initial

public/tier0/hardware_clock_fast.h

@@ -0,0 +1,49 @@
+//========= Copyright c Valve Corporation, All rights reserved. ============//
+#ifndef TIER0_HARDWARE_TIMER
+#define TIER0_HARDWARE_TIMER
+
+#include "tier0/platform.h"
+
+#ifdef GNUC
+inline int GetHardwareClockFast( void )
+{
+	unsigned long long int nRet;
+	__asm__ volatile (".byte 0x0f, 0x31" : "=A" (nRet)); // rdtsc
+	return ( int ) nRet;
+}
+
+#else
+
+#ifdef _X360
+inline /*__declspec(naked)*/ int GetHardwareClockFast()
+{
+	/*__asm
+	{
+		lis		r3,08FFFh
+		ld		r3,011E0h(r3)
+		rldicl	r3,r3,32,32
+		blr
+	}  */
+	return __mftb32() << 6;
+}
+#elif defined( _PS3 )
+inline int GetHardwareClockFast()
+{
+	// The timebase frequency on PS/3 is 79.8 MHz, see sys_time_get_timebase_frequency()
+	// this works out to 40.10025 clock ticks per timebase tick
+	return __mftb() * 40;
+}
+#else
+
+#include <intrin.h>
+
+
+inline int GetHardwareClockFast()
+{
+	return __rdtsc();
+}
+#endif
+
+#endif
+
+#endif