/* Test file for mpfr_{mul,div}_2{ui,si}.

Copyright 1999, 2001, 2002, 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.

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. */

#include <stdio.h>
#include <stdlib.h>

#include "mpfr-test.h"

static const char * const val[] = {
  "1.0001@100","4.0004000000000@102", "4.0004000000000@97",
  "1.ABF012345@-100","6.afc048d140000@-98","6.afc048d140000@-103",
  "F.FFFFFFFFF@10000","3.fffffffffc000@10003","3.fffffffffc000@9998",
  "1.23456789ABCDEF@42","4.8d159e26af37c@44","4.8d159e26af37c@39",
  "17@42","5.c000000000000@45","5.c000000000000@40",
  "42@-17","1.0800000000000@-13","1.0800000000000@-18"
};

static int
test_mul (int i, int div, mpfr_ptr y, mpfr_srcptr x,
          unsigned long int n, mp_rnd_t r)
{
  return
    i == 0 ? (div ? mpfr_div_2ui : mpfr_mul_2ui) (y, x, n, r) :
    i == 1 ? (div ? mpfr_div_2si : mpfr_mul_2si) (y, x, n, r) :
    i == 2 ? (div ? mpfr_mul_2si : mpfr_div_2si) (y, x, -n, r) :
    (exit (1), 0);
}

int
main (int argc, char *argv[])
{
  mpfr_t w,z;
  unsigned long k;
  int i;

  tests_start_mpfr ();

  mpfr_inits2 (53, w, z, (void *) 0);

  for (i = 0; i < 3; i++)
    {
      mpfr_set_inf (w, 1);
      test_mul (i, 0, w, w, 10, GMP_RNDZ);
      if (!MPFR_IS_INF(w))
        {
          printf ("Result is not Inf (i = %d)\n", i);
          exit (1);
        }

      mpfr_set_nan (w);
      test_mul (i, 0, w, w, 10, GMP_RNDZ);
      if (!MPFR_IS_NAN(w))
        {
          printf ("Result is not NaN (i = %d)\n", i);
          exit (1);
        }

      for (k = 0 ; k < numberof(val) ; k+=3)
        {
          mpfr_set_str (w, val[k], 16, GMP_RNDN);
          test_mul (i, 0, z, w, 10, GMP_RNDZ);
          if (mpfr_cmp_str (z, val[k+1], 16, GMP_RNDN))
            {
              printf ("ERROR for x * 2^n (i = %d) for %s\n", i, val[k]);
              printf ("Expected: %s\n"
                      "Got     : ", val[k+1]);
              mpfr_out_str (stdout, 16, 0, z, GMP_RNDN);
              putchar ('\n');
              exit (1);
            }
          test_mul (i, 1, z, w, 10, GMP_RNDZ);
          if (mpfr_cmp_str (z, val[k+2], 16, GMP_RNDN))
            {
              printf ("ERROR for x / 2^n (i = %d) for %s\n", i, val[k]);
              printf ("Expected: %s\n"
                      "Got     : ", val[k+2]);
              mpfr_out_str (stdout, 16, 0, z, GMP_RNDN);
              putchar ('\n');
              exit (1);
            }
        }

      mpfr_set_inf (w, 1);
      mpfr_nextbelow (w);
      test_mul (i, 0, w, w, 1, GMP_RNDN);
      if (!mpfr_inf_p (w))
        {
          printf ("Overflow error (i = %d)!\n", i);
          exit (1);
        }
      mpfr_set_ui (w, 0, GMP_RNDN);
      mpfr_nextabove (w);
      test_mul (i, 1, w, w, 1, GMP_RNDN);
      if (mpfr_cmp_ui (w, 0))
        {
          printf ("Underflow error (i = %d)!\n", i);
          exit (1);
        }
    }

  if (MPFR_EXP_MAX >= LONG_MAX/2 && MPFR_EXP_MIN <= LONG_MAX/2-LONG_MAX-1)
    {
      unsigned long lmp1 = (unsigned long) LONG_MAX + 1;

      mpfr_set_ui (w, 1, GMP_RNDN);
      mpfr_mul_2ui (w, w, LONG_MAX/2, GMP_RNDZ);
      mpfr_div_2ui (w, w, lmp1, GMP_RNDZ);
      mpfr_mul_2ui (w, w, lmp1 - LONG_MAX/2, GMP_RNDZ);
      if (!mpfr_cmp_ui (w, 1))
        {
          printf ("Underflow LONG_MAX error!\n");
          exit (1);
        }
    }

  mpfr_clears (w, z, (void *) 0);

  tests_end_mpfr ();
  return 0;
}
