51c586b89d
GNU MP is a library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. It has a rich set of functions, and the functions have a regular interface. GMP is necessary for GCC >= 4.2.
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/* mpf_set_d -- Assign a float from a double.
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Copyright 1993, 1994, 1995, 1996, 2001, 2003, 2004 Free Software Foundation,
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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 3 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. If not, see http://www.gnu.org/licenses/. */
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#include "config.h"
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#if HAVE_FLOAT_H
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#include <float.h> /* for DBL_MAX */
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#endif
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpf_set_d (mpf_ptr r, double d)
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{
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int negative;
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DOUBLE_NAN_INF_ACTION (d,
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__gmp_invalid_operation (),
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__gmp_invalid_operation ());
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if (UNLIKELY (d == 0))
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{
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SIZ(r) = 0;
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EXP(r) = 0;
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return;
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}
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negative = d < 0;
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d = ABS (d);
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SIZ(r) = negative ? -LIMBS_PER_DOUBLE : LIMBS_PER_DOUBLE;
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EXP(r) = __gmp_extract_double (PTR(r), d);
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}
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