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59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/****************************************************************************
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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: verify Pentium processor divide bug
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*
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****************************************************************************/
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#include "variety.h"
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#include <rtinit.h>
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#include "rtdata.h"
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extern unsigned _WCNEAR __chipbug;
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enum {
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PROB_P5_DIV = 0x0001
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};
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_WCRTLINK void __verify_pentium_fdiv_bug()
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{
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/*
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Verify we have got the Pentium FDIV problem.
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The volatiles are to scare the optimizer away.
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*/
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volatile double num = 4195835;
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volatile double denom = 3145727;
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if( _RWD_real87 >= 3 ) {
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if( (num - (num/denom)*denom) > 1.0e-8 ) {
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__chipbug |= PROB_P5_DIV;
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}
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}
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}
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AXI( __verify_pentium_fdiv_bug, INIT_PRIORITY_FPU + 4 );
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