mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
/*
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Copyright (C) 2014 Fredrik Johansson
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "flint/double_extras.h"
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#include "mag.h"
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/* XXX: d_randtest is not good enough */
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#define EXP_MINUS_32 2.3283064365386962891e-10
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#define EXP_MINUS_64 5.42101086242752217e-20
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double
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d_randtest2(flint_rand_t state)
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{
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mp_limb_t m1, m2;
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double t;
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if (FLINT_BITS == 64)
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{
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m1 = n_randtest(state) | (UWORD(1) << (FLINT_BITS - 1));
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t = ((double) m1) * EXP_MINUS_64;
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}
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else
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{
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m1 = n_randtest(state) | (UWORD(1) << (FLINT_BITS - 1));
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m2 = n_randtest(state);
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t = ((double) m1) * EXP_MINUS_32 +
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((double) m2) * EXP_MINUS_64;
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}
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return t;
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}
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int main()
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{
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slong iter;
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flint_rand_t state;
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flint_printf("set_d_2exp_fmpz....");
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fflush(stdout);
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flint_randinit(state);
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for (iter = 0; iter < 100000 * arb_test_multiplier(); iter++)
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{
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fmpr_t a, b, c;
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fmpz_t e;
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mag_t m;
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double x;
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fmpr_init(a);
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fmpr_init(b);
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fmpr_init(c);
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fmpz_init(e);
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mag_init(m);
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x = d_randtest2(state);
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x = ldexp(x, 100 - n_randint(state, 200));
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if (n_randint(state, 100) == 0)
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x = 0.0;
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fmpz_randtest(e, state, 10);
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fmpr_set_d(a, x);
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fmpr_mul_2exp_fmpz(a, a, e);
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mag_set_d_2exp_fmpz(m, x, e);
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mag_get_fmpr(b, m);
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fmpr_set(c, a);
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fmpr_mul_ui(c, c, 1025, MAG_BITS, FMPR_RND_UP);
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fmpr_mul_2exp_si(c, c, -10);
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MAG_CHECK_BITS(m)
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if (!(fmpr_cmpabs(a, b) <= 0 && fmpr_cmpabs(b, c) <= 0))
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{
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flint_printf("FAIL\n\n");
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flint_printf("a = "); fmpr_print(a); flint_printf("\n\n");
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flint_printf("b = "); fmpr_print(b); flint_printf("\n\n");
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flint_printf("c = "); fmpr_print(c); flint_printf("\n\n");
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abort();
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}
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fmpr_clear(a);
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fmpr_clear(b);
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fmpr_clear(c);
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fmpz_clear(e);
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mag_clear(m);
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}
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flint_randclear(state);
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flint_cleanup();
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flint_printf("PASS\n");
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return EXIT_SUCCESS;
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}
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