1 /* mpfr_cmpabs -- compare the absolute values of two FP numbers
3 Copyright 1999, 2001-2004, 2006-2015 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
--)