55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT 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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FLINT 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 FLINT; 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) 2012 Fredrik Johansson
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******************************************************************************/
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#include "double_extras.h"
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#include "ulong_extras.h"
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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_randtest(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_randlimb(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_randlimb(state) | (UWORD(1) << (FLINT_BITS - 1));
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m2 = n_randlimb(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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