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Annotation of OpenXM_contrib/gmp/mpf/tests/t-dm2exp.c, Revision 1.1

1.1     ! maekawa     1: /* Test mpf_div, mpf_div_2exp, mpf_mul_2exp.
        !             2:
        !             3: Copyright (C) 1996 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP 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 Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            18: along with the GNU MP 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 "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25: #include "urandom.h"
        !            26:
        !            27: #ifndef SIZE
        !            28: #define SIZE 16
        !            29: #endif
        !            30:
        !            31: main (argc, argv)
        !            32:      int argc;
        !            33:      char **argv;
        !            34: {
        !            35:   int reps = 500000;
        !            36:   int i;
        !            37:   mpf_t u, v, w1, w2;
        !            38:   mp_size_t bprec = 100;
        !            39:   mpf_t rerr, limit_rerr;
        !            40:
        !            41:   if (argc > 1)
        !            42:     {
        !            43:       reps = strtol (argv[1], 0, 0);
        !            44:       if (argc > 2)
        !            45:        bprec = strtol (argv[2], 0, 0);
        !            46:     }
        !            47:
        !            48:   mpf_set_default_prec (bprec);
        !            49:
        !            50:   mpf_init (rerr);
        !            51:   mpf_init (limit_rerr);
        !            52:
        !            53:   mpf_init (u);
        !            54:   mpf_init (v);
        !            55:   mpf_init (w1);
        !            56:   mpf_init (w2);
        !            57:
        !            58:   for (i = 0; i < reps; i++)
        !            59:     {
        !            60:       mp_size_t res_prec;
        !            61:       unsigned long int pow2;
        !            62:
        !            63:       res_prec = urandom () % (bprec + 100);
        !            64:       mpf_set_prec (w1, res_prec);
        !            65:       mpf_set_prec (w2, res_prec);
        !            66:
        !            67:       mpf_set_ui (limit_rerr, 1);
        !            68:       mpf_div_2exp (limit_rerr, limit_rerr, res_prec);
        !            69:
        !            70:       pow2 = urandom () % 0x10000;
        !            71:       mpf_set_ui (v, 1);
        !            72:       mpf_mul_2exp (v, v, pow2);
        !            73:
        !            74:       mpf_div_2exp (w1, u, pow2);
        !            75:       mpf_div (w2, u, v);
        !            76:       mpf_reldiff (rerr, w1, w2);
        !            77:       if (mpf_cmp (rerr, limit_rerr) > 0)
        !            78:        {
        !            79:          printf ("ERROR in mpf_div or mpf_div_2exp after %d tests\n", i);
        !            80:          printf ("   u = "); mpf_dump (u);
        !            81:          printf ("   v = "); mpf_dump (v);
        !            82:          printf ("  w1 = "); mpf_dump (w1);
        !            83:          printf ("  w2 = "); mpf_dump (w2);
        !            84:          abort ();
        !            85:        }
        !            86:     }
        !            87:
        !            88:   exit (0);
        !            89: }
        !            90:
        !            91: oo (x)
        !            92:      mpf_t x;
        !            93: {
        !            94:   mp_size_t i;
        !            95:   printf (" exp = %ld\n", x->_mp_exp);
        !            96:   printf ("size = %d\n", x->_mp_size);
        !            97:   for (i = ABS (x->_mp_size) - 1; i >= 0; i--)
        !            98:     printf ("%08lX ", x->_mp_d[i]);
        !            99:   printf ("\n");
        !           100:   mpf_dump (x);
        !           101: }