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118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/* Test mpfr_get_d_2exp.
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Copyright 1999-2025 Free Software Foundation, Inc.
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Contributed by the Pascaline and Caramba projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER.
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If not, see <https://www.gnu.org/licenses/>. */
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#include <float.h>
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#include "mpfr-test.h"
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/* Check that hardware rounding doesn't make mpfr_get_d_2exp return a value
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outside its defined range. */
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static void
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check_round (void)
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{
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static const unsigned long data[] = { 1, 32, 53, 54, 64, 128, 256, 512 };
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mpfr_t f;
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double got;
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long got_exp;
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int i, rnd_mode, neg;
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mpfr_init2 (f, 1024L);
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RND_LOOP (rnd_mode)
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{
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for (i = 0; i < (int) numberof (data); i++)
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{
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mpfr_set_ui (f, 1L, MPFR_RNDZ);
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mpfr_mul_2ui (f, f, data[i], MPFR_RNDZ);
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mpfr_sub_ui (f, f, 1L, MPFR_RNDZ);
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for (neg = 0; neg <= 1; neg++)
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{
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got = mpfr_get_d_2exp (&got_exp, f, (mpfr_rnd_t) rnd_mode);
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if (neg == 0
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? (got < 0.5 || got >= 1.0)
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: (got <= -1.0 || got > -0.5))
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{
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printf ("mpfr_get_d_2exp wrong on 2**%lu-1\n", data[i]);
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printf ("result out of range, expect 0.5 <= got < 1.0\n");
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printf (" rnd_mode = %d\n", rnd_mode);
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printf (" data[i] = %lu\n", data[i]);
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printf (" f ");
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mpfr_out_str (stdout, 2, 0, f, MPFR_RNDN);
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printf ("\n");
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d_trace (" got ", got);
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printf (" got exp %ld\n", got_exp);
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exit(1);
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}
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mpfr_neg (f, f, MPFR_RNDZ);
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}
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}
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}
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mpfr_clear (f);
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}
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static void
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check_inf_nan (void)
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{
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#if !defined(MPFR_ERRDIVZERO)
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mpfr_t x;
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double d;
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long exp;
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mpfr_init2 (x, 123);
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mpfr_set_inf (x, 1);
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d = mpfr_get_d_2exp (&exp, x, MPFR_RNDZ);
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MPFR_ASSERTN (d > 0);
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MPFR_ASSERTN (DOUBLE_ISINF (d));
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mpfr_set_inf (x, -1);
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d = mpfr_get_d_2exp (&exp, x, MPFR_RNDZ);
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MPFR_ASSERTN (d < 0);
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MPFR_ASSERTN (DOUBLE_ISINF (d));
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mpfr_set_nan (x);
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d = mpfr_get_d_2exp (&exp, x, MPFR_RNDZ);
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MPFR_ASSERTN (DOUBLE_ISNAN (d));
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mpfr_clear (x);
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#endif
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}
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int
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main (void)
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{
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tests_start_mpfr ();
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mpfr_test_init ();
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check_round ();
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check_inf_nan ();
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tests_end_mpfr ();
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return 0;
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}
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