c语言函数参数太多对性能是否有影响？

一般考虑用结构体来打包逻辑上相关的变量，传递给函数从而减少参数个数，那么这种方式对性能提升有帮助嘛？写了一个测试函数用来分析：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
typedef struct fun_p{
char c;
int
a;
int
b;
int
d;
long f;
}_funp;
int func(int aa, int bb, int cc, int dd, char c, int a, int b, int d, double f)
{
int ret = 0;
if(c > 10)
ret = c*c + a + b + d + f * 2;
else
ret = a + b + d + f * 2;
return ret + aa + bb + cc + dd;
}
int funcs(int aa, int bb, int cc, int dd, _funp * inp)
{
int ret = 0;
char c = inp->c;
int
a = inp->a;
int
b = inp->b;
int
d = inp->d;
double f = inp->f;
if(c > 10)
ret = c*c + a + b + d + f * 2;
else
ret = a + b + d + f * 2;
return ret + aa + bb + cc + dd;
}
int funcs2(int aa, int bb, int cc, int dd, _funp * inp)
{
int ret = 0;
char c = inp->c;
if(c > 10)
ret = c*c
+ inp->a + inp->b + inp->d + inp->f * 2;
else
ret = inp->a + inp->b + inp->d + inp->f * 2;
return ret + aa + bb + cc + dd;
}
int main(void)
{
struct timespec time_start = {0, 0}, time_end = {0, 0};
int aa = 9;
int bb = 12;
int cc = 39;
int dd = 90;
char c = 20;
int a = 98;
int b = 199;
int d = 23;
double f = 34.2;
struct fun_p funp;
int i, j;
int run_num = 1000;
long long total = 0;
funp.c = c;
funp.a = a;
funp.b = b;
funp.d = d;
funp.f = f;
clock_gettime(CLOCK_REALTIME, &time_start);
for (i = 0; i < run_num; i++)
for (j = 0; j < run_num; j++){
c = c + 1;
total += func(aa, bb, cc, dd, c, a, b, d, f);
}
clock_gettime(CLOCK_REALTIME, &time_end);
printf("func
duration:%llus %lluns. total = %lldn", time_end.tv_sec-time_start.tv_sec, time_end.tv_nsec-time_start.tv_nsec, total);
total = 0;
c = 20;
clock_gettime(CLOCK_REALTIME, &time_start);
for (i = 0; i < run_num; i++)
for (j = 0; j < run_num; j++){
funp.c = funp.c + 1;
total += funcs(aa, bb, cc, dd, &funp);
}
clock_gettime(CLOCK_REALTIME, &time_end);
printf("funcs
duration:%llus %lluns. total = %lldn", time_end.tv_sec-time_start.tv_sec, time_end.tv_nsec-time_start.tv_nsec, total);
total = 0;
funp.c = 20;
clock_gettime(CLOCK_REALTIME, &time_start);
for (i = 0; i < run_num; i++)
for (j = 0; j < run_num; j++){
funp.c = funp.c + 1;
total += funcs2(aa, bb, cc, dd, &funp);
}
clock_gettime(CLOCK_REALTIME, &time_end);
printf("funcs2 duration:%llus %lluns. total = %lldn", time_end.tv_sec-time_start.tv_sec, time_end.tv_nsec-time_start.tv_nsec, total);
return 1;
}

编译命令： gcc -O3 test_func_parameter.c -o test_func_parameter -lrt

结论：

3、如果函数本身计算量比较大，那可能参数的传输方式对性能影响就比较小了。

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