+#define POPCNT_INTRINSIC(x) (int)__popcnt64(x)
+
+#elif defined(__GNUC__) && defined(USE_POPCNT) // Gcc compiler
+
+inline void __cpuid(unsigned int op,
+ unsigned int *eax, unsigned int *ebx,
+ unsigned int *ecx, unsigned int *edx)
+{
+ *eax = op;
+ *ecx = 0;
+ __asm__("cpuid" : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
+ : "0" (*eax), "2" (*ecx));
+}
+
+inline bool cpu_has_popcnt() {
+
+ unsigned int eax, ebx, ecx, edx;
+ __cpuid(1, &eax, &ebx, &ecx, &edx);
+ return (ecx >> 23) & 1;
+}
+
+#define POPCNT_INTRINSIC(x) ({ \
+ unsigned long __ret; \
+ __asm__("popcnt %1, %0" : "=r" (__ret) : "r" (x)); \
+ __ret; })