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Annotation of OpenXM_contrib/gmp/mpfr/tests/thypot.c, Revision 1.1.1.1

1.1       ohara       1: /* Test file for mpfr_hypot.
                      2:
                      3: Copyright 2001 Free Software Foundation.
                      4: Adapted from tarctan.c.
                      5:
                      6: This file is part of the MPFR Library.
                      7:
                      8: The MPFR Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The MPFR Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Lesser General Public License
                     19: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include <stdio.h>
                     24: #include <limits.h>
                     25: #include <stdlib.h>
                     26: #include "gmp.h"
                     27: #include "gmp-impl.h"
                     28: #include "mpfr.h"
                     29: #include "mpfr-impl.h"
                     30: #include "mpfr-test.h"
                     31:
                     32: #define TEST_FUNCTION mpfr_hypot
                     33:
                     34: int
                     35: main (int argc, char *argv[])
                     36: {
                     37:   unsigned int prec, err, yprec, n, p0 = 2, p1 = 100, N = 100;
                     38:   mp_rnd_t rnd;
                     39:   mpfr_t x1, x2, y, z, t;
                     40:   int inexact, compare, compare2;
                     41:
                     42:   mpfr_init (x1);
                     43:   mpfr_init (x2);
                     44:   mpfr_init (y);
                     45:   mpfr_init (z);
                     46:   mpfr_init (t);
                     47:
                     48:   /* thypot prec - perform one random computation with precision prec */
                     49:   if (argc >= 2)
                     50:     {
                     51:       p0 = p1 = atoi (argv[1]);
                     52:       N = 1;
                     53:     }
                     54:
                     55:   for (prec = p0; prec <= p1; prec++)
                     56:     {
                     57:       mpfr_set_prec (x1, prec);
                     58:       mpfr_set_prec (x2, prec);
                     59:       mpfr_set_prec (z, prec);
                     60:       mpfr_set_prec (t, prec);
                     61:       yprec = prec + 10;
                     62:
                     63:       for (n=0; n<N; n++)
                     64:        {
                     65:          mpfr_random(x1);
                     66:          mpfr_random(x2);
                     67:           if (random() % 2)
                     68:            mpfr_neg (x1, x1, GMP_RNDN);
                     69:           if (random() % 2)
                     70:            mpfr_neg (x2, x2, GMP_RNDN);
                     71:          rnd = random () % 4;
                     72:          mpfr_set_prec (y, yprec);
                     73:
                     74:          compare =TEST_FUNCTION (y, x1,x2, rnd);
                     75:          err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
                     76:          if (mpfr_can_round (y, err, rnd, rnd, prec))
                     77:            {
                     78:              mpfr_set (t, y, rnd);
                     79:              inexact = TEST_FUNCTION (z, x1,x2, rnd);
                     80:              if (mpfr_cmp (t, z))
                     81:                {
                     82:                  printf ("results differ for x1=");
                     83:                  mpfr_out_str (stdout, 2, prec, x1, GMP_RNDN);
                     84:                  printf ("\n et x2=");
                     85:                  mpfr_out_str (stdout, 2, prec, x2, GMP_RNDN);
                     86:                  printf (" \n prec=%u rnd_mode=%s\n", prec,
                     87:                          mpfr_print_rnd_mode (rnd));
                     88:                  printf ("   got ");
                     89:                   mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
                     90:                  putchar ('\n');
                     91:                  printf ("   expected ");
                     92:                  mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
                     93:                  putchar ('\n');
                     94:                  printf ("   approximation was ");
                     95:                  mpfr_print_binary (y);
                     96:                  putchar ('\n');
                     97:                  exit (1);
                     98:                }
                     99:              compare2 = mpfr_cmp (t, y);
                    100:              /* if rounding to nearest, cannot know the sign of t - f(x)
                    101:                 because of composed rounding: y = o(f(x)) and t = o(y) */
                    102:              if ((rnd != GMP_RNDN) && (compare * compare2 >= 0))
                    103:                compare = compare + compare2;
                    104:              else
                    105:                compare = inexact; /* cannot determine sign(t-f(x)) */
                    106:              if (((inexact == 0) && (compare != 0)) ||
                    107:                  ((inexact > 0) && (compare <= 0)) ||
                    108:                  ((inexact < 0) && (compare >= 0)))
                    109:               {
                    110:                  fprintf (stderr, "Wrong inexact flag for rnd=%s: expected %d, got %d\n",
                    111:                           mpfr_print_rnd_mode (rnd), compare, inexact);
                    112:                  printf ("x1="); mpfr_print_binary (x1); putchar ('\n');
                    113:                  printf ("x2="); mpfr_print_binary (x2); putchar ('\n');
                    114:                  printf ("t="); mpfr_print_binary (t); putchar ('\n');
                    115:                  exit (1);
                    116:               }
                    117:            }
                    118:        }
                    119:     }
                    120:
                    121:   mpfr_clear (x1);
                    122:   mpfr_clear (x2);
                    123:   mpfr_clear (y);
                    124:   mpfr_clear (z);
                    125:   mpfr_clear (t);
                    126:
                    127:   return 0;
                    128: }
                    129:
                    130:
                    131:
                    132: