Retire run-time detection of hardware POPCNT

[stockfish] / src / types.h

diff --git a/src/types.h b/src/types.h
index b73eccbac09c89a015de01cfe2afcb873be51152..3934c2912d032ee51bff7920aef66e939c3e76b0 100644 (file)
--- a/src/types.h
+++ b/src/types.h
@@ -124,30 +124,22 @@ inline void __cpuid(int CPUInfo[4], int)
 #define FORCE_INLINE  inline
 #endif
 
-/// 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.
+/// HasPopCnt is a global constant initialized at compile time that is set to
+/// true if CPU on which application runs supports popcnt hardware instruction.
 #if defined(USE_POPCNT)
-const bool CpuHasPOPCNT = cpu_has_popcnt();
+const bool HasPopCnt = true;
 #else
-const bool CpuHasPOPCNT = false;
+const bool HasPopCnt = 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.
+/// Is64Bit 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;
+const bool Is64Bit = true;
 #else
-const bool CpuIs64Bit = false;
+const bool Is64Bit = false;
 #endif
 
 #include <string>