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author | ryde <ryde@280ebfd0-de03-0410-8827-d642c229c3f4> | 2003-07-19 00:15:46 +0000 |
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committer | ryde <ryde@280ebfd0-de03-0410-8827-d642c229c3f4> | 2003-07-19 00:15:46 +0000 |
commit | 30842a976bef1c1ed64b49aaaecd403834143da6 (patch) | |
tree | 4ab2b0ef00fbef21f20ae5b06767794d6e0ccd43 /tests/tget_d_2exp.c | |
parent | 7d6167d33a3b1ddcd1500dc7b70b7e949b28cd88 (diff) | |
download | mpfr-30842a976bef1c1ed64b49aaaecd403834143da6.tar.gz |
New file, partly derived from tget_d.c.
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2386 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'tests/tget_d_2exp.c')
-rw-r--r-- | tests/tget_d_2exp.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/tests/tget_d_2exp.c b/tests/tget_d_2exp.c new file mode 100644 index 000000000..2a7b42fcc --- /dev/null +++ b/tests/tget_d_2exp.c @@ -0,0 +1,123 @@ +/* Test mpfr_get_d_2exp. + +Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation. + +This file is part of the MPFR Library. + +The 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 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 MPFR Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include <stdio.h> +#include <stdlib.h> +#include <float.h> +#include "gmp.h" +#include "gmp-impl.h" +#include "mpfr.h" +#include "mpfr-impl.h" +#include "mpfr-test.h" + + +/* Check that hardware rounding doesn't make mpfr_get_d_2exp return a value + outside its defined range. */ +static void +check_round (void) +{ + static const unsigned long data[] = { 1, 32, 53, 54, 64, 128, 256, 512 }; + mpfr_t f; + double got; + long got_exp; + int i, rnd_mode, neg; + + mpfr_init2 (f, 1024L); + + for (rnd_mode = 0; rnd_mode < 4; rnd_mode++) + { + for (i = 0; i < numberof (data); i++) + { + mpfr_set_ui (f, 1L, GMP_RNDZ); + mpfr_mul_2exp (f, f, data[i], GMP_RNDZ); + mpfr_sub_ui (f, f, 1L, GMP_RNDZ); + + for (neg = 0; neg <= 1; neg++) + { + got = mpfr_get_d_2exp (&got_exp, f, rnd_mode); + + if (neg == 0 + ? (got < 0.5 || got >= 1.0) + : (got <= -1.0 || got > -0.5)) + { + printf ("mpfr_get_d_2exp wrong on 2**%lu-1\n", data[i]); + printf ("result out of range, expect 0.5 <= got < 1.0\n"); + printf (" rnd_mode = %d\n", rnd_mode); + printf (" data[i] = %lu\n", data[i]); + printf (" f "); + mpfr_out_str (stdout, 2, 0, f, GMP_RNDN); + printf ("\n"); + d_trace (" got ", got); + printf (" got exp %ld\n", got_exp); + abort(); + } + + mpfr_neg (f, f, GMP_RNDZ); + } + } + } + + mpfr_clear (f); +} + + +static void +check_inf_nan () +{ + /* only if nans and infs are available */ +#if _GMP_IEEE_FLOATS + mpfr_t x; + double d; + long exp; + + mpfr_init2 (x, 123); + + mpfr_set_inf (x, 1); + d = mpfr_get_d_2exp (&exp, x, GMP_RNDZ); + ASSERT_ALWAYS (d > 0); + ASSERT_ALWAYS (DOUBLE_ISINF (d)); + + mpfr_set_inf (x, -1); + d = mpfr_get_d_2exp (&exp, x, GMP_RNDZ); + ASSERT_ALWAYS (d < 0); + ASSERT_ALWAYS (DOUBLE_ISINF (d)); + + mpfr_set_nan (x); + d = mpfr_get_d_2exp (&exp, x, GMP_RNDZ); + ASSERT_ALWAYS (DOUBLE_ISNAN (d)); + + mpfr_clear (x); +#endif +} + + +int +main (void) +{ + tests_start_mpfr (); + mpfr_test_init (); + + check_round (); + check_inf_nan (); + + tests_end_mpfr (); + return 0; +} |