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Annotation of OpenXM_contrib/gmp/mpfr/tests/tabs.c, Revision 1.1

1.1     ! ohara       1: /* Test file for mpfr_abs.
        !             2:
        !             3: Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the MPFR Library.
        !             6:
        !             7: The MPFR Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The MPFR Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser General Public License
        !            18: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include <stdio.h>
        !            23: #include <stdlib.h>
        !            24: #include "gmp.h"
        !            25: #include "mpfr.h"
        !            26: #include "mpfr-impl.h"
        !            27: #include "mpfr-test.h"
        !            28:
        !            29: void check_inexact _PROTO((void));
        !            30:
        !            31: void
        !            32: check_inexact (void)
        !            33: {
        !            34:   mp_prec_t p, q;
        !            35:   mpfr_t x, y, absx;
        !            36:   mp_rnd_t rnd;
        !            37:   int inexact, cmp;
        !            38:
        !            39:   mpfr_init (x);
        !            40:   mpfr_init (y);
        !            41:   mpfr_init (absx);
        !            42:
        !            43:   for (p=2; p<500; p++)
        !            44:     {
        !            45:       mpfr_set_prec (x, p);
        !            46:       mpfr_set_prec (absx, p);
        !            47:       mpfr_random (x);
        !            48:       if (LONG_RAND () % 2)
        !            49:        {
        !            50:          mpfr_set (absx, x, GMP_RNDN);
        !            51:          mpfr_neg (x, x, GMP_RNDN);
        !            52:        }
        !            53:       else
        !            54:        mpfr_set (absx, x, GMP_RNDN);
        !            55:       for (q=2; q<2*p; q++)
        !            56:        {
        !            57:          mpfr_set_prec (y, q);
        !            58:          for (rnd=0; rnd<4; rnd++)
        !            59:            {
        !            60:              inexact = mpfr_abs (y, x, rnd);
        !            61:              cmp = mpfr_cmp (y, absx);
        !            62:              if (((inexact == 0) && (cmp != 0)) ||
        !            63:                  ((inexact > 0) && (cmp <= 0)) ||
        !            64:                  ((inexact < 0) && (cmp >= 0)))
        !            65:                {
        !            66:                  fprintf (stderr, "Wrong inexact flag: expected %d, got %d\n", cmp, inexact);
        !            67:                  printf ("x="); mpfr_print_binary (x); putchar ('\n');
        !            68:                  printf ("absx="); mpfr_print_binary (absx); putchar ('\n');
        !            69:                  printf ("y="); mpfr_print_binary (y); putchar ('\n');
        !            70:                  exit (1);
        !            71:                }
        !            72:            }
        !            73:        }
        !            74:     }
        !            75:
        !            76:   mpfr_clear (x);
        !            77:   mpfr_clear (y);
        !            78:   mpfr_clear (absx);
        !            79: }
        !            80:
        !            81: int
        !            82: main (int argc, char *argv[])
        !            83: {
        !            84:    mpfr_t x;
        !            85:    int n, k, rnd;
        !            86:    double d, absd, dd;
        !            87:
        !            88:    mpfr_test_init ();
        !            89:
        !            90:    check_inexact ();
        !            91:
        !            92:    mpfr_init2(x, 53);
        !            93:
        !            94:    mpfr_set_d(x, 1.0, GMP_RNDN);
        !            95:    mpfr_abs(x, x, GMP_RNDN);
        !            96:    if (mpfr_get_d1 (x) != 1.0) {
        !            97:      fprintf(stderr, "Error in mpfr_abs(1.0)\n"); exit(1);
        !            98:    }
        !            99:
        !           100:    mpfr_set_d(x, -1.0, GMP_RNDN);
        !           101:    mpfr_abs(x, x, GMP_RNDN);
        !           102:    if (mpfr_get_d1 (x) != 1.0) {
        !           103:      fprintf(stderr, "Error in mpfr_abs(-1.0)\n"); exit(1);
        !           104:    }
        !           105:
        !           106:    mpfr_set_inf (x, 1);
        !           107:    mpfr_abs (x, x, GMP_RNDN);
        !           108:    if (!mpfr_inf_p(x) || (mpfr_sgn(x) <= 0))
        !           109:      {
        !           110:        fprintf (stderr, "Error in mpfr_abs(Inf).\n");
        !           111:        exit (1);
        !           112:      }
        !           113:
        !           114:    mpfr_set_inf (x, -1);
        !           115:    mpfr_abs (x, x, GMP_RNDN);
        !           116:    if (!mpfr_inf_p(x) || (mpfr_sgn(x) <= 0))
        !           117:      {
        !           118:        fprintf (stderr, "Error in mpfr_abs(-Inf).\n");
        !           119:        exit (1);
        !           120:      }
        !           121:
        !           122:    n = (argc==1) ? 1000000 : atoi(argv[1]);
        !           123:    for (k = 1; k <= n; k++)
        !           124:      {
        !           125:        do
        !           126:         {
        !           127:           d = drand ();
        !           128:           absd = ABS(d);
        !           129:         }
        !           130: #ifdef HAVE_DENORMS
        !           131:        while (0);
        !           132: #else
        !           133:        while (absd <= 2.2e-307);
        !           134: #endif
        !           135:        rnd = LONG_RAND() % 4;
        !           136:        mpfr_set_d (x, d, 0);
        !           137:        mpfr_abs (x, x, rnd);
        !           138:        dd = mpfr_get_d1 (x);
        !           139:        if (!isnan(d) && (dd != absd))
        !           140:         {
        !           141:           fprintf(stderr,
        !           142:                   "Mismatch on d = %.20e\n", d);
        !           143:           fprintf(stderr, "dd=%.20e\n", dd);
        !           144:           mpfr_print_binary(x); putchar('\n');
        !           145:           exit(1);
        !           146:         }
        !           147:      }
        !           148:
        !           149:    mpfr_clear(x);
        !           150:
        !           151:    return 0;
        !           152: }