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, write to the Free
  31    Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  32    MA 02110-1301, USA.  */
  33
  34 #if _FP_W_TYPE_SIZE < 32
  35 #error "Here's a nickel kid.  Go buy yourself a real computer."
  36 #endif
  37
  38 #define _FP_FRACTBITS_S         _FP_W_TYPE_SIZE
  39
  40 #define _FP_FRACBITS_S          24
  41 #define _FP_FRACXBITS_S         (_FP_FRACTBITS_S - _FP_FRACBITS_S)
  42 #define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  43 #define _FP_WFRACXBITS_S        (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
  44 #define _FP_EXPBITS_S           8
  45 #define _FP_EXPBIAS_S           127
  46 #define _FP_EXPMAX_S            255
  47 #define _FP_QNANBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
  48 #define _FP_QNANBIT_SH_S        ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
  49 #define _FP_IMPLBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
  50 #define _FP_IMPLBIT_SH_S        ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
  51 #define _FP_OVERFLOW_S          ((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
  52
  53 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  54    chosen by the target machine.  */
  55
  56 typedef float SFtype __attribute__((mode(SF)));
  57
  58 union _FP_UNION_S
  59 {
  60   SFtype flt;
  61   struct {
  62 #if __BYTE_ORDER == __BIG_ENDIAN
  63     unsigned sign : 1;
  64     unsigned exp  : _FP_EXPBITS_S;
  65     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  66 #else
  67     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  68     unsigned exp  : _FP_EXPBITS_S;
  69     unsigned sign : 1;
  70 #endif
  71   } bits __attribute__((packed));
  72 };
  73
  74 #define FP_DECL_S(X)            _FP_DECL(1,X)
  75 #define FP_UNPACK_RAW_S(X,val)  _FP_UNPACK_RAW_1(S,X,val)
  76 #define FP_UNPACK_RAW_SP(X,val) _FP_UNPACK_RAW_1_P(S,X,val)
  77 #define FP_PACK_RAW_S(val,X)    _FP_PACK_RAW_1(S,val,X)
  78 #define FP_PACK_RAW_SP(val,X)           \
  79   do {                                  \
  80     if (!FP_INHIBIT_RESULTS)            \
  81       _FP_PACK_RAW_1_P(S,val,X);        \
  82   } while (0)
  83
  84 #define FP_UNPACK_S(X,val)              \
  85   do {                                  \
  86     _FP_UNPACK_RAW_1(S,X,val);          \
  87     _FP_UNPACK_CANONICAL(S,1,X);        \
  88   } while (0)
  89
  90 #define FP_UNPACK_SP(X,val)             \
  91   do {                                  \
  92     _FP_UNPACK_RAW_1_P(S,X,val);        \
  93     _FP_UNPACK_CANONICAL(S,1,X);        \
  94   } while (0)
  95
  96 #define FP_UNPACK_SEMIRAW_S(X,val)      \
  97   do {                                  \
  98     _FP_UNPACK_RAW_1(S,X,val);          \
  99     _FP_UNPACK_SEMIRAW(S,1,X);          \
 100   } while (0)
 101
 102 #define FP_UNPACK_SEMIRAW_SP(X,val)     \
 103   do {                                  \
 104     _FP_UNPACK_RAW_1_P(S,X,val);        \
 105     _FP_UNPACK_SEMIRAW(S,1,X);          \
 106   } while (0)
 107
 108 #define FP_PACK_S(val,X)                \
 109   do {                                  \
 110     _FP_PACK_CANONICAL(S,1,X);          \
 111     _FP_PACK_RAW_1(S,val,X);            \
 112   } while (0)
 113
 114 #define FP_PACK_SP(val,X)               \
 115   do {                                  \
 116     _FP_PACK_CANONICAL(S,1,X);          \
 117     if (!FP_INHIBIT_RESULTS)            \
 118       _FP_PACK_RAW_1_P(S,val,X);        \
 119   } while (0)
 120
 121 #define FP_PACK_SEMIRAW_S(val,X)        \
 122   do {                                  \
 123     _FP_PACK_SEMIRAW(S,1,X);            \
 124     _FP_PACK_RAW_1(S,val,X);            \
 125   } while (0)
 126
 127 #define FP_PACK_SEMIRAW_SP(val,X)       \
 128   do {                                  \
 129     _FP_PACK_SEMIRAW(S,1,X);            \
 130     if (!FP_INHIBIT_RESULTS)            \
 131       _FP_PACK_RAW_1_P(S,val,X);        \
 132   } while (0)
 133
 134 #define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN(S,1,X)
 135 #define FP_NEG_S(R,X)                   _FP_NEG(S,1,R,X)
 136 #define FP_ADD_S(R,X,Y)                 _FP_ADD(S,1,R,X,Y)
 137 #define FP_SUB_S(R,X,Y)                 _FP_SUB(S,1,R,X,Y)
 138 #define FP_MUL_S(R,X,Y)                 _FP_MUL(S,1,R,X,Y)
 139 #define FP_DIV_S(R,X,Y)                 _FP_DIV(S,1,R,X,Y)
 140 #define FP_SQRT_S(R,X)                  _FP_SQRT(S,1,R,X)
 141 #define _FP_SQRT_MEAT_S(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 142
 143 #define FP_CMP_S(r,X,Y,un)      _FP_CMP(S,1,r,X,Y,un)
 144 #define FP_CMP_EQ_S(r,X,Y)      _FP_CMP_EQ(S,1,r,X,Y)
 145 #define FP_CMP_UNORD_S(r,X,Y)   _FP_CMP_UNORD(S,1,r,X,Y)
 146
 147 #define FP_TO_INT_S(r,X,rsz,rsg)        _FP_TO_INT(S,1,r,X,rsz,rsg)
 148 #define FP_FROM_INT_S(X,r,rs,rt)        _FP_FROM_INT(S,1,X,r,rs,rt)
 149
 150 #define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1(X)
 151 #define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1(X)