gcc/mpfr/tests/tset_si.c

/* Test file for mpfr_set_si and mpfr_set_ui.

Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao 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 2.1 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.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 <limits.h>

#include "mpfr-test.h"

#define ERROR(str) {printf("Error for "str"\n"); exit(1);}

static void
test_2exp (void)
{
  mpfr_t x;
  int res;

  mpfr_init2 (x, 32);

  mpfr_set_ui_2exp (x, 1, 0, GMP_RNDN);
  if (mpfr_cmp_ui(x, 1))
    ERROR("(1U,0)");

  mpfr_set_ui_2exp (x, 1024, -10, GMP_RNDN);
  if (mpfr_cmp_ui(x, 1))
    ERROR("(1024U,-10)");

  mpfr_set_ui_2exp (x, 1024, 10, GMP_RNDN);
  if (mpfr_cmp_ui(x, 1024*1024))
    ERROR("(1024U,+10)");

  mpfr_set_si_2exp (x, -1024L * 1024L, -10, GMP_RNDN);
  if (mpfr_cmp_si(x, -1024))
    ERROR("(1M,-10)");

  mpfr_set_ui_2exp (x, 0x92345678, 16, GMP_RNDN);
  if (mpfr_cmp_str (x, "92345678@4", 16, GMP_RNDN))
    ERROR("(x92345678U,+16)");

  mpfr_set_si_2exp (x, -0x1ABCDEF0, -256, GMP_RNDN);
  if (mpfr_cmp_str (x, "-1ABCDEF0@-64", 16, GMP_RNDN))
    ERROR("(-x1ABCDEF0,-256)");

  mpfr_set_prec (x, 2);
  res = mpfr_set_si_2exp (x, 7, 10, GMP_RNDU);
  if (mpfr_cmp_ui (x, 1<<13) || res <= 0)
    ERROR ("Prec 2 + si_2exp");

  res = mpfr_set_ui_2exp (x, 7, 10, GMP_RNDU);
  if (mpfr_cmp_ui (x, 1<<13) || res <= 0)
    ERROR ("Prec 2 + ui_2exp");

  mpfr_clear_flags ();
  mpfr_set_ui_2exp (x, 17, MPFR_EMAX_MAX, GMP_RNDN);
  if (!mpfr_inf_p (x) || MPFR_IS_NEG (x))
    ERROR ("mpfr_set_ui_2exp and overflow (bad result)");
  if (!mpfr_overflow_p ())
    ERROR ("mpfr_set_ui_2exp and overflow (overflow flag not set)");

  mpfr_clear_flags ();
  mpfr_set_si_2exp (x, 17, MPFR_EMAX_MAX, GMP_RNDN);
  if (!mpfr_inf_p (x) || MPFR_IS_NEG (x))
    ERROR ("mpfr_set_si_2exp (pos) and overflow (bad result)");
  if (!mpfr_overflow_p ())
    ERROR ("mpfr_set_si_2exp (pos) and overflow (overflow flag not set)");

  mpfr_clear_flags ();
  mpfr_set_si_2exp (x, -17, MPFR_EMAX_MAX, GMP_RNDN);
  if (!mpfr_inf_p (x) || MPFR_IS_POS (x))
    ERROR ("mpfr_set_si_2exp (neg) and overflow (bad result)");
  if (!mpfr_overflow_p ())
    ERROR ("mpfr_set_si_2exp (neg) and overflow (overflow flag not set)");

  mpfr_clear (x);
}

static void
test_macros (void)
{
  mpfr_t x[3];
  mpfr_ptr p;
  int r;

  mpfr_inits (x[0], x[1], x[2], (mpfr_ptr) 0);
  p = x[0];
  r = 0;
  mpfr_set_ui (p++, 0, (mp_rnd_t) r++);
  if (p != x[1] || r != 1)
    {
      printf ("Error in mpfr_set_ui macro: p - x[0] = %d (expecting 1), "
              "r = %d (expecting 1)\n", (int) (p - x[0]), r);
      exit (1);
    }
  p = x[0];
  r = 0;
  mpfr_set_si (p++, 0, (mp_rnd_t) r++);
  if (p != x[1] || r != 1)
    {
      printf ("Error in mpfr_set_si macro: p - x[0] = %d (expecting 1), "
              "r = %d (expecting 1)\n", (int) (p - x[0]), r);
      exit (1);
    }
  mpfr_clears (x[0], x[1], x[2], (mpfr_ptr) 0);
}

