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ieee754.c

/* ieee754 floating point arithmetic
 * single and double precision
 *
 * BUGS
 * not much dp done
 * doesn't generate IEEE754_INEXACT
 *
 */
/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 * http://www.algor.co.uk
 *
 * ########################################################################
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * ########################################################################
 */


#include "ieee754int.h"
#include "ieee754sp.h"
#include "ieee754dp.h"

#define DP_EBIAS  1023
#define DP_EMIN         (-1022)
#define DP_EMAX         1023

#define SP_EBIAS  127
#define SP_EMIN         (-126)
#define SP_EMAX         127

/* special constants
*/


#if (defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) || defined(__MIPSEL__)
#define SPSTR(s, b, m) {m, b, s}
#define DPSTR(s, b, mh, ml) {ml, mh, b, s}
#endif

#ifdef __MIPSEB__
#define SPSTR(s, b, m) {s, b, m}
#define DPSTR(s, b, mh, ml) {s, b, mh, ml}
#endif

const struct ieee754dp_konst __ieee754dp_spcvals[] = {
      DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 0),   /* + zero   */
      DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 0),   /* - zero   */
      DPSTR(0, DP_EBIAS, 0, 0),     /* + 1.0   */
      DPSTR(1, DP_EBIAS, 0, 0),     /* - 1.0   */
      DPSTR(0, 3 + DP_EBIAS, 0x40000, 0), /* + 10.0   */
      DPSTR(1, 3 + DP_EBIAS, 0x40000, 0), /* - 10.0   */
      DPSTR(0, DP_EMAX + 1 + DP_EBIAS, 0, 0),   /* + infinity */
      DPSTR(1, DP_EMAX + 1 + DP_EBIAS, 0, 0),   /* - infinity */
      DPSTR(0, DP_EMAX+1+DP_EBIAS, 0x7FFFF, 0xFFFFFFFF), /* + indef quiet Nan */
      DPSTR(0, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF),    /* + max */
      DPSTR(1, DP_EMAX + DP_EBIAS, 0xFFFFF, 0xFFFFFFFF),    /* - max */
      DPSTR(0, DP_EMIN + DP_EBIAS, 0, 0), /* + min normal */
      DPSTR(1, DP_EMIN + DP_EBIAS, 0, 0), /* - min normal */
      DPSTR(0, DP_EMIN - 1 + DP_EBIAS, 0, 1),   /* + min denormal */
      DPSTR(1, DP_EMIN - 1 + DP_EBIAS, 0, 1),   /* - min denormal */
      DPSTR(0, 31 + DP_EBIAS, 0, 0),      /* + 1.0e31 */
      DPSTR(0, 63 + DP_EBIAS, 0, 0),      /* + 1.0e63 */
};

const struct ieee754sp_konst __ieee754sp_spcvals[] = {
      SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 0),      /* + zero   */
      SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 0),      /* - zero   */
      SPSTR(0, SP_EBIAS, 0),  /* + 1.0   */
      SPSTR(1, SP_EBIAS, 0),  /* - 1.0   */
      SPSTR(0, 3 + SP_EBIAS, 0x200000),   /* + 10.0   */
      SPSTR(1, 3 + SP_EBIAS, 0x200000),   /* - 10.0   */
      SPSTR(0, SP_EMAX + 1 + SP_EBIAS, 0),      /* + infinity */
      SPSTR(1, SP_EMAX + 1 + SP_EBIAS, 0),      /* - infinity */
      SPSTR(0, SP_EMAX+1+SP_EBIAS, 0x3FFFFF),     /* + indef quiet Nan  */
      SPSTR(0, SP_EMAX + SP_EBIAS, 0x7FFFFF),   /* + max normal */
      SPSTR(1, SP_EMAX + SP_EBIAS, 0x7FFFFF),   /* - max normal */
      SPSTR(0, SP_EMIN + SP_EBIAS, 0),    /* + min normal */
      SPSTR(1, SP_EMIN + SP_EBIAS, 0),    /* - min normal */
      SPSTR(0, SP_EMIN - 1 + SP_EBIAS, 1),      /* + min denormal */
      SPSTR(1, SP_EMIN - 1 + SP_EBIAS, 1),      /* - min denormal */
      SPSTR(0, 31 + SP_EBIAS, 0),   /* + 1.0e31 */
      SPSTR(0, 63 + SP_EBIAS, 0),   /* + 1.0e63 */
};


int ieee754si_xcpt(int r, const char *op, ...)
{
      struct ieee754xctx ax;

      if (!TSTX())
            return r;
      ax.op = op;
      ax.rt = IEEE754_RT_SI;
      ax.rv.si = r;
      va_start(ax.ap, op);
      ieee754_xcpt(&ax);
      va_end(ax.ap);
      return ax.rv.si;
}

s64 ieee754di_xcpt(s64 r, const char *op, ...)
{
      struct ieee754xctx ax;

      if (!TSTX())
            return r;
      ax.op = op;
      ax.rt = IEEE754_RT_DI;
      ax.rv.di = r;
      va_start(ax.ap, op);
      ieee754_xcpt(&ax);
      va_end(ax.ap);
      return ax.rv.di;
}

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