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/* Test file for mpfr_reldiff.
Copyright 2000-2025 Free Software Foundation, Inc.
Contributed by the Pascaline 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/>. */
#include "mpfr-test.h"
#define SPECIAL_MAX 12
/* copied from reuse.c */
static void
set_special (mpfr_ptr x, unsigned int select)
{
MPFR_ASSERTN (select < SPECIAL_MAX);
switch (select)
{
case 0:
MPFR_SET_NAN (x);
break;
case 1:
MPFR_SET_INF (x);
MPFR_SET_POS (x);
break;
case 2:
MPFR_SET_INF (x);
MPFR_SET_NEG (x);
break;
case 3:
MPFR_SET_ZERO (x);
MPFR_SET_POS (x);
break;
case 4:
MPFR_SET_ZERO (x);
MPFR_SET_NEG (x);
break;
case 5:
mpfr_set_str_binary (x, "1");
break;
case 6:
mpfr_set_str_binary (x, "-1");
break;
case 7:
mpfr_set_str_binary (x, "1e-1");
break;
case 8:
mpfr_set_str_binary (x, "1e+1");
break;
case 9:
mpfr_const_pi (x, MPFR_RNDN);
break;
case 10:
mpfr_const_pi (x, MPFR_RNDN);
MPFR_SET_EXP (x, MPFR_GET_EXP (x)-1);
break;
case 11:
mpfr_urandomb (x, RANDS);
if (RAND_BOOL ())
mpfr_neg (x, x, MPFR_RNDN);
break;
default:
MPFR_ASSERTN (0);
}
}
int
main (void)
{
mpfr_t a1, a2, b, c;
int pa, pb, pc, i, j, r;
int prec[] = { MPFR_PREC_MIN, 3, 16, 32, 53 };
tests_start_mpfr ();
/* Just check that mpfr_reldiff(a,b,c,rnd) computes |b-c|/b using the
precision of a, without any optimization. */
for (pa = 0; pa < numberof(prec); pa++)
{
mpfr_inits2 (prec[pa], a1, a2, (mpfr_ptr) 0);
for (pb = 0; pb < numberof(prec); pb++)
{
mpfr_init2 (b, prec[pb]);
for (pc = 0; pc < numberof(prec); pc++)
{
mpfr_init2 (c, prec[pc]);
for (i = 0; i < SPECIAL_MAX; i++)
{
set_special (b, i);
for (j = 0; j < SPECIAL_MAX; j++)
{
set_special (c, j);
RND_LOOP (r)
{
mpfr_rnd_t rnd = (mpfr_rnd_t) r;
mpfr_sub (a1, b, c, rnd);
mpfr_abs (a1, a1, rnd);
mpfr_div (a1, a1, b, rnd);
mpfr_reldiff (a2, b, c, rnd);
if (! SAME_VAL (a1, a2))
{
printf ("Error for pa=%d pb=%d pc=%d "
"i=%d j=%d rnd=%s\n", pa, pb, pc,
i, j, mpfr_print_rnd_mode (rnd));
printf ("expected ");
mpfr_dump (a1);
printf ("got ");
mpfr_dump (a2);
exit (1);
}
}
}
}
mpfr_clear (c);
}
mpfr_clear (b);
}
mpfr_clears (a1, a2, (mpfr_ptr) 0);
}
tests_end_mpfr ();
return 0;
}
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