/* Interface to replace gmp-impl.h

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Contributed by the Arenaire and Caramel projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR 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 3 of the License, or (at your
option) any later version.

The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER.  If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

#ifndef __GMPFR_GMP_H__
#define __GMPFR_GMP_H__

#ifndef __MPFR_IMPL_H__
# error  "mpfr-impl.h not included"
#endif

#include <limits.h> /* For INT_MAX, ... */
#include <string.h> /* For memcpy, memset and memmove */

/* The following tries to get a good version of alloca.
   See gmp-impl.h for implementation details and original version */
/* FIXME: the autoconf manual gives a different piece of code under the
   documentation of the AC_FUNC_ALLOCA macro. Should we switch to it? */
#ifndef alloca
# if defined ( __GNUC__ )
#  define alloca __builtin_alloca
# elif defined (__DECC)
#  define alloca(x) __ALLOCA(x)
# elif defined (_MSC_VER)
#  include <malloc.h>
#  define alloca _alloca
# elif defined (HAVE_ALLOCA_H)
#  include <alloca.h>
# elif defined (_AIX) || defined (_IBMR2)
#  pragma alloca
# else
void *alloca (size_t);
# endif
#endif

#if defined (__cplusplus)
extern "C" {
#endif

/* Define GMP_NUMB_BITS
   Can't use sizeof(mp_limb_t) since it should be a preprocessor constant */
#if defined(GMP_NUMB_BITS) /* GMP 4.1.2 or above */
#ifndef GMP_NUMB_BITS
# define GMP_NUMB_BITS  (GMP_NUMB_BITS+GMP_NAIL_BITS)
#endif
#elif defined (__GMP_GMP_NUMB_BITS) /* Older versions 4.x.x */
# define GMP_NUMB_BITS  __GMP_GMP_NUMB_BITS
# define GMP_NUMB_BITS GMP_NUMB_BITS
# ifndef GMP_NAIL_BITS
#  define GMP_NAIL_BITS 0
# endif
#else
# error "Could not detect GMP_NUMB_BITS. Try with gmp internal files."
#endif

/* Define some macros */
#define BYTES_PER_MP_LIMB (GMP_NUMB_BITS/CHAR_BIT)

#define MP_LIMB_T_MAX (~(mp_limb_t)0)

#define ULONG_HIGHBIT (ULONG_MAX ^ ((unsigned long) ULONG_MAX >> 1))
#define UINT_HIGHBIT  (UINT_MAX ^ ((unsigned) UINT_MAX >> 1))
#define USHRT_HIGHBIT ((unsigned short) (USHRT_MAX ^ ((unsigned short) USHRT_MAX >> 1)))

#define GMP_LIMB_HIGHBIT (MP_LIMB_T_MAX ^ (MP_LIMB_T_MAX >> 1))


#if __GMP_MP_SIZE_T_INT
#define MP_SIZE_T_MAX      INT_MAX
#define MP_SIZE_T_MIN      INT_MIN
#else
#define MP_SIZE_T_MAX      LONG_MAX
#define MP_SIZE_T_MIN      LONG_MIN
#endif

#define LONG_HIGHBIT       LONG_MIN
#define INT_HIGHBIT        INT_MIN
#define SHRT_HIGHBIT       SHRT_MIN

/* MP_LIMB macros */
#define MPN_ZERO(dst, n) memset((dst), 0, (n)*BYTES_PER_MP_LIMB)
#define MPN_COPY_DECR(dst,src,n) memmove((dst),(src),(n)*BYTES_PER_MP_LIMB)
#define MPN_COPY_INCR(dst,src,n) memmove((dst),(src),(n)*BYTES_PER_MP_LIMB)
#define MPN_COPY(dst,src,n) \
  do                                                                  \
    {                                                                 \
      if ((dst) != (src))                                             \
        {                                                             \
          MPFR_ASSERTD ((char *) (dst) >= (char *) (src) +            \
                                          (n) * BYTES_PER_MP_LIMB ||  \
                        (char *) (src) >= (char *) (dst) +            \
                                          (n) * BYTES_PER_MP_LIMB);   \
          memcpy ((dst), (src), (n) * BYTES_PER_MP_LIMB);             \
        }                                                             \
    }                                                                 \
  while (0)

