X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitcount.h;h=199fcf192bd980b0b4b0eed327dfb843566c2011;hp=63d7704b91edbb85643def092c194eeb468151bc;hb=90e83fa879ccdba066962ad0a9aa5be7c4cd1956;hpb=9fc602bae74b8e09bd45ace3b42a8ce84d56b23c

diff --git a/src/bitcount.h b/src/bitcount.h
index 63d7704b..199fcf19 100644
--- a/src/bitcount.h
+++ b/src/bitcount.h
@@ -18,33 +18,28 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(BITCOUNT_H_INCLUDED)
 #define BITCOUNT_H_INCLUDED
 
 #include "types.h"
 
-// Select type of intrinsic bit count instruction to use, see
-// README.txt on how to pgo compile with POPCNT support.
-#if !defined(USE_POPCNT)
-#define POPCNT_INTRINSIC(x) 0
-#elif defined(_MSC_VER)
-#define POPCNT_INTRINSIC(x) (int)__popcnt64(x)
-#elif defined(__GNUC__)
-
-#define POPCNT_INTRINSIC(x) ({ \
-   unsigned long __ret; \
-   __asm__("popcnt %1, %0" : "=r" (__ret) : "r" (x)); \
-   __ret; })
-
-#endif
-
-
-/// Software implementation of bit count functions
+enum BitCountType {
+    CNT64,
+    CNT64_MAX15,
+    CNT32,
+    CNT32_MAX15,
+    CNT_POPCNT
+};
 
-#if defined(IS_64BIT)
-
-inline int count_1s(Bitboard b) {
+/// count_1s() counts the number of nonzero bits in a bitboard.
+/// We have different optimized versions according if platform
+/// is 32 or 64 bits, and to the maximum number of nonzero bits.
+/// We also support hardware popcnt instruction. See Readme.txt
+/// on how to pgo compile with popcnt support.
+template<BitCountType> inline int count_1s(Bitboard);
+
+template<>
+inline int count_1s<CNT64>(Bitboard b) {
   b -= ((b>>1) & 0x5555555555555555ULL);
   b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
   b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
@@ -52,16 +47,16 @@ inline int count_1s(Bitboard b) {
   return int(b >> 56);
 }
 
-inline int count_1s_max_15(Bitboard b) {
+template<>
+inline int count_1s<CNT64_MAX15>(Bitboard b) {
   b -= (b>>1) & 0x5555555555555555ULL;
   b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
   b *= 0x1111111111111111ULL;
   return int(b >> 60);
 }
 
-#else // if !defined(IS_64BIT)
-
-inline int count_1s(Bitboard b) {
+template<>
+inline int count_1s<CNT32>(Bitboard b) {
   unsigned w = unsigned(b >> 32), v = unsigned(b);
   v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
   w -= (w >> 1) & 0x55555555;
@@ -73,7 +68,8 @@ inline int count_1s(Bitboard b) {
   return int(v >> 24);
 }
 
-inline int count_1s_max_15(Bitboard b) {
+template<>
+inline int count_1s<CNT32_MAX15>(Bitboard b) {
   unsigned w = unsigned(b >> 32), v = unsigned(b);
   v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
   w -= (w >> 1) & 0x55555555;
@@ -84,51 +80,19 @@ inline int count_1s_max_15(Bitboard b) {
   return int(v >> 28);
 }
 
-#endif // BITCOUNT
-
-
-/// count_1s() counts the number of nonzero bits in a bitboard.
-/// If template parameter is true an intrinsic is called, otherwise
-/// we fallback on a software implementation.
-
-template<bool UseIntrinsic>
-inline int count_1s(Bitboard b) {
-
-  return UseIntrinsic ? POPCNT_INTRINSIC(b) : count_1s(b);
-}
-
-template<bool UseIntrinsic>
-inline int count_1s_max_15(Bitboard b) {
-
-  return UseIntrinsic ? POPCNT_INTRINSIC(b) : count_1s_max_15(b);
-}
-
-
-// Detect hardware POPCNT support
-inline bool cpu_has_popcnt() {
-
-  int CPUInfo[4] = {-1};
-  __cpuid(CPUInfo, 0x00000001);
-  return (CPUInfo[2] >> 23) & 1;
-}
-
-
-// Global constant initialized at startup that is set to true if
-// CPU on which application runs supports POPCNT intrinsic. Unless
-// USE_POPCNT is not defined.
-#if defined(USE_POPCNT)
-const bool CpuHasPOPCNT = cpu_has_popcnt();
-#else
-const bool CpuHasPOPCNT = false;
-#endif
-
-
-// Global constant used to print info about the use of 64 optimized
-// functions to verify that a 64 bit compile has been correctly built.
-#if defined(IS_64BIT)
-const bool CpuHas64BitPath = true;
-#else
-const bool CpuHas64BitPath = false;
+template<>
+inline int count_1s<CNT_POPCNT>(Bitboard b) {
+#if !defined(USE_POPCNT)
+  return int(b != 0); // Avoid 'b not used' warning
+#elif defined(_MSC_VER) && defined(__INTEL_COMPILER)
+  return _mm_popcnt_u64(b);
+#elif defined(_MSC_VER)
+  return (int)__popcnt64(b);
+#elif defined(__GNUC__)
+  unsigned long ret;
+  __asm__("popcnt %1, %0" : "=r" (ret) : "r" (b));
+  return ret;
 #endif
+}
 
 #endif // !defined(BITCOUNT_H_INCLUDED)