# os = (name) --- --- Target operating system
# bits = 64/32 --- -DIS_64BIT --- 64-/32-bit operating system
# bigendian = no/yes --- -DBIGENDIAN --- big/little-endian byte order
-# prefetch = no/yes --- -DPREFETCH --- Use prefetch x86 asm-instruction
+# prefetch = no/yes --- -DUSE_PREFETCH --- Use prefetch x86 asm-instruction
# bsfq = no/yes --- -DUSE_BSFQ --- Use bsfq x86_64 asm-instruction
# --- (Works only with GCC and ICC 64-bit)
# popcnt = no/yes --- -DUSE_POPCNT --- Use popcnt x86_64 asm-instruction
#include <cassert>
#include <cmath>
#include <cstring>
-#if !(defined(__hpux) || defined(__ppc__) || defined(__ppc64__) || defined(__arm__))
+#if defined(USE_PREFETCH)
# include <xmmintrin.h>
#endif
/// to be loaded from RAM, that can be very slow. When we will
/// subsequently call retrieve() the TT data will be already
/// quickly accessible in L1/L2 CPU cache.
-#if defined(__hpux) || defined(__ppc__) || defined(__ppc64__) || defined(__arm__)
-void TranspositionTable::prefetch(const Key) const {} // Not supported on HP UX
+#if !defined(USE_PREFETCH)
+void TranspositionTable::prefetch(const Key) const {}
#else
void TranspositionTable::prefetch(const Key posKey) const {
////
-//// 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)