1 /* Conversion routines from GCC internal float representation to MPFR.
4 This file is part of GCC.
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
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
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/>. */
22 #include "coretypes.h"
24 #include "tree.h" /* For TYPE_MODE in real_from_mpfr. */
26 /* Convert from REAL_VALUE_TYPE to MPFR. The caller is responsible
27 for initializing and clearing the MPFR parameter. */
30 mpfr_from_real (mpfr_ptr m, const REAL_VALUE_TYPE *r, mp_rnd_t rndmode)
32 /* We use a string as an intermediate type. */
36 /* Take care of Infinity and NaN. */
39 mpfr_set_inf (m, r->sign == 1 ? -1 : 1);
49 real_to_hexadecimal (buf, r, sizeof (buf), 0, 1);
50 /* mpfr_set_str() parses hexadecimal floats from strings in the same
51 format that GCC will output them. Nothing extra is needed. */
52 ret = mpfr_set_str (m, buf, 16, rndmode);
53 gcc_assert (ret == 0);
56 /* Convert from MPFR to REAL_VALUE_TYPE, for a given type TYPE and rounding
57 mode RNDMODE. TYPE is only relevant if M is a NaN. */
60 real_from_mpfr (REAL_VALUE_TYPE *r, mpfr_srcptr m, tree type, mp_rnd_t rndmode)
62 /* We use a string as an intermediate type. */
66 /* Take care of Infinity and NaN. */
71 *r = real_value_negate (r);
77 real_nan (r, "", 1, TYPE_MODE (type));
81 rstr = mpfr_get_str (NULL, &exp, 16, 0, m, rndmode);
83 /* The additional 12 chars add space for the sprintf below. This
84 leaves 6 digits for the exponent which is supposedly enough. */
85 gcc_assert (rstr != NULL && strlen (rstr) < sizeof (buf) - 12);
87 /* REAL_VALUE_ATOF expects the exponent for mantissa * 2**exp,
88 mpfr_get_str returns the exponent for mantissa * 16**exp, adjust
93 sprintf (buf, "-0x.%sp%d", &rstr[1], (int) exp);
95 sprintf (buf, "0x.%sp%d", rstr, (int) exp);
99 real_from_string (r, buf);