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/* Test file for mpz_set_fr / mpfr_get_z.
Copyright 2004, 2006-2020 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-test.h"
static void
check_diff (void)
{
int inex;
mpfr_t x;
mpz_t z;
mpfr_exp_t emin;
mpz_init (z);
mpfr_init2 (x, 2);
mpfr_set_ui (x, 2047, MPFR_RNDU);
mpz_set_fr (z, x, MPFR_RNDN);
if (mpz_cmp_ui (z, 2048) != 0)
{
printf ("get_z RU 2048 failed\n");
exit (1);
}
mpfr_set_prec (x, 6);
mpfr_set_str (x, "17.5", 10, MPFR_RNDN);
inex = mpfr_get_z (z, x, MPFR_RNDN);
if (inex <= 0 || mpz_cmp_ui (z, 18) != 0)
{
printf ("get_z RN 17.5 failed\n");
exit (1);
}
/* save default emin */
emin = mpfr_get_emin ();;
mpfr_set_emin (17);
mpfr_set_ui (x, 0, MPFR_RNDN);
inex = mpfr_get_z (z, x, MPFR_RNDN);
if (inex != 0 || mpz_cmp_ui (z, 0) != 0)
{
printf ("get_z 0 failed\n");
exit (1);
}
/* restore default emin */
mpfr_set_emin (emin);
mpfr_clear (x);
mpz_clear (z);
}
static void
check_one (mpz_ptr z)
{
mpfr_exp_t emin, emax;
int inex;
int sh, neg;
mpfr_t f;
mpz_t got, ex, t;
emin = mpfr_get_emin ();
emax = mpfr_get_emax ();
mpfr_init2 (f, MAX (mpz_sizeinbase (z, 2), MPFR_PREC_MIN));
mpz_init (got);
mpz_init (ex);
mpz_init (t);
for (sh = -2*GMP_NUMB_BITS ; sh < 2*GMP_NUMB_BITS ; sh++)
{
inex = mpfr_set_z (f, z, MPFR_RNDN); /* exact */
MPFR_ASSERTN (inex == 0);
inex = sh < 0 ?
mpfr_div_2ui (f, f, -sh, MPFR_RNDN) :
mpfr_mul_2ui (f, f, sh, MPFR_RNDN);
MPFR_ASSERTN (inex == 0);
for (neg = 0; neg <= 1; neg++)
{
int rnd;
/* Test (-1)^neg * z * 2^sh */
RND_LOOP_NO_RNDF (rnd)
{
int ex_inex, same;
int d, fi, e;
mpfr_flags_t flags[3] = { 0, MPFR_FLAGS_ALL ^ MPFR_FLAGS_ERANGE,
MPFR_FLAGS_ALL }, ex_flags, gt_flags;
if (neg)
mpz_neg (ex, z);
else
mpz_set (ex, z);
if (sh < 0)
switch (rnd)
{
case MPFR_RNDN:
mpz_set_si (t, neg ? -1 : 1);
mpz_mul_2exp (t, t, -sh - 1);
mpz_add (ex, ex, t);
/* d = mpz_divisible_2exp_p (ex, -sh); */
d = mpz_scan1 (ex, 0) >= -sh;
mpz_tdiv_q_2exp (ex, ex, -sh);
if (d && mpz_tstbit (ex, 0) != 0) /* even rounding */
{
if (neg)
mpz_add_ui (ex, ex, 1);
else
mpz_sub_ui (ex, ex, 1);
}
break;
case MPFR_RNDZ:
mpz_tdiv_q_2exp (ex, ex, -sh);
break;
case MPFR_RNDU:
mpz_cdiv_q_2exp (ex, ex, -sh);
break;
case MPFR_RNDD:
mpz_fdiv_q_2exp (ex, ex, -sh);
break;
case MPFR_RNDA:
if (neg)
mpz_fdiv_q_2exp (ex, ex, -sh);
else
mpz_cdiv_q_2exp (ex, ex, -sh);
break;
default:
MPFR_ASSERTN (0);
}
else
mpz_mul_2exp (ex, ex, sh);
ex_inex = - mpfr_cmp_z (f, ex);
ex_inex = VSIGN (ex_inex);
for (fi = 0; fi < numberof (flags); fi++)
for (e = 0; e < 2; e++)
{
if (e)
{
mpfr_exp_t ef;
if (MPFR_IS_ZERO (f))
break;
ef = MPFR_GET_EXP (f);
set_emin (ef);
set_emax (ef);
}
ex_flags = __gmpfr_flags = flags[fi];
if (ex_inex != 0)
ex_flags |= MPFR_FLAGS_INEXACT;
