soft-fp/double.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Double Precision
   3    Copyright (C) 1997-2014 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 Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 2.1 of the License, or (at your option) any later version.
  14
  15    In addition to the permissions in the GNU Lesser General Public
  16    License, the Free Software Foundation gives you unlimited
  17    permission to link the compiled version of this file into
  18    combinations with other programs, and to distribute those
  19    combinations without any restriction coming from the use of this
  20    file.  (The Lesser General Public License restrictions do apply in
  21    other respects; for example, they cover modification of the file,
  22    and distribution when not linked into a combine executable.)
  23
  24    The GNU C Library is distributed in the hope that it will be useful,
  25    but WITHOUT ANY WARRANTY; without even the implied warranty of
  26    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  27    Lesser General Public License for more details.
  28
  29    You should have received a copy of the GNU Lesser General Public
  30    License along with the GNU C Library; if not, see
  31    <http://www.gnu.org/licenses/>.  */
  32
  33 #if _FP_W_TYPE_SIZE < 32
  34 # error "Here's a nickel kid.  Go buy yourself a real computer."
  35 #endif
  36
  37 #if _FP_W_TYPE_SIZE < 64
  38 # define _FP_FRACTBITS_D        (2 * _FP_W_TYPE_SIZE)
  39 # define _FP_FRACTBITS_DW_D     (4 * _FP_W_TYPE_SIZE)
  40 #else
  41 # define _FP_FRACTBITS_D        _FP_W_TYPE_SIZE
  42 # define _FP_FRACTBITS_DW_D     (2 * _FP_W_TYPE_SIZE)
  43 #endif
  44
  45 #define _FP_FRACBITS_D          53
  46 #define _FP_FRACXBITS_D         (_FP_FRACTBITS_D - _FP_FRACBITS_D)
  47 #define _FP_WFRACBITS_D         (_FP_WORKBITS + _FP_FRACBITS_D)
  48 #define _FP_WFRACXBITS_D        (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
  49 #define _FP_EXPBITS_D           11
  50 #define _FP_EXPBIAS_D           1023
  51 #define _FP_EXPMAX_D            2047
  52
  53 #define _FP_QNANBIT_D           \
  54         ((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
  55 #define _FP_QNANBIT_SH_D                \
  56         ((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
  57 #define _FP_IMPLBIT_D           \
  58         ((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
  59 #define _FP_IMPLBIT_SH_D                \
  60         ((_FP_W_TYPE) 1 << (_FP_FRACBITS_D-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
  61 #define _FP_OVERFLOW_D          \
  62         ((_FP_W_TYPE) 1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
  63
  64 #define _FP_WFRACBITS_DW_D      (2 * _FP_WFRACBITS_D)
  65 #define _FP_WFRACXBITS_DW_D     (_FP_FRACTBITS_DW_D - _FP_WFRACBITS_DW_D)
  66 #define _FP_HIGHBIT_DW_D        \
  67   ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_D - 1) % _FP_W_TYPE_SIZE)
  68
  69 typedef float DFtype __attribute__ ((mode (DF)));
  70
  71 #if _FP_W_TYPE_SIZE < 64
  72
  73 union _FP_UNION_D
  74 {
  75   DFtype flt;
  76   struct _FP_STRUCT_LAYOUT
  77   {
  78 # if __BYTE_ORDER == __BIG_ENDIAN
  79     unsigned sign  : 1;
  80     unsigned exp   : _FP_EXPBITS_D;
  81     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  82     unsigned frac0 : _FP_W_TYPE_SIZE;
  83 # else
  84     unsigned frac0 : _FP_W_TYPE_SIZE;
  85     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  86     unsigned exp   : _FP_EXPBITS_D;
  87     unsigned sign  : 1;
  88 # endif
  89   } bits __attribute__ ((packed));
  90 };
  91
  92 # define FP_DECL_D(X)           _FP_DECL (2, X)
  93 # define FP_UNPACK_RAW_D(X, val)        _FP_UNPACK_RAW_2 (D, X, val)
  94 # define FP_UNPACK_RAW_DP(X, val)       _FP_UNPACK_RAW_2_P (D, X, val)
  95 # define FP_PACK_RAW_D(val, X)  _FP_PACK_RAW_2 (D, val, X)
  96 # define FP_PACK_RAW_DP(val, X)                 \
  97   do                                            \
  98     {                                           \
  99       if (!FP_INHIBIT_RESULTS)                  \
 100         _FP_PACK_RAW_2_P (D, val, X);           \
 101     }                                           \
 102   while (0)
 103
 104 # define FP_UNPACK_D(X, val)                    \
 105   do                                            \
 106     {                                           \
 107       _FP_UNPACK_RAW_2 (D, X, val);             \
 108       _FP_UNPACK_CANONICAL (D, 2, X);           \
 109     }                                           \
