/* Manipulation of the bit representation of 'long double' quantities.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _MATH_LDBL_H_

#define _MATH_LDBL_H_ 1

#include <stdint.h>

#include <endian.h>

/* A union which permits us to convert between a long double and

   four 32 bit ints or two 64 bit ints.  */

#if __FLOAT_WORD_ORDER == __BIG_ENDIAN

typedef union

{

  long double value;

  struct

  {

    uint64_t msw;

    uint64_t lsw;

  } parts64;

  struct

  {

    uint32_t w0, w1, w2, w3;

  } parts32;

} ieee854_long_double_shape_type;

#endif

#if __FLOAT_WORD_ORDER == __LITTLE_ENDIAN

typedef union

{

  long double value;

  struct

  {

    uint64_t lsw;

    uint64_t msw;

  } parts64;

  struct

  {

    uint32_t w3, w2, w1, w0;

  } parts32;

} ieee854_long_double_shape_type;

#endif

/* Get two 64 bit ints from a long double.  */

#define GET_LDOUBLE_WORDS64(ix0,ix1,d)				\

do {								\

  ieee854_long_double_shape_type qw_u;				\

  qw_u.value = (d);						\

  (ix0) = qw_u.parts64.msw;					\

  (ix1) = qw_u.parts64.lsw;					\

} while (0)

/* Set a long double from two 64 bit ints.  */

#define SET_LDOUBLE_WORDS64(d,ix0,ix1)				\

do {								\

  ieee854_long_double_shape_type qw_u;				\

  qw_u.parts64.msw = (ix0);					\

  qw_u.parts64.lsw = (ix1);					\

  (d) = qw_u.value;						\

} while (0)

/* Get the more significant 64 bits of a long double mantissa.  */

#define GET_LDOUBLE_MSW64(v,d)					\

do {								\

  ieee854_long_double_shape_type sh_u;				\

  sh_u.value = (d);						\

  (v) = sh_u.parts64.msw;					\

} while (0)

/* Set the more significant 64 bits of a long double mantissa from an int.  */

#define SET_LDOUBLE_MSW64(d,v)					\

do {								\

  ieee854_long_double_shape_type sh_u;				\

  sh_u.value = (d);						\

  sh_u.parts64.msw = (v);					\

  (d) = sh_u.value;						\

} while (0)

/* Get the least significant 64 bits of a long double mantissa.  */

#define GET_LDOUBLE_LSW64(v,d)					\

do {								\

  ieee854_long_double_shape_type sh_u;				\

  sh_u.value = (d);						\

  (v) = sh_u.parts64.lsw;					\

} while (0)

/*

   On a platform already supporting a binary128 long double,

   _Float128 will alias to long double.  This transformation

   makes aliasing *l functions to *f128 trivial.

*/

#define _Float128 long double

#define L(x) x##L

#endif /* math_ldbl.h */