Let prefetch to be enabled by default on Windows

[stockfish] / src / types.h

diff --git a/src/types.h b/src/types.h
index 27e2f1dd243e5948265de6b7d925465514fcce47..1f1eb0671160b17b4739ac047f8648050548d54e 100644 (file)
--- a/src/types.h
+++ b/src/types.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2009 Marco Costalba
+  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, 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
@@ -49,22 +49,29 @@ typedef uint64_t Bitboard;
 
 
 ////
-//// Compiler specific defines
+//// Configuration
 ////
 
-// Quiet a warning on Intel compiler
-#if !defined(__SIZEOF_INT__ )
-#define __SIZEOF_INT__ 0
-#endif
-
-// Check for 64 bits for different compilers: Intel, MSVC and gcc
-#if defined(__x86_64) || defined(_M_X64) || defined(_WIN64) || (__SIZEOF_INT__ > 4)
-#define IS_64BIT
-#endif
+//// For Linux configuration is done using Makefile. To get started type "make help".
+////
+//// For windows you need to set the right compiler switches manually:
+////
+//// -DNDEBUG       | Disable debugging mode. Use always.
+////
+//// -DIS_64BIT     | Compile in 64-bit mode. Use on 64-bit systems.
+////
+//// -DBIGENDIAN    | Should not be used on Windows
+////
+//// -DUSE_PREFETCH | Use prefetch asm-instruction. Gives a small speed up,
+////                | but executable won't work on some very old machines.
+////
+//// -DUSE_BSFQ     | Use bsfq asm-instruction. Works only in 64-bit mode.
+////                | Works with ICC and GCC, not with MSVC. Gives a small speed up.
+////
+//// -DUSE_POPCNT   | Add runtime support for use of popcnt asm-instruction.
+////                | Works only in 64-bit mode. For compiling requires hardware
+////                | with popcnt support. Around 4% speed-up.
 
-#if defined(IS_64BIT) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
-#define USE_BSFQ
-#endif
 
 // Cache line alignment specification
 #if defined(_MSC_VER) || defined(__INTEL_COMPILER)
@@ -77,7 +84,7 @@ typedef uint64_t Bitboard;
 // is already available as an intrinsic.
 #if defined(_MSC_VER)
 #include <intrin.h>
-#elif defined(__GNUC__)
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
 inline void __cpuid(int CPUInfo[4], int InfoType)
 {
   int* eax = CPUInfo + 0;
@@ -90,6 +97,11 @@ inline void __cpuid(int CPUInfo[4], int InfoType)
   __asm__("cpuid" : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
                   : "0" (*eax), "2" (*ecx));
 }
+#else
+inline void __cpuid(int CPUInfo[4], int)
+{
+   CPUInfo[0] = CPUInfo[1] = CPUInfo[2] = CPUInfo[3] = 0;
+}
 #endif
 
 #endif // !defined(TYPES_H_INCLUDED)