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/* template for complex -> real function, for example abs
Copyright (C) 2020 INRIA
This file is part of GNU MPC.
GNU MPC 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.
GNU MPC 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 this program. If not, see http://www.gnu.org/licenses/ .
*/
#define CAT1(X,Y) X ## Y
#define CAT2(X,Y) CAT1(X,Y)
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define FUN CAT2(test_,FOO)
#define CHECK CAT2(check_,FOO)
#define MPC_FOO CAT2(mpc_,FOO)
#define CFOO CAT2(CAT2(c,FOO),SUFFIX)
#define BAR TOSTRING(FOO)
#define EXTRA 20
/* routine to double-check result from MPC with more precision and without
reduced exponent range */
static void
CHECK (mpc_t x, mpfr_t z)
{
mpfr_exp_t saved_emin = mpfr_get_emin ();
mpfr_exp_t saved_emax = mpfr_get_emax ();
mpfr_prec_t p = mpfr_get_prec (mpc_realref (x)), pp = p + EXTRA;
mpfr_t t;
int inex, ok;
/* enlarge exponent range to the largest possible */
mpfr_set_emin (mpfr_get_emin_min ());
mpfr_set_emax (mpfr_get_emax_max ());
mpfr_init2 (t, pp);
MPC_FOO (t, x, MPFR_RNDN);
inex = mpfr_prec_round (t, p, MPFR_RNDN);
/* restore exponent range */
mpfr_set_emin (saved_emin);
mpfr_set_emax (saved_emax);
inex = mpfr_check_range (t, inex, MPFR_RNDN);
inex = mpfr_subnormalize (t, inex, MPFR_RNDN);
/* check real parts agree */
ok = mpfr_agree (z, t, inex);
if (!ok)
{
mpfr_printf ("Potential bug in mpc_%s for x=(%Re,%Re)\n", BAR,
mpc_realref (x), mpc_imagref (x));
mpfr_printf (" mpc_%s to precision %lu gives %Re\n", BAR, p, z);
mpfr_printf (" mpc_%s to precision %lu gives %Re\n", BAR, pp, t);
exit (1);
}
mpfr_clear (t);
}
static void
FUN (mpfr_prec_t p, unsigned long n)
{
unsigned long i = 0;
mpc_t x;
mpfr_t z, t;
TYPE complex xx;
TYPE zz;
int inex;
unsigned long errors = 0, max_err = 0;
if (verbose > 0)
printf ("Testing function %s\n", BAR);
gmp_randseed_ui (state, seed);
mpc_init2 (x, p);
mpfr_init2 (z, p);
mpfr_init2 (t, p);
for (i = 0; i < n; i++)
{
mpcheck_random (x);
inex = MPC_FOO (z, x, MPC_RNDNN);
mpfr_subnormalize (z, inex, MPFR_RNDN);
xx = mpc_get_type (x, MPC_RNDNN);
zz = CFOO (xx);
mpfr_set_type (t, zz, MPFR_RNDN);
if (mpcheck_mpfr_cmp (t, z) != 0)
{
unsigned long err = ulp_error (t, z);
if (verbose > 0 && err > max_err)
{
mpfr_printf (" mpc_%s and c%s differ by %lu ulp(s)\n for x=(%Re,%Re)\n",
BAR, BAR, err,
mpc_realref (x), mpc_imagref (x));
mpfr_printf (" mpc_%s gives %Re\n", BAR, z);
mpfr_printf (" c%s gives %Re\n", BAR, t);
}
if (recheck)
CHECK (x, z);
errors++;
if (err > max_err)
{
max_err = err;
if (max_err > Max_err)
Max_err = max_err;
}
}
}
mpc_clear (x);
mpfr_clear (z);
mpfr_clear (t);
printf ("Errors for %s: %lu/%lu (max %lu) [seed %lu]\n",
BAR, errors, n, max_err, seed);
}
#undef FOO
#undef CFOO
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