/* FIXME: Comparing against mpfr_get_si/ui is not ideal, it'd be better to
   have all tests examine the bits in mpfr_t for what should come out.  */

int
main (int argc, char *argv[])
{
  mpfr_t x;
  long k, z, d, N;
  unsigned long zl, dl;
  int inex;
  int r;
  mp_exp_t emin, emax;
  int flag;

  tests_start_mpfr ();

  mpfr_init2 (x, 100);

  N = (argc==1) ? 100000 : atol (argv[1]);

  for (k = 1; k <= N; k++)
    {
      z = (long) (randlimb () & LONG_MAX) + LONG_MIN / 2;
      inex = mpfr_set_si (x, z, GMP_RNDZ);
      d = mpfr_get_si (x, GMP_RNDZ);
      if (d != z)
        {
          printf ("Error in mpfr_set_si: expected %ld got %ld\n", z, d);
          exit (1);
        }
      if (inex)
        {
          printf ("Error in mpfr_set_si: inex value incorrect for %ld: %d\n",
                  z, inex);
          exit (1);
        }
    }

  for (k = 1; k <= N; k++)
    {
      zl = randlimb ();
      inex = mpfr_set_ui (x, zl, GMP_RNDZ);
      dl = mpfr_get_ui (x, GMP_RNDZ);
      if (dl != zl)
        {
          printf ("Error in mpfr_set_ui: expected %lu got %lu\n", zl, dl);
          exit (1);
        }
      if (inex)
        {
          printf ("Error in mpfr_set_ui: inex value incorrect for %lu: %d\n",
                  zl, inex);
          exit (1);
        }
    }

  mpfr_set_prec (x, 2);
  if (mpfr_set_si (x, 5, GMP_RNDZ) >= 0)
    {
      printf ("Wrong inexact flag for x=5, rnd=GMP_RNDZ\n");
      exit (1);
    }

  mpfr_set_prec (x, 2);
  if (mpfr_set_si (x, -5, GMP_RNDZ) <= 0)
    {
      printf ("Wrong inexact flag for x=-5, rnd=GMP_RNDZ\n");
      exit (1);
    }

  mpfr_set_prec (x, 3);
  inex = mpfr_set_si (x, 77617, GMP_RNDD); /* should be 65536 */
  if (MPFR_MANT(x)[0] != ((mp_limb_t)1 << (mp_bits_per_limb-1))
      || inex >= 0)
    {
      printf ("Error in mpfr_set_si(x:3, 77617, GMP_RNDD)\n");
      mpfr_print_binary (x);
      puts ("");
      exit (1);
    }
  inex = mpfr_set_ui (x, 77617, GMP_RNDD); /* should be 65536 */
  if (MPFR_MANT(x)[0] != ((mp_limb_t)1 << (mp_bits_per_limb-1))
      || inex >= 0)
    {
      printf ("Error in mpfr_set_ui(x:3, 77617, GMP_RNDD)\n");
      mpfr_print_binary (x);
      puts ("");
      exit (1);
    }

