43 lines
638 B
C
43 lines
638 B
C
/*
|
|
* Copyright (c) 2006-2021, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2006-10-09 Bernard the first version for i386
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
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;
|
|
}
|