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