  mpfr_set_prec (x, 2);
  inex = mpfr_set_si (x, 33096, GMP_RNDU);
  if (mpfr_get_si (x, GMP_RNDZ) != 49152 || inex <= 0)
    {
      printf ("Error in mpfr_set_si, exp. 49152, got %ld, inex %d\n",
              mpfr_get_si (x, GMP_RNDZ), inex);
      exit (1);
    }
  inex = mpfr_set_ui (x, 33096, GMP_RNDU);
  if (mpfr_get_si (x, GMP_RNDZ) != 49152)
    {
      printf ("Error in mpfr_set_ui, exp. 49152, got %ld, inex %d\n",
              mpfr_get_si (x, GMP_RNDZ), inex);
      exit (1);
    }

  for (r = 0 ; r < GMP_RND_MAX ; r++)
    {
      mpfr_set_si (x, -1, (mp_rnd_t) r);
      mpfr_set_ui (x, 0, (mp_rnd_t) r);
      if (MPFR_IS_NEG (x) || mpfr_get_ui (x, (mp_rnd_t) r) != 0)
        {
          printf ("mpfr_set_ui (x, 0) gives -0 for %s\n",
                  mpfr_print_rnd_mode ((mp_rnd_t) r));
          exit (1);
        }

      mpfr_set_si (x, -1, (mp_rnd_t) r);
      mpfr_set_si (x, 0, (mp_rnd_t) r);
      if (MPFR_IS_NEG (x) || mpfr_get_si (x, (mp_rnd_t) r) != 0)
        {
          printf ("mpfr_set_si (x, 0) gives -0 for %s\n",
                  mpfr_print_rnd_mode ((mp_rnd_t) r));
          exit (1);
        }
    }

  /* check potential bug in case mp_limb_t is unsigned */
  emax = mpfr_get_emax ();
  set_emax (0);
  mpfr_set_si (x, -1, GMP_RNDN);
  if (mpfr_sgn (x) >= 0)
    {
      printf ("mpfr_set_si (x, -1) fails\n");
      exit (1);
    }
  set_emax (emax);

  emax = mpfr_get_emax ();
  set_emax (5);
  mpfr_set_prec (x, 2);
  mpfr_set_si (x, -31, GMP_RNDN);
  if (mpfr_sgn (x) >= 0)
    {
      printf ("mpfr_set_si (x, -31) fails\n");
      exit (1);
    }
  set_emax (emax);

  /* test for get_ui */
  mpfr_set_ui (x, 0, GMP_RNDN);
  MPFR_ASSERTN(mpfr_get_ui (x, GMP_RNDN) == 0);
  mpfr_set_ui (x, ULONG_MAX, GMP_RNDU);
  mpfr_nextabove (x);
  mpfr_get_ui (x, GMP_RNDU);

  /* another test for get_ui */
  mpfr_set_prec (x, 10);
  mpfr_set_str_binary (x, "10.101");
  dl = mpfr_get_ui (x, GMP_RNDN);
  MPFR_ASSERTN (dl == 3);

  mpfr_set_str_binary (x, "-1.0");
  mpfr_get_ui (x, GMP_RNDN);

  mpfr_set_str_binary (x, "0.1");
  dl = mpfr_get_ui (x, GMP_RNDN);
  MPFR_ASSERTN (dl == 0);
  dl = mpfr_get_ui (x, GMP_RNDZ);
  MPFR_ASSERTN (dl == 0);
  dl = mpfr_get_ui (x, GMP_RNDD);
  MPFR_ASSERTN (dl == 0);
  dl = mpfr_get_ui (x, GMP_RNDU);
  MPFR_ASSERTN (dl == 1);

  /* coverage tests */
  mpfr_set_prec (x, 2);
  mpfr_set_si (x, -7, GMP_RNDD);
  MPFR_ASSERTN(mpfr_cmp_si (x, -8) == 0);
  mpfr_set_prec (x, 2);
  mpfr_set_ui (x, 7, GMP_RNDU);
  MPFR_ASSERTN(mpfr_cmp_ui (x, 8) == 0);
  emax = mpfr_get_emax ();
  set_emax (3);
  mpfr_set_ui (x, 7, GMP_RNDU);
  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
  set_emax (1);
  MPFR_ASSERTN( mpfr_set_ui (x, 7, GMP_RNDU) );
  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
  set_emax (emax);
  mpfr_set_ui_2exp (x, 17, -50, GMP_RNDN);
  MPFR_ASSERTN (mpfr_get_ui (x, GMP_RNDD) == 0);
  MPFR_ASSERTN (mpfr_get_si (x, GMP_RNDD) == 0);

