133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
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/****************************************************************************
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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 "variety.h"
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#include <math.h>
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#include <float.h>
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#include "rtdata.h"
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#if defined(__AXP__)
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/*
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* FPCR Trap Disable Flags
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*/
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#define FPCR_INEXACT 0x40000000
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#define FPCR_UNDERFLOW 0x20000000
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#define FPCR_OVERFLOW 0x00080000
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#define FPCR_ZERODIVIDE 0x00040000
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#define FPCR_INVALID 0x00020000
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extern unsigned long _GetFPCR(void);
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extern void _SetFPCR(unsigned long);
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static unsigned int MapToCW(unsigned long fpcr)
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{
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unsigned int cw;
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/*
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* The rounding bits are identical but in the highword of the fpcr.
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*/
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cw = (fpcr >> 16) & ~(_MCW_RC);
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if (fpcr & FPCR_INEXACT)
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cw &= ~_EM_INEXACT;
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if (fpcr & FPCR_ZERODIVIDE)
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cw &= ~_EM_ZERODIVIDE;
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if (fpcr & FPCR_OVERFLOW)
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cw &= ~_EM_OVERFLOW;
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if (fpcr & FPCR_UNDERFLOW)
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cw &= ~_EM_UNDERFLOW;
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if (fpcr & FPCR_INVALID)
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cw &= ~_EM_INVALID;
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return cw;
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} /* MapToCW() */
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static unsigned long MapFromCW(unsigned int cw)
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{
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unsigned long fpcr = 0L;
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/*
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* The rounding bits are identical but in the highword of the fpcr.
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*/
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fpcr = (cw & ~_MCW_RC) << 16;
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if (!(cw & _EM_INEXACT))
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fpcr |= FPCR_INEXACT;
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if (!(cw & _EM_INVALID))
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fpcr |= FPCR_INVALID;
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if (!(cw & _EM_ZERODIVIDE))
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fpcr |= FPCR_ZERODIVIDE;
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if (!(cw & _EM_OVERFLOW))
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fpcr |= FPCR_OVERFLOW;
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if (!(cw & _EM_UNDERFLOW))
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fpcr |= FPCR_UNDERFLOW;
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return fpcr;
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} /* MapFromCW() */
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#endif
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_WCRTLINK unsigned _controlfp(unsigned new, unsigned mask)
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{
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#if defined(_M_IX86)
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return _control87(new, mask); /* JBS 99/09/16 */
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#elif defined(__AXP__)
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unsigned int cw;
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cw = MapToCW(_GetFPCR());
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if (mask)
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{
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cw = (cw & ~mask) | (new & mask);
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_SetFPCR(MapFromCW(cw));
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}
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return cw;
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#elif defined(__PPC__)
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// No idea yet
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return( 0 );
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#elif defined(__MIPS__)
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// No idea yet either
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return( 0 );
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#endif
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} /* _controlfp() */
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