mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
108 lines
2.3 KiB
C
108 lines
2.3 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("d_log_upper_bound....");
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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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mpfr_t t;
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double x, y, z;
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mpfr_init2(t, 53);
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x = d_randtest2(state);
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x = ldexp(x, 100 - n_randint(state, 200));
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switch (n_randint(state, 10))
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{
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case 0:
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x = 1.0 + x;
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break;
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case 1:
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x = 1.0 - x;
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break;
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case 2:
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x = D_INF;
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break;
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case 3:
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x = 0.0;
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break;
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case 4:
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x = D_NAN;
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break;
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default:
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break;
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}
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y = mag_d_log_upper_bound(x);
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mpfr_set_d(t, x, MPFR_RNDD);
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mpfr_log(t, t, MPFR_RNDU);
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z = mpfr_get_d(t, MPFR_RNDD);
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if (y < z || fabs(y-z) > 0.000001 * fabs(z))
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{
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flint_printf("FAIL\n");
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flint_printf("x = %.20g\n", x);
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flint_printf("y = %.20g\n", y);
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flint_printf("z = %.20g\n", z);
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abort();
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}
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mpfr_clear(t);
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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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