 110   while (0)
 111
 112 # define FP_UNPACK_DP(X, val)                   \
 113   do                                            \
 114     {                                           \
 115       _FP_UNPACK_RAW_2_P (D, X, val);           \
 116       _FP_UNPACK_CANONICAL (D, 2, X);           \
 117     }                                           \
 118   while (0)
 119
 120 # define FP_UNPACK_SEMIRAW_D(X, val)            \
 121   do                                            \
 122     {                                           \
 123       _FP_UNPACK_RAW_2 (D, X, val);             \
 124       _FP_UNPACK_SEMIRAW (D, 2, X);             \
 125     }                                           \
 126   while (0)
 127
 128 # define FP_UNPACK_SEMIRAW_DP(X, val)           \
 129   do                                            \
 130     {                                           \
 131       _FP_UNPACK_RAW_2_P (D, X, val);           \
 132       _FP_UNPACK_SEMIRAW (D, 2, X);             \
 133     }                                           \
 134   while (0)
 135
 136 # define FP_PACK_D(val, X)                      \
 137   do                                            \
 138     {                                           \
 139       _FP_PACK_CANONICAL (D, 2, X);             \
 140       _FP_PACK_RAW_2 (D, val, X);               \
 141     }                                           \
 142   while (0)
 143
 144 # define FP_PACK_DP(val, X)                     \
 145   do                                            \
 146     {                                           \
 147       _FP_PACK_CANONICAL (D, 2, X);             \
 148       if (!FP_INHIBIT_RESULTS)                  \
 149         _FP_PACK_RAW_2_P (D, val, X);           \
 150     }                                           \
 151   while (0)
 152
 153 # define FP_PACK_SEMIRAW_D(val, X)              \
 154   do                                            \
 155     {                                           \
 156       _FP_PACK_SEMIRAW (D, 2, X);               \
 157       _FP_PACK_RAW_2 (D, val, X);               \
 158     }                                           \
 159   while (0)
 160
 161 # define FP_PACK_SEMIRAW_DP(val, X)             \
 162   do                                            \
 163     {                                           \
 164       _FP_PACK_SEMIRAW (D, 2, X);               \
 165       if (!FP_INHIBIT_RESULTS)                  \
 166         _FP_PACK_RAW_2_P (D, val, X);           \
 167     }                                           \
 168   while (0)
 169
 170 # define FP_ISSIGNAN_D(X)               _FP_ISSIGNAN (D, 2, X)
 171 # define FP_NEG_D(R, X)                 _FP_NEG (D, 2, R, X)
 172 # define FP_ADD_D(R, X, Y)              _FP_ADD (D, 2, R, X, Y)
 173 # define FP_SUB_D(R, X, Y)              _FP_SUB (D, 2, R, X, Y)
 174 # define FP_MUL_D(R, X, Y)              _FP_MUL (D, 2, R, X, Y)
 175 # define FP_DIV_D(R, X, Y)              _FP_DIV (D, 2, R, X, Y)
 176 # define FP_SQRT_D(R, X)                _FP_SQRT (D, 2, R, X)
 177 # define _FP_SQRT_MEAT_D(R, S, T, X, Q) _FP_SQRT_MEAT_2 (R, S, T, X, Q)
 178 # define FP_FMA_D(R, X, Y, Z)           _FP_FMA (D, 2, 4, R, X, Y, Z)
 179
 180 # define FP_CMP_D(r, X, Y, un)          _FP_CMP (D, 2, r, X, Y, un)
 181 # define FP_CMP_EQ_D(r, X, Y)           _FP_CMP_EQ (D, 2, r, X, Y)
 182 # define FP_CMP_UNORD_D(r, X, Y)        _FP_CMP_UNORD (D, 2, r, X, Y)
 183
 184 # define FP_TO_INT_D(r, X, rsz, rsg)    _FP_TO_INT (D, 2, r, X, rsz, rsg)
 185 # define FP_FROM_INT_D(X, r, rs, rt)    _FP_FROM_INT (D, 2, X, r, rs, rt)
 186
 187 # define _FP_FRAC_HIGH_D(X)     _FP_FRAC_HIGH_2 (X)
 188 # define _FP_FRAC_HIGH_RAW_D(X) _FP_FRAC_HIGH_2 (X)
 189
 190 # define _FP_FRAC_HIGH_DW_D(X)  _FP_FRAC_HIGH_4 (X)
 191
 192 #else
 193
 194 union _FP_UNION_D
 195 {
 196   DFtype flt;
 197   struct _FP_STRUCT_LAYOUT
 198   {
 199 # if __BYTE_ORDER == __BIG_ENDIAN
 200     unsigned sign   : 1;
 201     unsigned exp    : _FP_EXPBITS_D;
 202     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 203 # else
 204     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 205     unsigned exp    : _FP_EXPBITS_D;
 206     unsigned sign   : 1;
 207 # endif
 208   } bits __attribute__ ((packed));
 209 };
 210
 211 # define FP_DECL_D(X)           _FP_DECL (1, X)
 212 # define FP_UNPACK_RAW_D(X, val)        _FP_UNPACK_RAW_1 (D, X, val)
 213 # define FP_UNPACK_RAW_DP(X, val)       _FP_UNPACK_RAW_1_P (D, X, val)
 214 # define FP_PACK_RAW_D(val, X)  _FP_PACK_RAW_1 (D, val, X)
