mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2013 Fredrik Johansson
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******************************************************************************/
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#include "fmprb.h"
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int main()
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{
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long iter;
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flint_rand_t state;
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printf("div_2expm1_ui....");
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fflush(stdout);
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flint_randinit(state);
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for (iter = 0; iter < 100000; iter++)
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{
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fmprb_t a, b, c;
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ulong n;
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long prec, acc1, acc2;
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fmpz_t t;
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fmprb_init(a);
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fmprb_init(b);
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fmprb_init(c);
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fmpz_init(t);
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prec = 2 + n_randint(state, 10000);
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fmprb_randtest(a, state, 1 + n_randint(state, 10000), 10);
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n = 1 + (n_randtest(state) % (10 * prec));
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fmprb_div_2expm1_ui(b, a, n, prec);
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fmprb_one(c);
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fmpz_set_ui(fmpr_expref(fmprb_midref(c)), n);
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fmprb_sub_ui(c, c, 1, prec);
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fmprb_div(c, a, c, prec);
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acc1 = fmprb_rel_accuracy_bits(a);
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acc2 = fmprb_rel_accuracy_bits(b);
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if (!fmprb_overlaps(b, c))
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{
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printf("FAIL: containment\n\n");
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printf("a = "); fmprb_print(a); printf("\n\n");
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printf("b = "); fmprb_print(b); printf("\n\n");
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printf("c = "); fmprb_print(c); printf("\n\n");
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abort();
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}
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if ((acc2 < FLINT_MIN(prec, acc1) - 10) &&
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!(acc1 == -FMPR_PREC_EXACT && acc2 == -FMPR_PREC_EXACT))
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{
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printf("FAIL: poor accuracy\n\n");
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printf("prec=%ld, acc1=%ld, acc2=%ld\n\n", prec, acc1, acc2);
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printf("n = %lu\n\n", n);
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printf("a = "); fmprb_print(a); printf("\n\n");
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printf("b = "); fmprb_print(b); printf("\n\n");
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printf("c = "); fmprb_print(c); printf("\n\n");
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abort();
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}
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fmprb_clear(a);
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fmprb_clear(b);
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fmprb_clear(c);
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fmpz_clear(t);
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}
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flint_randclear(state);
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flint_cleanup();
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printf("PASS\n");
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return EXIT_SUCCESS;
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}
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