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