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

   Copyright (C) 2000-2018 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

   three 32 bit ints.  */

#if __FLOAT_WORD_ORDER == __BIG_ENDIAN

typedef union

{

  long double value;

  struct

  {

    unsigned int empty0:32;

    int sign_exponent:16;

    unsigned int empty1:16;

    uint32_t msw;

    uint32_t lsw;

  } parts;

} ieee_long_double_shape_type;

#endif

#if __FLOAT_WORD_ORDER == __LITTLE_ENDIAN

typedef union

{

  long double value;

  struct

  {

    uint32_t lsw;

    uint32_t msw;

    int sign_exponent:16;

    unsigned int empty1:16;

    unsigned int empty0:32;

  } parts;

} ieee_long_double_shape_type;

#endif

/* Get three 32 bit ints from a double.  */

#define GET_LDOUBLE_WORDS(exp,ix0,ix1,d)			\

do {								\

  ieee_long_double_shape_type ew_u;				\

  ew_u.value = (d);						\

  (exp) = ew_u.parts.sign_exponent;				\

  (ix0) = ew_u.parts.msw;					\

  (ix1) = ew_u.parts.lsw;					\

} while (0)

/* Set a double from two 32 bit ints.  */

#define SET_LDOUBLE_WORDS(d,exp,ix0,ix1)			\

do {								\

  ieee_long_double_shape_type iw_u;				\

  iw_u.parts.sign_exponent = (exp);				\

  iw_u.parts.msw = (ix0);					\

  iw_u.parts.lsw = (ix1);					\

  (d) = iw_u.value;						\

} while (0)

/* Get the more significant 32 bits of a long double mantissa.  */

#define GET_LDOUBLE_MSW(v,d)					\

do {								\

  ieee_long_double_shape_type sh_u;				\

  sh_u.value = (d);						\

  (v) = sh_u.parts.msw;						\

} while (0)

/* Set the more significant 32 bits of a long double mantissa from an int.  */

#define SET_LDOUBLE_MSW(d,v)					\

do {								\

  ieee_long_double_shape_type sh_u;				\

  sh_u.value = (d);						\

  sh_u.parts.msw = (v);						\

  (d) = sh_u.value;						\

} while (0)

/* Get int from the exponent of a long double.  */

#define GET_LDOUBLE_EXP(exp,d)					\

do {								\

  ieee_long_double_shape_type ge_u;				\

  ge_u.value = (d);						\

  (exp) = ge_u.parts.sign_exponent;				\

} while (0)

/* Set exponent of a long double from an int.  */

#define SET_LDOUBLE_EXP(d,exp)					\

do {								\

  ieee_long_double_shape_type se_u;				\

  se_u.value = (d);						\

  se_u.parts.sign_exponent = (exp);				\

  (d) = se_u.value;						\

} while (0)

#endif /* math_ldbl.h */