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72 lines
3.1 KiB
NASM
72 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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;<>
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;<> __FSC compares EAX with EDX
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;<> if EAX > EDX, 1 is returned in EAX
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;<> if EAX = EDX, 0 is returned in EAX
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;<> if EAX < EDX, -1 is returned in EAX
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;<>
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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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modstart fsc386
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xdefp __FSC
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defpe __FSC
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_guess have_cmp ; guess - comparison done
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xor EAX,EDX ; - check if signs differ
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_if ns ; - if signs are the same
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xor EAX,EDX ; - - restore EAX
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sub EAX,EDX ; - - find difference, EAX=0 if equal
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_quif e,have_cmp ; - - done if mantissas also equal
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; - - carry=1 iff |EAX| < |EDX|
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rcr EAX,1 ; - - EAX sign set iff |EAX| < |EDX|
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xor EDX,EAX ; - - EDX sign set iff EAX < EDX
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not EDX ; - - EDX sign set iff EAX > EDX
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_endif ; - endif
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sub EAX,EAX ; - clear result
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_shl EDX,1 ; - carry=1 iff EAX > EDX
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adc EAX,EAX ; - EAX = 1 iff EAX > EDX, else EAX = 0
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_shl EAX,1 ; - EAX = 2 iff EAX > EDX, else EAX = 0
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dec EAX ; - EAX = 1 iff EAX > EDX, else EAX = -1
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_endguess ; endguess
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ret ; return with sign in EAX, conditions set
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endproc __FSC
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endmod
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end
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