  /* Test for ERANGE flag + correct behaviour if overflow */
  mpfr_set_prec (x, 256);
  mpfr_set_ui (x, ULONG_MAX, GMP_RNDN);
  mpfr_clear_erangeflag ();
  dl = mpfr_get_ui (x, GMP_RNDN);
  if (dl != ULONG_MAX || mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_ui + ERANGE + ULONG_MAX (1)\n");
      exit (1);
    }
  mpfr_add_ui (x, x, 1, GMP_RNDN);
  dl = mpfr_get_ui (x, GMP_RNDN);
  if (dl != ULONG_MAX || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_ui + ERANGE + ULONG_MAX (2)\n");
      exit (1);
    }
  mpfr_set_si (x, -1, GMP_RNDN);
  mpfr_clear_erangeflag ();
  dl = mpfr_get_ui (x, GMP_RNDN);
  if (dl != 0 || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_ui + ERANGE + -1 \n");
      exit (1);
    }
  mpfr_set_si (x, LONG_MAX, GMP_RNDN);
  mpfr_clear_erangeflag ();
  d = mpfr_get_si (x, GMP_RNDN);
  if (d != LONG_MAX || mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_si + ERANGE + LONG_MAX (1): %ld\n", d);
      exit (1);
    }
  mpfr_add_ui (x, x, 1, GMP_RNDN);
  d = mpfr_get_si (x, GMP_RNDN);
  if (d != LONG_MAX || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_si + ERANGE + LONG_MAX (2)\n");
      exit (1);
    }
  mpfr_set_si (x, LONG_MIN, GMP_RNDN);
  mpfr_clear_erangeflag ();
  d = mpfr_get_si (x, GMP_RNDN);
  if (d != LONG_MIN || mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_si + ERANGE + LONG_MIN (1)\n");
      exit (1);
    }
  mpfr_sub_ui (x, x, 1, GMP_RNDN);
  d = mpfr_get_si (x, GMP_RNDN);
  if (d != LONG_MIN || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_si + ERANGE + LONG_MIN (2)\n");
      exit (1);
    }

  emin = mpfr_get_emin ();
  mpfr_set_prec (x, 2);

  mpfr_set_emin (4);
  mpfr_clear_flags ();
  mpfr_set_ui (x, 7, GMP_RNDU);
  flag = mpfr_underflow_p ();
  mpfr_set_emin (emin);
  if (mpfr_cmp_ui (x, 8) != 0)
    {
      printf ("Error for mpfr_set_ui (x, 7, GMP_RNDU), prec = 2, emin = 4\n");
      exit (1);
    }
  if (flag)
    {
      printf ("mpfr_set_ui (x, 7, GMP_RNDU) should not underflow "
              "with prec = 2, emin = 4\n");
      exit (1);
    }

  mpfr_set_emin (4);
  mpfr_clear_flags ();
  mpfr_set_si (x, -7, GMP_RNDD);
  flag = mpfr_underflow_p ();
  mpfr_set_emin (emin);
  if (mpfr_cmp_si (x, -8) != 0)
    {
      printf ("Error for mpfr_set_si (x, -7, GMP_RNDD), prec = 2, emin = 4\n");
      exit (1);
    }
  if (flag)
    {
      printf ("mpfr_set_si (x, -7, GMP_RNDD) should not underflow "
              "with prec = 2, emin = 4\n");
      exit (1);
    }

  mpfr_clear (x);

  test_2exp ();
  test_macros ();
  tests_end_mpfr ();
  return 0;
}