| 1 | ; $Id: ASMMultU32ByU32DivByU32.asm 69111 2017-10-17 14:26:02Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - Assembly Functions, ASMMultU32ByU32DivByU32.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2017 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 | ;;
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| 31 | ; Multiple a 32-bit by a 32-bit integer and divide the result by a 32-bit integer
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| 32 | ; using a 64 bit intermediate result.
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| 33 | ;
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| 34 | ; @returns (u32A * u32B) / u32C.
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| 35 | ; @param u32A/ecx/edi The 32-bit value (A).
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| 36 | ; @param u32B/edx/esi The 32-bit value to multiple by A.
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| 37 | ; @param u32C/r8d/edx The 32-bit value to divide A*B by.
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| 38 | ;
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| 39 | ; @cproto DECLASM(uint32_t) ASMMultU32ByU32DivByU32(uint32_t u32A, uint32_t u32B, uint32_t u32C);
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| 40 | ;
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| 41 | BEGINPROC_EXPORTED ASMMultU32ByU32DivByU32
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| 42 | %ifdef RT_ARCH_AMD64
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| 43 | %ifdef ASM_CALL64_MSC
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| 44 | mov eax, ecx
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| 45 | mul edx
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| 46 | div r8d
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| 47 | %else
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| 48 | mov eax, edi
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| 49 | mov ecx, edx
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| 50 | mul esi
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| 51 | div ecx
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| 52 | %endif
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| 53 |
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| 54 | %elifdef RT_ARCH_X86
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| 55 | mov eax, [esp + 04h]
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| 56 | mul dword [esp + 08h]
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| 57 | div dword [esp + 0ch]
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| 58 | %else
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| 59 | %error "Unsupported arch."
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| 60 | unsupported arch
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| 61 | %endif
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| 62 |
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| 63 | ret
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| 64 | ENDPROC ASMMultU32ByU32DivByU32
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