#include <objc/Object.h>

static inline unsigned long long int llclock(void)
{
	unsigned long long int a;
	asm volatile ("rdtsc" : "=&A" (a));
	return a;
}

void foo(void) __attribute__ ((weak));
void foo(void)
{
}

void foo2(id foo, SEL s) __attribute__ ((weak));
void foo2(id foo, SEL s)
{
}

int i=1000;

void (*foo2_id)(id,SEL)=foo2;

@implementation Object (foo)
-(void) foo
{
}
@end

int main(int argc, char **argv)
{
	unsigned long long int t1,t2;
	id self=[Object alloc];
	SEL cmd=@selector(foo);
	void (*foo3)(id,SEL)=foo2_id;

	t1=llclock();
	while (i--)
	{
//		foo(); /* ~6 cycles/call */
//		foo2(self,cmd); /* ~8 cycles/call */
//		foo3(self,cmd); /* ~9 cycles/call */
		[self foo]; /* ~24 cycles/call */
	}
	t2=llclock();
	t2-=t1;

	printf("%llu clock cycles\n",t2);

	return 0;
}