47 lines
827 B
C
47 lines
827 B
C
/*
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* File : __umodsi3.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2006-10-09 Bernard the first version for i386
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*/
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#include <stdint.h>
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uint32_t __umodsi3(uint32_t num, uint32_t den)
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{
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register uint32_t quot = 0, qbit = 1;
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if (den == 0)
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{
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asm volatile ("int $0");
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return 0; /* if trap returns... */
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}
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/* left-justify denominator and count shift */
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while ((int32_t) den >= 0)
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{
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den <<= 1;
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qbit <<= 1;
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}
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while (qbit)
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{
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if (den <= num)
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{
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num -= den;
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quot += qbit;
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}
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den >>= 1;
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qbit >>= 1;
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}
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return num;
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}
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