1 files changed, 28 insertions, 0 deletions
diff --git a/test/timing/timing.h b/test/timing/timing.h
new file mode 100644
index 000000000..bb6c41eb2
--- /dev/null
+++ b/test/timing/timing.h
@@ -0,0 +1,28 @@
+#include <mach/mach_time.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+double intervalInCycles( uint64_t startTime, uint64_t endTime )
+{
+	uint64_t rawTime = endTime - startTime;
+	static double conversion = 0.0;
+	
+	if( 0.0 == conversion )
+	{
+		mach_timebase_info_data_t	info;
+		kern_return_t err = mach_timebase_info( &info );
+		if( 0 != err )
+			return 0;
+		
+		uint64_t freq = 0;
+		size_t freqSize = sizeof( freq );
+		int err2 = sysctlbyname( "hw.cpufrequency", &freq, &freqSize, NULL, 0L );
+		if( 0 != err2 )
+			return 0;
+		
+		conversion = (double) freq * (1e-9 * (double) info.numer / (double) info.denom);
+	}
+	
+	return (double) rawTime * conversion;
+}
+