mirror of https://github.com/mpv-player/mpv
38 lines
896 B
C
38 lines
896 B
C
/*
|
|
fastmemcpybench.c used to benchmark fastmemcpy.h code from libvo.
|
|
|
|
Note: this code can not be used on PentMMX-PII because they contain
|
|
a bug in rdtsc. For Intel processors since P6(PII) rdpmc should be used
|
|
instead. For PIII it's disputable and seems bug was fixed but I don't
|
|
tested it.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "../libvo/fastmemcpy.h"
|
|
|
|
#define ARR_SIZE 100000
|
|
//#define ARR_SIZE 1000000
|
|
|
|
static inline unsigned long long int read_tsc( void )
|
|
{
|
|
unsigned long long int retval;
|
|
__asm __volatile ("rdtsc":"=A"(retval)::"memory");
|
|
return retval;
|
|
}
|
|
|
|
unsigned char arr1[ARR_SIZE],arr2[ARR_SIZE];
|
|
|
|
int main( void )
|
|
{
|
|
unsigned long long int v1,v2;
|
|
unsigned char * marr1,*marr2;
|
|
marr1 = &arr1[1];
|
|
marr2 = &arr2[3];
|
|
v1 = read_tsc();
|
|
memcpy(marr1,marr2,ARR_SIZE-4);
|
|
v2 = read_tsc();
|
|
printf("v1 = %llu v2 = %llu v2-v1=%llu\n",v1,v2,v2-v1);
|
|
return 0;
|
|
}
|