inex = mpfr_get_z (got, f, (mpfr_rnd_t) rnd);
inex = VSIGN (inex);
gt_flags = __gmpfr_flags;
set_emin (emin);
set_emax (emax);
same = SAME_SIGN (inex, ex_inex);
if (mpz_cmp (got, ex) != 0 ||
!same || gt_flags != ex_flags)
{
printf ("Error in check_one for sh=%d, fi=%d, %s%s\n",
sh, fi,
mpfr_print_rnd_mode ((mpfr_rnd_t) rnd),
e ? ", reduced exponent range" : "");
printf (" f = "); mpfr_dump (f);
printf ("expected "); mpz_out_str (stdout, 10, ex);
printf ("\n got "); mpz_out_str (stdout, 10, got);
printf ("\nExpected inex ~ %d, got %d (%s)\n",
ex_inex, inex, same ? "OK" : "wrong");
printf ("Flags:\n");
printf (" in"); flags_out (flags[fi]);
printf ("expected"); flags_out (ex_flags);
printf (" got"); flags_out (gt_flags);
exit (1);
}
}
}
mpfr_neg (f, f, MPFR_RNDN);
}
}
mpfr_clear (f);
mpz_clear (got);
mpz_clear (ex);
mpz_clear (t);
}
static void
check (void)
{
mpz_t z;
mpz_init (z);
mpz_set_ui (z, 0L);
check_one (z);
mpz_set_si (z, 17L);
check_one (z);
mpz_set_si (z, 123L);
check_one (z);
mpz_rrandomb (z, RANDS, 2*GMP_NUMB_BITS);
check_one (z);
mpz_rrandomb (z, RANDS, 5*GMP_NUMB_BITS);
check_one (z);
mpz_clear (z);
}
static void
special (void)
{
int inex;
mpfr_t x;
mpz_t z;
int i, fi;
int rnd;
mpfr_exp_t e;
mpfr_flags_t flags[3] = { 0, MPFR_FLAGS_ALL ^ MPFR_FLAGS_ERANGE,
MPFR_FLAGS_ALL }, ex_flags, gt_flags;
mpfr_init2 (x, 2);
mpz_init (z);
RND_LOOP (rnd)
for (i = -1; i <= 1; i++)
for (fi = 0; fi < numberof (flags); fi++)
{
ex_flags = flags[fi] | MPFR_FLAGS_ERANGE;
if (i != 0)
mpfr_set_nan (x);
else
mpfr_set_inf (x, i);
__gmpfr_flags = flags[fi];
inex = mpfr_get_z (z, x, (mpfr_rnd_t) rnd);
gt_flags = __gmpfr_flags;
if (gt_flags != ex_flags || inex != 0 || mpz_cmp_ui (z, 0) != 0)
{
printf ("special() failed on mpfr_get_z"
" for %s, i = %d, fi = %d\n",
mpfr_print_rnd_mode ((mpfr_rnd_t) rnd), i, fi);
printf ("Expected z = 0, inex = 0,");
flags_out (ex_flags);
printf ("Got z = ");
mpz_out_str (stdout, 10, z);
printf (", inex = %d,", inex);
flags_out (gt_flags);
exit (1);
}
__gmpfr_flags = flags[fi];
e = mpfr_get_z_2exp (z, x);
gt_flags = __gmpfr_flags;
if (gt_flags != ex_flags || e != __gmpfr_emin ||
mpz_cmp_ui (z, 0) != 0)
{
printf ("special() failed on mpfr_get_z_2exp"
" for %s, i = %d, fi = %d\n",
mpfr_print_rnd_mode ((mpfr_rnd_t) rnd), i, fi);
printf ("Expected z = 0, e = %" MPFR_EXP_FSPEC "d,",
(mpfr_eexp_t) __gmpfr_emin);
flags_out (ex_flags);
printf ("Got z = ");
mpz_out_str (stdout, 10, z);
printf (", e = %" MPFR_EXP_FSPEC "d,", (mpfr_eexp_t) e);
flags_out (gt_flags);
exit (1);
}
}
mpfr_clear (x);
mpz_clear (z);
}
int
main (void)
{
tests_start_mpfr ();
check ();
check_diff ();
special ();
tests_end_mpfr ();
return 0;
}
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