soft-fp/double.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Double Precision
   3    Copyright (C) 1997-2013 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 #else
  40 #define _FP_FRACTBITS_D         _FP_W_TYPE_SIZE
  41 #endif
  42
  43 #define _FP_FRACBITS_D          53
  44 #define _FP_FRACXBITS_D         (_FP_FRACTBITS_D - _FP_FRACBITS_D)
  45 #define _FP_WFRACBITS_D         (_FP_WORKBITS + _FP_FRACBITS_D)
  46 #define _FP_WFRACXBITS_D        (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
  47 #define _FP_EXPBITS_D           11
  48 #define _FP_EXPBIAS_D           1023
  49 #define _FP_EXPMAX_D            2047
  50
  51 #define _FP_QNANBIT_D           \
  52         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
  53 #define _FP_QNANBIT_SH_D                \
  54         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
  55 #define _FP_IMPLBIT_D           \
  56         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
  57 #define _FP_IMPLBIT_SH_D                \
  58         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
  59 #define _FP_OVERFLOW_D          \
  60         ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
  61
  62 typedef float DFtype __attribute__((mode(DF)));
  63
  64 #if _FP_W_TYPE_SIZE < 64
  65
  66 union _FP_UNION_D
  67 {
  68   DFtype flt;
  69   struct _FP_STRUCT_LAYOUT {
  70 #if __BYTE_ORDER == __BIG_ENDIAN
  71     unsigned sign  : 1;
  72     unsigned exp   : _FP_EXPBITS_D;
  73     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  74     unsigned frac0 : _FP_W_TYPE_SIZE;
  75 #else
  76     unsigned frac0 : _FP_W_TYPE_SIZE;
  77     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  78     unsigned exp   : _FP_EXPBITS_D;
  79     unsigned sign  : 1;
  80 #endif
  81   } bits __attribute__((packed));
  82 };
  83
  84 #define FP_DECL_D(X)            _FP_DECL(2,X)
  85 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  86 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  87 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  88 #define FP_PACK_RAW_DP(val,X)           \
  89   do {                                  \
  90     if (!FP_INHIBIT_RESULTS)            \
  91       _FP_PACK_RAW_2_P(D,val,X);        \
  92   } while (0)
  93
  94 #define FP_UNPACK_D(X,val)              \
  95   do {                                  \
  96     _FP_UNPACK_RAW_2(D,X,val);          \
  97     _FP_UNPACK_CANONICAL(D,2,X);        \
  98   } while (0)
  99
 100 #define FP_UNPACK_DP(X,val)             \
 101   do {                                  \
 102     _FP_UNPACK_RAW_2_P(D,X,val);        \
 103     _FP_UNPACK_CANONICAL(D,2,X);        \
 104   } while (0)
 105
 106 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 107   do {                                  \
 108     _FP_UNPACK_RAW_2(D,X,val);          \
 109     _FP_UNPACK_SEMIRAW(D,2,X);          \
 110   } while (0)
 111
 112 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 113   do {                                  \
 114     _FP_UNPACK_RAW_2_P(D,X,val);        \
 115     _FP_UNPACK_SEMIRAW(D,2,X);          \
 116   } while (0)
 117
 118 #define FP_PACK_D(val,X)                \
 119   do {                                  \
 120     _FP_PACK_CANONICAL(D,2,X);          \
 121     _FP_PACK_RAW_2(D,val,X);            \
 122   } while (0)
 123
 124 #define FP_PACK_DP(val,X)               \
 125   do {                                  \
 126     _FP_PACK_CANONICAL(D,2,X);          \
 127     if (!FP_INHIBIT_RESULTS)            \
 128       _FP_PACK_RAW_2_P(D,val,X);        \
 129   } while (0)
 130
 131 #define FP_PACK_SEMIRAW_D(val,X)        \
 132   do {                                  \
 133     _FP_PACK_SEMIRAW(D,2,X);            \
 134     _FP_PACK_RAW_2(D,val,X);            \
 135   } while (0)
 136
 137 #define FP_PACK_SEMIRAW_DP(val,X)       \
 138   do {                                  \
 139     _FP_PACK_SEMIRAW(D,2,X);            \
 140     if (!FP_INHIBIT_RESULTS)            \
 141       _FP_PACK_RAW_2_P(D,val,X);        \
 142   } while (0)
 143
 144 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 145 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 146 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 147 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 148 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 149 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 150 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 151 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 152
 153 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 154 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 155 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,2,r,X,Y)
 156
 157 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 158 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 159
 160 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 161 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 162
 163 #else
 164
 165 union _FP_UNION_D
 166 {
 167   DFtype flt;
 168   struct _FP_STRUCT_LAYOUT {
 169 #if __BYTE_ORDER == __BIG_ENDIAN
 170     unsigned sign   : 1;
 171     unsigned exp    : _FP_EXPBITS_D;
 172     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 173 #else
 174     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 175     unsigned exp    : _FP_EXPBITS_D;
 176     unsigned sign   : 1;
 177 #endif
 178   } bits __attribute__((packed));
 179 };
 180
 181 #define FP_DECL_D(X)            _FP_DECL(1,X)
 182 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 183 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 184 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 185 #define FP_PACK_RAW_DP(val,X)           \
 186   do {                                  \
 187     if (!FP_INHIBIT_RESULTS)            \
 188       _FP_PACK_RAW_1_P(D,val,X);        \
 189   } while (0)
 190
 191 #define FP_UNPACK_D(X,val)              \
 192   do {                                  \
 193     _FP_UNPACK_RAW_1(D,X,val);          \
 194     _FP_UNPACK_CANONICAL(D,1,X);        \
 195   } while (0)
 196
 197 #define FP_UNPACK_DP(X,val)             \
 198   do {                                  \
 199     _FP_UNPACK_RAW_1_P(D,X,val);        \
 200     _FP_UNPACK_CANONICAL(D,1,X);        \
 201   } while (0)
 202
 203 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 204   do {                                  \
 205     _FP_UNPACK_RAW_1(D,X,val);          \
 206     _FP_UNPACK_SEMIRAW(D,1,X);          \
 207   } while (0)
 208
 209 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 210   do {                                  \
 211     _FP_UNPACK_RAW_1_P(D,X,val);        \
 212     _FP_UNPACK_SEMIRAW(D,1,X);          \
 213   } while (0)
 214
 215 #define FP_PACK_D(val,X)                \
 216   do {                                  \
 217     _FP_PACK_CANONICAL(D,1,X);          \
 218     _FP_PACK_RAW_1(D,val,X);            \
 219   } while (0)
 220
 221 #define FP_PACK_DP(val,X)               \
 222   do {                                  \
 223     _FP_PACK_CANONICAL(D,1,X);          \
 224     if (!FP_INHIBIT_RESULTS)            \
 225       _FP_PACK_RAW_1_P(D,val,X);        \
 226   } while (0)
 227
 228 #define FP_PACK_SEMIRAW_D(val,X)        \
 229   do {                                  \
 230     _FP_PACK_SEMIRAW(D,1,X);            \
 231     _FP_PACK_RAW_1(D,val,X);            \
 232   } while (0)
 233
 234 #define FP_PACK_SEMIRAW_DP(val,X)       \
 235   do {                                  \
 236     _FP_PACK_SEMIRAW(D,1,X);            \
 237     if (!FP_INHIBIT_RESULTS)            \
 238       _FP_PACK_RAW_1_P(D,val,X);        \
 239   } while (0)
 240
 241 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 242 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 243 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 244 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 245 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 246 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 247 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 248 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 249
 250 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 251    the target machine.  */
 252
 253 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 254 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 255 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,1,r,X,Y)
 256
 257 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 258 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 259
 260 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 261 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 262
 263 #endif /* W_TYPE_SIZE < 64 */