burgerbee

/* speed.c - speedtest */#include <stdlib.h>#include <stdio.h>#include <sys/time.h>#include <time.h>#include <string.h>#include <unistd.h>#define N   10E6__inline__ unsigned long long cycles() {  unsigned long long int result=0;  unsigned long int upper, lower,tmp;  __asm__ volatile(                "0:                  \n"                "\tmftbu   %0           \n"                "\tmftb    %1           \n"                "\tmftbu   %2           \n"                "\tcmpw    %2,%0        \n"                "\tbne     0b         \n"                : "=r"(upper),"=r"(lower),"=r"(tmp)                );  result = upper;  result = result<<32;  result = result|lower;  return(result);}int main(int argc, char **argv) {    int                i, attempt, t_ms;    struct timeval     tv_before;    struct timeval     tv_after;    unsigned long long t_before_ms, t_after_ms;    unsigned long long before_clocks, after_clocks;    unsigned long long start_cycles;    for (attempt=0; attempt<3;attempt++) {        gettimeofday(&tv_before, NULL);        before_clocks = cycles();        for(i=0; i<N; i++) {            start_cycles = cycles();        }        after_clocks = cycles();        gettimeofday(&tv_after, NULL);        t_before_ms = 1000*tv_before.tv_sec + tv_before.tv_usec/1000;        t_after_ms = 1000*tv_after.tv_sec + tv_after.tv_usec/1000;        t_ms = t_after_ms - t_before_ms;        printf("10E6 RDTSC time=%d ms\n", t_ms);    }    return 0;}