X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftypes.h;h=0c12d930490bb6c4516c817fe2950d67f4c45ec7;hp=715874c7d86e88ed56b0cc0bf329c2f123e5ec5c;hb=40ad5194aa08aa8baaa9c6b8625b17fea73a8074;hpb=41816b7ced99c0bd096607fd8a35dbc0b427d455

diff --git a/src/types.h b/src/types.h
index 715874c7..0c12d930 100644
--- a/src/types.h
+++ b/src/types.h
@@ -49,20 +49,32 @@ typedef uint64_t Bitboard;
 
 
 ////
-//// Compiler specific defines
+//// Configuration
 ////
 
-// Quiet a warning on Intel compiler
-#if !defined(__SIZEOF_INT__ )
-#define __SIZEOF_INT__ 0
-#endif
+//// For Linux and OSX configuration is done automatically using Makefile.
+//// To get started type "make help".
+////
+//// For windows part of the configuration is detected automatically, but
+//// some switches need to be set manually:
+////
+//// -DNDEBUG       | Disable debugging mode. Use always.
+////
+//// -DNO_PREFETCH  | Disable use of prefetch asm-instruction. A must if you want the
+////                | executable to run on some very old machines.
+////
+//// -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.
 
-// Check for 64 bits for different compilers: Intel, MSVC and gcc
-#if defined(__x86_64) || defined(_M_X64) || defined(_WIN64) || (__SIZEOF_INT__ > 4)
+// Automatic detection for 64-bit under Windows
+#if defined(_WIN64)
 #define IS_64BIT
 #endif
 
-#if defined(IS_64BIT) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
+// Automatic detection for use of bsfq asm-instruction under Windows.
+// Works only in 64-bit mode. Does not work with MSVC.
+#if defined(_WIN64) && defined(__INTEL_COMPILER)
 #define USE_BSFQ
 #endif