1 /* mpf_cmp_d -- compare mpf and double.
2
3 Copyright 2001, 2003 Free Software Foundation, Inc.
4
5 This file is part of the GNU MP Library.
6
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 License for more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
19
20 #include "config.h"
21
22 #if HAVE_FLOAT_H
23 #include <float.h> /* for DBL_MAX */
24 #endif
25
26 #include "gmp.h"
27 #include "gmp-impl.h"
28
29 int
mpf_cmp_d(mpf_srcptr f,double d)30 mpf_cmp_d (mpf_srcptr f, double d)
31 {
32 mp_limb_t darray[LIMBS_PER_DOUBLE];
33 mpf_t df;
34
35 /* d=NaN has no sensible return value, so raise an exception.
36 d=Inf or -Inf is always bigger than z. */
37 DOUBLE_NAN_INF_ACTION (d,
38 __gmp_invalid_operation (),
39 return (d < 0.0 ? 1 : -1));
40
41 if (d == 0.0)
42 return SIZ(f);
43
44 PTR(df) = darray;
45 SIZ(df) = (d >= 0.0 ? LIMBS_PER_DOUBLE : -LIMBS_PER_DOUBLE);
46 EXP(df) = __gmp_extract_double (darray, ABS(d));
47
48 return mpf_cmp (f, df);
49 }
50