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assembler assignment

Anonymous Coward

Subject: assembler assignment · Posted: 2004-11-24, 03:20pm

Rank: Unregistered

hey all,

i need to program a function in intel's assembly language that adds to doubles (IEEE64) and displays the result

our prof gave us this sample code that does the work in c++, we can check our answers with the results that his program displays

Code:

#include <iostream.h>
#include <iomanip.h>
// macros
#define HEX8 setw(8) << setfill('0') << hex
#define NL cout << endl
#define REAL15 hex << setprecision(15)
// Variables globales
union huitoctets
{
unsigned int ival[2];
double dval;
};
huitoctets a, b, c;
// Prototype de fonction
void display (char *str);
int Add (huitoctets & ma, huitoctets & mb, huitoctets & result);
void main (void)
{
int ret;
//a.ival[1] = 0x35EE0674;
a.ival[1] = 0x701FF674;
a.ival[0] = 0x567ACDCF;
//b.ival[1] = 0x35AEFBBB;
b.ival[1] = 0xF01FF67B;
b.ival[0] = 0xDA6FDF56;
// Visualisation des donnÃ�Â©es sous forme RÃ�ï¿½EL et IEEE64
NL;
cout << "Valeur de a : ";
cout << setprecision(15) << a.dval ;
NL; NL;
cout << HEX8 << a.ival[1] << " " << HEX8 << a.ival[0];
NL; NL;
cout << "Valeur de b : ";
cout << setprecision(15) << b.dval ;
NL; NL;
cout << HEX8 << b.ival[1] << " " << HEX8 << b.ival[0] ;
NL; NL;
// addition en IEEE
c.dval = a.dval + b.dval;
display ("a + b");
// RÃ�Â©sultat avec l'assembleur
ret = Add (a, b, c);
display ("c");
// Mettre ici tous les autres tests
};
void display (char *str)
{
NL; NL;
cout << "Valeur de " << str << " : ";
cout << setprecision(15) << c.dval ;
NL; NL;
cout << HEX8 << c.ival[1] << " " << HEX8 << c.ival[0] ;
NL; NL;
}
int Add (huitoctets & ma, huitoctets & mb, huitoctets & result)
{
int ret=0;
__asm
{
//--- votre code ---
}
return ret;
}

he explained to us that we needed to push all the ?registers? (in french we call them "des rÃ�Â©gistres" such as EAX, ESP and EBX)

and that we had to pop them back at the end... can someone clear me up maybe?

thanks!

in case, my email is sinstone@gmail.com

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Anonymous Coward

Subject: Re: assembler assignment · Posted: 2004-11-30, 08:59am

Rank: Unregistered