr) {
 
 #endif
 
+void prefetch2(void* addr) {
+
+    prefetch(addr);
+    prefetch((uint8_t*)addr + 64);
+}
+
 namespace WinProcGroup {
 
 #ifndef _WIN32
diff --git a/src/misc.h b/src/misc.h
index 72be1ee4..b63e613f 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -31,6 +31,7 @@
 
 const std::string engine_info(bool to_uci = false);
 void prefetch(void* addr);
+void prefetch2(void* addr);
 void start_logger(const std::string& fname);
 
 void dbg_hit_on(bool b);
diff --git a/src/position.cpp b/src/position.cpp
index 40890acf..e20c822f 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -827,7 +827,7 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
 
       // Update pawn hash key and prefetch access to pawnsTable
       st->pawnKey ^= Zobrist::psq[pc][from] ^ Zobrist::psq[pc][to];
-      prefetch(thisThread->pawnsTable[st->pawnKey]);
+      prefetch2(thisThread->pawnsTable[st->pawnKey]);
 
       // Reset rule 50 draw counter
       st->rule50 = 0;