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/* Test file for mpfr_abs.
Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-test.h"
#define Infp (1/0.)
void check_inexact _PROTO((void));
void
check_inexact ()
{
mp_prec_t p, q;
mpfr_t x, y, absx;
mp_rnd_t rnd;
int inexact, cmp;
mpfr_init (x);
mpfr_init (y);
mpfr_init (absx);
for (p=1; p<500; p++)
{
mpfr_set_prec (x, p);
mpfr_set_prec (absx, p);
mpfr_random (x);
if (rand () % 2)
{
mpfr_set (absx, x, GMP_RNDN);
mpfr_neg (x, x, GMP_RNDN);
}
else
mpfr_set (absx, x, GMP_RNDN);
for (q=1; q<2*p; q++)
{
mpfr_set_prec (y, q);
for (rnd=0; rnd<4; rnd++)
{
inexact = mpfr_abs (y, x, rnd);
cmp = mpfr_cmp (y, absx);
if (((inexact == 0) && (cmp != 0)) ||
((inexact > 0) && (cmp <= 0)) ||
((inexact < 0) && (cmp >= 0)))
{
fprintf (stderr, "Wrong inexact flag: expected %d, got %d\n", cmp, inexact);
printf ("x="); mpfr_print_binary (x); putchar ('\n');
printf ("absx="); mpfr_print_binary (absx); putchar ('\n');
printf ("y="); mpfr_print_binary (y); putchar ('\n');
exit (1);
}
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (absx);
}
int
main (int argc, char *argv[])
{
mpfr_t x; int n, k, rnd; double d, dd;
#ifdef __mips
/* to get denormalized numbers on IRIX64 */
union fpc_csr exp;
exp.fc_word = get_fpc_csr();
exp.fc_struct.flush = 0;
set_fpc_csr(exp.fc_word);
#endif
check_inexact ();
mpfr_init2(x, 53);
mpfr_set_d(x, 1.0, GMP_RNDN);
mpfr_abs(x, x, GMP_RNDN);
if (mpfr_get_d(x) != 1.0) {
fprintf(stderr, "Error in mpfr_abs(1.0)\n"); exit(1);
}
mpfr_set_d(x, -1.0, GMP_RNDN);
mpfr_abs(x, x, GMP_RNDN);
if (mpfr_get_d(x) != 1.0) {
fprintf(stderr, "Error in mpfr_abs(-1.0)\n"); exit(1);
}
mpfr_set_d(x, -6/-0., GMP_RNDN);
mpfr_abs(x, x, GMP_RNDN);
if (mpfr_get_d(x) != Infp) {
fprintf(stderr, "Error in mpfr_abs(Inf).\n"); exit(1);
}
mpfr_set_d(x, 2/-0., GMP_RNDN);
mpfr_abs(x, x, GMP_RNDN);
if (mpfr_get_d(x) != Infp) {
fprintf(stderr, "Error in mpfr_abs(-Inf).\n"); exit(1);
}
n = (argc==1) ? 1000000 : atoi(argv[1]);
for (k = 1; k <= n; k++)
{
d = drand();
rnd = rand() % 4;
mpfr_set_d(x, d, 0);
mpfr_abs(x, x, rnd);
dd = mpfr_get_d(x);
if (dd != fabs(d) && !isnan(d))
{
fprintf(stderr,
"Mismatch on d = %1.18g\n", d);
mpfr_print_binary(x); putchar('\n');
exit(1);
}
}
mpfr_clear(x);
return 0;
}
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