Useless card constant experiment

Useless Card Constant Experiment#

I remembered someone saying that the ternary operator is slower than if-else,

and someone else said that adding inline actually makes it slower

So, let's do an experiment.

~~(I'm embarrassed to even put up such a stupid experiment)~~

"Functions" written in three ways. Because I'm too lazy, I used the simplest max

#define max(a, b) ((a) > (b) ? (a) : (b))

int max (int a, int b) {
	if (a > b) return a;
	else return b;
}

int max (int a, int b) {
	return ((a) > (b) ? (a) : (b));
}

The last two were tested with and without inline

Main program

Using rand() without srand() to generate data, so it's not only randomly distributed, but also the total data is the same

int main (void) {
	for (int i = 1; i <= 100000000; ++i) {
		int x = rand(), y = rand();
		int z = max(x, y);
	}
	return 0;
}

Following the principles of scientific experiments, each test was conducted five times, and the average value was taken

From top to bottom: define, if without inline, if with inline, ternary without inline, ternary with inline

define is very fast, use it as much as possible

The ternary operator is faster than if-else

inline is faster than without inline
。。。。。。。。。。。。
~~It seems like there's not much difference~~