soft-fp/single.h

   1 /* Software floating-point emulation.
   2    Definitions for IEEE Single Precision.
   3    Copyright (C) 1997,1998,1999 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    The GNU C Library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with the GNU C Library; if not, write to the Free
  22    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  23    02111-1307 USA.  */
  24
  25 #if _FP_W_TYPE_SIZE < 32
  26 #error "Here's a nickel kid.  Go buy yourself a real computer."
  27 #endif
  28
  29 #define _FP_FRACBITS_S          24
  30 #define _FP_FRACXBITS_S         (_FP_W_TYPE_SIZE - _FP_FRACBITS_S)
  31 #define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  32 #define _FP_WFRACXBITS_S        (_FP_W_TYPE_SIZE - _FP_WFRACBITS_S)
  33 #define _FP_EXPBITS_S           8
  34 #define _FP_EXPBIAS_S           127
  35 #define _FP_EXPMAX_S            255
  36 #define _FP_QNANBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
  37 #define _FP_IMPLBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
  38 #define _FP_OVERFLOW_S          ((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
  39
  40 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  41    chosen by the target machine.  */
  42
  43 union _FP_UNION_S
  44 {
  45   float flt;
  46   struct {
  47 #if __BYTE_ORDER == __BIG_ENDIAN
  48     unsigned sign : 1;
  49     unsigned exp  : _FP_EXPBITS_S;
  50     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  51 #else
  52     unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  53     unsigned exp  : _FP_EXPBITS_S;
  54     unsigned sign : 1;
  55 #endif
  56   } bits __attribute__((packed));
  57 };
  58
  59 #define FP_DECL_S(X)            _FP_DECL(1,X)
  60 #define FP_UNPACK_RAW_S(X,val)  _FP_UNPACK_RAW_1(S,X,val)
  61 #define FP_UNPACK_RAW_SP(X,val) _FP_UNPACK_RAW_1_P(S,X,val)
  62 #define FP_PACK_RAW_S(val,X)    _FP_PACK_RAW_1(S,val,X)
  63 #define FP_PACK_RAW_SP(val,X)           \
  64   do {                                  \
  65     if (!FP_INHIBIT_RESULTS)            \
  66       _FP_PACK_RAW_1_P(S,val,X);        \
  67   } while (0)
  68
  69 #define FP_UNPACK_S(X,val)              \
  70   do {                                  \
  71     _FP_UNPACK_RAW_1(S,X,val);          \
  72     _FP_UNPACK_CANONICAL(S,1,X);        \
  73   } while (0)
  74
  75 #define FP_UNPACK_SP(X,val)             \
  76   do {                                  \
  77     _FP_UNPACK_RAW_1_P(S,X,val);        \
  78     _FP_UNPACK_CANONICAL(S,1,X);        \
  79   } while (0)
  80
  81 #define FP_PACK_S(val,X)                \
  82   do {                                  \
  83     _FP_PACK_CANONICAL(S,1,X);          \
  84     _FP_PACK_RAW_1(S,val,X);            \
  85   } while (0)
  86
  87 #define FP_PACK_SP(val,X)               \
  88   do {                                  \
  89     _FP_PACK_CANONICAL(S,1,X);          \
  90     if (!FP_INHIBIT_RESULTS)            \
  91       _FP_PACK_RAW_1_P(S,val,X);        \
  92   } while (0)
  93
  94 #define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN(S,1,X)
  95 #define FP_NEG_S(R,X)                   _FP_NEG(S,1,R,X)
  96 #define FP_ADD_S(R,X,Y)                 _FP_ADD(S,1,R,X,Y)
  97 #define FP_SUB_S(R,X,Y)                 _FP_SUB(S,1,R,X,Y)
  98 #define FP_MUL_S(R,X,Y)                 _FP_MUL(S,1,R,X,Y)
  99 #define FP_DIV_S(R,X,Y)                 _FP_DIV(S,1,R,X,Y)
 100 #define FP_SQRT_S(R,X)                  _FP_SQRT(S,1,R,X)
 101 #define _FP_SQRT_MEAT_S(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 102
 103 #define FP_CMP_S(r,X,Y,un)      _FP_CMP(S,1,r,X,Y,un)
 104 #define FP_CMP_EQ_S(r,X,Y)      _FP_CMP_EQ(S,1,r,X,Y)
 105
 106 #define FP_TO_INT_S(r,X,rsz,rsg)        _FP_TO_INT(S,1,r,X,rsz,rsg)
 107 #define FP_FROM_INT_S(X,r,rs,rt)        _FP_FROM_INT(S,1,X,r,rs,rt)
 108
 109 #define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1(X)
 110 #define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1(X)