[cpu] perform check in separate function

Signed-off-by: r4sas <[email protected]>

libi2pd/CPU.cpp

@@ -9,24 +9,49 @@
 #include "CPU.h"
 #include "Log.h"
 
+#if defined(_MSC_VER)
+#include <intrin.h>
+
+#ifndef bit_AES
+	#define bit_AES (1 << 25)
+#endif
+#endif
+
 namespace i2p
 {
 namespace cpu
 {
 	bool aesni = false;
 
-	void Detect(bool AesSwitch, bool force)
+	inline bool cpu_support_aes()
 	{
-#if defined(__x86_64__) || defined(__i386__)
-		__builtin_cpu_init ();
-#if defined (_WIN32) && (WINVER == 0x0501) // WinXP
-		if (AesSwitch && force) { // only if forced
+#if (_M_AMD64 || __x86_64__) || (_M_IX86 || __i386__)
+#if defined(_MSC_VER)
+		int cpu_info[4];
+		__cpuid(cpu_info, 1);
+		return ((cpu_info[2] & bit_AES) != 0)
+#elif defined(__clang__)
+#if __clang_major__ >= 6
+		__builtin_cpu_init();
+#endif
+		return __builtin_cpu_supports("aes");
+#elif defined(__GNUC__)
+		__builtin_cpu_init();
+		return __builtin_cpu_supports("aes");
+#else
+		return false;
+#endif
 #else
-		if ((__builtin_cpu_supports ("aes") && AesSwitch) || (AesSwitch && force)) {
+		return false;
 #endif
+	}
+
+	void Detect(bool AesSwitch, bool force)
+	{
+		if ((cpu_support_aes() && AesSwitch) || (AesSwitch && force)) {
 			aesni = true;
 		}
-#endif
+
 		LogPrint(eLogInfo, "AESNI ", (aesni ? "enabled" : "disabled"));
 	}
 }