linux/include/math-emu/single.h
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   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 Library General Public License as
  12   published by the Free Software Foundation; either version 2 of the
  13   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   Library General Public License for more details.
  19
  20   You should have received a copy of the GNU Library General Public
  21   License along with the GNU C Library; see the file COPYING.LIB.  If
  22   not, write to the Free Software Foundation, Inc.,
  23   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25#ifndef    __MATH_EMU_SINGLE_H__
  26#define    __MATH_EMU_SINGLE_H__
  27
  28#if _FP_W_TYPE_SIZE < 32
  29#error "Here's a nickel kid.  Go buy yourself a real computer."
  30#endif
  31
  32#define _FP_FRACBITS_S          24
  33#define _FP_FRACXBITS_S         (_FP_W_TYPE_SIZE - _FP_FRACBITS_S)
  34#define _FP_WFRACBITS_S         (_FP_WORKBITS + _FP_FRACBITS_S)
  35#define _FP_WFRACXBITS_S        (_FP_W_TYPE_SIZE - _FP_WFRACBITS_S)
  36#define _FP_EXPBITS_S           8
  37#define _FP_EXPBIAS_S           127
  38#define _FP_EXPMAX_S            255
  39#define _FP_QNANBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
  40#define _FP_IMPLBIT_S           ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
  41#define _FP_OVERFLOW_S          ((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
  42
  43/* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
  44   chosen by the target machine.  */
  45
  46union _FP_UNION_S
  47{
  48  float flt;
  49  struct {
  50#if __BYTE_ORDER == __BIG_ENDIAN
  51    unsigned sign : 1;
  52    unsigned exp  : _FP_EXPBITS_S;
  53    unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  54#else
  55    unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
  56    unsigned exp  : _FP_EXPBITS_S;
  57    unsigned sign : 1;
  58#endif
  59  } bits __attribute__((packed));
  60};
  61
  62#define FP_DECL_S(X)            _FP_DECL(1,X)
  63#define FP_UNPACK_RAW_S(X,val)  _FP_UNPACK_RAW_1(S,X,val)
  64#define FP_UNPACK_RAW_SP(X,val) _FP_UNPACK_RAW_1_P(S,X,val)
  65#define FP_PACK_RAW_S(val,X)    _FP_PACK_RAW_1(S,val,X)
  66#define FP_PACK_RAW_SP(val,X)           \
  67  do {                                  \
  68    if (!FP_INHIBIT_RESULTS)            \
  69      _FP_PACK_RAW_1_P(S,val,X);        \
  70  } while (0)
  71
  72#define FP_UNPACK_S(X,val)              \
  73  do {                                  \
  74    _FP_UNPACK_RAW_1(S,X,val);          \
  75    _FP_UNPACK_CANONICAL(S,1,X);        \
  76  } while (0)
  77
  78#define FP_UNPACK_SP(X,val)             \
  79  do {                                  \
  80    _FP_UNPACK_RAW_1_P(S,X,val);        \
  81    _FP_UNPACK_CANONICAL(S,1,X);        \
  82  } while (0)
  83
  84#define FP_PACK_S(val,X)                \
  85  do {                                  \
  86    _FP_PACK_CANONICAL(S,1,X);          \
  87    _FP_PACK_RAW_1(S,val,X);            \
  88  } while (0)
  89
  90#define FP_PACK_SP(val,X)               \
  91  do {                                  \
  92    _FP_PACK_CANONICAL(S,1,X);          \
  93    if (!FP_INHIBIT_RESULTS)            \
  94      _FP_PACK_RAW_1_P(S,val,X);        \
  95  } while (0)
  96
  97#define FP_ISSIGNAN_S(X)                _FP_ISSIGNAN(S,1,X)
  98#define FP_NEG_S(R,X)                   _FP_NEG(S,1,R,X)
  99#define FP_ADD_S(R,X,Y)                 _FP_ADD(S,1,R,X,Y)
 100#define FP_SUB_S(R,X,Y)                 _FP_SUB(S,1,R,X,Y)
 101#define FP_MUL_S(R,X,Y)                 _FP_MUL(S,1,R,X,Y)
 102#define FP_DIV_S(R,X,Y)                 _FP_DIV(S,1,R,X,Y)
 103#define FP_SQRT_S(R,X)                  _FP_SQRT(S,1,R,X)
 104#define _FP_SQRT_MEAT_S(R,S,T,X,Q)      _FP_SQRT_MEAT_1(R,S,T,X,Q)
 105
 106#define FP_CMP_S(r,X,Y,un)      _FP_CMP(S,1,r,X,Y,un)
 107#define FP_CMP_EQ_S(r,X,Y)      _FP_CMP_EQ(S,1,r,X,Y)
 108
 109#define FP_TO_INT_S(r,X,rsz,rsg)        _FP_TO_INT(S,1,r,X,rsz,rsg)
 110#define FP_TO_INT_ROUND_S(r,X,rsz,rsg)  _FP_TO_INT_ROUND(S,1,r,X,rsz,rsg)
 111#define FP_FROM_INT_S(X,r,rs,rt)        _FP_FROM_INT(S,1,X,r,rs,rt)
 112
 113#define _FP_FRAC_HIGH_S(X)      _FP_FRAC_HIGH_1(X)
 114#define _FP_FRAC_HIGH_RAW_S(X)  _FP_FRAC_HIGH_1(X)
 115
 116#endif /* __MATH_EMU_SINGLE_H__ */
 117
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