LXR linux/arch/mips/math-emu/ieee754sp.h

   1/*
   2 * IEEE754 floating point
   3 * double precision internal header file
   4 */
   5/*
   6 * MIPS floating point support
   7 * Copyright (C) 1994-2000 Algorithmics Ltd.
   8 * http://www.algor.co.uk
   9 *
  10 * ########################################################################
  11 *
  12 *  This program is free software; you can distribute it and/or modify it
  13 *  under the terms of the GNU General Public License (Version 2) as
  14 *  published by the Free Software Foundation.
  15 *
  16 *  This program is distributed in the hope it will be useful, but WITHOUT
  17 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19 *  for more details.
  20 *
  21 *  You should have received a copy of the GNU General Public License along
  22 *  with this program; if not, write to the Free Software Foundation, Inc.,
  23 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  24 *
  25 * ########################################################################
  26 */
  27
  28
  29#include "ieee754int.h"
  30
  31#define assert(expr) ((void)0)
  32
  33/* 3bit extended single precision sticky right shift */
  34#define SPXSRSXn(rs) \
  35  (xe += rs, \
  36   xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
  37
  38#define SPXSRSX1() \
  39  (xe++, (xm = (xm >> 1) | (xm & 1)))
  40
  41#define SPXSRSYn(rs) \
  42   (ye+=rs, \
  43    ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
  44
  45#define SPXSRSY1() \
  46   (ye++, (ym = (ym >> 1) | (ym & 1)))
  47
  48/* convert denormal to normalized with extended exponent */
  49#define SPDNORMx(m,e) \
  50  while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
  51#define SPDNORMX        SPDNORMx(xm, xe)
  52#define SPDNORMY        SPDNORMx(ym, ye)
  53
  54static inline ieee754sp buildsp(int s, int bx, unsigned m)
  55{
  56        ieee754sp r;
  57
  58        assert((s) == 0 || (s) == 1);
  59        assert((bx) >= SP_EMIN - 1 + SP_EBIAS
  60               && (bx) <= SP_EMAX + 1 + SP_EBIAS);
  61        assert(((m) >> SP_MBITS) == 0);
  62
  63        r.parts.sign = s;
  64        r.parts.bexp = bx;
  65        r.parts.mant = m;
  66
  67        return r;
  68}
  69
  70extern int ieee754sp_isnan(ieee754sp);
  71extern int ieee754sp_issnan(ieee754sp);
  72extern int ieee754si_xcpt(int, const char *, ...);
  73extern s64 ieee754di_xcpt(s64, const char *, ...);
  74extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
  75extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
  76extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
  77extern ieee754sp ieee754sp_format(int, int, unsigned);
  78
  79
  80#define SPNORMRET2(s, e, m, name, a0, a1) \
  81{ \
  82    ieee754sp V = ieee754sp_format(s, e, m); \
  83    if(TSTX()) \
  84      return ieee754sp_xcpt(V, name, a0, a1); \
  85    else \
  86      return V; \
  87}
  88
  89#define SPNORMRET1(s, e, m, name, a0)  SPNORMRET2(s, e, m, name, a0, a0)
  90