soft-fp/single.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Single Precision.
   3    Copyright (C) 1997,1998,1999,2006 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 #define _FP_FRACBITS_S          24
  40 #define _FP_FRACXBITS_S         (_FP_FRACTBITS_S - _FP_FRACBITS_S)
  41 #define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  42 #define _FP_WFRACXBITS_S        (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
  43 #define _FP_EXPBITS_S           8
  44 #define _FP_EXPBIAS_S           127
  45 #define _FP_EXPMAX_S            255
  46 #define _FP_QNANBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
  47 #define _FP_QNANBIT_SH_S        ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
  48 #define _FP_IMPLBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
  49 #define _FP_IMPLBIT_SH_S        ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
  50 #define _FP_OVERFLOW_S          ((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
  51
  52 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  53    chosen by the target machine.  */
  54
  55 typedef float SFtype __attribute__((mode(SF)));
  56
  57 union _FP_UNION_S
  58 {
  59   SFtype flt;
  60   struct {
  61 #if __BYTE_ORDER == __BIG_ENDIAN
  62     unsigned sign : 1;
  63     unsigned exp  : _FP_EXPBITS_S;
  64     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  65 #else
  66     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  67     unsigned exp  : _FP_EXPBITS_S;
  68     unsigned sign : 1;
  69 #endif
  70   } bits __attribute__((packed));
  71 };
  72
  73 #define FP_DECL_S(X)            _FP_DECL(1,X)
  74 #define FP_UNPACK_RAW_S(X,val)  _FP_UNPACK_RAW_1(S,X,val)
  75 #define FP_UNPACK_RAW_SP(X,val) _FP_UNPACK_RAW_1_P(S,X,val)
  76 #define FP_PACK_RAW_S(val,X)    _FP_PACK_RAW_1(S,val,X)
  77 #define FP_PACK_RAW_SP(val,X)           \
  78   do {                                  \
  79     if (!FP_INHIBIT_RESULTS)            \
  80       _FP_PACK_RAW_1_P(S,val,X);        \
  81   } while (0)
  82
  83 #define FP_UNPACK_S(X,val)              \
  84   do {                                  \
  85     _FP_UNPACK_RAW_1(S,X,val);          \
  86     _FP_UNPACK_CANONICAL(S,1,X);        \
  87   } while (0)
  88
  89 #define FP_UNPACK_SP(X,val)             \
  90   do {                                  \
  91     _FP_UNPACK_RAW_1_P(S,X,val);        \
  92     _FP_UNPACK_CANONICAL(S,1,X);        \
  93   } while (0)
  94
  95 #define FP_UNPACK_SEMIRAW_S(X,val)      \
  96   do {                                  \
  97     _FP_UNPACK_RAW_1(S,X,val);          \
  98     _FP_UNPACK_SEMIRAW(S,1,X);          \
  99   } while (0)
 100
 101 #define FP_UNPACK_SEMIRAW_SP(X,val)     \
 102   do {                                  \
 103     _FP_UNPACK_RAW_1_P(S,X,val);        \
 104     _FP_UNPACK_SEMIRAW(S,1,X);          \
 105   } while (0)
 106
 107 #define FP_PACK_S(val,X)                \
 108   do {                                  \
 109     _FP_PACK_CANONICAL(S,1,X);          \
 110     _FP_PACK_RAW_1(S,val,X);            \
 111   } while (0)
 112
 113 #define FP_PACK_SP(val,X)               \
 114   do {                                  \
 115     _FP_PACK_CANONICAL(S,1,X);          \
 116     if (!FP_INHIBIT_RESULTS)            \
 117       _FP_PACK_RAW_1_P(S,val,X);        \
 118   } while (0)
 119
 120 #define FP_PACK_SEMIRAW_S(val,X)        \
 121   do {                                  \
 122     _FP_PACK_SEMIRAW(S,1,X);            \
 123     _FP_PACK_RAW_1(S,val,X);            \
 124   } while (0)
 125
 126 #define FP_PACK_SEMIRAW_SP(val,X)       \
 127   do {                                  \
 128     _FP_PACK_SEMIRAW(S,1,X);            \
 129     if (!FP_INHIBIT_RESULTS)            \
 130       _FP_PACK_RAW_1_P(S,val,X);        \
 131   } while (0)
 132
 133 #define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN(S,1,X)
 134 #define FP_NEG_S(R,X)                   _FP_NEG(S,1,R,X)
 135 #define FP_ADD_S(R,X,Y)                 _FP_ADD(S,1,R,X,Y)
 136 #define FP_SUB_S(R,X,Y)                 _FP_SUB(S,1,R,X,Y)
 137 #define FP_MUL_S(R,X,Y)                 _FP_MUL(S,1,R,X,Y)
 138 #define FP_DIV_S(R,X,Y)                 _FP_DIV(S,1,R,X,Y)
 139 #define FP_SQRT_S(R,X)                  _FP_SQRT(S,1,R,X)
 140 #define _FP_SQRT_MEAT_S(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 141
 142 #define FP_CMP_S(r,X,Y,un)      _FP_CMP(S,1,r,X,Y,un)
 143 #define FP_CMP_EQ_S(r,X,Y)      _FP_CMP_EQ(S,1,r,X,Y)
 144 #define FP_CMP_UNORD_S(r,X,Y)   _FP_CMP_UNORD(S,1,r,X,Y)
 145
 146 #define FP_TO_INT_S(r,X,rsz,rsg)        _FP_TO_INT(S,1,r,X,rsz,rsg)
 147 #define FP_FROM_INT_S(X,r,rs,rt)        _FP_FROM_INT(S,1,X,r,rs,rt)
 148
 149 #define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1(X)
 150 #define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1(X)