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