soft-fp/double.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Double Precision
   3    Copyright (C) 1997,1998,1999,2006 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    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    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with the GNU C Library; if not, write to the Free
  22    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  23    02111-1307 USA.  */
  24
  25 #if _FP_W_TYPE_SIZE < 32
  26 #error "Here's a nickel kid.  Go buy yourself a real computer."
  27 #endif
  28
  29 #if _FP_W_TYPE_SIZE < 64
  30 #define _FP_FRACTBITS_D         (2 * _FP_W_TYPE_SIZE)
  31 #else
  32 #define _FP_FRACTBITS_D         _FP_W_TYPE_SIZE
  33 #endif
  34
  35 #define _FP_FRACBITS_D          53
  36 #define _FP_FRACXBITS_D         (_FP_FRACTBITS_D - _FP_FRACBITS_D)
  37 #define _FP_WFRACBITS_D         (_FP_WORKBITS + _FP_FRACBITS_D)
  38 #define _FP_WFRACXBITS_D        (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
  39 #define _FP_EXPBITS_D           11
  40 #define _FP_EXPBIAS_D           1023
  41 #define _FP_EXPMAX_D            2047
  42
  43 #define _FP_QNANBIT_D           \
  44         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
  45 #define _FP_QNANBIT_SH_D                \
  46         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
  47 #define _FP_IMPLBIT_D           \
  48         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
  49 #define _FP_IMPLBIT_SH_D                \
  50         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
  51 #define _FP_OVERFLOW_D          \
  52         ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
  53
  54 typedef float DFtype __attribute__((mode(DF)));
  55
  56 #if _FP_W_TYPE_SIZE < 64
  57
  58 union _FP_UNION_D
  59 {
  60   DFtype flt;
  61   struct {
  62 #if __BYTE_ORDER == __BIG_ENDIAN
  63     unsigned sign  : 1;
  64     unsigned exp   : _FP_EXPBITS_D;
  65     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  66     unsigned frac0 : _FP_W_TYPE_SIZE;
  67 #else
  68     unsigned frac0 : _FP_W_TYPE_SIZE;
  69     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  70     unsigned exp   : _FP_EXPBITS_D;
  71     unsigned sign  : 1;
  72 #endif
  73   } bits __attribute__((packed));
  74 };
  75
  76 #define FP_DECL_D(X)            _FP_DECL(2,X)
  77 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  78 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  79 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  80 #define FP_PACK_RAW_DP(val,X)           \
  81   do {                                  \
  82     if (!FP_INHIBIT_RESULTS)            \
  83       _FP_PACK_RAW_2_P(D,val,X);        \
  84   } while (0)
  85
  86 #define FP_UNPACK_D(X,val)              \
  87   do {                                  \
  88     _FP_UNPACK_RAW_2(D,X,val);          \
  89     _FP_UNPACK_CANONICAL(D,2,X);        \
  90   } while (0)
  91
  92 #define FP_UNPACK_DP(X,val)             \
  93   do {                                  \
  94     _FP_UNPACK_RAW_2_P(D,X,val);        \
  95     _FP_UNPACK_CANONICAL(D,2,X);        \
  96   } while (0)
  97
  98 #define FP_UNPACK_SEMIRAW_D(X,val)      \
  99   do {                                  \
 100     _FP_UNPACK_RAW_2(D,X,val);          \
 101     _FP_UNPACK_SEMIRAW(D,2,X);          \
 102   } while (0)
 103
 104 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 105   do {                                  \
 106     _FP_UNPACK_RAW_2_P(D,X,val);        \
 107     _FP_UNPACK_SEMIRAW(D,2,X);          \
 108   } while (0)
 109
 110 #define FP_PACK_D(val,X)                \
 111   do {                                  \
 112     _FP_PACK_CANONICAL(D,2,X);          \
 113     _FP_PACK_RAW_2(D,val,X);            \
 114   } while (0)
 115
 116 #define FP_PACK_DP(val,X)               \
 117   do {                                  \
 118     _FP_PACK_CANONICAL(D,2,X);          \
 119     if (!FP_INHIBIT_RESULTS)            \
 120       _FP_PACK_RAW_2_P(D,val,X);        \
 121   } while (0)
 122
 123 #define FP_PACK_SEMIRAW_D(val,X)        \
 124   do {                                  \
 125     _FP_PACK_SEMIRAW(D,2,X);            \
 126     _FP_PACK_RAW_2(D,val,X);            \
 127   } while (0)
 128
 129 #define FP_PACK_SEMIRAW_DP(val,X)       \
 130   do {                                  \
 131     _FP_PACK_SEMIRAW(D,2,X);            \
 132     if (!FP_INHIBIT_RESULTS)            \
 133       _FP_PACK_RAW_2_P(D,val,X);        \
 134   } while (0)
 135
