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

1.1       ohara       1: /* Test file for mpfr_sqrt_ui.
                      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 <math.h>
                     23: #include <stdio.h>
                     24: #include <stdlib.h>
                     25: #include <time.h>
                     26: #include "gmp.h"
                     27: #include "mpfr.h"
                     28: #include "mpfr-test.h"
                     29:
                     30: void check _PROTO((unsigned long, mp_rnd_t, double));
                     31:
                     32: int maxulp=0;
                     33:
                     34: void
                     35: check (unsigned long a, mp_rnd_t rnd_mode, double Q)
                     36: {
                     37:   mpfr_t q; double Q2; int u, ck;
                     38:
                     39:   mpfr_init2(q, 53);
                     40: #ifdef MPFR_HAVE_FESETROUND
                     41:   mpfr_set_machine_rnd_mode(rnd_mode);
                     42: #endif
                     43:   mpfr_sqrt_ui(q, a, rnd_mode);
                     44:   ck = (Q >= 0.0);
                     45:   if (!ck) Q = sqrt(1.0 * a);
                     46:   Q2 = mpfr_get_d1 (q);
                     47:   if (Q!=Q2 && (!isnan(Q) || !isnan(Q2))) {
                     48:     u = ulp(Q2,Q);
                     49:     if (ck) printf("mpfr_sqrt_ui failed");
                     50:     else printf("mpfr_sqrt_ui differs from sqrt");
                     51:     printf(" for a=%lu, rnd_mode=%s\n",
                     52:           a, mpfr_print_rnd_mode(rnd_mode));
                     53:     printf("sqrt gives %1.20e, mpfr_sqrt_ui gives %1.20e (%d ulp)\n",Q,Q2,u);
                     54:     exit(1);
                     55:   }
                     56:   mpfr_clear(q);
                     57: }
                     58:
                     59: double five = 5.0;
                     60:
                     61: int
                     62: main (void)
                     63: {
                     64: #ifdef MPFR_HAVE_FESETROUND
                     65:   int i;
                     66:   unsigned long a;
                     67:
                     68:   mpfr_test_init ();
                     69:
                     70:   /* On Debian potato glibc 2.1.3-18, sqrt() doesn't seem to respect
                     71:      fesetround. */
                     72:   {
                     73:     double  a, b;
                     74:     mpfr_set_machine_rnd_mode (GMP_RNDU);
                     75:     a = sqrt (five);
                     76:     mpfr_set_machine_rnd_mode (GMP_RNDD);
                     77:     b = sqrt (five);
                     78:     if (a == b)
                     79:       {
                     80:         printf ("Tests suppressed, mpfr_set_machine_rnd_mode doesn't affect sqrt()\n");
                     81:         goto nogood;
                     82:       }
                     83:   }
                     84:
                     85:   SEED_RAND (time(NULL));
                     86:   for (i=0;i<1000000;i++)
                     87:     {
                     88:       a = LONG_RAND();
                     89:       /* machine arithmetic must agree if a <= 2.0^53 */
                     90:       if (1.0*a < 9007199254872064.0)
                     91:         check(a, LONG_RAND() % 4, -1.0);
                     92:     }
                     93:  nogood:
                     94: #endif
                     95:
                     96:   check (0, GMP_RNDN, 0.0);
                     97:   check (2116118, GMP_RNDU, 1.45468828276026215e3);
                     98:
                     99:   return 0;
                    100: }