soft-fp/single.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Single Precision.
   3    Copyright (C) 1997-2017 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 #ifndef SOFT_FP_SINGLE_H
  34 #define SOFT_FP_SINGLE_H        1
  35
  36 #if _FP_W_TYPE_SIZE < 32
  37 # error "Here's a nickel kid.  Go buy yourself a real computer."
  38 #endif
  39
  40 #define _FP_FRACTBITS_S         _FP_W_TYPE_SIZE
  41
  42 #if _FP_W_TYPE_SIZE < 64
  43 # define _FP_FRACTBITS_DW_S     (2 * _FP_W_TYPE_SIZE)
  44 #else
  45 # define _FP_FRACTBITS_DW_S     _FP_W_TYPE_SIZE
  46 #endif
  47
  48 #define _FP_FRACBITS_S          24
  49 #define _FP_FRACXBITS_S         (_FP_FRACTBITS_S - _FP_FRACBITS_S)
  50 #define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  51 #define _FP_WFRACXBITS_S        (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
  52 #define _FP_EXPBITS_S           8
  53 #define _FP_EXPBIAS_S           127
  54 #define _FP_EXPMAX_S            255
  55 #define _FP_QNANBIT_S           ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2))
  56 #define _FP_QNANBIT_SH_S        ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
  57 #define _FP_IMPLBIT_S           ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1))
  58 #define _FP_IMPLBIT_SH_S        ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
  59 #define _FP_OVERFLOW_S          ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_S))
  60
  61 #define _FP_WFRACBITS_DW_S      (2 * _FP_WFRACBITS_S)
  62 #define _FP_WFRACXBITS_DW_S     (_FP_FRACTBITS_DW_S - _FP_WFRACBITS_DW_S)
  63 #define _FP_HIGHBIT_DW_S        \
  64   ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_S - 1) % _FP_W_TYPE_SIZE)
  65
  66 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  67    chosen by the target machine.  */
  68
  69 typedef float SFtype __attribute__ ((mode (SF)));
  70
  71 union _FP_UNION_S
  72 {
  73   SFtype flt;
  74   struct _FP_STRUCT_LAYOUT
  75   {
  76 #if __BYTE_ORDER == __BIG_ENDIAN
  77     unsigned sign : 1;
  78     unsigned exp  : _FP_EXPBITS_S;
  79     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  80 #else
  81     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  82     unsigned exp  : _FP_EXPBITS_S;
  83     unsigned sign : 1;
  84 #endif
  85   } bits __attribute__ ((packed));
  86 };
  87
  88 #define FP_DECL_S(X)            _FP_DECL (1, X)
  89 #define FP_UNPACK_RAW_S(X, val) _FP_UNPACK_RAW_1 (S, X, (val))
  90 #define FP_UNPACK_RAW_SP(X, val)        _FP_UNPACK_RAW_1_P (S, X, (val))
  91 #define FP_PACK_RAW_S(val, X)   _FP_PACK_RAW_1 (S, (val), X)
  92 #define FP_PACK_RAW_SP(val, X)                  \
  93   do                                            \
  94     {                                           \
  95       if (!FP_INHIBIT_RESULTS)                  \
  96         _FP_PACK_RAW_1_P (S, (val), X);         \
  97     }                                           \
  98   while (0)
  99
 100 #define FP_UNPACK_S(X, val)                     \
 101   do                                            \
 102     {                                           \
 103       _FP_UNPACK_RAW_1 (S, X, (val));           \
 104       _FP_UNPACK_CANONICAL (S, 1, X);           \
 105     }                                           \
 106   while (0)
 107
 108 #define FP_UNPACK_SP(X, val)                    \
 109   do                                            \
 110     {                                           \
 111       _FP_UNPACK_RAW_1_P (S, X, (val));         \
 112       _FP_UNPACK_CANONICAL (S, 1, X);           \
 113     }                                           \
 114   while (0)
 115
 116 #define FP_UNPACK_SEMIRAW_S(X, val)             \
 117   do                                            \
