1. 根目录:
2. include
3. math-emu
4. quad.h

/* Software floating-point emulation.
   Definitions for IEEE Quad Precision.
   Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson (rth@cygnus.com),
		  Jakub Jelinek (jj@ultra.linux.cz),
		  David S. Miller (davem@redhat.com) and
		  Peter Maydell (pmaydell@chiark.greenend.org.uk).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If
   not, write to the Free Software Foundation, Inc.,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef  __MATH_EMU_QUAD_H__
#define  __MATH_EMU_QUAD_H__

#if _FP_W_TYPE_SIZE < 32
#error "Here's a nickel, kid. Go buy yourself a real computer."
#endif

#if _FP_W_TYPE_SIZE < 64
#define _FP_FRACTBITS_Q         (4*_FP_W_TYPE_SIZE)
#else
#define _FP_FRACTBITS_Q		(2*_FP_W_TYPE_SIZE)
#endif

#define _FP_FRACBITS_Q		113
#define _FP_FRACXBITS_Q		(_FP_FRACTBITS_Q - _FP_FRACBITS_Q)
#define _FP_WFRACBITS_Q		(_FP_WORKBITS + _FP_FRACBITS_Q)
#define _FP_WFRACXBITS_Q	(_FP_FRACTBITS_Q - _FP_WFRACBITS_Q)
#define _FP_EXPBITS_Q		15
#define _FP_EXPBIAS_Q		16383
#define _FP_EXPMAX_Q		32767

#define _FP_QNANBIT_Q		\
	((_FP_W_TYPE)1 << (_FP_FRACBITS_Q-2) % _FP_W_TYPE_SIZE)
#define _FP_IMPLBIT_Q		\
	((_FP_W_TYPE)1 << (_FP_FRACBITS_Q-1) % _FP_W_TYPE_SIZE)
#define _FP_OVERFLOW_Q		\
	((_FP_W_TYPE)1 << (_FP_WFRACBITS_Q % _FP_W_TYPE_SIZE))

#if _FP_W_TYPE_SIZE < 64

union _FP_UNION_Q
{
   long double flt;
   struct 
   {
#if __BYTE_ORDER == __BIG_ENDIAN
      unsigned sign : 1;
      unsigned exp : _FP_EXPBITS_Q;
      unsigned long frac3 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0)-(_FP_W_TYPE_SIZE * 3);
      unsigned long frac2 : _FP_W_TYPE_SIZE;
      unsigned long frac1 : _FP_W_TYPE_SIZE;
      unsigned long frac0 : _FP_W_TYPE_SIZE;
#else
      unsigned long frac0 : _FP_W_TYPE_SIZE;
      unsigned long frac1 : _FP_W_TYPE_SIZE;
      unsigned long frac2 : _FP_W_TYPE_SIZE;
      unsigned long frac3 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0)-(_FP_W_TYPE_SIZE * 3);
      unsigned exp : _FP_EXPBITS_Q;
      unsigned sign : 1;
#endif /* not bigendian */
   } bits __attribute__((packed));
};


#define FP_DECL_Q(X)		_FP_DECL(4,X)
#define FP_UNPACK_RAW_Q(X,val)	_FP_UNPACK_RAW_4(Q,X,val)
#define FP_UNPACK_RAW_QP(X,val)	_FP_UNPACK_RAW_4_P(Q,X,val)
#define FP_PACK_RAW_Q(val,X)	_FP_PACK_RAW_4(Q,val,X)
#define FP_PACK_RAW_QP(val,X)		\
  do {					\
    if (!FP_INHIBIT_RESULTS)		\
      _FP_PACK_RAW_4_P(Q,val,X);	\
  } while (0)

#define FP_UNPACK_Q(X,val)		\
  do {					\
    _FP_UNPACK_RAW_4(Q,X,val);		\
    _FP_UNPACK_CANONICAL(Q,4,X);	\
  } while (0)

#define FP_UNPACK_QP(X,val)		\
  do {					\
    _FP_UNPACK_RAW_4_P(Q,X,val);	\
    _FP_UNPACK_CANONICAL(Q,4,X);	\
  } while (0)

#define FP_PACK_Q(val,X)		\
  do {					\
    _FP_PACK_CANONICAL(Q,4,X);		\
    _FP_PACK_RAW_4(Q,val,X);		\
  } while (0)

#define FP_PACK_QP(val,X)		\
  do {					\
    _FP_PACK_CANONICAL(Q,4,X);		\
    if (!FP_INHIBIT_RESULTS)		\
      _FP_PACK_RAW_4_P(Q,val,X);	\
  } while (0)

#define FP_ISSIGNAN_Q(X)		_FP_ISSIGNAN(Q,4,X)
#define FP_NEG_Q(R,X)			_FP_NEG(Q,4,R,X)
#define FP_ADD_Q(R,X,Y)			_FP_ADD(Q,4,R,X,Y)
#define FP_SUB_Q(R,X,Y)			_FP_SUB(Q,4,R,X,Y)
#define FP_MUL_Q(R,X,Y)			_FP_MUL(Q,4,R,X,Y)
#define FP_DIV_Q(R,X,Y)			_FP_DIV(Q,4,R,X,Y)
#define FP_SQRT_Q(R,X)			_FP_SQRT(Q,4,R,X)
#define _FP_SQRT_MEAT_Q(R,S,T,X,Q)	_FP_SQRT_MEAT_4(R,S,T,X,Q)

