include/math-emu/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 #ifndef    __MATH_EMU_DOUBLE_H__
  26 #define    __MATH_EMU_DOUBLE_H__
  27
  28 #if _FP_W_TYPE_SIZE < 32
  29 #error "Here's a nickel kid.  Go buy yourself a real computer."
  30 #endif
  31
  32 #if _FP_W_TYPE_SIZE < 64
  33 #define _FP_FRACTBITS_D         (2 * _FP_W_TYPE_SIZE)
  34 #else
  35 #define _FP_FRACTBITS_D         _FP_W_TYPE_SIZE
  36 #endif
  37
  38 #define _FP_FRACBITS_D          53
  39 #define _FP_FRACXBITS_D         (_FP_FRACTBITS_D - _FP_FRACBITS_D)
  40 #define _FP_WFRACBITS_D         (_FP_WORKBITS + _FP_FRACBITS_D)
  41 #define _FP_WFRACXBITS_D        (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
  42 #define _FP_EXPBITS_D           11
  43 #define _FP_EXPBIAS_D           1023
  44 #define _FP_EXPMAX_D            2047
  45
  46 #define _FP_QNANBIT_D           \
  47         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
  48 #define _FP_IMPLBIT_D           \
  49         ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
  50 #define _FP_OVERFLOW_D          \
  51         ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
  52
  53 #if _FP_W_TYPE_SIZE < 64
  54
  55 union _FP_UNION_D
  56 {
  57   double flt;
  58   struct {
  59 #if __BYTE_ORDER == __BIG_ENDIAN
  60     unsigned sign  : 1;
  61     unsigned exp   : _FP_EXPBITS_D;
  62     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  63     unsigned frac0 : _FP_W_TYPE_SIZE;
  64 #else
  65     unsigned frac0 : _FP_W_TYPE_SIZE;
  66     unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
  67     unsigned exp   : _FP_EXPBITS_D;
  68     unsigned sign  : 1;
  69 #endif
  70   } bits __attribute__((packed));
  71 };
  72
  73 #define FP_DECL_D(X)            _FP_DECL(2,X)
  74 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_2(D,X,val)
  75 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
  76 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_2(D,val,X)
  77 #define FP_PACK_RAW_DP(val,X)           \
  78   do {                                  \
  79     if (!FP_INHIBIT_RESULTS)            \
  80       _FP_PACK_RAW_2_P(D,val,X);        \
  81   } while (0)
  82
  83 #define FP_UNPACK_D(X,val)              \
  84   do {                                  \
  85     _FP_UNPACK_RAW_2(D,X,val);          \
  86     _FP_UNPACK_CANONICAL(D,2,X);        \
  87   } while (0)
  88
  89 #define FP_UNPACK_DP(X,val)             \
  90   do {                                  \
  91     _FP_UNPACK_RAW_2_P(D,X,val);        \
  92     _FP_UNPACK_CANONICAL(D,2,X);        \
  93   } while (0)
  94
  95 #define FP_PACK_D(val,X)                \
  96   do {                                  \
  97     _FP_PACK_CANONICAL(D,2,X);          \
  98     _FP_PACK_RAW_2(D,val,X);            \
  99   } while (0)
 100
 101 #define FP_PACK_DP(val,X)               \
 102   do {                                  \
 103     _FP_PACK_CANONICAL(D,2,X);          \
 104     if (!FP_INHIBIT_RESULTS)            \
 105       _FP_PACK_RAW_2_P(D,val,X);        \
 106   } while (0)
 107
 108 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,2,X)
 109 #define FP_NEG_D(R,X)                   _FP_NEG(D,2,R,X)
 110 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,2,R,X,Y)
 111 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,2,R,X,Y)
 112 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,2,R,X,Y)
 113 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,2,R,X,Y)
 114 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,2,R,X)
