| 1 | /* $Id: divmoddi4.c 98103 2023-01-17 14:15:46Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - __divmoddi4 implementation
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 10 | * available from https://www.alldomusa.eu.org.
|
|---|
| 11 | *
|
|---|
| 12 | * This program is free software; you can redistribute it and/or
|
|---|
| 13 | * modify it under the terms of the GNU General Public License
|
|---|
| 14 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 15 | * License.
|
|---|
| 16 | *
|
|---|
| 17 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 20 | * General Public License for more details.
|
|---|
| 21 | *
|
|---|
| 22 | * You should have received a copy of the GNU General Public License
|
|---|
| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 24 | *
|
|---|
| 25 | * The contents of this file may alternatively be used under the terms
|
|---|
| 26 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
|---|
| 28 | * in the VirtualBox distribution, in which case the provisions of the
|
|---|
| 29 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 30 | *
|
|---|
| 31 | * You may elect to license modified versions of this file under the
|
|---|
| 32 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 33 | *
|
|---|
| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
|---|
| 35 | */
|
|---|
| 36 |
|
|---|
| 37 | #include <iprt/stdint.h>
|
|---|
| 38 | #include <iprt/uint64.h>
|
|---|
| 39 |
|
|---|
| 40 | int64_t __divmoddi4(int64_t i64A, int64_t i64B, int64_t *pi64R);
|
|---|
| 41 | uint64_t __udivmoddi4(uint64_t u64A, uint64_t u64B, uint64_t *pu64R);
|
|---|
| 42 |
|
|---|
| 43 | /**
|
|---|
| 44 | * __divmoddi4() implementation to satisfy external references from 32-bit code
|
|---|
| 45 | * generated by gcc-7 or later (more likely with gcc-11).
|
|---|
| 46 | *
|
|---|
| 47 | * @param i64A The divident value.
|
|---|
| 48 | * @param i64B The divisor value.
|
|---|
| 49 | * @param pi64R A pointer to the reminder. May be NULL.
|
|---|
| 50 | * @returns i64A / i64B
|
|---|
| 51 | */
|
|---|
| 52 | int64_t __divmoddi4(int64_t i64A, int64_t i64B, int64_t *pi64R)
|
|---|
| 53 | {
|
|---|
| 54 | int64_t i64Ret;
|
|---|
| 55 | if (i64A >= 0)
|
|---|
| 56 | {
|
|---|
| 57 | /* Dividing two non-negative numbers is the same as unsigned division. */
|
|---|
| 58 | if (i64B >= 0)
|
|---|
| 59 | i64Ret = (int64_t)__udivmoddi4((uint64_t)i64A, (uint64_t)i64B, (uint64_t *)pi64R);
|
|---|
| 60 | /* Dividing a non-negative number by a negative one yields a negative
|
|---|
| 61 | result and positive remainder. */
|
|---|
| 62 | else
|
|---|
| 63 | i64Ret = -(int64_t)__udivmoddi4((uint64_t)i64A, (uint64_t)-i64B, (uint64_t *)pi64R);
|
|---|
| 64 | }
|
|---|
| 65 | else
|
|---|
| 66 | {
|
|---|
| 67 | uint64_t u64R;
|
|---|
| 68 |
|
|---|
| 69 | /* Dividing a negative number by a non-negative one yields a negative
|
|---|
| 70 | result and negative remainder. */
|
|---|
| 71 | if (i64B >= 0)
|
|---|
| 72 | i64Ret = -(int64_t)__udivmoddi4((uint64_t)-i64A, (uint64_t)i64B, &u64R);
|
|---|
| 73 | /* Dividing two negative numbers yields a positive result and a
|
|---|
| 74 | negative remainder. */
|
|---|
| 75 | else
|
|---|
| 76 | i64Ret = (int64_t)__udivmoddi4((uint64_t)-i64A, (uint64_t)-i64B, &u64R);
|
|---|
| 77 |
|
|---|
| 78 | if (pi64R)
|
|---|
| 79 | *pi64R = -(int64_t)u64R;
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 | return i64Ret;
|
|---|
| 83 | }
|
|---|
| 84 |
|
|---|
