--- /dev/null
+/* Test file for mpfr_get_d
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MPFR Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LIB. If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <float.h>
+
+#include "mpfr-test.h"
+
+static int
+check_denorms (void)
+{
+ mp_rnd_t rnd_mode;
+ mpfr_t x;
+ double d, d2, dd, f, dbl_min;
+ int fail = 0, k, n;
+
+ /* workaround for gcc bug on m68040-unknown-netbsd1.4.1,
+ where DBL_MIN gives (1-2^(-52))/2^1022 */
+ dbl_min = 1.0;
+ for (d = DBL_MIN; d < 0.9; d *= 2.0)
+ dbl_min /= 2.0;
+
+ mpfr_init2 (x, BITS_PER_MP_LIMB);
+
+ rnd_mode = GMP_RNDN;
+ for (k = -17; k <= 17; k += 2)
+ {
+ d = (double) k * dbl_min; /* k * 2^(-1022) */
+ f = 1.0;
+ mpfr_set_si (x, k, GMP_RNDN);
+ mpfr_div_2exp (x, x, 1022, GMP_RNDN); /* k * 2^(-1022) */
+ for (n = 0; n <= 58; n++)
+ {
+ d2 = d * f;
+ dd = mpfr_get_d (x, rnd_mode);
+ if (d2 != dd) /* should be k * 2^(-1022-n) for n < 53 */
+ {
+ printf ("Wrong result for %d * 2^(%d), rnd_mode %d\n",
+ k, -1022-n, rnd_mode);
+ printf ("got %.20e instead of %.20e\n", dd, d2);
+ fail = 1;
+ }
+ f *= 0.5;
+ mpfr_div_2exp (x, x, 1, GMP_RNDN);
+ }
+ }
+
+ mpfr_clear (x);
+ return fail;
+}
+
+static void
+check_inf_nan (void)
+{
+ /* only if nans and infs are available */
+#if _GMP_IEEE_FLOATS
+ mpfr_t x;
+ double d;
+
+ mpfr_init2 (x, 123);
+
+ mpfr_set_inf (x, 1);
+ d = mpfr_get_d (x, GMP_RNDZ);
+ ASSERT_ALWAYS (d > 0);
+ ASSERT_ALWAYS (DOUBLE_ISINF (d));
+
+ mpfr_set_inf (x, -1);
+ d = mpfr_get_d (x, GMP_RNDZ);
+ ASSERT_ALWAYS (d < 0);
+ ASSERT_ALWAYS (DOUBLE_ISINF (d));
+
+ mpfr_set_nan (x);
+ d = mpfr_get_d (x, GMP_RNDZ);
+ ASSERT_ALWAYS (DOUBLE_ISNAN (d));
+
+ mpfr_clear (x);
+#endif
+}
+
+static void
+check_max (void)
+{
+ double d, e;
+ mpfr_t u;
+
+ d = 1.0;
+ while (d < (DBL_MAX / 2.0))
+ d += d;
+ mpfr_init (u);
+ if (mpfr_set_d (u, d, GMP_RNDN) == 0)
+ {
+ /* If setting is exact */
+ e = (mpfr_get_d1) (u);
+ if (e != d)
+ {
+ printf ("get_d(set_d)(1): %1.20e != %1.20e\n", d, e);
+ exit (1);
+ }
+ }
+
+ mpfr_set_str_binary (u, "-1E1024");
+ d = mpfr_get_d (u, GMP_RNDZ);
+ MPFR_ASSERTN(d == -DBL_MAX);
+ d = mpfr_get_d (u, GMP_RNDU);
+ MPFR_ASSERTN(d == -DBL_MAX);
+ d = mpfr_get_d (u, GMP_RNDN);
+ MPFR_ASSERTN(DOUBLE_ISINF(d) && d < 0.0);
+ d = mpfr_get_d (u, GMP_RNDD);
+ MPFR_ASSERTN(DOUBLE_ISINF(d) && d < 0.0);
+
+ mpfr_set_str_binary (u, "1E1024");
+ d = mpfr_get_d (u, GMP_RNDZ);
+ MPFR_ASSERTN(d == DBL_MAX);
+ d = mpfr_get_d (u, GMP_RNDD);
+ MPFR_ASSERTN(d == DBL_MAX);
+ d = mpfr_get_d (u, GMP_RNDN);
+ MPFR_ASSERTN(DOUBLE_ISINF(d) && d > 0.0);
+ d = mpfr_get_d (u, GMP_RNDU);
+ MPFR_ASSERTN(DOUBLE_ISINF(d) && d > 0.0);
+
+ mpfr_clear (u);
+}
+
+static void
+check_min(void)
+{
+ double d, e;
+ mpfr_t u;
+
+ d = 1.0; while (d > (DBL_MIN * 2.0)) d /= 2.0;
+ mpfr_init(u);
+ if (mpfr_set_d(u, d, GMP_RNDN) == 0)
+ {
+ /* If setting is exact */
+ e = mpfr_get_d1(u);
+ if (e != d)
+ {
+ printf("get_d(set_d)(2): %1.20e != %1.20e\n", d, e);
+ exit(1);
+ }
+ }
+ mpfr_clear(u);
+}
+
+int
+main (void)
+{
+ tests_start_mpfr ();
+ mpfr_test_init ();
+
+#ifndef MPFR_DOUBLE_SPEC
+ printf ("Warning! The MPFR_DOUBLE_SPEC macro is not defined. This means\n"
+ "that you do not have a conforming C implementation and problems\n"
+ "may occur with conversions between MPFR numbers and standard\n"
+ "floating-point types. Please contact the MPFR team.\n");
+#elif MPFR_DOUBLE_SPEC == 0
+ /*
+ printf ("The type 'double' of your C implementation does not seem to\n"
+ "correspond to the IEEE-754 double precision. Though code has\n"
+ "been written to support such implementations, tests have been\n"
+ "done only on IEEE-754 double-precision implementations and\n"
+ "conversions between MPFR numbers and standard floating-point\n"
+ "types may be inaccurate. You may wish to contact the MPFR team\n"
+ "for further testing.\n");
+ */
+ printf ("The type 'double' of your C implementation does not seem to\n"
+ "correspond to the IEEE-754 double precision. Such particular\n"
+ "implementations are not supported yet, and conversions between\n"
+ "MPFR numbers and standard floating-point types may be very\n"
+ "inaccurate.\n");
+ printf ("FLT_RADIX = %ld\n", (long) FLT_RADIX);
+ printf ("DBL_MANT_DIG = %ld\n", (long) DBL_MANT_DIG);
+ printf ("DBL_MIN_EXP = %ld\n", (long) DBL_MIN_EXP);
+ printf ("DBL_MAX_EXP = %ld\n", (long) DBL_MAX_EXP);
+#endif
+
+ if (check_denorms ())
+ exit (1);
+
+ check_inf_nan ();
+ check_min();
+ check_max();
+
+ tests_end_mpfr ();
+ return 0;
+}
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