/* MPN macros taken from gmp-impl.h */
#define MPN_NORMALIZE(DST, NLIMBS) \
  do {                                        \
    while (NLIMBS > 0)                        \
      {                                       \
        if ((DST)[(NLIMBS) - 1] != 0)         \
          break;                              \
        NLIMBS--;                             \
      }                                       \
  } while (0)
#define MPN_NORMALIZE_NOT_ZERO(DST, NLIMBS)     \
  do {                                          \
    MPFR_ASSERTD ((NLIMBS) >= 1);               \
    while (1)                                   \
      {                                         \
        if ((DST)[(NLIMBS) - 1] != 0)           \
          break;                                \
        NLIMBS--;                               \
      }                                         \
  } while (0)
#define MPN_OVERLAP_P(xp, xsize, yp, ysize) \
  ((xp) + (xsize) > (yp) && (yp) + (ysize) > (xp))
#define MPN_SAME_OR_INCR2_P(dst, dsize, src, ssize)             \
  ((dst) <= (src) || ! MPN_OVERLAP_P (dst, dsize, src, ssize))
#define MPN_SAME_OR_INCR_P(dst, src, size)      \
  MPN_SAME_OR_INCR2_P(dst, size, src, size)
#define MPN_SAME_OR_DECR2_P(dst, dsize, src, ssize)             \
  ((dst) >= (src) || ! MPN_OVERLAP_P (dst, dsize, src, ssize))
#define MPN_SAME_OR_DECR_P(dst, src, size)      \
  MPN_SAME_OR_DECR2_P(dst, size, src, size)

/* If mul_basecase or mpn_sqr_basecase are not exported, used mpn_mul instead */
#ifndef mpn_mul_basecase
# define mpn_mul_basecase(dst,s1,n1,s2,n2) mpn_mul((dst),(s1),(n1),(s2),(n2))
#endif
#ifndef mpn_sqr_basecase
# define mpn_sqr_basecase(dst,src,n) mpn_mul((dst),(src),(n),(src),(n))
#endif

/* ASSERT */
__MPFR_DECLSPEC void mpfr_assert_fail _MPFR_PROTO((const char *, int,
                                                   const char *));

#define ASSERT_FAIL(expr)  mpfr_assert_fail (__FILE__, __LINE__, #expr)
#define ASSERT(expr)       MPFR_ASSERTD(expr)

/* Access fileds of GMP struct */
#define SIZ(x) ((x)->_mp_size)
#define ABSIZ(x) ABS (SIZ (x))
#define PTR(x) ((x)->_mp_d)
#define LIMBS(x) ((x)->_mp_d)
#define EXP(x) ((x)->_mp_exp)
#define PREC(x) ((x)->_mp_prec)
#define ALLOC(x) ((x)->_mp_alloc)
#define MPZ_REALLOC(z,n) ((n) > ALLOC(z) ? _mpz_realloc(z,n) : PTR(z))

/* Non IEEE float supports -- needs to detect them with proper configure */
#undef  XDEBUG
#define XDEBUG

/* For longlong.h */
#ifdef HAVE_ATTRIBUTE_MODE
typedef unsigned int UQItype    __attribute__ ((mode (QI)));
typedef          int SItype     __attribute__ ((mode (SI)));
typedef unsigned int USItype    __attribute__ ((mode (SI)));
typedef          int DItype     __attribute__ ((mode (DI)));
typedef unsigned int UDItype    __attribute__ ((mode (DI)));
#else
typedef unsigned char UQItype;
typedef          long SItype;
typedef unsigned long USItype;
#ifdef HAVE_LONG_LONG
typedef long long int DItype;
typedef unsigned long long int UDItype;
#else /* Assume `long' gives us a wide enough type.  Needed for hppa2.0w.  */
typedef long int DItype;
typedef unsigned long int UDItype;
#endif
#endif
typedef mp_limb_t UWtype;
typedef unsigned int UHWtype;
#define W_TYPE_SIZE GMP_NUMB_BITS

/* Remap names of internal mpn functions (for longlong.h).  */
#undef  __clz_tab
#define __clz_tab               mpfr_clz_tab

/* Use (4.0 * ...) instead of (2.0 * ...) to work around buggy compilers
   that don't convert ulong->double correctly (eg. SunOS 4 native cc).  */
#undef MP_BASE_AS_DOUBLE
#define MP_BASE_AS_DOUBLE (4.0 * ((mp_limb_t) 1 << (GMP_NUMB_BITS - 2)))

/* Structure for conversion between internal binary format and
   strings in base 2..36.  */
struct bases
{
  /* log(2)/log(conversion_base) */
  double chars_per_bit_exactly;
};
#undef  __mp_bases
#define __mp_bases mpfr_bases
__MPFR_DECLSPEC extern const struct bases mpfr_bases[257];

