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 #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 #if __BYTE_ORDER == __BIG_ENDIAN
  78     unsigned sign  : 1;
  79     unsigned exp   : _FP_EXPBITS_D;
  80     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  81     unsigned frac0 : _FP_W_TYPE_SIZE;
  82 #else
  83     unsigned frac0 : _FP_W_TYPE_SIZE;
  84     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  85     unsigned exp   : _FP_EXPBITS_D;
  86     unsigned sign  : 1;
  87 #endif
  88   } bits __attribute__((packed));
  89 };
  90
  91 #define FP_DECL_D(X)            _FP_DECL(2,X)
  92 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  93 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  94 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  95 #define FP_PACK_RAW_DP(val,X)           \
  96   do {                                  \
  97     if (!FP_INHIBIT_RESULTS)            \
  98       _FP_PACK_RAW_2_P(D,val,X);        \
  99   } while (0)
 100
 101 #define FP_UNPACK_D(X,val)              \
 102   do {                                  \
 103     _FP_UNPACK_RAW_2(D,X,val);          \
 104     _FP_UNPACK_CANONICAL(D,2,X);        \
 105   } while (0)
 106
 107 #define FP_UNPACK_DP(X,val)             \
 108   do {                                  \
 109     _FP_UNPACK_RAW_2_P(D,X,val);        \
 110     _FP_UNPACK_CANONICAL(D,2,X);        \
 111   } while (0)
 112
 113 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 114   do {                                  \
 115     _FP_UNPACK_RAW_2(D,X,val);          \
 116     _FP_UNPACK_SEMIRAW(D,2,X);          \
 117   } while (0)
 118
 119 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 120   do {                                  \
 121     _FP_UNPACK_RAW_2_P(D,X,val);        \
 122     _FP_UNPACK_SEMIRAW(D,2,X);          \
 123   } while (0)
 124
 125 #define FP_PACK_D(val,X)                \
 126   do {                                  \
 127     _FP_PACK_CANONICAL(D,2,X);          \
 128     _FP_PACK_RAW_2(D,val,X);            \
 129   } while (0)
 130
 131 #define FP_PACK_DP(val,X)               \
 132   do {                                  \
 133     _FP_PACK_CANONICAL(D,2,X);          \
 134     if (!FP_INHIBIT_RESULTS)            \
 135       _FP_PACK_RAW_2_P(D,val,X);        \
 136   } while (0)
 137
 138 #define FP_PACK_SEMIRAW_D(val,X)        \
 139   do {                                  \
 140     _FP_PACK_SEMIRAW(D,2,X);            \
 141     _FP_PACK_RAW_2(D,val,X);            \
 142   } while (0)
 143
 144 #define FP_PACK_SEMIRAW_DP(val,X)       \
 145   do {                                  \
 146     _FP_PACK_SEMIRAW(D,2,X);            \
 147     if (!FP_INHIBIT_RESULTS)            \
 148       _FP_PACK_RAW_2_P(D,val,X);        \
 149   } while (0)
 150
 151 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 152 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 153 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 154 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 155 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 156 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 157 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 158 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 159 #define FP_FMA_D(R,X,Y,Z)               _FP_FMA(D,2,4,R,X,Y,Z)
 160
 161 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 162 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 163 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,2,r,X,Y)
 164
 165 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 166 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 167
 168 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 169 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 170
 171 #define _FP_FRAC_HIGH_DW_D(X)   _FP_FRAC_HIGH_4(X)
 172
 173 #else
 174
 175 union _FP_UNION_D
 176 {
 177   DFtype flt;
 178   struct _FP_STRUCT_LAYOUT {
 179 #if __BYTE_ORDER == __BIG_ENDIAN
 180     unsigned sign   : 1;
 181     unsigned exp    : _FP_EXPBITS_D;
 182     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 183 #else
 184     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 185     unsigned exp    : _FP_EXPBITS_D;
 186     unsigned sign   : 1;
 187 #endif
 188   } bits __attribute__((packed));
 189 };
 190
 191 #define FP_DECL_D(X)            _FP_DECL(1,X)
 192 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 193 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 194 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 195 #define FP_PACK_RAW_DP(val,X)           \
 196   do {                                  \
 197     if (!FP_INHIBIT_RESULTS)            \
 198       _FP_PACK_RAW_1_P(D,val,X);        \
 199   } while (0)
 200
 201 #define FP_UNPACK_D(X,val)              \
 202   do {                                  \
 203     _FP_UNPACK_RAW_1(D,X,val);          \
 204     _FP_UNPACK_CANONICAL(D,1,X);        \
 205   } while (0)
 206
 207 #define FP_UNPACK_DP(X,val)             \
 208   do {                                  \
 209     _FP_UNPACK_RAW_1_P(D,X,val);        \
 210     _FP_UNPACK_CANONICAL(D,1,X);        \
 211   } while (0)
 212
 213 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 214   do {                                  \
 215     _FP_UNPACK_RAW_1(D,X,val);          \
 216     _FP_UNPACK_SEMIRAW(D,1,X);          \
 217   } while (0)
 218
 219 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 220   do {                                  \
 221     _FP_UNPACK_RAW_1_P(D,X,val);        \
 222     _FP_UNPACK_SEMIRAW(D,1,X);          \
 223   } while (0)
 224
 225 #define FP_PACK_D(val,X)                \
 226   do {                                  \
 227     _FP_PACK_CANONICAL(D,1,X);          \
 228     _FP_PACK_RAW_1(D,val,X);            \
 229   } while (0)
 230
 231 #define FP_PACK_DP(val,X)               \
 232   do {                                  \
 233     _FP_PACK_CANONICAL(D,1,X);          \
 234     if (!FP_INHIBIT_RESULTS)            \
 235       _FP_PACK_RAW_1_P(D,val,X);        \
 236   } while (0)
 237
 238 #define FP_PACK_SEMIRAW_D(val,X)        \
 239   do {                                  \
 240     _FP_PACK_SEMIRAW(D,1,X);            \
 241     _FP_PACK_RAW_1(D,val,X);            \
 242   } while (0)
 243
 244 #define FP_PACK_SEMIRAW_DP(val,X)       \
 245   do {                                  \
 246     _FP_PACK_SEMIRAW(D,1,X);            \
 247     if (!FP_INHIBIT_RESULTS)            \
 248       _FP_PACK_RAW_1_P(D,val,X);        \
 249   } while (0)
 250
 251 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 252 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 253 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 254 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 255 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 256 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 257 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 258 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 259 #define FP_FMA_D(R,X,Y,Z)               _FP_FMA(D,1,2,R,X,Y,Z)
 260
 261 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 262    the target machine.  */
 263
 264 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 265 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 266 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,1,r,X,Y)
 267
 268 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 269 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 270
 271 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 272 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 273
 274 #define _FP_FRAC_HIGH_DW_D(X)   _FP_FRAC_HIGH_2(X)
 275
 276 #endif /* W_TYPE_SIZE < 64 */