soft-fp/single.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Single Precision.
   3    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    In addition to the permissions in the GNU Lesser General Public
  12    License, the Free Software Foundation gives you unlimited
  13    permission to link the compiled version of this file into
  14    combinations with other programs, and to distribute those
  15    combinations without any restriction coming from the use of this
  16    file.  (The Lesser General Public License restrictions do apply in
  17    other respects; for example, they cover modification of the file,
  18    and distribution when not linked into a combine executable.)
  19
  20    The GNU C Library is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23    Lesser General Public License for more details.
  24
  25    You should have received a copy of the GNU Lesser General Public
  26    License along with the GNU C Library; if not, see
  27    <https://www.gnu.org/licenses/>.  */
  28
  29 #ifndef SOFT_FP_SINGLE_H
  30 #define SOFT_FP_SINGLE_H        1
  31
  32 #if _FP_W_TYPE_SIZE < 32
  33 # error "Here's a nickel kid.  Go buy yourself a real computer."
  34 #endif
  35
  36 #define _FP_FRACTBITS_S         _FP_W_TYPE_SIZE
  37
  38 #if _FP_W_TYPE_SIZE < 64
  39 # define _FP_FRACTBITS_DW_S     (2 * _FP_W_TYPE_SIZE)
  40 #else
  41 # define _FP_FRACTBITS_DW_S     _FP_W_TYPE_SIZE
  42 #endif
  43
  44 #define _FP_FRACBITS_S          24
  45 #define _FP_FRACXBITS_S         (_FP_FRACTBITS_S - _FP_FRACBITS_S)
  46 #define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  47 #define _FP_WFRACXBITS_S        (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
  48 #define _FP_EXPBITS_S           8
  49 #define _FP_EXPBIAS_S           127
  50 #define _FP_EXPMAX_S            255
  51 #define _FP_QNANBIT_S           ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2))
  52 #define _FP_QNANBIT_SH_S        ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
  53 #define _FP_IMPLBIT_S           ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1))
  54 #define _FP_IMPLBIT_SH_S        ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
  55 #define _FP_OVERFLOW_S          ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_S))
  56
  57 #define _FP_WFRACBITS_DW_S      (2 * _FP_WFRACBITS_S)
  58 #define _FP_WFRACXBITS_DW_S     (_FP_FRACTBITS_DW_S - _FP_WFRACBITS_DW_S)
  59 #define _FP_HIGHBIT_DW_S        \
  60   ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_S - 1) % _FP_W_TYPE_SIZE)
  61
  62 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  63    chosen by the target machine.  */
  64
  65 typedef float SFtype __attribute__ ((mode (SF)));
  66
  67 union _FP_UNION_S
  68 {
  69   SFtype flt;
  70   struct _FP_STRUCT_LAYOUT
  71   {
  72 #if __BYTE_ORDER == __BIG_ENDIAN
  73     unsigned sign : 1;
  74     unsigned exp  : _FP_EXPBITS_S;
  75     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  76 #else
  77     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  78     unsigned exp  : _FP_EXPBITS_S;
  79     unsigned sign : 1;
  80 #endif
  81   } bits;
  82 };
  83
  84 #define FP_DECL_S(X)            _FP_DECL (1, X)
  85 #define FP_UNPACK_RAW_S(X, val) _FP_UNPACK_RAW_1 (S, X, (val))
  86 #define FP_UNPACK_RAW_SP(X, val)        _FP_UNPACK_RAW_1_P (S, X, (val))
  87 #define FP_PACK_RAW_S(val, X)   _FP_PACK_RAW_1 (S, (val), X)
  88 #define FP_PACK_RAW_SP(val, X)                  \
  89   do                                            \
  90     {                                           \
  91       if (!FP_INHIBIT_RESULTS)                  \
  92         _FP_PACK_RAW_1_P (S, (val), X);         \
  93     }                                           \
  94   while (0)
  95
  96 #define FP_UNPACK_S(X, val)                     \
  97   do                                            \
  98     {                                           \
  99       _FP_UNPACK_RAW_1 (S, X, (val));           \
 100       _FP_UNPACK_CANONICAL (S, 1, X);           \
 101     }                                           \
 102   while (0)
 103
 104 #define FP_UNPACK_SP(X, val)                    \
