Intel 汇编指令DIV实现

看过一篇文章将的是在AVR上实现intel 汇编daa指令.刚好我看到了<vhdl数字电路设计教程>这本书,上面讲到了定点除法.然后我也实现了下.

#include <stdio.h>
unsigned int my_div(unsigned int *src,unsigned int dst);
int main()
{

        unsigned int src = 100;
	unsigned int dst = 7;
	
	unsigned int out;
	out = my_div(&src,dst);
	
	printf("out:= %d \nsrc:= %d",
			out,src);
	return 0;
}

/*
 *  *src = *src mod dst
 *  return *src/dst
 */

unsigned int my_div(unsigned int *src,unsigned int dst)
{
	unsigned int tmpsrc = *src;
	unsigned int dstcount = 0;
    unsigned int srccount = 0;
	unsigned int tmp;
	unsigned int left;
	unsigned int out = 0;
	tmp = tmpsrc;
	while(tmp)
	{
		srccount++;
		tmp = tmp>>1;
	}
	printf("srccount:%d\n",srccount);

	tmp = dst;
	while(tmp)
	{
		dstcount++;
		tmp = tmp>>1;
	}
	printf("dstcount:%d\n",dstcount);
	
	left = srccount - dstcount+1;
	printf("left:%d\n",left);
	while(left--)
	{	
		printf("xx\n");
		printf("tmpsrc>>left:%x\n",tmpsrc>>left);
		printf("dst:%x\n",dst);
		if((tmpsrc >> left) > dst)
		{
			printf("int >: 1<< left\n",dst<<left);
			out |= 1<<left;//set out
			tmpsrc-=dst<<left;			
		}
		printf("\n");
	}
		

	*src = tmpsrc;
	return out;
}