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; $Id$
;; @file
; IPRT - RTUInt128MulByU64 - AMD64 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
;
%define RT_ASM_WITH_SEH64
%include "iprt/asmdefs.mac"
%include "internal/bignum.mac"
BEGINCODE
;;
; Multiplies a 128-bit number with a 64-bit one, returning a 256-bit result.
;
; @returns puResult.
; @param puResult x86:[ebp + 8] gcc:rdi msc:rcx
; @param puValue1 x86:[ebp + 12] gcc:rsi msc:rdx
; @param uValue2 x86:[ebp + 16] gcc:rdx msc:r8
;
RT_BEGINPROC RTUInt128MulByU64Ex
; SEH64_SET_FRAME_xSP 0
SEH64_END_PROLOGUE
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_GCC
%define puResult rdi
%define puValue1 rsi
%define uValue2 r8
mov r8, rdx
%else
%define puResult rcx
%define puValue1 r9
%define uValue2 r8
mov r9, rdx
%endif
; puValue1->s.Lo * uValue2
mov rax, [puValue1]
mul uValue2
mov [puResult], rax ; Store the 1st 64-bit part of the result.
mov r11, rdx ; Save the upper 64 bits for later.
; puValue1->s.Hi * uValue2
mov rax, [puValue1 + 8]
mul uValue2
add r11, rax ; Calc the second half of the result.
adc rdx, 0
mov [puResult + 8], r11 ; Store the 2nd 64-bit part of the result.
mov [puResult + 16], rdx ; Store the 3rd 64-bit part of the result.
xor r10, r10
mov [puResult + 24], r10 ; Store the 4th 64-bit part of the result.
mov rax, puResult
;%elifdef RT_ARCH_X86
%else
%error "unsupported arch"
%endif
ret
ENDPROC RTUInt128MulByU64Ex
|
