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kemi (statz)

#2, Főfasz (2970)

4356 | #2460 | ^ | Idézet | Sun, 17 Mar 2013 22:24:36 +01

94.21.*.*

*.pool.digikabel.hu

Ugyanaz a teszt, OOP vs imperatív megoldás, default, meg -O3 kapcsolókkal fordítva:

rnd2.h

#ifndef RND2_H_
#define RND2_H_

void srnd2(unsigned long int seed);
unsigned long int rnd2();

#endif

rnd2.cpp

unsigned long int __seed0, __seed1, __seed2, __seed3;

unsigned long int __rol(unsigned long int value, unsigned char offset)
{
	offset = offset & 0x1f;
	return (value << offset) | (value >> (0x20 - offset));
}

unsigned long int __ror(unsigned long int value, unsigned char offset)
{
	offset = offset & 0x1f;
	return (value >> offset) | (value << (0x20 - offset));
}

void srnd2(unsigned long int seed)
{
	__seed0 = seed;
	__seed1 = __seed0 ^ 0xaaaaaaaa;
	__seed1 = __rol(__seed1 >> 11, __seed1);
	__seed1 = __seed1 ^ (__seed1 >> 21);
	__seed2 = __seed0 ^ 0x55555555;
	__seed2 = __ror(__seed2 << 6, __seed2);
	__seed2 = __seed2 ^ (__seed2 >> 22);
	__seed3 = (__seed2 << 16) | (__seed1 >> 16);
}

unsigned long int rnd2()
{
	__seed1 = __rol(__seed1, 5);
	__seed2 = __ror(__seed2, 9);
	__seed0 = __rol(__seed0, 11);
	__seed0 ^= __seed1;
	__seed0 ^=  __rol(__seed1, 8) << 11;
	__seed0 ^= __ror(__seed2, 8) & 63;
	__seed0 ^= __rol(__seed3, 8) >> 5;
	__seed0 = __ror(__seed0, 14);
	__seed0 ^= __seed3;
	__seed1 ^= __seed3;
	__seed2 ^= __seed3;
	__seed3 = __ror(__seed3, __seed0);
	return __seed0;
}

imp.cpp

#include <cstdlib>
#include <ctime>
#include "rnd2.h"

int main() {
    srnd2(time(NULL));
    int table[256];
    int i, j, k, r, temp;
    for (i = 0; i < 1000; i++) {
	for (j = 0; j < 1000; j++) {
	    for (k = 0; k < 256; k++) table[k] = k;
	    for (k = 0; k < 256; k++) {
		r = rnd2() & 255;
		temp = table[r];
		table[k] = temp;
	    }
	}
    }
    return 0;
}

CRnd2.h

#ifndef CRND2_H_
#define CRND2_H_

class CRnd2 {
public:
    void srnd2(unsigned long int seed);
    unsigned long int rnd2();
private:
    unsigned long int __seed0;
    unsigned long int __seed1;
    unsigned long int __seed2;
    unsigned long int __seed3;

    unsigned long int __rol(unsigned long int value, unsigned char offset);
    unsigned long int __ror(unsigned long int value, unsigned char offset);

};

#endif

CRnd2.cpp

#include "CRnd2.h"

unsigned long int CRnd2::__rol(unsigned long int value, unsigned char offset)
{
	offset = offset & 0x1f;
	return (value << offset) | (value >> (0x20 - offset));
}

unsigned long int CRnd2::__ror(unsigned long int value, unsigned char offset)
{
	offset = offset & 0x1f;
	return (value >> offset) | (value << (0x20 - offset));
}

void CRnd2::srnd2(unsigned long int seed)
{
	__seed0 = seed;
	__seed1 = __seed0 ^ 0xaaaaaaaa;
	__seed1 = __rol(__seed1 >> 11, __seed1);
	__seed1 = __seed1 ^ (__seed1 >> 21);
	__seed2 = __seed0 ^ 0x55555555;
	__seed2 = __ror(__seed2 << 6, __seed2);
	__seed2 = __seed2 ^ (__seed2 >> 22);
	__seed3 = (__seed2 << 16) | (__seed1 >> 16);
}

unsigned long int CRnd2::rnd2()
{
	__seed1 = __rol(__seed1, 5);
	__seed2 = __ror(__seed2, 9);
	__seed0 = __rol(__seed0, 11);
	__seed0 ^= __seed1;
	__seed0 ^=  __rol(__seed1, 8) << 11;
	__seed0 ^= __ror(__seed2, 8) & 63;
	__seed0 ^= __rol(__seed3, 8) >> 5;
	__seed0 = __ror(__seed0, 14);
	__seed0 ^= __seed3;
	__seed1 ^= __seed3;
	__seed2 ^= __seed3;
	__seed3 = __ror(__seed3, __seed0);
	return __seed0;
}

oop.cpp

#include <cstdlib>
#include <ctime>
#include "CRnd2.h"

int main() {
    CRnd2 rnd = CRnd2();
    rnd.srnd2(time(NULL));
    int table[256];
    int i, j, k, r, temp;
    for (i = 0; i < 1000; i++) {
	for (j = 0; j < 1000; j++) {
	    for (k = 0; k < 256; k++) table[k] = k;
	    for (k = 0; k < 256; k++) {
		r = rnd.rnd2() & 255;
		temp = table[r];
		table[k] = temp;
	    }
	}
    }
    
    return 0;
}

kemi242@linuxmint ~/a $ time ./imp

real	0m21.088s
user	0m21.077s
sys	0m0.004s
kemi242@linuxmint ~/a $ time ./imp_O3

real	0m2.430s
user	0m2.424s
sys	0m0.000s
kemi242@linuxmint ~/a $ time ./oop

real	0m29.269s
user	0m29.266s
sys	0m0.000s
kemi242@linuxmint ~/a $ time ./oop_O3

real	0m2.454s
user	0m2.444s
sys	0m0.004s
kemi242@linuxmint ~/a $

Úgy látszik, az O3 kapcsoló nagyrészt kioptimalizálja az OOP hátrányait, ahol tudja.