 105   do                                            \
 106     {                                           \
 107       _FP_UNPACK_RAW_1_P (S, X, (val));         \
 108       _FP_UNPACK_CANONICAL (S, 1, X);           \
 109     }                                           \
 110   while (0)
 111
 112 #define FP_UNPACK_SEMIRAW_S(X, val)             \
 113   do                                            \
 114     {                                           \
 115       _FP_UNPACK_RAW_1 (S, X, (val));           \
 116       _FP_UNPACK_SEMIRAW (S, 1, X);             \
 117     }                                           \
 118   while (0)
 119
 120 #define FP_UNPACK_SEMIRAW_SP(X, val)            \
 121   do                                            \
 122     {                                           \
 123       _FP_UNPACK_RAW_1_P (S, X, (val));         \
 124       _FP_UNPACK_SEMIRAW (S, 1, X);             \
 125     }                                           \
 126   while (0)
 127
 128 #define FP_PACK_S(val, X)                       \
 129   do                                            \
 130     {                                           \
 131       _FP_PACK_CANONICAL (S, 1, X);             \
 132       _FP_PACK_RAW_1 (S, (val), X);             \
 133     }                                           \
 134   while (0)
 135
 136 #define FP_PACK_SP(val, X)                      \
 137   do                                            \
 138     {                                           \
 139       _FP_PACK_CANONICAL (S, 1, X);             \
 140       if (!FP_INHIBIT_RESULTS)                  \
 141         _FP_PACK_RAW_1_P (S, (val), X);         \
 142     }                                           \
 143   while (0)
 144
 145 #define FP_PACK_SEMIRAW_S(val, X)               \
 146   do                                            \
 147     {                                           \
 148       _FP_PACK_SEMIRAW (S, 1, X);               \
 149       _FP_PACK_RAW_1 (S, (val), X);             \
 150     }                                           \
 151   while (0)
 152
 153 #define FP_PACK_SEMIRAW_SP(val, X)              \
 154   do                                            \
 155     {                                           \
 156       _FP_PACK_SEMIRAW (S, 1, X);               \
 157       if (!FP_INHIBIT_RESULTS)                  \
 158         _FP_PACK_RAW_1_P (S, (val), X);         \
 159     }                                           \
 160   while (0)
 161
 162 #define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN (S, 1, X)
 163 #define FP_NEG_S(R, X)                  _FP_NEG (S, 1, R, X)
 164 #define FP_ADD_S(R, X, Y)               _FP_ADD (S, 1, R, X, Y)
 165 #define FP_SUB_S(R, X, Y)               _FP_SUB (S, 1, R, X, Y)
 166 #define FP_MUL_S(R, X, Y)               _FP_MUL (S, 1, R, X, Y)
 167 #define FP_DIV_S(R, X, Y)               _FP_DIV (S, 1, R, X, Y)
 168 #define FP_SQRT_S(R, X)                 _FP_SQRT (S, 1, R, X)
 169 #define _FP_SQRT_MEAT_S(R, S, T, X, Q)  _FP_SQRT_MEAT_1 (R, S, T, X, (Q))
 170
 171 #if _FP_W_TYPE_SIZE < 64
 172 # define FP_FMA_S(R, X, Y, Z)   _FP_FMA (S, 1, 2, R, X, Y, Z)
 173 #else
 174 # define FP_FMA_S(R, X, Y, Z)   _FP_FMA (S, 1, 1, R, X, Y, Z)
 175 #endif
 176
 177 #define FP_CMP_S(r, X, Y, un, ex)       _FP_CMP (S, 1, (r), X, Y, (un), (ex))
 178 #define FP_CMP_EQ_S(r, X, Y, ex)        _FP_CMP_EQ (S, 1, (r), X, Y, (ex))
 179 #define FP_CMP_UNORD_S(r, X, Y, ex)     _FP_CMP_UNORD (S, 1, (r), X, Y, (ex))
 180
 181 #define FP_TO_INT_S(r, X, rsz, rsg)     _FP_TO_INT (S, 1, (r), X, (rsz), (rsg))
 182 #define FP_TO_INT_ROUND_S(r, X, rsz, rsg)       \
 183   _FP_TO_INT_ROUND (S, 1, (r), X, (rsz), (rsg))
 184 #define FP_FROM_INT_S(X, r, rs, rt)     _FP_FROM_INT (S, 1, X, (r), (rs), rt)
 185
 186 #define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1 (X)
 187 #define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1 (X)
 188
 189 #if _FP_W_TYPE_SIZE < 64
 190 # define _FP_FRAC_HIGH_DW_S(X)  _FP_FRAC_HIGH_2 (X)
 191 #else
 192 # define _FP_FRAC_HIGH_DW_S(X)  _FP_FRAC_HIGH_1 (X)
 193 #endif
 194
 195 #endif /* !SOFT_FP_SINGLE_H */