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Annotation of OpenXM_contrib/gmp/mpfr/tests/tconst_log2.c, Revision 1.1.1.1

1.1       ohara       1: /* Test file for mpfr_const_log2.
                      2:
                      3: Copyright 1999, 2001 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 "gmp-impl.h"
                     26: #include "mpfr.h"
                     27: #include "mpfr-impl.h"
                     28:
                     29: /* tlog2 [prec] [rnd] [0 = no print] */
                     30:
                     31: void check _PROTO ((mp_prec_t, mp_prec_t));
                     32:
                     33: void
                     34: check (mp_prec_t p0, mp_prec_t p1)
                     35: {
                     36:   mpfr_t x, y, z;
                     37:   mp_rnd_t rnd;
                     38:
                     39:   mpfr_init (x);
                     40:   mpfr_init (y);
                     41:   mpfr_init2 (z, p1 + 10);
                     42:   mpfr_const_log2 (z, GMP_RNDN);
                     43:   __mpfr_const_log2_prec = 1;
                     44:
                     45:   for (; p0<=p1; p0++)
                     46:     {
                     47:       mpfr_set_prec (x, p0);
                     48:       mpfr_set_prec (y, p0);
                     49:       for (rnd = 0; rnd < 4; rnd++)
                     50:         {
                     51:           mpfr_const_log2 (x, rnd);
                     52:           mpfr_set (y, z, rnd);
                     53:           if (mpfr_cmp (x, y) && mpfr_can_round (z, mpfr_get_prec(z), GMP_RNDN,
                     54:                                                  rnd, p0))
                     55:             {
                     56:               fprintf (stderr, "mpfr_const_log2 fails for prec=%u, rnd=%s\n",
                     57:                        (unsigned int) p0, mpfr_print_rnd_mode (rnd));
                     58:               fprintf (stderr, "expected ");
                     59:               mpfr_out_str (stderr, 2, 0, y, GMP_RNDN);
                     60:               fprintf (stderr, "\ngot      ");
                     61:               mpfr_out_str (stderr, 2, 0, x, GMP_RNDN);
                     62:               fprintf (stderr, "\n");
                     63:               exit (1);
                     64:             }
                     65:         }
                     66:     }
                     67:
                     68:   mpfr_clear (x);
                     69:   mpfr_clear (y);
                     70:   mpfr_clear (z);
                     71: }
                     72:
                     73: int
                     74: main (int argc, char *argv[])
                     75: {
                     76:   mpfr_t x;
                     77:   int p;
                     78:   mp_rnd_t rnd;
                     79:
                     80:   p = (argc>1) ? atoi(argv[1]) : 53;
                     81:   rnd = (argc>2) ? atoi(argv[2]) : GMP_RNDZ;
                     82:
                     83:   mpfr_init (x);
                     84:
                     85:   check (2, 1000);
                     86:
                     87:   /* check precision of 2 bits */
                     88:   mpfr_set_prec (x, 2);
                     89:   mpfr_const_log2 (x, GMP_RNDN);
                     90:   if (mpfr_get_d1 (x) != 0.75)
                     91:     {
                     92:       fprintf (stderr, "mpfr_const_log2 failed for prec=2, rnd=GMP_RNDN\n");
                     93:       fprintf (stderr, "expected 0.75, got %f\n", mpfr_get_d1 (x));
                     94:       exit (1);
                     95:     }
                     96:
                     97:   if (argc>=2)
                     98:     {
                     99:       mpfr_set_prec (x, p);
                    100:       mpfr_const_log2 (x, rnd);
                    101:       printf ("log(2)=");
                    102:       mpfr_out_str (stdout, 10, 0, x, rnd);
                    103:       putchar('\n');
                    104:     }
                    105:
                    106:   mpfr_set_prec (x, 53);
                    107:   mpfr_const_log2 (x, rnd);
                    108:   if (mpfr_get_d1 (x) != 6.9314718055994530941e-1)
                    109:     {
                    110:       fprintf (stderr, "mpfr_const_log2 failed for prec=53\n");
                    111:       exit (1);
                    112:     }
                    113:
                    114:   mpfr_clear(x);
                    115:
                    116:   return 0;
                    117: }