 118     {                                           \
 119       _FP_UNPACK_RAW_1 (S, X, (val));           \
 120       _FP_UNPACK_SEMIRAW (S, 1, X);             \
 121     }                                           \
 122   while (0)
 123
 124 #define FP_UNPACK_SEMIRAW_SP(X, val)            \
 125   do                                            \
 126     {                                           \
 127       _FP_UNPACK_RAW_1_P (S, X, (val));         \
 128       _FP_UNPACK_SEMIRAW (S, 1, X);             \
 129     }                                           \
 130   while (0)
 131
 132 #define FP_PACK_S(val, X)                       \
 133   do                                            \
 134     {                                           \
 135       _FP_PACK_CANONICAL (S, 1, X);             \
 136       _FP_PACK_RAW_1 (S, (val), X);             \
 137     }                                           \
 138   while (0)
 139
 140 #define FP_PACK_SP(val, X)                      \
 141   do                                            \
 142     {                                           \
 143       _FP_PACK_CANONICAL (S, 1, X);             \
 144       if (!FP_INHIBIT_RESULTS)                  \
 145         _FP_PACK_RAW_1_P (S, (val), X);         \
 146     }                                           \
 147   while (0)
 148
 149 #define FP_PACK_SEMIRAW_S(val, X)               \
 150   do                                            \
 151     {                                           \
 152       _FP_PACK_SEMIRAW (S, 1, X);               \
 153       _FP_PACK_RAW_1 (S, (val), X);             \
 154     }                                           \
 155   while (0)
 156
 157 #define FP_PACK_SEMIRAW_SP(val, X)              \
 158   do                                            \
 159     {                                           \
 160       _FP_PACK_SEMIRAW (S, 1, X);               \
 161       if (!FP_INHIBIT_RESULTS)                  \
 162         _FP_PACK_RAW_1_P (S, (val), X);         \
 163     }                                           \
 164   while (0)
 165
 166 #define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN (S, 1, X)
 167 #define FP_NEG_S(R, X)                  _FP_NEG (S, 1, R, X)
 168 #define FP_ADD_S(R, X, Y)               _FP_ADD (S, 1, R, X, Y)
 169 #define FP_SUB_S(R, X, Y)               _FP_SUB (S, 1, R, X, Y)
 170 #define FP_MUL_S(R, X, Y)               _FP_MUL (S, 1, R, X, Y)
 171 #define FP_DIV_S(R, X, Y)               _FP_DIV (S, 1, R, X, Y)
 172 #define FP_SQRT_S(R, X)                 _FP_SQRT (S, 1, R, X)
 173 #define _FP_SQRT_MEAT_S(R, S, T, X, Q)  _FP_SQRT_MEAT_1 (R, S, T, X, (Q))
 174
 175 #if _FP_W_TYPE_SIZE < 64
 176 # define FP_FMA_S(R, X, Y, Z)   _FP_FMA (S, 1, 2, R, X, Y, Z)
 177 #else
 178 # define FP_FMA_S(R, X, Y, Z)   _FP_FMA (S, 1, 1, R, X, Y, Z)
 179 #endif
 180
 181 #define FP_CMP_S(r, X, Y, un, ex)       _FP_CMP (S, 1, (r), X, Y, (un), (ex))
 182 #define FP_CMP_EQ_S(r, X, Y, ex)        _FP_CMP_EQ (S, 1, (r), X, Y, (ex))
 183 #define FP_CMP_UNORD_S(r, X, Y, ex)     _FP_CMP_UNORD (S, 1, (r), X, Y, (ex))
 184
 185 #define FP_TO_INT_S(r, X, rsz, rsg)     _FP_TO_INT (S, 1, (r), X, (rsz), (rsg))
 186 #define FP_TO_INT_ROUND_S(r, X, rsz, rsg)       \
 187   _FP_TO_INT_ROUND (S, 1, (r), X, (rsz), (rsg))
 188 #define FP_FROM_INT_S(X, r, rs, rt)     _FP_FROM_INT (S, 1, X, (r), (rs), rt)
 189
 190 #define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1 (X)
 191 #define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1 (X)
 192
 193 #if _FP_W_TYPE_SIZE < 64
 194 # define _FP_FRAC_HIGH_DW_S(X)  _FP_FRAC_HIGH_2 (X)
 195 #else
 196 # define _FP_FRAC_HIGH_DW_S(X)  _FP_FRAC_HIGH_1 (X)
 197 #endif
 198
 199 #endif /* !SOFT_FP_SINGLE_H */