/* Standard macros */
#undef ABS
#undef MIN
#undef MAX
#undef numberof
#define ABS(x) ((x) >= 0 ? (x) : -(x))
#define MIN(l,o) ((l) < (o) ? (l) : (o))
#define MAX(h,i) ((h) > (i) ? (h) : (i))
#define numberof(x)  (sizeof (x) / sizeof ((x)[0]))

/* Random */
#undef  __gmp_rands_initialized
#undef  __gmp_rands
#define __gmp_rands_initialized mpfr_rands_initialized
#define __gmp_rands             mpfr_rands

__MPFR_DECLSPEC extern char             mpfr_rands_initialized;
__MPFR_DECLSPEC extern gmp_randstate_t  mpfr_rands;

#undef RANDS
#define RANDS                                   \
  ((__gmp_rands_initialized ? 0                 \
    : (__gmp_rands_initialized = 1,             \
       gmp_randinit_default (__gmp_rands), 0)), \
   __gmp_rands)

#undef RANDS_CLEAR
#define RANDS_CLEAR()                   \
  do {                                  \
    if (__gmp_rands_initialized)        \
      {                                 \
        __gmp_rands_initialized = 0;    \
        gmp_randclear (__gmp_rands);    \
      }                                 \
  } while (0)

typedef __gmp_randstate_struct *gmp_randstate_ptr;

/* Allocate func are defined in gmp-impl.h */

/* In newer GMP, there aren't anymore __gmp_allocate_func,
   __gmp_reallocate_func & __gmp_free_func in gmp.h
   Just getting the correct value by calling mp_get_memory_functions */
#ifdef mp_get_memory_functions

#undef __gmp_allocate_func
#undef __gmp_reallocate_func
#undef __gmp_free_func
#define MPFR_GET_MEMFUNC mp_get_memory_functions(&mpfr_allocate_func, &mpfr_reallocate_func, &mpfr_free_func)
#define __gmp_allocate_func   (MPFR_GET_MEMFUNC, mpfr_allocate_func)
#define __gmp_reallocate_func (MPFR_GET_MEMFUNC, mpfr_reallocate_func)
#define __gmp_free_func       (MPFR_GET_MEMFUNC, mpfr_free_func)
__MPFR_DECLSPEC extern void * (*mpfr_allocate_func)   _MPFR_PROTO ((size_t));
__MPFR_DECLSPEC extern void * (*mpfr_reallocate_func) _MPFR_PROTO ((void *,
                                                          size_t, size_t));
__MPFR_DECLSPEC extern void   (*mpfr_free_func)       _MPFR_PROTO ((void *,
                                                                    size_t));

#endif

#undef __gmp_default_allocate
#undef __gmp_default_reallocate
#undef __gmp_default_free
#define __gmp_default_allocate   mpfr_default_allocate
#define __gmp_default_reallocate mpfr_default_reallocate
#define __gmp_default_free       mpfr_default_free
__MPFR_DECLSPEC void *__gmp_default_allocate _MPFR_PROTO ((size_t));
__MPFR_DECLSPEC void *__gmp_default_reallocate _MPFR_PROTO ((void *, size_t,
                                                             size_t));
__MPFR_DECLSPEC void __gmp_default_free _MPFR_PROTO ((void *, size_t));

#if defined(WANT_GMP_INTERNALS) && defined(HAVE___GMPN_ROOTREM)
#ifndef __gmpn_rootrem
  __MPFR_DECLSPEC mp_size_t __gmpn_rootrem _MPFR_PROTO ((mp_limb_t*,
                    mp_limb_t*, mp_limb_t*, mp_size_t, mp_limb_t));
#endif
#endif

#if defined(WANT_GMP_INTERNALS) && defined(HAVE___GMPN_SBPI1_DIVAPPR_Q)
#ifndef __gmpn_sbpi1_divappr_q
  __MPFR_DECLSPEC mp_limb_t __gmpn_sbpi1_divappr_q _MPFR_PROTO ((mp_limb_t*,
                mp_limb_t*, mp_size_t, mp_limb_t*, mp_size_t, mp_limb_t));
#endif
#endif

/* Temp memory allocate */

struct tmp_marker
{
  void *ptr;
  size_t size;
  struct tmp_marker *next;
};

__MPFR_DECLSPEC void *mpfr_tmp_allocate _MPFR_PROTO ((struct tmp_marker **,
                                                      size_t));
__MPFR_DECLSPEC void mpfr_tmp_free _MPFR_PROTO ((struct tmp_marker *));

