soft-fp/double.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Double Precision
   3    Copyright (C) 1997, 1998, 1999, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6    Contributed by Richard Henderson (rth@cygnus.com),
   7                   Jakub Jelinek (jj@ultra.linux.cz),
   8                   David S. Miller (davem@redhat.com) and
   9                   Peter Maydell (pmaydell@chiark.greenend.org.uk).
  10
  11    The GNU C Library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 2.1 of the License, or (at your option) any later version.
  15
  16    In addition to the permissions in the GNU Lesser General Public
  17    License, the Free Software Foundation gives you unlimited
  18    permission to link the compiled version of this file into
  19    combinations with other programs, and to distribute those
  20    combinations without any restriction coming from the use of this
  21    file.  (The Lesser General Public License restrictions do apply in
  22    other respects; for example, they cover modification of the file,
  23    and distribution when not linked into a combine executable.)
  24
  25    The GNU C Library is distributed in the hope that it will be useful,
  26    but WITHOUT ANY WARRANTY; without even the implied warranty of
  27    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  28    Lesser General Public License for more details.
  29
  30    You should have received a copy of the GNU Lesser General Public
  31    License along with the GNU C Library; if not, write to the Free
  32    Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  33    MA 02110-1301, USA.  */
  34
  35 #if _FP_W_TYPE_SIZE < 32
  36 #error "Here's a nickel kid.  Go buy yourself a real computer."
  37 #endif
  38
  39 #if _FP_W_TYPE_SIZE < 64
  40 #define _FP_FRACTBITS_D         (2 * _FP_W_TYPE_SIZE)
  41 #else
  42 #define _FP_FRACTBITS_D         _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 typedef float DFtype __attribute__((mode(DF)));
  65
  66 #if _FP_W_TYPE_SIZE < 64
  67
  68 union _FP_UNION_D
  69 {
  70   DFtype flt;
  71   struct {
  72 #if __BYTE_ORDER == __BIG_ENDIAN
  73     unsigned sign  : 1;
  74     unsigned exp   : _FP_EXPBITS_D;
  75     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  76     unsigned frac0 : _FP_W_TYPE_SIZE;
  77 #else
  78     unsigned frac0 : _FP_W_TYPE_SIZE;
  79     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  80     unsigned exp   : _FP_EXPBITS_D;
  81     unsigned sign  : 1;
  82 #endif
  83   } bits __attribute__((packed));
  84 };
  85
  86 #define FP_DECL_D(X)            _FP_DECL(2,X)
  87 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  88 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  89 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  90 #define FP_PACK_RAW_DP(val,X)           \
  91   do {                                  \
  92     if (!FP_INHIBIT_RESULTS)            \
  93       _FP_PACK_RAW_2_P(D,val,X);        \
  94   } while (0)
  95
  96 #define FP_UNPACK_D(X,val)              \
  97   do {                                  \
  98     _FP_UNPACK_RAW_2(D,X,val);          \
  99     _FP_UNPACK_CANONICAL(D,2,X);        \
 100   } while (0)
 101
 102 #define FP_UNPACK_DP(X,val)             \
 103   do {                                  \
 104     _FP_UNPACK_RAW_2_P(D,X,val);        \
 105     _FP_UNPACK_CANONICAL(D,2,X);        \
 106   } while (0)
 107
 108 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 109   do {                                  \
 110     _FP_UNPACK_RAW_2(D,X,val);          \
 111     _FP_UNPACK_SEMIRAW(D,2,X);          \
 112   } while (0)
 113
 114 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 115   do {                                  \
 116     _FP_UNPACK_RAW_2_P(D,X,val);        \
 117     _FP_UNPACK_SEMIRAW(D,2,X);          \
 118   } while (0)
 119
 120 #define FP_PACK_D(val,X)                \
 121   do {                                  \
 122     _FP_PACK_CANONICAL(D,2,X);          \
 123     _FP_PACK_RAW_2(D,val,X);            \
 124   } while (0)
 125
 126 #define FP_PACK_DP(val,X)               \
 127   do {                                  \
 128     _FP_PACK_CANONICAL(D,2,X);          \
 129     if (!FP_INHIBIT_RESULTS)            \
 130       _FP_PACK_RAW_2_P(D,val,X);        \
 131   } while (0)
 132
 133 #define FP_PACK_SEMIRAW_D(val,X)        \
 134   do {                                  \
 135     _FP_PACK_SEMIRAW(D,2,X);            \
 136     _FP_PACK_RAW_2(D,val,X);            \
 137   } while (0)
 138
 139 #define FP_PACK_SEMIRAW_DP(val,X)       \
 140   do {                                  \
 141     _FP_PACK_SEMIRAW(D,2,X);            \
