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/* $Id: divmoddi4.c 155244 2023-01-17 14:15:46Z bird $ */
/** @file
* IPRT - __divmoddi4 implementation
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#include <iprt/stdint.h>
#include <iprt/uint64.h>
int64_t __divmoddi4(int64_t i64A, int64_t i64B, int64_t *pi64R);
uint64_t __udivmoddi4(uint64_t u64A, uint64_t u64B, uint64_t *pu64R);
/**
* __divmoddi4() implementation to satisfy external references from 32-bit code
* generated by gcc-7 or later (more likely with gcc-11).
*
* @param i64A The divident value.
* @param i64B The divisor value.
* @param pi64R A pointer to the reminder. May be NULL.
* @returns i64A / i64B
*/
int64_t __divmoddi4(int64_t i64A, int64_t i64B, int64_t *pi64R)
{
int64_t i64Ret;
if (i64A >= 0)
{
/* Dividing two non-negative numbers is the same as unsigned division. */
if (i64B >= 0)
i64Ret = (int64_t)__udivmoddi4((uint64_t)i64A, (uint64_t)i64B, (uint64_t *)pi64R);
/* Dividing a non-negative number by a negative one yields a negative
result and positive remainder. */
else
i64Ret = -(int64_t)__udivmoddi4((uint64_t)i64A, (uint64_t)-i64B, (uint64_t *)pi64R);
}
else
{
uint64_t u64R;
/* Dividing a negative number by a non-negative one yields a negative
result and negative remainder. */
if (i64B >= 0)
i64Ret = -(int64_t)__udivmoddi4((uint64_t)-i64A, (uint64_t)i64B, &u64R);
/* Dividing two negative numbers yields a positive result and a
negative remainder. */
else
i64Ret = (int64_t)__udivmoddi4((uint64_t)-i64A, (uint64_t)-i64B, &u64R);
if (pi64R)
*pi64R = -(int64_t)u64R;
}
return i64Ret;
}
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