main.cpp

#include <math.h>
#include <stdio.h>

float some = 0.0;

struct Foo {
	float x[2];
	//char name[1024*16];
	float res;
	//char name[1024*16];
	
	Foo() : x{some, some}, res{0} {some += 3.1415;}
	void scale(float s) {
		float dx = sqrtf(x[0]*x[0]+x[1]*x[1]);
		res += dx*s;
	}
};

struct UpFoo {
	float res;
};

void scale(Foo* f, float s) {
		float dx = sqrtf(f->x[0]*f->x[0]+f->x[1]*f->x[1]);
		f->res += dx*s;	
}

void update(Foo* foos, UpFoo* upfoos, int len, float some) {
	for (int i=0; i<len; ++i) {
		float m = sqrtf(foos[i].x[0]*foos[i].x[0] + foos[i].x[1]+foos[i].x[1]);
		upfoos[i].res = foos[i].res + m*some;
	}
}

int main() {
	const int len = 1024;
	printf("--\n");
	Foo* foos = new Foo[len];

	UpFoo* upfoos = new UpFoo[len];
	// for (int j=0; j<100000; j++)
	// for (int i=0; i<len; ++i)
	// 	//foos[i].scale(some);
	// 	scale(&(foos[i]), some);
	printf("-\n");
	for (int j=0; j<100000; j++)
		update(foos, upfoos, len, some);

	// for (int i=0; i<len; ++i)
	// 	printf("%f\n", foos[i].res);
	return 0;
}