ASMC

//*********************************ASMC BY HENRIK STOLPE ***********************************////
//*****A SMALL EXAMPLE SHOWING HOW ASSEMBLER CAN BE USED WITHIN C TO SPEED UP CALCULATIONS***////
//*****IN THIS THE ASSEMBLER LOOP PERFORMS TWICE AS FAST AS THE C EQUIVALENT ,WHEN USING*****//// 
//*****MANY LOOPS AND ADVANCED VARIABLE PASSINGS THE CPU TIME SAVING IS CONSIDERATE!!********////
//*****IF THIS WHOLE PROGRAM BEEN WRITTEN IN ASSEMBLER NOT USING <STDIO.H> AND "PRINTF()"IT**//// 
//*****WOULD BE A 100 TIMES FASTER!****////


//ANSI C//
//USE _CDECL CALLING CONVENTION WHEN USING _ASM

#include <stdio.h>

int main(int num)
{

num=100000000;
printf("Counting down 1000000000 to 1 using C language..\n");
printf("PRESS KEY TO START!\n");
getch();
printf("%d DONE!\n",ccount(num));
printf("Counting down 1000000000 to 1 using assembler language!!\n");
printf("PRESS KEY TO START!");
getch();
printf("%d DONE!\n",acount(num));
getch();
return(0);
}

int ccount(int c)
{
while(c>0)
	{
	c--;
	}
return(c);
}


int acount(int a)
{
///////80486 SPECIFIC ASSEMBLER OPCODES, COULD EASILY BE EXCHANGED FOR 680xx OPCODES
	__asm mov ecx, a;
    __asm lg:;	
	__asm dec ecx;
    __asm loop lg ;
	__asm mov a,ecx;
return(a);
}