/* auxiliary functions for MPFR tests.

Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.

This file is part of the MPFR Library.

The 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 2.1 of the License, or (at your
option) any later version.

The 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 MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */

#ifndef __MPFR_TEST_H__
#define __MPFR_TEST_H__

#include <stdio.h>

#include "mpfr-impl.h"

/* generates a random long int, a random double,
   and corresponding seed initializing */
#define DBL_RAND() ((double) randlimb() / (double) MP_LIMB_T_MAX)

#define MINNORM 2.2250738585072013831e-308 /* 2^(-1022), smallest normalized */
#define MAXNORM 1.7976931348623157081e308 /* 2^(1023)*(2-2^(-52)) */

/* Generates a random rounding mode */
#define RND_RAND() (randlimb() % GMP_RND_MAX)

/* Generates a random sign */
#define SIGN_RAND() ( (randlimb()%2) ? MPFR_SIGN_POS : MPFR_SIGN_NEG)

/* Loop for all rounding modes */
#define RND_LOOP(_r) for((_r) = 0 ; (_r) < GMP_RND_MAX ; (_r)++)

/* The MAX, MIN and ABS macros may already be defined if gmp-impl.h has
   been included. They have the same semantics as in gmp-impl.h, but the
   expressions may be slightly different. So, it's better to undefine
   them first, as required by the ISO C standard. */
#undef MAX
#undef MIN
#undef ABS
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define ABS(x) (((x)>0) ? (x) : -(x))

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

void tests_memory_start _MPFR_PROTO ((void));
void tests_memory_end _MPFR_PROTO ((void));

void tests_start_mpfr _MPFR_PROTO ((void));
void tests_end_mpfr _MPFR_PROTO ((void));

int mpfr_set_machine_rnd_mode _MPFR_PROTO ((mp_rnd_t));
void mpfr_test_init _MPFR_PROTO ((void));
mp_limb_t randlimb _MPFR_PROTO ((void));
void randseed _MPFR_PROTO ((unsigned int));
int ulp _MPFR_PROTO ((double, double));
double dbl _MPFR_PROTO ((double, int));
double Ulp _MPFR_PROTO ((double));
int Isnan _MPFR_PROTO ((double));
void d_trace _MPFR_PROTO ((const char *, double));
void ld_trace _MPFR_PROTO ((const char *, long double));

FILE *src_fopen _MPFR_PROTO ((const char *, const char *));
void set_emin _MPFR_PROTO ((mp_exp_t));
void set_emax _MPFR_PROTO ((mp_exp_t));
void tests_default_random _MPFR_PROTO ((mpfr_ptr));

int mpfr_cmp_str _MPFR_PROTO ((mpfr_srcptr x, const char *, int, mp_rnd_t));
#define mpfr_cmp_str1(x,s) mpfr_cmp_str(x,s,10,GMP_RNDN)
#define mpfr_set_str1(x,s) mpfr_set_str(x,s,10,GMP_RNDN)

#define mpfr_cmp0(x,y) (MPFR_ASSERTN (!MPFR_IS_NAN (x) && !MPFR_IS_NAN (y)), mpfr_cmp (x,y))

#ifndef MPFR_TEST_USE_RANDS
# define MPFR_TEST_USE_RANDS() ((void)0)
#endif

#if defined (__cplusplus)
}
#endif

/* define CHECK_EXTERNAL if you want to check mpfr against another library
   with correct rounding. You'll probably have to modify mpfr_print_raw()
   and/or test_add() below:
   * mpfr_print_raw() prints each number as "p m e" where p is the precision,
     m the mantissa (as a binary integer with sign), and e the exponent.
     The corresponding number is m*2^e. Example: "2 10 -6" represents
     2*2^(-6) with a precision of 2 bits.
   * test_add() outputs "b c a" on one line, for each addition a <- b + c.
     Currently it only prints such a line for rounding to nearest, when
     the inputs b and c are not NaN and/or Inf.
*/
#ifdef CHECK_EXTERNAL
static void
mpfr_print_raw (mpfr_srcptr x)
{
  printf ("%lu ", MPFR_PREC (x));
  if (MPFR_IS_NAN (x))
    {
      printf ("@NaN@");
      return;
    }

  if (MPFR_SIGN (x) < 0)
    printf ("-");

  if (MPFR_IS_INF (x))
    printf ("@Inf@");
  else if (MPFR_IS_ZERO (x))
    printf ("0 0");
  else
    {
      mp_limb_t *mx;
      mp_prec_t px;
      mp_size_t n;

      mx = MPFR_MANT (x);
      px = MPFR_PREC (x);

      for (n = (px - 1) / BITS_PER_MP_LIMB; ; n--)
        {
          mp_limb_t wd, t;

          MPFR_ASSERTN (n >= 0);
          wd = mx[n];
          for (t = MPFR_LIMB_HIGHBIT; t != 0; t >>= 1)
            {
              printf ((wd & t) == 0 ? "0" : "1");
              if (--px == 0)
                {
                  mp_exp_t ex;

                  ex = MPFR_GET_EXP (x);
                  MPFR_ASSERTN (ex >= LONG_MIN && ex <= LONG_MAX);
                  printf (" %ld", (long) ex - (long) MPFR_PREC (x));
                  return;
                }
            }
        }
    }
}
#endif

#endif