Print info about use of 64bit functions and hardware POPCNT
[stockfish] / src / bitcount.h
index 12826a9f9a05472c6e48066c202b55e0eea158ea..c6e969a82411d4b37dc1633e512ca5873d4a2912 100644 (file)
 #if !defined(BITCOUNT_H_INCLUDED)
 #define BITCOUNT_H_INCLUDED
 
+// To disable POPCNT support uncomment following line. You should do it only
+// in PGO compiling to exercise the default fallback path. Don't forget to
+// re-comment the line for the final optimized compile though ;-)
+//#define DISABLE_POPCNT_SUPPORT
+
+
 #include "bitboard.h"
 
 
@@ -48,7 +54,7 @@
 
 // Select type of intrinsic bit count instruction to use
 
-#if defined(_MSC_VER) // Microsoft compiler
+#if defined(_MSC_VER) && defined(_WIN64) // Microsoft compiler
 
 #include <intrin.h>
 
@@ -159,4 +165,22 @@ inline int count_1s_max_15(Bitboard b) {
 }
 
 
+// Global variable initialized at startup that is set to true if
+// CPU on which application runs supports POPCNT intrinsic. Unless
+// DISABLE_POPCNT_SUPPORT is defined.
+#if defined(DISABLE_POPCNT_SUPPORT)
+const bool CpuHasPOPCNT = false;
+#else
+const bool CpuHasPOPCNT = cpu_has_popcnt();
+#endif
+
+
+// Global variable used to print info about the use of 64 optimized
+// functions to verify that a 64bit compile has been correctly built.
+#if defined(BITCOUNT_SWAR_64)
+const bool CpuHas64BitPath = true;
+#else
+const bool CpuHas64BitPath = false;
+#endif
+
 #endif // !defined(BITCOUNT_H_INCLUDED)