#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#define TEST_MAX_SIZE (10)
struct timeval testTime[TEST_MAX_SIZE];
int testCount[TEST_MAX_SIZE];
struct timeval tmpTime[TEST_MAX_SIZE], tmpTime2;
#define TIME_TEST(index,...) \
do \
{ \
gettimeofday(&tmpTime[index], NULL); \
__VA_ARGS__ \
gettimeofday(&tmpTime2, NULL); \
timeSub(&testTime[index], &tmpTime[index]); \
timeAdd(&testTime[index], &tmpTime2); \
testCount[index]++; \
} while (0);
void timeAdd(struct timeval *t1, struct timeval *t2) {
t1->tv_sec += t2->tv_sec;
t1->tv_usec += t2->tv_usec;
if(t1->tv_usec > 1000000) {
t1->tv_sec++;
t1->tv_usec -= 1000000;
}
}
void timeSub(struct timeval *t1, struct timeval *t2) {
t1->tv_sec -= t2->tv_sec;
t1->tv_usec -= t2->tv_usec;
if(t1->tv_usec < 0) {
t1->tv_sec--;
t1->tv_usec += 1000000;
}
}
void printTestResult() {
int i = 0;
for(i = 0; i < TEST_MAX_SIZE; i++) {
fprintf(stderr, "index:%-2d count:%-8d time:%ldms\n", i, testCount[i], testTime[i].tv_sec*1000+testTime[i].tv_usec/1000);
}
}
main() {
unsigned int i, j, k = 1;
float f = 1.23456f;
TIME_TEST(0,
i = 0;
while(i++ < 0x00ffffff) k +=i/k;
)
i = 0;
TIME_TEST(1,
while(i++ < 0xff) {
TIME_TEST(2,
j = 0;
while(j++ < 0x0000ffff) k +=i/k;
)
}
)
TIME_TEST(3,
i = 0;
while(i++ < 0x00ffffff) f += 1.0f/i;
)
printf("k=%d f=%f\n", k, f);
printTestResult();
}
留作后用