+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; })
+
+#else // Safe fallback for unsupported compilers or when USE_POPCNT is disabled