#define FP_CMP_Q(r,X,Y,un)	_FP_CMP(Q,4,r,X,Y,un)
#define FP_CMP_EQ_Q(r,X,Y)	_FP_CMP_EQ(Q,4,r,X,Y)

#define FP_TO_INT_Q(r,X,rsz,rsg)	_FP_TO_INT(Q,4,r,X,rsz,rsg)
#define FP_TO_INT_ROUND_Q(r,X,rsz,rsg)	_FP_TO_INT_ROUND(Q,4,r,X,rsz,rsg)
#define FP_FROM_INT_Q(X,r,rs,rt)	_FP_FROM_INT(Q,4,X,r,rs,rt)

#define _FP_FRAC_HIGH_Q(X)	_FP_FRAC_HIGH_4(X)
#define _FP_FRAC_HIGH_RAW_Q(X)	_FP_FRAC_HIGH_4(X)

#else   /* not _FP_W_TYPE_SIZE < 64 */
union _FP_UNION_Q
{
  long double flt /* __attribute__((mode(TF))) */ ;
  struct {
#if __BYTE_ORDER == __BIG_ENDIAN
    unsigned sign  : 1;
    unsigned exp   : _FP_EXPBITS_Q;
    unsigned long frac1 : _FP_FRACBITS_Q-(_FP_IMPLBIT_Q != 0)-_FP_W_TYPE_SIZE;
    unsigned long frac0 : _FP_W_TYPE_SIZE;
#else
    unsigned long frac0 : _FP_W_TYPE_SIZE;
    unsigned long frac1 : _FP_FRACBITS_Q-(_FP_IMPLBIT_Q != 0)-_FP_W_TYPE_SIZE;
    unsigned exp   : _FP_EXPBITS_Q;
    unsigned sign  : 1;
#endif
  } bits;
};

#define FP_DECL_Q(X)		_FP_DECL(2,X)
#define FP_UNPACK_RAW_Q(X,val)	_FP_UNPACK_RAW_2(Q,X,val)
#define FP_UNPACK_RAW_QP(X,val)	_FP_UNPACK_RAW_2_P(Q,X,val)
#define FP_PACK_RAW_Q(val,X)	_FP_PACK_RAW_2(Q,val,X)
#define FP_PACK_RAW_QP(val,X)		\
  do {					\
    if (!FP_INHIBIT_RESULTS)		\
      _FP_PACK_RAW_2_P(Q,val,X);	\
  } while (0)

#define FP_UNPACK_Q(X,val)		\
  do {					\
    _FP_UNPACK_RAW_2(Q,X,val);		\
    _FP_UNPACK_CANONICAL(Q,2,X);	\
  } while (0)

#define FP_UNPACK_QP(X,val)		\
  do {					\
    _FP_UNPACK_RAW_2_P(Q,X,val);	\
    _FP_UNPACK_CANONICAL(Q,2,X);	\
  } while (0)

#define FP_PACK_Q(val,X)		\
  do {					\
    _FP_PACK_CANONICAL(Q,2,X);		\
    _FP_PACK_RAW_2(Q,val,X);		\
  } while (0)

#define FP_PACK_QP(val,X)		\
  do {					\
    _FP_PACK_CANONICAL(Q,2,X);		\
    if (!FP_INHIBIT_RESULTS)		\
      _FP_PACK_RAW_2_P(Q,val,X);	\
  } while (0)

#define FP_ISSIGNAN_Q(X)		_FP_ISSIGNAN(Q,2,X)
#define FP_NEG_Q(R,X)			_FP_NEG(Q,2,R,X)
#define FP_ADD_Q(R,X,Y)			_FP_ADD(Q,2,R,X,Y)
#define FP_SUB_Q(R,X,Y)			_FP_SUB(Q,2,R,X,Y)
#define FP_MUL_Q(R,X,Y)			_FP_MUL(Q,2,R,X,Y)
#define FP_DIV_Q(R,X,Y)			_FP_DIV(Q,2,R,X,Y)
#define FP_SQRT_Q(R,X)			_FP_SQRT(Q,2,R,X)
#define _FP_SQRT_MEAT_Q(R,S,T,X,Q)	_FP_SQRT_MEAT_2(R,S,T,X,Q)

#define FP_CMP_Q(r,X,Y,un)	_FP_CMP(Q,2,r,X,Y,un)
#define FP_CMP_EQ_Q(r,X,Y)	_FP_CMP_EQ(Q,2,r,X,Y)

#define FP_TO_INT_Q(r,X,rsz,rsg)	_FP_TO_INT(Q,2,r,X,rsz,rsg)
#define FP_TO_INT_ROUND_Q(r,X,rsz,rsg)	_FP_TO_INT_ROUND(Q,2,r,X,rsz,rsg)
#define FP_FROM_INT_Q(X,r,rs,rt)	_FP_FROM_INT(Q,2,X,r,rs,rt)

#define _FP_FRAC_HIGH_Q(X)	_FP_FRAC_HIGH_2(X)
#define _FP_FRAC_HIGH_RAW_Q(X)	_FP_FRAC_HIGH_2(X)

#endif /* not _FP_W_TYPE_SIZE < 64 */

#endif /* __MATH_EMU_QUAD_H__ */