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author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/realmpfr.c | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/realmpfr.c')
-rw-r--r-- | gcc-4.9/gcc/realmpfr.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/realmpfr.c b/gcc-4.9/gcc/realmpfr.c new file mode 100644 index 000000000..1f529647d --- /dev/null +++ b/gcc-4.9/gcc/realmpfr.c @@ -0,0 +1,102 @@ +/* Conversion routines from GCC internal float representation to MPFR. + Copyright (C) 2010-2014 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 "realmpfr.h" +#include "tree.h" /* For TYPE_MODE in real_from_mpfr. */ +#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 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); +} + |