 215 # define FP_PACK_RAW_DP(val, X)                 \
 216   do                                            \
 217     {                                           \
 218       if (!FP_INHIBIT_RESULTS)                  \
 219         _FP_PACK_RAW_1_P (D, val, X);           \
 220     }                                           \
 221   while (0)
 222
 223 # define FP_UNPACK_D(X, val)                    \
 224   do                                            \
 225     {                                           \
 226       _FP_UNPACK_RAW_1 (D, X, val);             \
 227       _FP_UNPACK_CANONICAL (D, 1, X);           \
 228     }                                           \
 229   while (0)
 230
 231 # define FP_UNPACK_DP(X, val)                   \
 232   do                                            \
 233     {                                           \
 234       _FP_UNPACK_RAW_1_P (D, X, val);           \
 235       _FP_UNPACK_CANONICAL (D, 1, X);           \
 236     }                                           \
 237   while (0)
 238
 239 # define FP_UNPACK_SEMIRAW_D(X, val)            \
 240   do                                            \
 241     {                                           \
 242       _FP_UNPACK_RAW_1 (D, X, val);             \
 243       _FP_UNPACK_SEMIRAW (D, 1, X);             \
 244     }                                           \
 245   while (0)
 246
 247 # define FP_UNPACK_SEMIRAW_DP(X, val)           \
 248   do                                            \
 249     {                                           \
 250       _FP_UNPACK_RAW_1_P (D, X, val);           \
 251       _FP_UNPACK_SEMIRAW (D, 1, X);             \
 252     }                                           \
 253   while (0)
 254
 255 # define FP_PACK_D(val, X)                      \
 256   do                                            \
 257     {                                           \
 258       _FP_PACK_CANONICAL (D, 1, X);             \
 259       _FP_PACK_RAW_1 (D, val, X);               \
 260     }                                           \
 261   while (0)
 262
 263 # define FP_PACK_DP(val, X)                     \
 264   do                                            \
 265     {                                           \
 266       _FP_PACK_CANONICAL (D, 1, X);             \
 267       if (!FP_INHIBIT_RESULTS)                  \
 268         _FP_PACK_RAW_1_P (D, val, X);           \
 269     }                                           \
 270   while (0)
 271
 272 # define FP_PACK_SEMIRAW_D(val, X)              \
 273   do                                            \
 274     {                                           \
 275       _FP_PACK_SEMIRAW (D, 1, X);               \
 276       _FP_PACK_RAW_1 (D, val, X);               \
 277     }                                           \
 278   while (0)
 279
 280 # define FP_PACK_SEMIRAW_DP(val, X)             \
 281   do                                            \
 282     {                                           \
 283       _FP_PACK_SEMIRAW (D, 1, X);               \
 284       if (!FP_INHIBIT_RESULTS)                  \
 285         _FP_PACK_RAW_1_P (D, val, X);           \
 286     }                                           \
 287   while (0)
 288
 289 # define FP_ISSIGNAN_D(X)               _FP_ISSIGNAN (D, 1, X)
 290 # define FP_NEG_D(R, X)                 _FP_NEG (D, 1, R, X)
 291 # define FP_ADD_D(R, X, Y)              _FP_ADD (D, 1, R, X, Y)
 292 # define FP_SUB_D(R, X, Y)              _FP_SUB (D, 1, R, X, Y)
 293 # define FP_MUL_D(R, X, Y)              _FP_MUL (D, 1, R, X, Y)
 294 # define FP_DIV_D(R, X, Y)              _FP_DIV (D, 1, R, X, Y)
 295 # define FP_SQRT_D(R, X)                _FP_SQRT (D, 1, R, X)
 296 # define _FP_SQRT_MEAT_D(R, S, T, X, Q) _FP_SQRT_MEAT_1 (R, S, T, X, Q)
 297 # define FP_FMA_D(R, X, Y, Z)           _FP_FMA (D, 1, 2, R, X, Y, Z)
 298
 299 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 300    the target machine.  */
 301
 302 # define FP_CMP_D(r, X, Y, un)          _FP_CMP (D, 1, r, X, Y, un)
 303 # define FP_CMP_EQ_D(r, X, Y)           _FP_CMP_EQ (D, 1, r, X, Y)
 304 # define FP_CMP_UNORD_D(r, X, Y)        _FP_CMP_UNORD (D, 1, r, X, Y)
 305
 306 # define FP_TO_INT_D(r, X, rsz, rsg)    _FP_TO_INT (D, 1, r, X, rsz, rsg)
 307 # define FP_FROM_INT_D(X, r, rs, rt)    _FP_FROM_INT (D, 1, X, r, rs, rt)
 308
 309 # define _FP_FRAC_HIGH_D(X)     _FP_FRAC_HIGH_1 (X)
 310 # define _FP_FRAC_HIGH_RAW_D(X) _FP_FRAC_HIGH_1 (X)
 311
 312 # define _FP_FRAC_HIGH_DW_D(X)  _FP_FRAC_HIGH_2 (X)
 313
 314 #endif /* W_TYPE_SIZE < 64 */