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b58ddff026
* merged mpfr 3.0.0 and gmp 5.0.1 in buildtools trunk git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@37378 a95241bf-73f2-0310-859d-f6bbb57e9c96
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* mpfr_reldiff -- compute relative difference of two floating-point numbers.
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Copyright 2000, 2001, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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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/* reldiff(b, c) = abs(b-c)/b */
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void
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mpfr_reldiff (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode)
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{
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mpfr_t b_copy;
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if (MPFR_ARE_SINGULAR (b, c))
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{
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if (MPFR_IS_NAN(b) || MPFR_IS_NAN(c))
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{
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MPFR_SET_NAN(a);
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return;
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}
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else if (MPFR_IS_INF(b))
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{
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if (MPFR_IS_INF (c) && (MPFR_SIGN (c) == MPFR_SIGN (b)))
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MPFR_SET_ZERO(a);
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else
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MPFR_SET_NAN(a);
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return;
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}
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else if (MPFR_IS_INF(c))
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{
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MPFR_SET_SAME_SIGN (a, b);
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MPFR_SET_INF (a);
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return;
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}
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else if (MPFR_IS_ZERO(b)) /* reldiff = abs(c)/c = sign(c) */
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{
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mpfr_set_si (a, MPFR_INT_SIGN (c), rnd_mode);
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return;
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}
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/* Fall through */
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}
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if (a == b)
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{
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mpfr_init2 (b_copy, MPFR_PREC(b));
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mpfr_set (b_copy, b, MPFR_RNDN);
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}
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mpfr_sub (a, b, c, rnd_mode);
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mpfr_abs (a, a, rnd_mode); /* for compatibility with MPF */
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mpfr_div (a, a, (a == b) ? b_copy : b, rnd_mode);
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if (a == b)
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mpfr_clear (b_copy);
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}
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