Stockfish 9

[stockfish] / src / misc.cpp

diff --git a/src/misc.cpp b/src/misc.cpp
index 7075dd3cdc8498192cd8f256740fcc497cb63827..2eb62f3e4ff7e4fbf6d01845337e10b5fe6284d9 100644 (file)
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -2,7 +2,7 @@
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -21,9 +21,19 @@
 #ifdef _WIN32
 #if _WIN32_WINNT < 0x0601
 #undef  _WIN32_WINNT
-#define _WIN32_WINNT 0x0601 // Force to include newest API (Win 7 or later)
+#define _WIN32_WINNT 0x0601 // Force to include needed API prototypes
 #endif
-#include <windows.h> // For processor groups
+#include <windows.h>
+// The needed Windows API for processor groups could be missed from old Windows
+// versions, so instead of calling them directly (forcing the linker to resolve
+// the calls at compile time), try to load them at runtime. To do this we need
+// first to define the corresponding function pointers.
+extern "C" {
+typedef bool(*fun1_t)(LOGICAL_PROCESSOR_RELATIONSHIP,
+                      PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX, PDWORD);
+typedef bool(*fun2_t)(USHORT, PGROUP_AFFINITY);
+typedef bool(*fun3_t)(HANDLE, CONST GROUP_AFFINITY*, PGROUP_AFFINITY);
+}
 #endif
 
 #include <fstream>
@@ -41,7 +51,7 @@ namespace {
 
 /// Version number. If Version is left empty, then compile date in the format
 /// DD-MM-YY and show in engine_info.
-const string Version = "";
+const string Version = "9";
 
 /// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
 /// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
@@ -53,10 +63,10 @@ struct Tie: public streambuf { // MSVC requires split streambuf for cin and cout
 
   Tie(streambuf* b, streambuf* l) : buf(b), logBuf(l) {}
 
-  int sync() { return logBuf->pubsync(), buf->pubsync(); }
-  int overflow(int c) { return log(buf->sputc((char)c), "<< "); }
-  int underflow() { return buf->sgetc(); }
-  int uflow() { return log(buf->sbumpc(), ">> "); }
+  int sync() override { return logBuf->pubsync(), buf->pubsync(); }
+  int overflow(int c) override { return log(buf->sputc((char)c), "<< "); }
+  int underflow() override { return buf->sgetc(); }
+  int uflow() override { return log(buf->sbumpc(), ">> "); }
 
   streambuf *buf, *logBuf;
 
@@ -195,6 +205,12 @@ void prefetch(void* addr) {
 
 #endif
 
+void prefetch2(void* addr) {
+
+  prefetch(addr);
+  prefetch((uint8_t*)addr + 64);
+}
+
 namespace WinProcGroup {
 
 #ifndef _WIN32
@@ -215,15 +231,14 @@ int get_group(size_t idx) {
   DWORD returnLength = 0;
   DWORD byteOffset = 0;
 
-  // Early exit if the needed API are not available at runtime
+  // Early exit if the needed API is not available at runtime
   HMODULE k32 = GetModuleHandle("Kernel32.dll");
-  if (   !GetProcAddress(k32, "GetLogicalProcessorInformationEx")
-      || !GetProcAddress(k32, "GetNumaNodeProcessorMaskEx")
-      || !GetProcAddress(k32, "SetThreadGroupAffinity"))
+  auto fun1 = (fun1_t)GetProcAddress(k32, "GetLogicalProcessorInformationEx");
+  if (!fun1)
       return -1;
 
   // First call to get returnLength. We expect it to fail due to null buffer
-  if (GetLogicalProcessorInformationEx(RelationAll, nullptr, &returnLength))
+  if (fun1(RelationAll, nullptr, &returnLength))
       return -1;
 
   // Once we know returnLength, allocate the buffer
@@ -231,7 +246,7 @@ int get_group(size_t idx) {
   ptr = buffer = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX*)malloc(returnLength);
 
   // Second call, now we expect to succeed
-  if (!GetLogicalProcessorInformationEx(RelationAll, buffer, &returnLength))
+  if (!fun1(RelationAll, buffer, &returnLength))
   {
       free(buffer);
       return -1;
@@ -278,15 +293,23 @@ int get_group(size_t idx) {
 
 void bindThisThread(size_t idx) {
 
-  // Use a local variable instead of a static: slower but thread-safe
+  // Use only local variables to be thread-safe
   int group = get_group(idx);
 
   if (group == -1)
       return;
 
-  GROUP_AFFINITY mask;
-  if (GetNumaNodeProcessorMaskEx(group, &mask))
-      SetThreadGroupAffinity(GetCurrentThread(), &mask, nullptr);
+  // Early exit if the needed API are not available at runtime
+  HMODULE k32 = GetModuleHandle("Kernel32.dll");
+  auto fun2 = (fun2_t)GetProcAddress(k32, "GetNumaNodeProcessorMaskEx");
+  auto fun3 = (fun3_t)GetProcAddress(k32, "SetThreadGroupAffinity");
+
+  if (!fun2 || !fun3)
+      return;
+
+  GROUP_AFFINITY affinity;
+  if (fun2(group, &affinity))
+      fun3(GetCurrentThread(), &affinity, nullptr);
 }
 
 #endif