efee5258bc
The MPFR library is a C library for multiple-precision floating-point computations with exact rounding (also called correct rounding). It is based on the GMP multiple-precision library and should replace the MPF class in further releases of GMP. GCC >= 4.2 requires MPFR.
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* mpfr_add_d -- add a multiple precision floating-point number
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to a machine double precision float
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Copyright 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "mpfr-impl.h"
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int
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mpfr_add_d (mpfr_ptr a, mpfr_srcptr b, double c, mpfr_rnd_t rnd_mode)
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{
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int inexact;
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mpfr_t d;
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MPFR_SAVE_EXPO_DECL (expo);
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MPFR_LOG_FUNC (("b[%#R]=%R c=%.20g rnd=%d", b, b, c, rnd_mode),
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("a[%#R]=%R", a, a));
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MPFR_SAVE_EXPO_MARK (expo);
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mpfr_init2 (d, IEEE_DBL_MANT_DIG);
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inexact = mpfr_set_d (d, c, rnd_mode);
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MPFR_ASSERTN (inexact == 0);
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mpfr_clear_flags ();
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inexact = mpfr_add (a, b, d, rnd_mode);
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MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags);
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mpfr_clear (d);
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MPFR_SAVE_EXPO_FREE (expo);
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return mpfr_check_range (a, inexact, rnd_mode);
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}
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