 115 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_2(R,S,T,X,Q)
 116
 117 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,2,r,X,Y,un)
 118 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,2,r,X,Y)
 119
 120 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,2,r,X,rsz,rsg)
 121 #define FP_TO_INT_ROUND_D(r,X,rsz,rsg)  _FP_TO_INT_ROUND(D,2,r,X,rsz,rsg)
 122 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,2,X,r,rs,rt)
 123
 124 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_2(X)
 125 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_2(X)
 126
 127 #else
 128
 129 union _FP_UNION_D
 130 {
 131   double flt;
 132   struct {
 133 #if __BYTE_ORDER == __BIG_ENDIAN
 134     unsigned sign : 1;
 135     unsigned exp  : _FP_EXPBITS_D;
 136     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 137 #else
 138     unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
 139     unsigned exp  : _FP_EXPBITS_D;
 140     unsigned sign : 1;
 141 #endif
 142   } bits __attribute__((packed));
 143 };
 144
 145 #define FP_DECL_D(X)            _FP_DECL(1,X)
 146 #define FP_UNPACK_RAW_D(X,val)  _FP_UNPACK_RAW_1(D,X,val)
 147 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
 148 #define FP_PACK_RAW_D(val,X)    _FP_PACK_RAW_1(D,val,X)
 149 #define FP_PACK_RAW_DP(val,X)           \
 150   do {                                  \
 151     if (!FP_INHIBIT_RESULTS)            \
 152       _FP_PACK_RAW_1_P(D,val,X);        \
 153   } while (0)
 154
 155 #define FP_UNPACK_D(X,val)              \
 156   do {                                  \
 157     _FP_UNPACK_RAW_1(D,X,val);          \
 158     _FP_UNPACK_CANONICAL(D,1,X);        \
 159   } while (0)
 160
 161 #define FP_UNPACK_DP(X,val)             \
 162   do {                                  \
 163     _FP_UNPACK_RAW_1_P(D,X,val);        \
 164     _FP_UNPACK_CANONICAL(D,1,X);        \
 165   } while (0)
 166
 167 #define FP_PACK_D(val,X)                \
 168   do {                                  \
 169     _FP_PACK_CANONICAL(D,1,X);          \
 170     _FP_PACK_RAW_1(D,val,X);            \
 171   } while (0)
 172
 173 #define FP_PACK_DP(val,X)               \
 174   do {                                  \
 175     _FP_PACK_CANONICAL(D,1,X);          \
 176     if (!FP_INHIBIT_RESULTS)            \
 177       _FP_PACK_RAW_1_P(D,val,X);        \
 178   } while (0)
 179
 180 #define FP_ISSIGNAN_D(X)                _FP_ISSIGNAN(D,1,X)
 181 #define FP_NEG_D(R,X)                   _FP_NEG(D,1,R,X)
 182 #define FP_ADD_D(R,X,Y)                 _FP_ADD(D,1,R,X,Y)
 183 #define FP_SUB_D(R,X,Y)                 _FP_SUB(D,1,R,X,Y)
 184 #define FP_MUL_D(R,X,Y)                 _FP_MUL(D,1,R,X,Y)
 185 #define FP_DIV_D(R,X,Y)                 _FP_DIV(D,1,R,X,Y)
 186 #define FP_SQRT_D(R,X)                  _FP_SQRT(D,1,R,X)
 187 #define _FP_SQRT_MEAT_D(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 188
 189 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
 190    the target machine.  */
 191
 192 #define FP_CMP_D(r,X,Y,un)      _FP_CMP(D,1,r,X,Y,un)
 193 #define FP_CMP_EQ_D(r,X,Y)      _FP_CMP_EQ(D,1,r,X,Y)
 194
 195 #define FP_TO_INT_D(r,X,rsz,rsg)        _FP_TO_INT(D,1,r,X,rsz,rsg)
 196 #define FP_TO_INT_ROUND_D(r,X,rsz,rsg)  _FP_TO_INT_ROUND(D,1,r,X,rsz,rsg)
 197 #define FP_FROM_INT_D(X,r,rs,rt)        _FP_FROM_INT(D,1,X,r,rs,rt)
 198
 199 #define _FP_FRAC_HIGH_D(X)      _FP_FRAC_HIGH_1(X)
 200 #define _FP_FRAC_HIGH_RAW_D(X)  _FP_FRAC_HIGH_1(X)
 201
 202 #endif /* W_TYPE_SIZE < 64 */
 203
 204
 205 #endif /* __MATH_EMU_DOUBLE_H__ */