Question

I hacked a following code:

unsigned long long get_cc_time () volatile {   uint64 ret;   __asm__ __volatile__('rdtsc' : '=A' (ret) : :);   return ret; } 

It works on g++ but not on Visual Studio. How can I port it ? What are the right macros to detect VS / g++ ?

Answer 1

#if defined(_MSC_VER) // visual c #elif defined(__GCCE__) // gcce #else // unknown #endif 

My inline assembler skills are rusty, but it works like:

__asm { // some assembler code } 

But to just use rdtsc you can just use intrinsics:

unsigned __int64 counter; counter = __rdtsc(); 

http://msdn.microsoft.com/en-us/library/twchhe95.aspx