soft-fp/single.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Single Precision.
   3    Copyright (C) 1997-2015 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 #if _FP_W_TYPE_SIZE < 32
  34 # error "Here's a nickel kid.  Go buy yourself a real computer."
  35 #endif
  36
  37 #define _FP_FRACTBITS_S         _FP_W_TYPE_SIZE
  38
  39 #if _FP_W_TYPE_SIZE < 64
  40 # define _FP_FRACTBITS_DW_S     (2 * _FP_W_TYPE_SIZE)
  41 #else
  42 # define _FP_FRACTBITS_DW_S     _FP_W_TYPE_SIZE
  43 #endif
  44
  45 #define _FP_FRACBITS_S          24
  46 #define _FP_FRACXBITS_S         (_FP_FRACTBITS_S - _FP_FRACBITS_S)
  47 #define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  48 #define _FP_WFRACXBITS_S        (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
  49 #define _FP_EXPBITS_S           8
  50 #define _FP_EXPBIAS_S           127
  51 #define _FP_EXPMAX_S            255
  52 #define _FP_QNANBIT_S           ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2))
  53 #define _FP_QNANBIT_SH_S        ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
  54 #define _FP_IMPLBIT_S           ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1))
  55 #define _FP_IMPLBIT_SH_S        ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
  56 #define _FP_OVERFLOW_S          ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_S))
  57
  58 #define _FP_WFRACBITS_DW_S      (2 * _FP_WFRACBITS_S)
  59 #define _FP_WFRACXBITS_DW_S     (_FP_FRACTBITS_DW_S - _FP_WFRACBITS_DW_S)
  60 #define _FP_HIGHBIT_DW_S        \
  61   ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_S - 1) % _FP_W_TYPE_SIZE)
  62
  63 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  64    chosen by the target machine.  */
  65
  66 typedef float SFtype __attribute__ ((mode (SF)));
  67
  68 union _FP_UNION_S
  69 {
  70   SFtype flt;
  71   struct _FP_STRUCT_LAYOUT
  72   {
  73 #if __BYTE_ORDER == __BIG_ENDIAN
  74     unsigned sign : 1;
  75     unsigned exp  : _FP_EXPBITS_S;
  76     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  77 #else
  78     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  79     unsigned exp  : _FP_EXPBITS_S;
  80     unsigned sign : 1;
  81 #endif
  82   } bits __attribute__ ((packed));
  83 };
  84
  85 #define FP_DECL_S(X)            _FP_DECL (1, X)
  86 #define FP_UNPACK_RAW_S(X, val) _FP_UNPACK_RAW_1 (S, X, (val))
  87 #define FP_UNPACK_RAW_SP(X, val)        _FP_UNPACK_RAW_1_P (S, X, (val))
  88 #define FP_PACK_RAW_S(val, X)   _FP_PACK_RAW_1 (S, (val), X)
  89 #define FP_PACK_RAW_SP(val, X)                  \
  90   do                                            \
  91     {                                           \
  92       if (!FP_INHIBIT_RESULTS)                  \
  93         _FP_PACK_RAW_1_P (S, (val), X);         \
  94     }                                           \
  95   while (0)
  96
  97 #define FP_UNPACK_S(X, val)                     \
  98   do                                            \
  99     {                                           \
 100       _FP_UNPACK_RAW_1 (S, X, (val));           \
 101       _FP_UNPACK_CANONICAL (S, 1, X);           \
 102     }                                           \
 103   while (0)
 104
 105 #define FP_UNPACK_SP(X, val)                    \
 106   do                                            \
 107     {                                           \
 108       _FP_UNPACK_RAW_1_P (S, X, (val));         \
 109       _FP_UNPACK_CANONICAL (S, 1, X);           \
 110     }                                           \
 111   while (0)
 112
 113 #define FP_UNPACK_SEMIRAW_S(X, val)             \
 114   do                                            \
