/*	$OpenBSD: math_private.h,v 1.17 2014/06/02 19:31:17 kettenis Exp $	*/
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
 * from: @(#)fdlibm.h 5.1 93/09/24
 */

#ifndef _MATH_PRIVATE_OPENBSD_H_
#define _MATH_PRIVATE_OPENBSD_H_

#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__

typedef union
{
  long double value;
  struct {
    u_int32_t mswhi;
    u_int32_t mswlo;
    u_int32_t lswhi;
    u_int32_t lswlo;
  } parts32;
  struct {
    u_int64_t msw;
    u_int64_t lsw;
  } parts64;
} ieee_quad_shape_type;

#endif

#if __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__

typedef union
{
  long double value;
  struct {
    u_int32_t lswlo;
    u_int32_t lswhi;
    u_int32_t mswlo;
    u_int32_t mswhi;
  } parts32;
  struct {
    u_int64_t lsw;
    u_int64_t msw;
  } parts64;
} ieee_quad_shape_type;

#endif

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

#define GET_LDOUBLE_WORDS64(ix0,ix1,d)				\
do {								\
  ieee_quad_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 {								\
  ieee_quad_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 {								\
  ieee_quad_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 {								\
  ieee_quad_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 {								\
  ieee_quad_shape_type sh_u;					\
  sh_u.value = (d);						\
  (v) = sh_u.parts64.lsw;					\
} while (0)

/* A union which permits us to convert between a long double and
   three 32 bit ints.  */

#if __FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__

typedef union
{
  long double value;
  struct {
#ifdef __LP64__
    int padh:32;
#endif
    int exp:16;
    int padl:16;
    u_int32_t msw;
    u_int32_t lsw;
  } parts;
} ieee_extended_shape_type;

#endif

#if __FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__

typedef union
{
  long double value;
  struct {
    u_int32_t lsw;
    u_int32_t msw;
    int exp:16;
    int padl:16;
#ifdef __LP64__
    int padh:32;
#endif
  } parts;
} ieee_extended_shape_type;

#endif

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

#define GET_LDOUBLE_WORDS(se,ix0,ix1,d)				\
do {								\
  ieee_extended_shape_type ew_u;				\
  ew_u.value = (d);						\
  (se) = ew_u.parts.exp;					\
  (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,se,ix0,ix1)				\
do {								\
  ieee_extended_shape_type iw_u;				\
  iw_u.parts.exp = (se);					\
  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_extended_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_extended_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(se,d)					\
do {								\
  ieee_extended_shape_type ge_u;				\
  ge_u.value = (d);						\
  (se) = ge_u.parts.exp;					\
} while (0)

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

#define SET_LDOUBLE_EXP(d,se)					\
do {								\
  ieee_extended_shape_type se_u;				\
  se_u.value = (d);						\
  se_u.parts.exp = (se);					\
  (d) = se_u.value;						\
} while (0)

/*
 * Common routine to process the arguments to nan(), nanf(), and nanl().
 */
void __scan_nan(uint32_t *__words, int __num_words, const char *__s);

/*
 * Functions internal to the math package, yet not static.
 */
double __exp__D(double, double);
struct Double __log__D(double);
long double __p1evll(long double, void *, int);
long double __polevll(long double, void *, int);

#endif /* _MATH_PRIVATE_OPENBSD_H_ */