 142     if (!FP_INHIBIT_RESULTS)            \
 143       _FP_PACK_RAW_2_P(D,val,X);        \
 144   } while (0)
 145
 146 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 147 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 148 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 149 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 150 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 151 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 152 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 153 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 154
 155 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 156 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 157 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,2,r,X,Y)
 158
 159 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 160 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 161
 162 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 163 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 164
 165 #else
 166
 167 union _FP_UNION_D
 168 {
 169   DFtype flt;
 170   struct {
 171 #if __BYTE_ORDER == __BIG_ENDIAN
 172     unsigned sign   : 1;
 173     unsigned exp    : _FP_EXPBITS_D;
 174     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 175 #else
 176     _FP_W_TYPE frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 177     unsigned exp    : _FP_EXPBITS_D;
 178     unsigned sign   : 1;
 179 #endif
 180   } bits __attribute__((packed));
 181 };
 182
 183 #define FP_DECL_D(X)            _FP_DECL(1,X)
 184 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 185 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 186 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 187 #define FP_PACK_RAW_DP(val,X)           \
 188   do {                                  \
 189     if (!FP_INHIBIT_RESULTS)            \
 190       _FP_PACK_RAW_1_P(D,val,X);        \
 191   } while (0)
 192
 193 #define FP_UNPACK_D(X,val)              \
 194   do {                                  \
 195     _FP_UNPACK_RAW_1(D,X,val);          \
 196     _FP_UNPACK_CANONICAL(D,1,X);        \
 197   } while (0)
 198
 199 #define FP_UNPACK_DP(X,val)             \
 200   do {                                  \
 201     _FP_UNPACK_RAW_1_P(D,X,val);        \
 202     _FP_UNPACK_CANONICAL(D,1,X);        \
 203   } while (0)
 204
 205 #define FP_UNPACK_SEMIRAW_D(X,val)      \
 206   do {                                  \
 207     _FP_UNPACK_RAW_1(D,X,val);          \
 208     _FP_UNPACK_SEMIRAW(D,1,X);          \
 209   } while (0)
 210
 211 #define FP_UNPACK_SEMIRAW_DP(X,val)     \
 212   do {                                  \
 213     _FP_UNPACK_RAW_1_P(D,X,val);        \
 214     _FP_UNPACK_SEMIRAW(D,1,X);          \
 215   } while (0)
 216
 217 #define FP_PACK_D(val,X)                \
 218   do {                                  \
 219     _FP_PACK_CANONICAL(D,1,X);          \
 220     _FP_PACK_RAW_1(D,val,X);            \
 221   } while (0)
 222
 223 #define FP_PACK_DP(val,X)               \
 224   do {                                  \
 225     _FP_PACK_CANONICAL(D,1,X);          \
 226     if (!FP_INHIBIT_RESULTS)            \
 227       _FP_PACK_RAW_1_P(D,val,X);        \
 228   } while (0)
 229
 230 #define FP_PACK_SEMIRAW_D(val,X)        \
 231   do {                                  \
 232     _FP_PACK_SEMIRAW(D,1,X);            \
 233     _FP_PACK_RAW_1(D,val,X);            \
 234   } while (0)
 235
 236 #define FP_PACK_SEMIRAW_DP(val,X)       \
 237   do {                                  \
 238     _FP_PACK_SEMIRAW(D,1,X);            \
 239     if (!FP_INHIBIT_RESULTS)            \
 240       _FP_PACK_RAW_1_P(D,val,X);        \
 241   } while (0)
 242
 243 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 244 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 245 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 246 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 247 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 248 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 249 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 250 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 251
 252 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 253    the target machine.  */
 254
 255 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 256 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 257 #define FP_CMP_UNORD_D(r,X,Y)   _FP_CMP_UNORD(D,1,r,X,Y)
 258
 259 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 260 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 261
 262 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 263 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 264
 265 #endif /* W_TYPE_SIZE < 64 */