1 /* mpfr_cmpabs -- compare the absolute values of two FP numbers
3 Copyright 1999, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramel projects, INRIA.
6 This file is part of the GNU MPFR Library.
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
13 The GNU MPFR Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
23 #include "mpfr-impl.h"
25 /* Return a positive value if abs(b) > abs(c), 0 if abs(b) = abs(c), and
26 a negative value if abs(b) < abs(c). Neither b nor c may be NaN. */
29 mpfr_cmpabs (mpfr_srcptr b, mpfr_srcptr c)
35 if (MPFR_ARE_SINGULAR (b, c))
37 if (MPFR_IS_NAN (b) || MPFR_IS_NAN (c))
42 else if (MPFR_IS_INF (b))
43 return ! MPFR_IS_INF (c);
44 else if (MPFR_IS_INF (c))
46 else if (MPFR_IS_ZERO (c))
47 return ! MPFR_IS_ZERO (b);
52 MPFR_ASSERTD (MPFR_IS_PURE_FP (b));
53 MPFR_ASSERTD (MPFR_IS_PURE_FP (c));
55 /* Now that we know that b and c are pure FP numbers (i.e. they have
56 a meaningful exponent), we use MPFR_EXP instead of MPFR_GET_EXP to
57 allow exponents outside the current exponent range. For instance,
58 this is useful for mpfr_pow, which compares values to __gmpfr_one.
59 This is for internal use only! For compatibility with other MPFR
60 versions, the user must still provide values that are representable
61 in the current exponent range. */
69 /* exponents are equal */
71 bn = MPFR_LIMB_SIZE(b)-1;
72 cn = MPFR_LIMB_SIZE(c)-1;
77 for ( ; bn >= 0 && cn >= 0; bn--, cn--)
85 for ( ; bn >= 0; bn--)
89 for ( ; cn >= 0; cn--)