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 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 done 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 isn't much difference~~