soft-fp/double.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Double Precision
   3    Copyright (C) 1997,1998,1999 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 Library General Public License as
  12    published by the Free Software Foundation; either version 2 of the
  13    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    Library General Public License for more details.
  19
  20    You should have received a copy of the GNU Library General Public
  21    License along with the GNU C Library; see the file COPYING.LIB.  If
  22    not, write to the Free Software Foundation, Inc.,
  23    59 Temple Place - Suite 330, Boston, MA 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_IMPLBIT_D           \
  46         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
  47 #define _FP_OVERFLOW_D          \
  48         ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
  49
  50 #if _FP_W_TYPE_SIZE < 64
  51
  52 union _FP_UNION_D
  53 {
  54   double flt;
  55   struct {
  56 #if __BYTE_ORDER == __BIG_ENDIAN
  57     unsigned sign  : 1;
  58     unsigned exp   : _FP_EXPBITS_D;
  59     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  60     unsigned frac0 : _FP_W_TYPE_SIZE;
  61 #else
  62     unsigned frac0 : _FP_W_TYPE_SIZE;
  63     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  64     unsigned exp   : _FP_EXPBITS_D;
  65     unsigned sign  : 1;
  66 #endif
  67   } bits __attribute__((packed));
  68 };
  69
  70 #define FP_DECL_D(X)            _FP_DECL(2,X)
  71 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  72 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  73 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  74 #define FP_PACK_RAW_DP(val,X)           \
  75   do {                                  \
  76     if (!FP_INHIBIT_RESULTS)            \
  77       _FP_PACK_RAW_2_P(D,val,X);        \
  78   } while (0)
  79
  80 #define FP_UNPACK_D(X,val)              \
  81   do {                                  \
  82     _FP_UNPACK_RAW_2(D,X,val);          \
  83     _FP_UNPACK_CANONICAL(D,2,X);        \
  84   } while (0)
  85
  86 #define FP_UNPACK_DP(X,val)             \
  87   do {                                  \
  88     _FP_UNPACK_RAW_2_P(D,X,val);        \
  89     _FP_UNPACK_CANONICAL(D,2,X);        \
  90   } while (0)
  91
  92 #define FP_PACK_D(val,X)                \
  93   do {                                  \
  94     _FP_PACK_CANONICAL(D,2,X);          \
  95     _FP_PACK_RAW_2(D,val,X);            \
  96   } while (0)
  97
  98 #define FP_PACK_DP(val,X)               \
  99   do {                                  \
 100     _FP_PACK_CANONICAL(D,2,X);          \
 101     if (!FP_INHIBIT_RESULTS)            \
 102       _FP_PACK_RAW_2_P(D,val,X);        \
 103   } while (0)
 104
 105 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 106 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 107 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 108 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 109 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 110 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 111 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 112 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 113
 114 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 115 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 116
 117 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 118 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 119
 120 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 121 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 122
 123 #else
 124
 125 union _FP_UNION_D
 126 {
 127   double flt;
 128   struct {
 129 #if __BYTE_ORDER == __BIG_ENDIAN
 130     unsigned sign : 1;
 131     unsigned exp  : _FP_EXPBITS_D;
 132     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 133 #else
 134     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 135     unsigned exp  : _FP_EXPBITS_D;
 136     unsigned sign : 1;
 137 #endif
 138   } bits __attribute__((packed));
 139 };
 140
 141 #define FP_DECL_D(X)            _FP_DECL(1,X)
 142 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 143 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 144 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 145 #define FP_PACK_RAW_DP(val,X)           \
 146   do {                                  \
 147     if (!FP_INHIBIT_RESULTS)            \
 148       _FP_PACK_RAW_1_P(D,val,X);        \
 149   } while (0)
 150
 151 #define FP_UNPACK_D(X,val)              \
 152   do {                                  \
 153     _FP_UNPACK_RAW_1(D,X,val);          \
 154     _FP_UNPACK_CANONICAL(D,1,X);        \
 155   } while (0)
 156
 157 #define FP_UNPACK_DP(X,val)             \
 158   do {                                  \
 159     _FP_UNPACK_RAW_1_P(D,X,val);        \
 160     _FP_UNPACK_CANONICAL(D,1,X);        \
 161   } while (0)
 162
 163 #define FP_PACK_D(val,X)                \
 164   do {                                  \
 165     _FP_PACK_CANONICAL(D,1,X);          \
 166     _FP_PACK_RAW_1(D,val,X);            \
 167   } while (0)
 168
 169 #define FP_PACK_DP(val,X)               \
 170   do {                                  \
 171     _FP_PACK_CANONICAL(D,1,X);          \
 172     if (!FP_INHIBIT_RESULTS)            \
 173       _FP_PACK_RAW_1_P(D,val,X);        \
 174   } while (0)
 175
 176 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 177 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 178 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 179 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 180 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 181 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 182 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 183 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 184
 185 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 186    the target machine.  */
 187
 188 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 189 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 190
 191 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 192 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 193
 194 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 195 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 196
 197 #endif /* W_TYPE_SIZE < 64 */