 136 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 137 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 138 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 139 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 140 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 141 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 142 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 143 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 144
 145 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 146 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 147 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,2,r,X,Y)
 148
 149 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 150 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 151
 152 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 153 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 154
 155 #else
 156
 157 union _FP_UNION_D
 158 {
 159   DFtype flt;
 160   struct {
 161 #if __BYTE_ORDER == __BIG_ENDIAN
 162     unsigned sign : 1;
 163     unsigned exp  : _FP_EXPBITS_D;
 164     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 165 #else
 166     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 167     unsigned exp  : _FP_EXPBITS_D;
 168     unsigned sign : 1;
 169 #endif
 170   } bits __attribute__((packed));
 171 };
 172
 173 #define FP_DECL_D(X)            _FP_DECL(1,X)
 174 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 175 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 176 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 177 #define FP_PACK_RAW_DP(val,X)           \
 178   do {                                  \
 179     if (!FP_INHIBIT_RESULTS)            \
 180       _FP_PACK_RAW_1_P(D,val,X);        \
 181   } while (0)
 182
 183 #define FP_UNPACK_D(X,val)              \
 184   do {                                  \
 185     _FP_UNPACK_RAW_1(D,X,val);          \
 186     _FP_UNPACK_CANONICAL(D,1,X);        \
 187   } while (0)
 188
 189 #define FP_UNPACK_DP(X,val)             \
 190   do {                                  \
 191     _FP_UNPACK_RAW_1_P(D,X,val);        \
 192     _FP_UNPACK_CANONICAL(D,1,X);        \
 193   } while (0)
 194
 195 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 196   do {                                  \
 197     _FP_UNPACK_RAW_2(1,X,val);          \
 198     _FP_UNPACK_SEMIRAW(D,1,X);          \
 199   } while (0)
 200
 201 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 202   do {                                  \
 203     _FP_UNPACK_RAW_2_P(1,X,val);        \
 204     _FP_UNPACK_SEMIRAW(D,1,X);          \
 205   } while (0)
 206
 207 #define FP_PACK_D(val,X)                \
 208   do {                                  \
 209     _FP_PACK_CANONICAL(D,1,X);          \
 210     _FP_PACK_RAW_1(D,val,X);            \
 211   } while (0)
 212
 213 #define FP_PACK_DP(val,X)               \
 214   do {                                  \
 215     _FP_PACK_CANONICAL(D,1,X);          \
 216     if (!FP_INHIBIT_RESULTS)            \
 217       _FP_PACK_RAW_1_P(D,val,X);        \
 218   } while (0)
 219
 220 #define FP_PACK_SEMIRAW_D(val,X)        \
 221   do {                                  \
 222     _FP_PACK_SEMIRAW(D,1,X);            \
 223     _FP_PACK_RAW_1(D,val,X);            \
 224   } while (0)
 225
 226 #define FP_PACK_SEMIRAW_DP(val,X)       \
 227   do {                                  \
 228     _FP_PACK_SEMIRAW(D,1,X);            \
 229     if (!FP_INHIBIT_RESULTS)            \
 230       _FP_PACK_RAW_1_P(D,val,X);        \
 231   } while (0)
 232
 233 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 234 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 235 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 236 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 237 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 238 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 239 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 240 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 241
 242 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 243    the target machine.  */
 244
 245 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 246 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 247 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,1,r,X,Y)
 248
 249 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 250 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 251
 252 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 253 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 254
 255 #endif /* W_TYPE_SIZE < 64 */