| 1 | ; $Id: I8D-x86-32.asm 75129 2018-10-28 17:00:27Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - 32-bit Watcom C/C++, 64-bit signed integer division.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2017 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | %include "iprt/asmdefs.mac"
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| 28 |
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| 29 |
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| 30 | BEGINCODE
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| 31 |
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| 32 | extern __U8D
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| 33 |
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| 34 |
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| 35 | ;;
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| 36 | ; 64-bit signed integer division.
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| 37 | ;
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| 38 | ; @returns EDX:EAX Quotient, ECX:EBX Remainder.
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| 39 | ; @param EDX:EAX Dividend.
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| 40 | ; @param ECX:EBX Divisor
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| 41 | ;
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| 42 | global __I8D
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| 43 | __I8D:
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| 44 | ;
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| 45 | ; We use __U8D to do the work, we take care of the signedness.
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| 46 | ;
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| 47 | or edx, edx
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| 48 | js .negative_dividend
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| 49 |
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| 50 | or ecx, ecx
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| 51 | js .negative_divisor_positive_dividend
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| 52 | jmp __U8D
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| 53 |
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| 54 |
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| 55 | .negative_divisor_positive_dividend:
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| 56 | ; negate the divisor, do unsigned division, and negate the quotient.
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| 57 | neg ecx
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| 58 | neg ebx
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| 59 | sbb ecx, 0
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| 60 |
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| 61 | call __U8D
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| 62 |
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| 63 | neg edx
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| 64 | neg eax
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| 65 | sbb edx, 0
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| 66 | ret
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| 67 |
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| 68 | .negative_dividend:
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| 69 | neg edx
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| 70 | neg eax
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| 71 | sbb edx, 0
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| 72 |
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| 73 | or ecx, ecx
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| 74 | js .negative_dividend_negative_divisor
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| 75 |
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| 76 | .negative_dividend_positive_divisor:
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| 77 | ; negate the dividend (above), do unsigned division, and negate both quotient and remainder
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| 78 | call __U8D
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| 79 |
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| 80 | neg edx
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| 81 | neg eax
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| 82 | sbb edx, 0
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| 83 |
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| 84 | .return_negated_remainder:
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| 85 | neg ecx
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| 86 | neg ebx
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| 87 | sbb ecx, 0
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| 88 | ret
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| 89 |
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| 90 | .negative_dividend_negative_divisor:
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| 91 | ; negate both dividend (above) and divisor, do unsigned division, and negate the remainder.
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| 92 | neg ecx
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| 93 | neg ebx
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| 94 | sbb ecx, 0
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| 95 |
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| 96 | call __U8D
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| 97 | jmp .return_negated_remainder
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| 98 |
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