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d49b6e1e | 1 | /* Conversion routines from GCC internal float representation to MPFR. |
7adcbafe | 2 | Copyright (C) 2010-2022 Free Software Foundation, Inc. |
d49b6e1e SB |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
957060b5 | 23 | #include "tree.h" |
d49b6e1e | 24 | #include "realmpfr.h" |
d8a2d370 | 25 | #include "stor-layout.h" |
d49b6e1e SB |
26 | |
27 | /* Convert from REAL_VALUE_TYPE to MPFR. The caller is responsible | |
28 | for initializing and clearing the MPFR parameter. */ | |
29 | ||
30 | void | |
90ca6847 | 31 | mpfr_from_real (mpfr_ptr m, const REAL_VALUE_TYPE *r, mpfr_rnd_t rndmode) |
d49b6e1e SB |
32 | { |
33 | /* We use a string as an intermediate type. */ | |
34 | char buf[128]; | |
35 | int ret; | |
36 | ||
37 | /* Take care of Infinity and NaN. */ | |
38 | if (r->cl == rvc_inf) | |
39 | { | |
40 | mpfr_set_inf (m, r->sign == 1 ? -1 : 1); | |
41 | return; | |
42 | } | |
43 | ||
44 | if (r->cl == rvc_nan) | |
45 | { | |
46 | mpfr_set_nan (m); | |
47 | return; | |
48 | } | |
49 | ||
50 | real_to_hexadecimal (buf, r, sizeof (buf), 0, 1); | |
51 | /* mpfr_set_str() parses hexadecimal floats from strings in the same | |
52 | format that GCC will output them. Nothing extra is needed. */ | |
53 | ret = mpfr_set_str (m, buf, 16, rndmode); | |
54 | gcc_assert (ret == 0); | |
55 | } | |
56 | ||
5c1a2e63 RS |
57 | /* Convert from MPFR to REAL_VALUE_TYPE, for a given format FORMAT and |
58 | rounding mode RNDMODE. FORMAT is only relevant if M is a NaN. */ | |
d49b6e1e SB |
59 | |
60 | void | |
5c1a2e63 | 61 | real_from_mpfr (REAL_VALUE_TYPE *r, mpfr_srcptr m, const real_format *format, |
90ca6847 | 62 | mpfr_rnd_t rndmode) |
d49b6e1e SB |
63 | { |
64 | /* We use a string as an intermediate type. */ | |
65 | char buf[128], *rstr; | |
90ca6847 | 66 | mpfr_exp_t exp; |
d49b6e1e SB |
67 | |
68 | /* Take care of Infinity and NaN. */ | |
69 | if (mpfr_inf_p (m)) | |
70 | { | |
71 | real_inf (r); | |
72 | if (mpfr_sgn (m) < 0) | |
73 | *r = real_value_negate (r); | |
74 | return; | |
75 | } | |
76 | ||
77 | if (mpfr_nan_p (m)) | |
78 | { | |
5c1a2e63 | 79 | real_nan (r, "", 1, format); |
d49b6e1e SB |
80 | return; |
81 | } | |
82 | ||
83 | rstr = mpfr_get_str (NULL, &exp, 16, 0, m, rndmode); | |
84 | ||
85 | /* The additional 12 chars add space for the sprintf below. This | |
86 | leaves 6 digits for the exponent which is supposedly enough. */ | |
87 | gcc_assert (rstr != NULL && strlen (rstr) < sizeof (buf) - 12); | |
88 | ||
89 | /* REAL_VALUE_ATOF expects the exponent for mantissa * 2**exp, | |
90 | mpfr_get_str returns the exponent for mantissa * 16**exp, adjust | |
91 | for that. */ | |
92 | exp *= 4; | |
93 | ||
94 | if (rstr[0] == '-') | |
95 | sprintf (buf, "-0x.%sp%d", &rstr[1], (int) exp); | |
96 | else | |
97 | sprintf (buf, "0x.%sp%d", rstr, (int) exp); | |
98 | ||
99 | mpfr_free_str (rstr); | |
100 | ||
101 | real_from_string (r, buf); | |
102 | } | |
103 | ||
5c1a2e63 RS |
104 | /* Convert from MPFR to REAL_VALUE_TYPE, for a given type TYPE and rounding |
105 | mode RNDMODE. TYPE is only relevant if M is a NaN. */ | |
106 | ||
107 | void | |
90ca6847 TB |
108 | real_from_mpfr (REAL_VALUE_TYPE *r, mpfr_srcptr m, tree type, |
109 | mpfr_rnd_t rndmode) | |
5c1a2e63 RS |
110 | { |
111 | real_from_mpfr (r, m, type ? REAL_MODE_FORMAT (TYPE_MODE (type)) : NULL, | |
112 | rndmode); | |
113 | } | |
114 |