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https://github.com/KolibriOS/kolibrios.git
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76 lines
3.1 KiB
NASM
76 lines
3.1 KiB
NASM
;*****************************************************************************
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;*
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;* Open Watcom Project
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;*
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;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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;*
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;* ========================================================================
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;*
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;* This file contains Original Code and/or Modifications of Original
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;* Code as defined in and that are subject to the Sybase Open Watcom
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;* Public License version 1.0 (the 'License'). You may not use this file
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;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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;* provided with the Original Code and Modifications, and is also
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;* available at www.sybase.com/developer/opensource.
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;*
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;* The Original Code and all software distributed under the License are
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;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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;* NON-INFRINGEMENT. Please see the License for the specific language
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;* governing rights and limitations under the License.
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;*
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;* ========================================================================
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;*
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;* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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;* DESCRIBE IT HERE!
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;*
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;*****************************************************************************
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;========================================================================
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;== Name: I8M,U8M ==
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;== Operation: integer eight byte multiply ==
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;== Inputs: EDX;EAX integer M1 ==
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;== ECX;EBX integer M2 ==
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;== Outputs: EDX;EAX product ==
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;== Volatile: ECX, EBX destroyed ==
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;========================================================================
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include mdef.inc
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include struct.inc
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modstart i8m
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xdefp __I8M
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xdefp __U8M
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defpe __I8M
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defpe __U8M
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test edx,edx ; first check for easy (hiwords == 0) case
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jnz L1
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test ecx,ecx
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jnz L1
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mul ebx
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ret
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L1: push eax ; save M1.l
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push edx ; save M1.h
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mul ecx ; calc M1.l * M2.h -> eax
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mov ecx,eax ; save M1.l * M2.h in ecx
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pop eax ; get M1.h in eax
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mul ebx ; calc M1.h * M2.l -> eax
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add ecx,eax ; add above to previous total
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pop eax ; get M1.l in eax
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mul ebx ; calc M1.l * M2.l -> edx:eax
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add edx,ecx ; add previous hiword contribs to hiword
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ret ; and return!!!
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endproc __U8M
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endproc __I8M
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endmod
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end
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