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