 115     {                                           \
 116       _FP_UNPACK_RAW_1 (S, X, (val));           \
 117       _FP_UNPACK_SEMIRAW (S, 1, X);             \
 118     }                                           \
 119   while (0)
 120
 121 #define FP_UNPACK_SEMIRAW_SP(X, val)            \
 122   do                                            \
 123     {                                           \
 124       _FP_UNPACK_RAW_1_P (S, X, (val));         \
 125       _FP_UNPACK_SEMIRAW (S, 1, X);             \
 126     }                                           \
 127   while (0)
 128
 129 #define FP_PACK_S(val, X)                       \
 130   do                                            \
 131     {                                           \
 132       _FP_PACK_CANONICAL (S, 1, X);             \
 133       _FP_PACK_RAW_1 (S, (val), X);             \
 134     }                                           \
 135   while (0)
 136
 137 #define FP_PACK_SP(val, X)                      \
 138   do                                            \
 139     {                                           \
 140       _FP_PACK_CANONICAL (S, 1, X);             \
 141       if (!FP_INHIBIT_RESULTS)                  \
 142         _FP_PACK_RAW_1_P (S, (val), X);         \
 143     }                                           \
 144   while (0)
 145
 146 #define FP_PACK_SEMIRAW_S(val, X)               \
 147   do                                            \
 148     {                                           \
 149       _FP_PACK_SEMIRAW (S, 1, X);               \
 150       _FP_PACK_RAW_1 (S, (val), X);             \
 151     }                                           \
 152   while (0)
 153
 154 #define FP_PACK_SEMIRAW_SP(val, X)              \
 155   do                                            \
 156     {                                           \
 157       _FP_PACK_SEMIRAW (S, 1, X);               \
 158       if (!FP_INHIBIT_RESULTS)                  \
 159         _FP_PACK_RAW_1_P (S, (val), X);         \
 160     }                                           \
 161   while (0)
 162
 163 #define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN (S, 1, X)
 164 #define FP_NEG_S(R, X)                  _FP_NEG (S, 1, R, X)
 165 #define FP_ADD_S(R, X, Y)               _FP_ADD (S, 1, R, X, Y)
 166 #define FP_SUB_S(R, X, Y)               _FP_SUB (S, 1, R, X, Y)
 167 #define FP_MUL_S(R, X, Y)               _FP_MUL (S, 1, R, X, Y)
 168 #define FP_DIV_S(R, X, Y)               _FP_DIV (S, 1, R, X, Y)
 169 #define FP_SQRT_S(R, X)                 _FP_SQRT (S, 1, R, X)
 170 #define _FP_SQRT_MEAT_S(R, S, T, X, Q)  _FP_SQRT_MEAT_1 (R, S, T, X, (Q))
 171
 172 #if _FP_W_TYPE_SIZE < 64
 173 # define FP_FMA_S(R, X, Y, Z)   _FP_FMA (S, 1, 2, R, X, Y, Z)
 174 #else
 175 # define FP_FMA_S(R, X, Y, Z)   _FP_FMA (S, 1, 1, R, X, Y, Z)
 176 #endif
 177
 178 #define FP_CMP_S(r, X, Y, un, ex)       _FP_CMP (S, 1, (r), X, Y, (un), (ex))
 179 #define FP_CMP_EQ_S(r, X, Y, ex)        _FP_CMP_EQ (S, 1, (r), X, Y, (ex))
 180 #define FP_CMP_UNORD_S(r, X, Y, ex)     _FP_CMP_UNORD (S, 1, (r), X, Y, (ex))
 181
 182 #define FP_TO_INT_S(r, X, rsz, rsg)     _FP_TO_INT (S, 1, (r), X, (rsz), (rsg))
 183 #define FP_TO_INT_ROUND_S(r, X, rsz, rsg)       \
 184   _FP_TO_INT_ROUND (S, 1, (r), X, (rsz), (rsg))
 185 #define FP_FROM_INT_S(X, r, rs, rt)     _FP_FROM_INT (S, 1, X, (r), (rs), rt)
 186
 187 #define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1 (X)
 188 #define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1 (X)
 189
 190 #if _FP_W_TYPE_SIZE < 64
 191 # define _FP_FRAC_HIGH_DW_S(X)  _FP_FRAC_HIGH_2 (X)
 192 #else
 193 # define _FP_FRAC_HIGH_DW_S(X)  _FP_FRAC_HIGH_1 (X)
 194 #endif