1/* mpfr_frexp -- convert to integral and fractional parts 2 3Copyright 2011, 2012, 2013 Free Software Foundation, Inc. 4Contributed by the AriC and Caramel projects, INRIA. 5 6This file is part of the GNU MPFR Library. 7 8The GNU MPFR Library is free software; you can redistribute it and/or modify 9it under the terms of the GNU Lesser General Public License as published by 10the Free Software Foundation; either version 3 of the License, or (at your 11option) any later version. 12 13The GNU MPFR Library is distributed in the hope that it will be useful, but 14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16License for more details. 17 18You should have received a copy of the GNU Lesser General Public License 19along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23#include "mpfr-impl.h" 24 25int 26mpfr_frexp (mpfr_exp_t *exp, mpfr_ptr y, mpfr_srcptr x, mpfr_rnd_t rnd) 27{ 28 int inex; 29 30 if (MPFR_UNLIKELY(MPFR_IS_SINGULAR(x))) 31 { 32 if (MPFR_IS_NAN(x)) 33 { 34 MPFR_SET_NAN(y); 35 MPFR_RET_NAN; /* exp is unspecified */ 36 } 37 else if (MPFR_IS_INF(x)) 38 { 39 MPFR_SET_INF(y); 40 MPFR_SET_SAME_SIGN(y,x); 41 MPFR_RET(0); /* exp is unspecified */ 42 } 43 else 44 { 45 MPFR_SET_ZERO(y); 46 MPFR_SET_SAME_SIGN(y,x); 47 *exp = 0; 48 MPFR_RET(0); 49 } 50 } 51 52 inex = mpfr_set (y, x, rnd); 53 *exp = MPFR_GET_EXP (y); 54 MPFR_SET_EXP (y, 0); 55 return mpfr_check_range (y, inex, rnd); 56} 57