125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/* Test mpf_get_d_2exp.
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Copyright 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP 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 2.1 of the License, or (at your
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option) any later version.
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The GNU MP 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 MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "mpir.h"
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#include "gmp-impl.h"
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#include "tests.h"
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static void
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check_onebit (void)
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{
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static const long data[] = {
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-513, -512, -511, -65, -64, -63, -32, -1,
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0, 1, 32, 53, 54, 64, 128, 256, 511, 512, 513
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};
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mpf_t f;
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double got, want;
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long got_exp, want_exp;
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int i,sign;
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mpf_init2(f,1024L);
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for(sign=-1;sign<=1;sign+=2){
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for (i = 0; i < numberof (data); i++)
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{
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mpf_set_ui (f, 1L);if(sign==-1)mpf_neg(f,f);
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if (data[i] >= 0)
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mpf_mul_2exp (f, f, data[i]);
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else
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mpf_div_2exp (f, f, -data[i]);
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want = 0.5*sign;
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want_exp = data[i] + 1;
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got = mpf_get_d_2exp (&got_exp, f);
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if (got != want || got_exp != want_exp)
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{
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printf ("mpf_get_d_2exp wrong on 2**%ld\n", data[i]);
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mpf_trace (" f ", f);
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d_trace (" want ", want);
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d_trace (" got ", got);
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printf (" want exp %ld\n", want_exp);
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printf (" got exp %ld\n", got_exp);
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abort();
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}
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}}
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mpf_clear (f);
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}
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/* Check that hardware rounding doesn't make mpf_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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mpf_t f;
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double got;
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long got_exp;
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int i, rnd_mode, old_rnd_mode;
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mpf_init2 (f, 1024L);
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old_rnd_mode = tests_hardware_getround ();
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for (rnd_mode = 0; rnd_mode < 4; rnd_mode++)
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{
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tests_hardware_setround (rnd_mode);
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for (i = 0; i < numberof (data); i++)
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{
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mpf_set_ui (f, 1L);
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mpf_mul_2exp (f, f, data[i]);
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mpf_sub_ui (f, f, 1L);
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got = mpf_get_d_2exp (&got_exp, f);
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if (got < 0.5 || got >= 1.0)
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{
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printf ("mpf_get_d_2exp bad 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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mpf_trace (" f ", f);
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d_trace (" got ", got);
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printf (" got exp %ld\n", got_exp);
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abort();
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}
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}
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}
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mpf_clear (f);
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tests_hardware_setround (old_rnd_mode);
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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 ();
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mp_trace_base = 16;
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check_onebit ();
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check_round ();
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tests_end ();
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exit (0);
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}
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