1 /* custom interface -- initialize a floating-point number with given
2 allocation area
3
4 Copyright 2005-2023 Free Software Foundation, Inc.
5 Contributed by the AriC and Caramba projects, INRIA.
6
7 This file is part of the GNU MPFR Library.
8
9 The GNU MPFR Library is free software; you can redistribute it and/or modify
10 it under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or (at your
12 option) any later version.
13
14 The GNU MPFR Library is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17 License for more details.
18
19 You should have received a copy of the GNU Lesser General Public License
20 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
21 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
22 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
23
24 #include "mpfr-impl.h"
25
26 #undef mpfr_custom_get_size
27 size_t
mpfr_custom_get_size(mpfr_prec_t prec)28 mpfr_custom_get_size (mpfr_prec_t prec)
29 {
30 return MPFR_PREC2LIMBS (prec) * MPFR_BYTES_PER_MP_LIMB;
31 }
32
33 #undef mpfr_custom_init
34 void
mpfr_custom_init(void * mantissa,mpfr_prec_t prec)35 mpfr_custom_init (void *mantissa, mpfr_prec_t prec)
36 {
37 return ;
38 }
39
40 #undef mpfr_custom_get_significand
41 void *
mpfr_custom_get_significand(mpfr_srcptr x)42 mpfr_custom_get_significand (mpfr_srcptr x)
43 {
44 return (void*) MPFR_MANT (x);
45 }
46
47 #undef mpfr_custom_get_exp
48 mpfr_exp_t
mpfr_custom_get_exp(mpfr_srcptr x)49 mpfr_custom_get_exp (mpfr_srcptr x)
50 {
51 return MPFR_EXP (x);
52 }
53
54 #undef mpfr_custom_move
55 void
mpfr_custom_move(mpfr_ptr x,void * new_position)56 mpfr_custom_move (mpfr_ptr x, void *new_position)
57 {
58 MPFR_MANT (x) = (mp_limb_t *) new_position;
59 }
60
61 #undef mpfr_custom_init_set
62 void
mpfr_custom_init_set(mpfr_ptr x,int kind,mpfr_exp_t exp,mpfr_prec_t prec,void * mantissa)63 mpfr_custom_init_set (mpfr_ptr x, int kind, mpfr_exp_t exp,
64 mpfr_prec_t prec, void *mantissa)
65 {
66 mpfr_kind_t t;
67 int s;
68 mpfr_exp_t e;
69
70 if (kind >= 0)
71 {
72 t = (mpfr_kind_t) kind;
73 s = MPFR_SIGN_POS;
74 }
75 else
76 {
77 t = (mpfr_kind_t) -kind;
78 s = MPFR_SIGN_NEG;
79 }
80 MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
81 e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
82 MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
83 MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;
84
85 MPFR_PREC (x) = prec;
86 MPFR_SET_SIGN (x, s);
87 MPFR_EXP (x) = e;
88 MPFR_MANT (x) = (mp_limb_t*) mantissa;
89 return;
90 }
91
92 #undef mpfr_custom_get_kind
93 int
mpfr_custom_get_kind(mpfr_srcptr x)94 mpfr_custom_get_kind (mpfr_srcptr x)
95 {
96 if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
97 return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
98 if (MPFR_IS_INF (x))
99 return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
100 if (MPFR_IS_NAN (x))
101 return (int) MPFR_NAN_KIND;
102 MPFR_ASSERTD (MPFR_IS_ZERO (x));
103 return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
104 }
105
106