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| Rev | Author | Line No. | Line |
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| 359 | serge | 1 | /**************************************************************************** |
| 2 | * |
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| 3 | * Open Watcom Project |
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| 4 | * |
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| 5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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| 6 | * |
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| 7 | * ======================================================================== |
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| 8 | * |
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| 9 | * This file contains Original Code and/or Modifications of Original |
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| 10 | * Code as defined in and that are subject to the Sybase Open Watcom |
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| 11 | * Public License version 1.0 (the 'License'). You may not use this file |
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| 12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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| 13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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| 14 | * provided with the Original Code and Modifications, and is also |
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| 15 | * available at www.sybase.com/developer/opensource. |
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| 16 | * |
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| 17 | * The Original Code and all software distributed under the License are |
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| 18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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| 19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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| 20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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| 21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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| 22 | * NON-INFRINGEMENT. Please see the License for the specific language |
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| 23 | * governing rights and limitations under the License. |
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| 24 | * |
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| 25 | * ======================================================================== |
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| 26 | * |
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| 27 | * Description: verify Pentium processor divide bug |
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| 28 | * |
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| 29 | ****************************************************************************/ |
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| 30 | |||
| 31 | |||
| 32 | #include "variety.h" |
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| 33 | #include "rtinit.h" |
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| 34 | #include "rtdata.h" |
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| 35 | |||
| 36 | extern unsigned _WCNEAR __chipbug; |
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| 37 | |||
| 38 | enum { |
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| 39 | PROB_P5_DIV = 0x0001 |
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| 40 | }; |
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| 41 | |||
| 42 | _WCRTLINK void __verify_pentium_fdiv_bug() |
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| 43 | { |
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| 44 | /* |
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| 45 | Verify we have got the Pentium FDIV problem. |
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| 46 | The volatiles are to scare the optimizer away. |
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| 47 | */ |
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| 48 | volatile double num = 4195835; |
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| 49 | volatile double denom = 3145727; |
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| 50 | |||
| 51 | if( _RWD_real87 >= 3 ) { |
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| 52 | if( (num - (num/denom)*denom) > 1.0e-8 ) { |
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| 53 | __chipbug |= PROB_P5_DIV; |
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| 54 | } |
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| 55 | } |
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| 56 | } |
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| 57 | |||
| 58 | AXI( __verify_pentium_fdiv_bug, INIT_PRIORITY_FPU + 4 ); |