linux/include/math-emu/double.h
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   1/* Software floating-point emulation.
   2   Definitions for IEEE Double Precision
   3   Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
   4   This file is part of the GNU C Library.
   5   Contributed by Richard Henderson (rth@cygnus.com),
   6                  Jakub Jelinek (jj@ultra.linux.cz),
   7                  David S. Miller (davem@redhat.com) and
   8                  Peter Maydell (pmaydell@chiark.greenend.org.uk).
   9
  10   The GNU C Library is free software; you can redistribute it and/or
  11   modify it under the terms of the GNU Library General Public License as
  12   published by the Free Software Foundation; either version 2 of the
  13   License, or (at your option) any later version.
  14
  15   The GNU C Library is distributed in the hope that it will be useful,
  16   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18   Library General Public License for more details.
  19
  20   You should have received a copy of the GNU Library General Public
  21   License along with the GNU C Library; see the file COPYING.LIB.  If
  22   not, write to the Free Software Foundation, Inc.,
  23   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25#ifndef    __MATH_EMU_DOUBLE_H__
  26#define    __MATH_EMU_DOUBLE_H__
  27
  28#if _FP_W_TYPE_SIZE < 32
  29#error "Here's a nickel kid.  Go buy yourself a real computer."
  30#endif
  31
  32#if _FP_W_TYPE_SIZE < 64
  33#define _FP_FRACTBITS_D         (2 * _FP_W_TYPE_SIZE)
  34#else
  35#define _FP_FRACTBITS_D         _FP_W_TYPE_SIZE
  36#endif
  37
  38#define _FP_FRACBITS_D          53
  39#define _FP_FRACXBITS_D         (_FP_FRACTBITS_D - _FP_FRACBITS_D)
  40#define _FP_WFRACBITS_D         (_FP_WORKBITS + _FP_FRACBITS_D)
  41#define _FP_WFRACXBITS_D        (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
  42#define _FP_EXPBITS_D           11
  43#define _FP_EXPBIAS_D           1023
  44#define _FP_EXPMAX_D            2047
  45
  46#define _FP_QNANBIT_D           \
  47        ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
  48#define _FP_IMPLBIT_D           \
  49        ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
  50#define _FP_OVERFLOW_D          \
  51        ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
  52
  53#if _FP_W_TYPE_SIZE < 64
  54
  55union _FP_UNION_D
  56{
  57  double flt;
  58  struct {
  59#if __BYTE_ORDER == __BIG_ENDIAN
  60    unsigned sign  : 1;
  61    unsigned exp   : _FP_EXPBITS_D;
  62    unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  63    unsigned frac0 : _FP_W_TYPE_SIZE;
  64#else
  65    unsigned frac0 : _FP_W_TYPE_SIZE;
  66    unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  67    unsigned exp   : _FP_EXPBITS_D;
  68    unsigned sign  : 1;
  69#endif
  70  } bits __attribute__((packed));
  71};
  72
  73#define FP_DECL_D(X)            _FP_DECL(2,X)
  74#define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  75#define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  76#define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  77#define FP_PACK_RAW_DP(val,X)           \
  78  do {                                  \
  79    if (!FP_INHIBIT_RESULTS)            \
  80      _FP_PACK_RAW_2_P(D,val,X);        \
  81  } while (0)
  82
  83#define FP_UNPACK_D(X,val)              \
  84  do {                                  \
  85    _FP_UNPACK_RAW_2(D,X,val);          \
  86    _FP_UNPACK_CANONICAL(D,2,X);        \
  87  } while (0)
  88
  89#define FP_UNPACK_DP(X,val)             \
  90  do {                                  \
  91    _FP_UNPACK_RAW_2_P(D,X,val);        \
  92    _FP_UNPACK_CANONICAL(D,2,X);        \
  93  } while (0)
  94
  95#define FP_PACK_D(val,X)                \
  96  do {                                  \
  97    _FP_PACK_CANONICAL(D,2,X);          \
  98    _FP_PACK_RAW_2(D,val,X);            \
  99  } while (0)
 100
 101#define FP_PACK_DP(val,X)               \
 102  do {                                  \
 103    _FP_PACK_CANONICAL(D,2,X);          \
 104    if (!FP_INHIBIT_RESULTS)            \
 105      _FP_PACK_RAW_2_P(D,val,X);        \
 106  } while (0)
 107
 108#define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 109#define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 110#define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 111#define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 112#define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 113#define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 114#define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 115#define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 116
 117#define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 118#define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 119
 120#define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 121#define FP_TO_INT_ROUND_D(r,X,rsz,rsg)  _FP_TO_INT_ROUND(D,2,r,X,rsz,rsg)
 122#define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 123
 124#define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 125#define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 126
 127#else
 128
 129union _FP_UNION_D
 130{
 131  double flt;
 132  struct {
 133#if __BYTE_ORDER == __BIG_ENDIAN
 134    unsigned sign : 1;
 135    unsigned exp  : _FP_EXPBITS_D;
 136    unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 137#else
 138    unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 139    unsigned exp  : _FP_EXPBITS_D;
 140    unsigned sign : 1;
 141#endif
 142  } bits __attribute__((packed));
 143};
 144
 145#define FP_DECL_D(X)            _FP_DECL(1,X)
 146#define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 147#define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 148#define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 149#define FP_PACK_RAW_DP(val,X)           \
 150  do {                                  \
 151    if (!FP_INHIBIT_RESULTS)            \
 152      _FP_PACK_RAW_1_P(D,val,X);        \
 153  } while (0)
 154
 155#define FP_UNPACK_D(X,val)              \
 156  do {                                  \
 157    _FP_UNPACK_RAW_1(D,X,val);          \
 158    _FP_UNPACK_CANONICAL(D,1,X);        \
 159  } while (0)
 160
 161#define FP_UNPACK_DP(X,val)             \
 162  do {                                  \
 163    _FP_UNPACK_RAW_1_P(D,X,val);        \
 164    _FP_UNPACK_CANONICAL(D,1,X);        \
 165  } while (0)
 166
 167#define FP_PACK_D(val,X)                \
 168  do {                                  \
 169    _FP_PACK_CANONICAL(D,1,X);          \
 170    _FP_PACK_RAW_1(D,val,X);            \
 171  } while (0)
 172
 173#define FP_PACK_DP(val,X)               \
 174  do {                                  \
 175    _FP_PACK_CANONICAL(D,1,X);          \
 176    if (!FP_INHIBIT_RESULTS)            \
 177      _FP_PACK_RAW_1_P(D,val,X);        \
 178  } while (0)
 179
 180#define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 181#define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 182#define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 183#define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 184#define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 185#define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 186#define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 187#define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 188
 189/* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 190   the target machine.  */
 191
 192#define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 193#define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 194
 195#define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 196#define FP_TO_INT_ROUND_D(r,X,rsz,rsg)  _FP_TO_INT_ROUND(D,1,r,X,rsz,rsg)
 197#define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 198
 199#define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 200#define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 201
 202#endif /* W_TYPE_SIZE < 64 */
 203
 204
 205#endif /* __MATH_EMU_DOUBLE_H__ */
 206
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