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/* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats
Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include "gmp.h"
#include "mpfr.h"
/* functions to set/get the machine rounding mode,
this should use the interface from the ISO C9X draft
(file <fenv.h>) */
#ifdef IRIX64
#include <sys/fpu.h>
extern int swapRM();
#define TOZERO swapRM(ROUND_TO_ZERO)
#define TOINFP swapRM(ROUND_TO_PLUS_INFINITY)
#define TONEAREST swapRM(ROUND_TO_NEAREST)
#define TOINFM swapRM(ROUND_TO_MINUS_INFINITY)
#elif (defined (solaris) || defined (sun4) || defined(hpux))
#ifdef hpux
#include <math.h>
#else
#include <ieeefp.h>
#endif
#define TOZERO fpsetround(FP_RZ)
#define TOINFP fpsetround(FP_RP)
#define TONEAREST fpsetround(FP_RN)
#define TOINFM fpsetround(FP_RM)
#elif alpha
#ifdef __GNUC__
/* GCC patched include files forget to define those... */
#define FP_RND_RZ 0
#define FP_RND_RN 1
#define FP_RND_RP 2
#define FP_RND_RM 3
#endif
#include <float.h>
#define TOZERO write_rnd(FP_RND_RZ)
#define TOINFP write_rnd(FP_RND_RP)
#define TONEAREST write_rnd(FP_RND_RN)
#define TOINFM write_rnd(FP_RND_RM)
#elif AIX
#include <float.h>
#define TOZERO fp_swap_rnd(FP_RND_RZ)
#define TOINFP fp_swap_rnd(FP_RND_RP)
#define TONEAREST fp_swap_rnd(FP_RND_RN)
#define TOINFM fp_swap_rnd(FP_RND_RM)
#elif sunos
#include <floatingpoint.h>
char *out;
#define TOZERO ieee_flags("set","direction","tozero",&out)
#define TOINFP ieee_flags("set","direction","positive",&out)
#define TONEAREST ieee_flags("set","direction","nearest",&out)
#define TOINFM ieee_flags("set","direction","negative",&out)
#elif (defined (__i386__) || defined (__i486__) || defined (linux))
#include <fpu_control.h>
#ifdef LIBC211
#define __setfpucw(cw) __asm__ ("fldcw %0" : : "m" (cw))
#endif
/* be careful to put bits 9-8 (Precision control)
to 10 (round to double precision) instead of the
default 11 (round to extended precision) */
#define TOZERO __setfpucw(0x1e7f)
#define TOINFP __setfpucw(0x1a7f)
#define TOINFM __setfpucw(0x167f)
#define TONEAREST __setfpucw(0x127f)
#endif
/* sets the machine rounding mode to the value rnd_mode */
void
#if __STDC__
mpfr_set_machine_rnd_mode(unsigned char rnd_mode)
#else
mpfr_set_machine_rnd_mode(rnd_mode)
unsigned char rnd_mode;
#endif
{
switch (rnd_mode) {
case GMP_RNDN: TONEAREST; break;
case GMP_RNDZ: TOZERO; break;
case GMP_RNDU: TOINFP; break;
case GMP_RNDD: TOINFM; break;
default: fprintf(stderr,"invalid rounding mode\n"); exit(1);
}
}
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