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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [realmpfr.c] - Rev 758
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/* Conversion routines from GCC internal float representation to MPFR. Copyright (C) 2010 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 "realmpfr.h" #include "tree.h" /* For TYPE_MODE in real_from_mpfr. */ /* 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 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) { /* 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, TYPE_MODE (type)); 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); }
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