| 1 | ; $Id: RTUInt128MulByU64.asm 93115 2022-01-01 11:31:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - RTUInt128MulByU64 - AMD64 implementation.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2022 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 |
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| 28 | %define RT_ASM_WITH_SEH64
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| 29 | %include "iprt/asmdefs.mac"
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| 30 | %include "internal/bignum.mac"
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| 31 |
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| 32 |
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| 33 | BEGINCODE
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| 34 |
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| 35 | ;;
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| 36 | ; Multiplies a 128-bit number with a 64-bit one.
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| 37 | ;
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| 38 | ; @returns puResult.
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| 39 | ; @param puResult x86:[ebp + 8] gcc:rdi msc:rcx
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| 40 | ; @param puValue1 x86:[ebp + 12] gcc:rsi msc:rdx
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| 41 | ; @param uValue2 x86:[ebp + 16] gcc:rdx msc:r8
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| 42 | ;
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| 43 | RT_BEGINPROC RTUInt128MulByU64
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| 44 | ; SEH64_SET_FRAME_xSP 0
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| 45 | SEH64_END_PROLOGUE
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| 46 |
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| 47 | %ifdef RT_ARCH_AMD64
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| 48 | %ifdef ASM_CALL64_GCC
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| 49 | %define puResult rdi
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| 50 | %define puValue1 rsi
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| 51 | %define uValue2 r8
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| 52 | mov r8, rdx
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| 53 | %else
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| 54 | %define puResult rcx
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| 55 | %define puValue1 r9
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| 56 | %define uValue2 r8
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| 57 | mov r9, rdx
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| 58 | %endif
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| 59 |
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| 60 | ; puValue1->s.Lo * uValue2
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| 61 | mov rax, [puValue1]
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| 62 | mul uValue2
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| 63 | mov [puResult], rax
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| 64 | mov r11, rdx ; Store the lower half of the result.
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| 65 |
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| 66 | ; puValue1->s.Hi * uValue2
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| 67 | mov rax, [puValue1 + 8]
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| 68 | mul uValue2
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| 69 | add r11, rax ; Calc the second half of the result.
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| 70 | mov [puResult + 8], r11 ; Store the high half of the result.
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| 71 |
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| 72 | mov rax, puResult
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| 73 |
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| 74 | ;%elifdef RT_ARCH_X86
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| 75 | %else
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| 76 | %error "unsupported arch"
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| 77 | %endif
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| 78 |
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| 79 | ret
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| 80 | ENDPROC RTUInt128MulByU64
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| 81 |
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