#endif
+#if !defined(NO_PREFETCH)
+# include <xmmintrin.h>
+#endif
+
#include <cassert>
#include <cstdio>
-#include <cstring>
#include <iomanip>
#include <iostream>
#include <sstream>
#include "bitcount.h"
#include "misc.h"
+#include "thread.h"
using namespace std;
/// Version number. If this is left empty, the current date (in the format
/// YYMMDD) is used as a version number.
-static const string EngineVersion = "1.7";
+static const string EngineVersion = "";
static const string AppName = "Stockfish";
static const string AppTag = "";
//// Variables
////
-bool Chess960;
-
uint64_t dbg_cnt0 = 0;
uint64_t dbg_cnt1 = 0;
const string engine_name() {
- const string cpu64(CpuHas64BitPath ? " 64bit" : "");
+ const string cpu64(CpuIs64Bit ? " 64bit" : "");
if (!EngineVersion.empty())
- return AppName+ " " + EngineVersion + cpu64;
+ return AppName + " " + EngineVersion + cpu64;
string date(__DATE__); // From compiler, format is "Sep 21 2008"
string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
}
-/// builtin_cpu_count() tries to detect the number of CPU cores, if
-/// hyper-threading is enabled this is the number of logical processors.
+/// cpu_count() tries to detect the number of CPU cores.
#if !defined(_MSC_VER)
# if defined(_SC_NPROCESSORS_ONLN)
-static int builtin_cpu_count() {
- return Min(sysconf(_SC_NPROCESSORS_ONLN), 8);
+int cpu_count() {
+ return Min(sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
}
# elif defined(__hpux)
-static int builtin_cpu_count() {
+int cpu_count() {
struct pst_dynamic psd;
if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
return 1;
- return Min(psd.psd_proc_cnt, 8);
+ return Min(psd.psd_proc_cnt, MAX_THREADS);
}
# else
-static int builtin_cpu_count() {
+int cpu_count() {
return 1;
}
# endif
#else
-static int builtin_cpu_count() {
+int cpu_count() {
SYSTEM_INFO s;
GetSystemInfo(&s);
- return Min(s.dwNumberOfProcessors, 8);
+ return Min(s.dwNumberOfProcessors, MAX_THREADS);
}
#endif
-/// HT_enabled() returns true if hyper-threading is enabled on current machine
-
-static bool HT_enabled() {
-
- char CPUString[0x20];
- int CPUInfo[4] = {-1};
- int nIds, nLogicalCPU, nCores;
-
- // Detect CPU producer
- __cpuid(CPUInfo, 0);
- nIds = CPUInfo[0];
-
- memset(CPUString, 0, sizeof(CPUString));
- memcpy(&CPUString[0], &CPUInfo[1], sizeof(int));
- memcpy(&CPUString[4], &CPUInfo[3], sizeof(int));
- memcpy(&CPUString[8], &CPUInfo[2], sizeof(int));
-
- // Not an Intel CPU or CPUID.4 not supported
- if (strcmp(CPUString, "GenuineIntel") || nIds < 4)
- return false;
-
- // Detect if HT Technology is supported
- __cpuid(CPUInfo, 1);
- if (!((CPUInfo[3] >> 28) & 1))
- return false;
-
- nLogicalCPU = (CPUInfo[1] >> 16) & 0xFF;
-
- // Detect number of cores
- __cpuid(CPUInfo, 4);
- nCores = 1 + ((CPUInfo[0] >> 26) & 0x3F);
-
- return nLogicalCPU > nCores;
-}
-
-
-/// cpu_count() tries to detect the number of physical CPU cores taking
-/// in account hyper-threading.
-
-int cpu_count() {
-
- return HT_enabled() ? builtin_cpu_count() / 2 : builtin_cpu_count();
-}
-
-
/*
From Beowulf, from Olithink
*/
return 0;
}
}
+
+#endif
+
+/// prefetch() preloads the given address in L1/L2 cache. This is a non
+/// blocking function and do not stalls the CPU waiting for data to be
+/// loaded from RAM, that can be very slow.
+#if defined(NO_PREFETCH)
+void prefetch(char*) {}
+#else
+
+void prefetch(char* addr) {
+
+#if defined(__INTEL_COMPILER) || defined(__ICL)
+ // This hack prevents prefetches to be optimized away by
+ // Intel compiler. Both MSVC and gcc seems not affected.
+ __asm__ ("");
+#endif
+
+ _mm_prefetch(addr, _MM_HINT_T2);
+ _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead
+}
+
#endif
+