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