82 lines
3.4 KiB
NASM
82 lines
3.4 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!
|
||
|
|
;*
|
||
|
|
;*****************************************************************************
|
||
|
|
|
||
|
|
|
||
|
|
include mdef.inc
|
||
|
|
include struct.inc
|
||
|
|
|
||
|
|
.8087
|
||
|
|
modstart _7u8f386
|
||
|
|
|
||
|
|
xdefp __U8FD7
|
||
|
|
xdefp __U8FS7
|
||
|
|
|
||
|
|
;;;;two_to_64 dw 0000h, 0000h, 0000h, 43f0h ; removed by JBS
|
||
|
|
|
||
|
|
ULLMXP1:
|
||
|
|
DB 00H, 00H, 80H, 5FH ; (float)(ULONGLONG_MAX +1)
|
||
|
|
; (only exponent set)
|
||
|
|
|
||
|
|
defpe __U8FS7
|
||
|
|
push edx ; save unsigned int64 (hi)
|
||
|
|
push eax ; save unsigned int64 (lo)
|
||
|
|
fild qword ptr [esp] ; load as int64
|
||
|
|
test byte ptr 07H[esp],80H ; most significant bit set?
|
||
|
|
jns L$2 ; no, jump
|
||
|
|
fadd dword ptr cs:ULLMXP1 ; correct int64 to unsigned int64 as
|
||
|
|
; as float (because expression is exact
|
||
|
|
; in powers of 2, so save 4 bytes)
|
||
|
|
L$2:
|
||
|
|
pop eax ; correct stack
|
||
|
|
fstp dword ptr [esp] ; save float and pop coproc stack
|
||
|
|
pop eax ; return float in eax
|
||
|
|
ret
|
||
|
|
endproc __U8FS7
|
||
|
|
|
||
|
|
defpe __U8FD7
|
||
|
|
push edx ; save unsigned int64 (hi)
|
||
|
|
push eax ; save unsigned int64 (lo)
|
||
|
|
fild qword ptr [esp] ; load as int64
|
||
|
|
test byte ptr 07H[esp],80H ; most significant bit set?
|
||
|
|
jns L$3 ; no, jump
|
||
|
|
fadd dword ptr cs:ULLMXP1 ; correct int64 to unsigned int64 as
|
||
|
|
; as float (because expression is exact
|
||
|
|
; in powers of 2, so save 4 bytes)
|
||
|
|
L$3:
|
||
|
|
fstp qword ptr [esp] ; save double and pop coproc stack
|
||
|
|
pop eax ; return double (lo)
|
||
|
|
pop edx ; return double (hi)
|
||
|
|
ret
|
||
|
|
endproc __U8FD7
|
||
|
|
|
||
|
|
endmod
|
||
|
|
end
|