X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftypes.h;h=70b1b813c92af81edae6ff95123b18b8a54fa126;hp=67e40fffd2c53ba54164c8910f99fd407cdd0a98;hb=69726f4df3b35b06deabc66d4b4ed5f695ea3fc2;hpb=f3e0b32def471a698e855061aa8e728657248a0f

diff --git a/src/types.h b/src/types.h
index 67e40fff..70b1b813 100644
--- a/src/types.h
+++ b/src/types.h
@@ -146,4 +146,31 @@ inline void operator-= (T& d1, const T d2) { d1 = d1 - d2; } \
 inline void operator*= (T& d, int i) { d = T(int(d) * i); } \
 inline void operator/= (T& d, int i) { d = T(int(d) / i); }
 
+
+/// cpu_has_popcnt() detects support for popcnt instruction at runtime
+inline bool cpu_has_popcnt() {
+
+  int CPUInfo[4] = {-1};
+  __cpuid(CPUInfo, 0x00000001);
+  return (CPUInfo[2] >> 23) & 1;
+}
+
+/// CpuHasPOPCNT is a global constant initialized at startup that
+/// is set to true if CPU on which application runs supports popcnt
+/// hardware instruction. Unless USE_POPCNT is not defined.
+#if defined(USE_POPCNT)
+const bool CpuHasPOPCNT = cpu_has_popcnt();
+#else
+const bool CpuHasPOPCNT = false;
+#endif
+
+
+/// CpuIs64Bit is a global constant initialized at compile time that
+/// is set to true if CPU on which application runs is a 64 bits.
+#if defined(IS_64BIT)
+const bool CpuIs64Bit = true;
+#else
+const bool CpuIs64Bit = false;
+#endif
+
 #endif // !defined(TYPES_H_INCLUDED)