|
Packit |
67cb25 |
/* ieee-utils/fp-gnux86.c
|
|
Packit |
67cb25 |
*
|
|
Packit |
67cb25 |
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
|
|
Packit |
67cb25 |
*
|
|
Packit |
67cb25 |
* This program is free software; you can redistribute it and/or modify
|
|
Packit |
67cb25 |
* it under the terms of the GNU General Public License as published by
|
|
Packit |
67cb25 |
* the Free Software Foundation; either version 3 of the License, or (at
|
|
Packit |
67cb25 |
* your option) any later version.
|
|
Packit |
67cb25 |
*
|
|
Packit |
67cb25 |
* This program is distributed in the hope that it will be useful, but
|
|
Packit |
67cb25 |
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
67cb25 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
67cb25 |
* General Public License for more details.
|
|
Packit |
67cb25 |
*
|
|
Packit |
67cb25 |
* You should have received a copy of the GNU General Public License
|
|
Packit |
67cb25 |
* along with this program; if not, write to the Free Software
|
|
Packit |
67cb25 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
Packit |
67cb25 |
*/
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
#include <stdio.h>
|
|
Packit |
67cb25 |
#include <fpu_control.h>
|
|
Packit |
67cb25 |
#include <gsl/gsl_errno.h>
|
|
Packit |
67cb25 |
#include <gsl/gsl_ieee_utils.h>
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
/* Handle libc5, where _FPU_SETCW is not available, suggested by
|
|
Packit |
67cb25 |
OKUJI Yoshinori <okuji@gnu.org> and Evgeny Stambulchik
|
|
Packit |
67cb25 |
<fnevgeny@plasma-gate.weizmann.ac.il> */
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
#ifndef _FPU_SETCW
|
|
Packit |
67cb25 |
#include <i386/fpu_control.h>
|
|
Packit |
67cb25 |
#define _FPU_SETCW(cw) __setfpucw(cw)
|
|
Packit |
67cb25 |
#endif
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
int
|
|
Packit |
67cb25 |
gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
|
|
Packit |
67cb25 |
{
|
|
Packit |
67cb25 |
unsigned short mode = 0 ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
switch (precision)
|
|
Packit |
67cb25 |
{
|
|
Packit |
67cb25 |
case GSL_IEEE_SINGLE_PRECISION:
|
|
Packit |
67cb25 |
mode |= _FPU_SINGLE ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
case GSL_IEEE_DOUBLE_PRECISION:
|
|
Packit |
67cb25 |
mode |= _FPU_DOUBLE ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
case GSL_IEEE_EXTENDED_PRECISION:
|
|
Packit |
67cb25 |
mode |= _FPU_EXTENDED ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
default:
|
|
Packit |
67cb25 |
mode |= _FPU_EXTENDED ;
|
|
Packit |
67cb25 |
}
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
switch (rounding)
|
|
Packit |
67cb25 |
{
|
|
Packit |
67cb25 |
case GSL_IEEE_ROUND_TO_NEAREST:
|
|
Packit |
67cb25 |
mode |= _FPU_RC_NEAREST ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
case GSL_IEEE_ROUND_DOWN:
|
|
Packit |
67cb25 |
mode |= _FPU_RC_DOWN ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
case GSL_IEEE_ROUND_UP:
|
|
Packit |
67cb25 |
mode |= _FPU_RC_UP ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
case GSL_IEEE_ROUND_TO_ZERO:
|
|
Packit |
67cb25 |
mode |= _FPU_RC_ZERO ;
|
|
Packit |
67cb25 |
break ;
|
|
Packit |
67cb25 |
default:
|
|
Packit |
67cb25 |
mode |= _FPU_RC_NEAREST ;
|
|
Packit |
67cb25 |
}
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
if (exception_mask & GSL_IEEE_MASK_INVALID)
|
|
Packit |
67cb25 |
mode |= _FPU_MASK_IM ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
|
|
Packit |
67cb25 |
mode |= _FPU_MASK_DM ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
|
|
Packit |
67cb25 |
mode |= _FPU_MASK_ZM ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
|
|
Packit |
67cb25 |
mode |= _FPU_MASK_OM ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
|
|
Packit |
67cb25 |
mode |= _FPU_MASK_UM ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
if (exception_mask & GSL_IEEE_TRAP_INEXACT)
|
|
Packit |
67cb25 |
{
|
|
Packit |
67cb25 |
mode &= ~ _FPU_MASK_PM ;
|
|
Packit |
67cb25 |
}
|
|
Packit |
67cb25 |
else
|
|
Packit |
67cb25 |
{
|
|
Packit |
67cb25 |
mode |= _FPU_MASK_PM ;
|
|
Packit |
67cb25 |
}
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
_FPU_SETCW(mode) ;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
#if HAVE_FPU_X86_SSE
|
|
Packit |
67cb25 |
#define _FPU_SETMXCSR(cw_sse) asm volatile ("ldmxcsr %0" : : "m" (*&cw_sse))
|
|
Packit |
67cb25 |
{
|
|
Packit |
67cb25 |
unsigned int mode_sse = 0;
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
mode_sse |= (mode & 0x3f)<<7; /* exception masks */
|
|
Packit |
67cb25 |
mode_sse |= (mode & 0xc00)<<3; /* rounding control */
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
_FPU_SETMXCSR(mode_sse);
|
|
Packit |
67cb25 |
}
|
|
Packit |
67cb25 |
#endif
|
|
Packit |
67cb25 |
|
|
Packit |
67cb25 |
return GSL_SUCCESS ;
|
|
Packit |
67cb25 |
}
|