| /* Conversion routines from GCC internal float representation to MPFR. |
| Copyright (C) 2010-2017 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tree.h" |
| #include "realmpfr.h" |
| #include "stor-layout.h" |
| |
| /* Convert from REAL_VALUE_TYPE to MPFR. The caller is responsible |
| for initializing and clearing the MPFR parameter. */ |
| |
| void |
| mpfr_from_real (mpfr_ptr m, const REAL_VALUE_TYPE *r, mp_rnd_t rndmode) |
| { |
| /* We use a string as an intermediate type. */ |
| char buf[128]; |
| int ret; |
| |
| /* Take care of Infinity and NaN. */ |
| if (r->cl == rvc_inf) |
| { |
| mpfr_set_inf (m, r->sign == 1 ? -1 : 1); |
| return; |
| } |
| |
| if (r->cl == rvc_nan) |
| { |
| mpfr_set_nan (m); |
| return; |
| } |
| |
| real_to_hexadecimal (buf, r, sizeof (buf), 0, 1); |
| /* mpfr_set_str() parses hexadecimal floats from strings in the same |
| format that GCC will output them. Nothing extra is needed. */ |
| ret = mpfr_set_str (m, buf, 16, rndmode); |
| gcc_assert (ret == 0); |
| } |
| |
| /* Convert from MPFR to REAL_VALUE_TYPE, for a given format FORMAT and |
| rounding mode RNDMODE. FORMAT is only relevant if M is a NaN. */ |
| |
| void |
| real_from_mpfr (REAL_VALUE_TYPE *r, mpfr_srcptr m, const real_format *format, |
| mp_rnd_t rndmode) |
| { |
| /* We use a string as an intermediate type. */ |
| char buf[128], *rstr; |
| mp_exp_t exp; |
| |
| /* Take care of Infinity and NaN. */ |
| if (mpfr_inf_p (m)) |
| { |
| real_inf (r); |
| if (mpfr_sgn (m) < 0) |
| *r = real_value_negate (r); |
| return; |
| } |
| |
| if (mpfr_nan_p (m)) |
| { |
| real_nan (r, "", 1, format); |
| return; |
| } |
| |
| rstr = mpfr_get_str (NULL, &exp, 16, 0, m, rndmode); |
| |
| /* The additional 12 chars add space for the sprintf below. This |
| leaves 6 digits for the exponent which is supposedly enough. */ |
| gcc_assert (rstr != NULL && strlen (rstr) < sizeof (buf) - 12); |
| |
| /* REAL_VALUE_ATOF expects the exponent for mantissa * 2**exp, |
| mpfr_get_str returns the exponent for mantissa * 16**exp, adjust |
| for that. */ |
| exp *= 4; |
| |
| if (rstr[0] == '-') |
| sprintf (buf, "-0x.%sp%d", &rstr[1], (int) exp); |
| else |
| sprintf (buf, "0x.%sp%d", rstr, (int) exp); |
| |
| mpfr_free_str (rstr); |
| |
| real_from_string (r, buf); |
| } |
| |
| /* Convert from MPFR to REAL_VALUE_TYPE, for a given type TYPE and rounding |
| mode RNDMODE. TYPE is only relevant if M is a NaN. */ |
| |
| void |
| real_from_mpfr (REAL_VALUE_TYPE *r, mpfr_srcptr m, tree type, mp_rnd_t rndmode) |
| { |
| real_from_mpfr (r, m, type ? REAL_MODE_FORMAT (TYPE_MODE (type)) : NULL, |
| rndmode); |
| } |
| |