44 lines
975 B
C
44 lines
975 B
C
|
|
||
|
|
/*
|
||
|
|
** Cycle count overhead. This is a number of cycles required to actually
|
||
|
|
** calculate the cycle count. To get the actual number of net cycles between
|
||
|
|
** two calls to GetCycleCount, subtract CCNT_OVERHEAD.
|
||
|
|
**
|
||
|
|
** For example:
|
||
|
|
**
|
||
|
|
** __int64 start, finish, actual_cycle_count;
|
||
|
|
**
|
||
|
|
** start = GetCycleCount ();
|
||
|
|
**
|
||
|
|
** ... do some stuff ...
|
||
|
|
**
|
||
|
|
** finish = GetCycleCount ();
|
||
|
|
**
|
||
|
|
** actual_cycle_count = finish - start - CCNT_OVERHEAD;
|
||
|
|
**
|
||
|
|
**
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define CCNT_OVERHEAD 8
|
||
|
|
|
||
|
|
|
||
|
|
#pragma warning( disable: 4035 ) /* Don't complain about lack of return value */
|
||
|
|
|
||
|
|
__inline __int64 GetCycleCount ()
|
||
|
|
{
|
||
|
|
__asm _emit 0x0F
|
||
|
|
__asm _emit 0x31 /* rdtsc */
|
||
|
|
// return EDX:EAX causes annoying warning
|
||
|
|
};
|
||
|
|
|
||
|
|
__inline unsigned GetCycleCount32 () // enough for about 40 seconds
|
||
|
|
{
|
||
|
|
__asm push EDX
|
||
|
|
__asm _emit 0x0F
|
||
|
|
__asm _emit 0x31 /* rdtsc */
|
||
|
|
__asm pop EDX
|
||
|
|
// return EAX causes annoying warning
|
||
|
|
};
|
||
|
|
|
||
|
|
#pragma warning( default: 4035 )
|