LXR linux/arch/mips/math-emu/ieee754dp.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 double precision sticky right shift */
  34#define XDPSRS(v,rs)    \
  35  ((rs > (DP_MBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
  36
  37#define XDPSRSX1() \
  38  (xe++, (xm = (xm >> 1) | (xm & 1)))
  39
  40#define XDPSRS1(v)      \
  41  (((v) >> 1) | ((v) & 1))
  42
  43/* convert denormal to normalized with extended exponent */
  44#define DPDNORMx(m,e) \
  45  while( (m >> DP_MBITS) == 0) { m <<= 1; e--; }
  46#define DPDNORMX        DPDNORMx(xm, xe)
  47#define DPDNORMY        DPDNORMx(ym, ye)
  48
  49static inline ieee754dp builddp(int s, int bx, u64 m)
  50{
  51        ieee754dp r;
  52
  53        assert((s) == 0 || (s) == 1);
  54        assert((bx) >= DP_EMIN - 1 + DP_EBIAS
  55               && (bx) <= DP_EMAX + 1 + DP_EBIAS);
  56        assert(((m) >> DP_MBITS) == 0);
  57
  58        r.parts.sign = s;
  59        r.parts.bexp = bx;
  60        r.parts.mant = m;
  61        return r;
  62}
  63
  64extern int ieee754dp_isnan(ieee754dp);
  65extern int ieee754dp_issnan(ieee754dp);
  66extern int ieee754si_xcpt(int, const char *, ...);
  67extern s64 ieee754di_xcpt(s64, const char *, ...);
  68extern ieee754dp ieee754dp_xcpt(ieee754dp, const char *, ...);
  69extern ieee754dp ieee754dp_nanxcpt(ieee754dp, const char *, ...);
  70extern ieee754dp ieee754dp_bestnan(ieee754dp, ieee754dp);
  71extern ieee754dp ieee754dp_format(int, int, u64);
  72
  73
  74#define DPNORMRET2(s, e, m, name, a0, a1) \
  75{ \
  76    ieee754dp V = ieee754dp_format(s, e, m); \
  77    if(TSTX()) \
  78      return ieee754dp_xcpt(V, name, a0, a1); \
  79    else \
  80      return V; \
  81}
  82
  83#define DPNORMRET1(s, e, m, name, a0)  DPNORMRET2(s, e, m, name, a0, a0)
  84