Annotation of OpenXM_contrib/gmp/mpfr/tests/tget_d.c, Revision 1.1
1.1 ! ohara 1: /* Test file for mpfr_get_d
! 2:
! 3: Copyright 1999, 2000, 2001, 2002 Free Software Foundation.
! 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 <float.h>
! 25: #include "gmp.h"
! 26: #include "gmp-impl.h"
! 27: #include "mpfr.h"
! 28: #include "mpfr-impl.h"
! 29: #include "mpfr-test.h"
! 30:
! 31: int check_denorms _PROTO ((void));
! 32:
! 33: int
! 34: check_denorms ()
! 35: {
! 36: mp_rnd_t rnd_mode;
! 37: mpfr_t x;
! 38: double d, d2, dd, f;
! 39: int fail = 0, k, n;
! 40:
! 41: mpfr_init2 (x, BITS_PER_MP_LIMB);
! 42:
! 43: for (rnd_mode = 0; rnd_mode <= 3; rnd_mode++)
! 44: {
! 45: #ifdef MPFR_HAVE_FESETROUND
! 46: mpfr_set_machine_rnd_mode (rnd_mode);
! 47: #else
! 48: if (rnd_mode)
! 49: break; /* second iteration */
! 50: rnd_mode = GMP_RNDN;
! 51: #endif
! 52: for (k = -17; k <= 17; k += 2)
! 53: {
! 54: d = k * DBL_MIN; /* k * 2^(-1022) */
! 55: f = 1.0;
! 56: mpfr_set_si (x, k, GMP_RNDN);
! 57: mpfr_div_2exp (x, x, 1022, GMP_RNDN); /* k * 2^(-1022) */
! 58: for (n = 0; n <= 58; n++)
! 59: {
! 60: d2 = d * f;
! 61: dd = mpfr_get_d (x, rnd_mode);
! 62: if (d2 != dd) /* should be k * 2^(-1022-n) for n < 53 */
! 63: {
! 64: fprintf (stderr,
! 65: "Wrong result for %d * 2^(%d), rnd_mode %d\n",
! 66: k, -1022-n, rnd_mode);
! 67: fprintf (stderr, "got %.20e instead of %.20e\n", dd, d2);
! 68: fail = 1;
! 69: }
! 70: f *= 0.5;
! 71: mpfr_div_2exp (x, x, 1, GMP_RNDN);
! 72: }
! 73: }
! 74: }
! 75:
! 76: mpfr_clear (x);
! 77: return fail;
! 78: }
! 79:
! 80: int
! 81: main (void)
! 82: {
! 83:
! 84: #ifdef MPFR_HAVE_FESETROUND
! 85:
! 86: mpfr_t half, x, y;
! 87: mp_rnd_t rnd_mode;
! 88:
! 89: #endif
! 90:
! 91: mpfr_test_init ();
! 92:
! 93: #ifdef MPFR_HAVE_FESETROUND
! 94:
! 95: mpfr_init2(half, 2);
! 96: mpfr_set_ui(half, 1, GMP_RNDZ);
! 97: mpfr_div_2ui(half, half, 1, GMP_RNDZ); /* has exponent 0 */
! 98:
! 99: mpfr_init2(x, 128);
! 100: mpfr_init2(y, 128);
! 101:
! 102: for (rnd_mode = 0; rnd_mode <= 3; rnd_mode++)
! 103: {
! 104: int i, j, si, sj;
! 105: double di, dj;
! 106:
! 107: mpfr_set_machine_rnd_mode (rnd_mode);
! 108: for (i = 1, di = 0.25; i < 127; i++, di *= 0.5)
! 109: for (si = 0; si <= 1; si++)
! 110: {
! 111: mpfr_div_2ui (x, half, i, GMP_RNDZ);
! 112: (si ? mpfr_sub : mpfr_add)(x, half, x, GMP_RNDZ);
! 113: /* x = 1/2 +/- 1/2^(1+i) */
! 114: for (j = i+1, dj = di * 0.5; j < 128 && j < i+53; j++, dj *= 0.5)
! 115: for (sj = 0; sj <= 1; sj++)
! 116: {
! 117: double c, d, dd;
! 118: int exp;
! 119: char *f;
! 120:
! 121: mpfr_div_2ui (y, half, j, GMP_RNDZ);
! 122: (sj ? mpfr_sub : mpfr_add)(y, x, y, GMP_RNDZ);
! 123: /* y = 1/2 +/- 1/2^(1+i) +/- 1/2^(1+j) */
! 124: exp = (LONG_RAND() % 47) - 23;
! 125: mpfr_mul_2si (y, y, exp, GMP_RNDZ);
! 126: if (mpfr_inexflag_p())
! 127: {
! 128: fprintf(stderr, "Error in tget_d: inexact flag for "
! 129: "(i,si,j,sj,rnd,exp) = (%d,%d,%d,%d,%d,%d)\n",
! 130: i, si, j, sj, rnd_mode, exp);
! 131: exit(1);
! 132: }
! 133: dd = si != sj ? di - dj : di + dj;
! 134: d = si ? 0.5 - dd : 0.5 + dd;
! 135: if ((LONG_RAND() / 1024) & 1)
! 136: {
! 137: c = mpfr_get_d (y, rnd_mode);
! 138: f = "mpfr_get_d";
! 139: }
! 140: else
! 141: {
! 142: exp = (LONG_RAND() % 47) - 23;
! 143: c = mpfr_get_d3 (y, exp, rnd_mode);
! 144: f = "mpfr_get_d3";
! 145: if (si) /* then real d < 0.5 */
! 146: d *= sj && i == 1 ? 4 : 2; /* normalize real d */
! 147: }
! 148: if (exp > 0)
! 149: d *= 1 << exp;
! 150: if (exp < 0)
! 151: d /= 1 << -exp;
! 152: if (c != d)
! 153: {
! 154: fprintf (stderr, "Error in tget_d (%s) for "
! 155: "(i,si,j,sj,rnd,exp) = (%d,%d,%d,%d,%d,%d)\n"
! 156: "got %.25Le instead of %.25Le\n"
! 157: "Difference: %.19e\n",
! 158: f, i, si, j, sj, rnd_mode, exp,
! 159: (long double) c, (long double) d, d - c);
! 160: exit (1);
! 161: }
! 162: }
! 163: }
! 164: }
! 165:
! 166: mpfr_clear(half);
! 167: mpfr_clear(x);
! 168: mpfr_clear(y);
! 169:
! 170: #endif
! 171:
! 172: if (check_denorms ())
! 173: exit (1);
! 174:
! 175: return 0;
! 176: }
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