50 lines
878 B
C
50 lines
878 B
C
|
/*
|
||
|
|
* File : __udivsi3.c
|
||
|
|
* This file is part of RT-Thread RTOS
|
||
|
|
* COPYRIGHT (C) 2006, RT-Thread Develop Team
|
||
|
|
*
|
||
|
|
* The license and distribution terms for this file may be
|
||
|
|
* found in the file LICENSE in this distribution or at
|
||
|
|
* http://openlab.rt-thread.com/license/LICENSE
|
||
|
|
*
|
||
|
|
* Change Logs:
|
||
|
|
* Date Author Notes
|
||
|
|
* 2006-10-09 Bernard the first version for i386
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <rtthread.h>
|
||
|
|
|
||
|
|
typedef rt_uint32_t uint32_t;
|
||
|
|
typedef rt_int32 int32_t;
|
||
|
|
|
||
|
|
uint32_t __udivsi3(uint32_t num, uint32_t den)
|
||
|
|
{
|
||
|
|
uint32_t quot = 0, qbit = 1;
|
||
|
|
|
||
|
|
if (den == 0)
|
||
|
|
{
|
||
|
|
asm volatile ("int $0");
|
||
|
|
return 0; /* If trap returns... */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Left-justify denominator and count shift */
|
||
|
|
while ((int32_t) den >= 0)
|
||
|
|
{
|
||
|
|
den <<= 1;
|
||
|
|
qbit <<= 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (qbit)
|
||
|
|
{
|
||
|
|
if (den <= num)
|
||
|
|
{
|
||
|
|
num -= den;
|
||
|
|
quot += qbit;
|
||
|
|
}
|
||
|
|
den >>= 1;
|
||
|
|
qbit >>= 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return quot;
|
||
|
|
}
|