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