/* Do not define TMP_SALLOC (see the test in mpfr-impl.h)! */
#define TMP_ALLOC(n) (MPFR_LIKELY ((n) < 16384) ?       \
                      alloca (n) : mpfr_tmp_allocate (&tmp_marker, (n)))
#define TMP_DECL(m) struct tmp_marker *tmp_marker
#define TMP_MARK(m) (tmp_marker = 0)
#define TMP_FREE(m) mpfr_tmp_free (tmp_marker)

/* invert_limb macro, copied from GMP 5.0.2, file gmp-impl.h.
   It returns invxl = floor((B^2-1)/xl)-B, where B=2^BITS_PER_LIMB,
   assuming the most significant bit of xl is set. */
#undef invert_limb
#define invert_limb(invxl,xl)                             \
  do {                                                    \
    mp_limb_t dummy;                                      \
    MPFR_ASSERTD ((xl) != 0);                             \
    udiv_qrnnd (invxl, dummy, ~(xl), ~(mp_limb_t)0, xl);  \
  } while (0)

typedef struct {mp_limb_t inv32;} mpfr_pi1_t; /* We changed gmp_pi1_t into
                                                 mpfr_pi1_t to avoid using
                                                 GMP's namespace. */
/* invert_pi1 macro, adapted from GMP 5.0.2, file gmp-impl.h.
   It returns dinv = floor((B^3-1)/(d1*B+d0))-B, where B=2^BITS_PER_LIMB,
   assuming the most significant bit of d1 is set. */
#undef invert_pi1
#define invert_pi1(dinv, d1, d0)                                \
  do {                                                          \
    mp_limb_t _v, _p, _t1, _t0, _mask;                          \
    invert_limb (_v, d1);                                       \
    _p = d1 * _v;                                               \
    _p += d0;                                                   \
    if (_p < d0)                                                \
      {                                                         \
        _v--;                                                   \
        _mask = -(_p >= d1);                                    \
        _p -= d1;                                               \
        _v += _mask;                                            \
        _p -= _mask & d1;                                       \
      }                                                         \
    umul_ppmm (_t1, _t0, d0, _v);                               \
    _p += _t1;                                                  \
    if (_p < _t1)                                               \
      {                                                         \
        _v--;                                                   \
        if (MPFR_UNLIKELY (_p >= d1))                           \
          {                                                     \
            if (_p > d1 || _t0 >= d0)                           \
              _v--;                                             \
          }                                                     \
      }                                                         \
    (dinv).inv32 = _v;                                          \
  } while (0)

/* udiv_qr_3by2 macro, adapted from GMP 5.0.2, file gmp-impl.h.
   Compute quotient the quotient and remainder for n / d. Requires d
   >= B^2 / 2 and n < d B. dinv is the inverse

     floor ((B^3 - 1) / (d0 + d1 B)) - B.

   NOTE: Output variables are updated multiple times. Only some inputs
   and outputs may overlap.
*/
#undef udiv_qr_3by2
#define udiv_qr_3by2(q, r1, r0, n2, n1, n0, d1, d0, dinv)               \
  do {                                                                  \
    mp_limb_t _q0, _t1, _t0, _mask;                                     \
    umul_ppmm ((q), _q0, (n2), (dinv));                                 \
    add_ssaaaa ((q), _q0, (q), _q0, (n2), (n1));                        \
                                                                        \
    /* Compute the two most significant limbs of n - q'd */             \
    (r1) = (n1) - (d1) * (q);                                           \
    (r0) = (n0);                                                        \
    sub_ddmmss ((r1), (r0), (r1), (r0), (d1), (d0));                    \
    umul_ppmm (_t1, _t0, (d0), (q));                                    \
    sub_ddmmss ((r1), (r0), (r1), (r0), _t1, _t0);                      \
    (q)++;                                                              \
                                                                        \
    /* Conditionally adjust q and the remainders */                     \
    _mask = - (mp_limb_t) ((r1) >= _q0);                                \
    (q) += _mask;                                                       \
    add_ssaaaa ((r1), (r0), (r1), (r0), _mask & (d1), _mask & (d0));    \
    if (MPFR_UNLIKELY ((r1) >= (d1)))                                   \
      {                                                                 \
        if ((r1) > (d1) || (r0) >= (d0))                                \
          {                                                             \
            (q)++;                                                      \
            sub_ddmmss ((r1), (r0), (r1), (r0), (d1), (d0));            \
          }                                                             \
      }                                                                 \
  } while (0)

#if defined (__cplusplus)
}
#endif

#endif /* Gmp internal emulator */
