mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-24 07:36:48 +03:00
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/****************************************************************************
|
|
*
|
|
* Open Watcom Project
|
|
*
|
|
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* This file contains Original Code and/or Modifications of Original
|
|
* Code as defined in and that are subject to the Sybase Open Watcom
|
|
* Public License version 1.0 (the 'License'). You may not use this file
|
|
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
|
|
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
|
|
* provided with the Original Code and Modifications, and is also
|
|
* available at www.sybase.com/developer/opensource.
|
|
*
|
|
* The Original Code and all software distributed under the License are
|
|
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
|
|
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
|
|
* NON-INFRINGEMENT. Please see the License for the specific language
|
|
* governing rights and limitations under the License.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
|
|
* DESCRIBE IT HERE!
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
#include "variety.h"
|
|
#include <math.h>
|
|
#include <float.h>
|
|
#include "rtdata.h"
|
|
|
|
#if defined(__AXP__)
|
|
|
|
/*
|
|
* FPCR Trap Disable Flags
|
|
*/
|
|
#define FPCR_INEXACT 0x40000000
|
|
#define FPCR_UNDERFLOW 0x20000000
|
|
#define FPCR_OVERFLOW 0x00080000
|
|
#define FPCR_ZERODIVIDE 0x00040000
|
|
#define FPCR_INVALID 0x00020000
|
|
|
|
extern unsigned long _GetFPCR(void);
|
|
extern void _SetFPCR(unsigned long);
|
|
|
|
static unsigned int MapToCW(unsigned long fpcr)
|
|
{
|
|
unsigned int cw;
|
|
|
|
/*
|
|
* The rounding bits are identical but in the highword of the fpcr.
|
|
*/
|
|
cw = (fpcr >> 16) & ~(_MCW_RC);
|
|
|
|
if (fpcr & FPCR_INEXACT)
|
|
cw &= ~_EM_INEXACT;
|
|
|
|
if (fpcr & FPCR_ZERODIVIDE)
|
|
cw &= ~_EM_ZERODIVIDE;
|
|
|
|
if (fpcr & FPCR_OVERFLOW)
|
|
cw &= ~_EM_OVERFLOW;
|
|
|
|
if (fpcr & FPCR_UNDERFLOW)
|
|
cw &= ~_EM_UNDERFLOW;
|
|
|
|
if (fpcr & FPCR_INVALID)
|
|
cw &= ~_EM_INVALID;
|
|
|
|
return cw;
|
|
} /* MapToCW() */
|
|
|
|
|
|
static unsigned long MapFromCW(unsigned int cw)
|
|
{
|
|
unsigned long fpcr = 0L;
|
|
|
|
/*
|
|
* The rounding bits are identical but in the highword of the fpcr.
|
|
*/
|
|
fpcr = (cw & ~_MCW_RC) << 16;
|
|
|
|
if (!(cw & _EM_INEXACT))
|
|
fpcr |= FPCR_INEXACT;
|
|
|
|
if (!(cw & _EM_INVALID))
|
|
fpcr |= FPCR_INVALID;
|
|
|
|
if (!(cw & _EM_ZERODIVIDE))
|
|
fpcr |= FPCR_ZERODIVIDE;
|
|
|
|
if (!(cw & _EM_OVERFLOW))
|
|
fpcr |= FPCR_OVERFLOW;
|
|
|
|
if (!(cw & _EM_UNDERFLOW))
|
|
fpcr |= FPCR_UNDERFLOW;
|
|
|
|
return fpcr;
|
|
} /* MapFromCW() */
|
|
#endif
|
|
|
|
|
|
_WCRTLINK unsigned _controlfp(unsigned new, unsigned mask)
|
|
{
|
|
#if defined(_M_IX86)
|
|
return _control87(new, mask); /* JBS 99/09/16 */
|
|
#elif defined(__AXP__)
|
|
unsigned int cw;
|
|
|
|
cw = MapToCW(_GetFPCR());
|
|
|
|
if (mask)
|
|
{
|
|
cw = (cw & ~mask) | (new & mask);
|
|
_SetFPCR(MapFromCW(cw));
|
|
}
|
|
|
|
return cw;
|
|
#elif defined(__PPC__)
|
|
// No idea yet
|
|
return( 0 );
|
|
#elif defined(__MIPS__)
|
|
// No idea yet either
|
|
return( 0 );
|
|
#endif
|
|
} /* _controlfp() */
|