1 /* mpfr_copysign -- Produce a value with the magnitude of x and sign bit of y 2 3 Copyright 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. 4 Contributed by the AriC and Caramel projects, INRIA. 5 6 This file is part of the GNU MPFR Library. 7 8 The GNU MPFR Library is free software; you can redistribute it and/or modify 9 it under the terms of the GNU Lesser General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or (at your 11 option) any later version. 12 13 The GNU MPFR Library is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 License for more details. 17 18 You should have received a copy of the GNU Lesser General Public License 19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23 #include "mpfr-impl.h" 24 25 /* 26 The computation of z with magnitude of x and sign of y: 27 z = (-1)^signbit(y) * abs(x), i.e. with the same sign bit as y, 28 even if z is a NaN. 29 Note: This function implements copysign from the IEEE-754 standard 30 when no rounding occurs (e.g. if PREC(z) >= PREC(x)). 31 */ 32 33 #undef mpfr_copysign 34 int 35 mpfr_copysign (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode) 36 { 37 return mpfr_set4 (z, x, rnd_mode, MPFR_SIGN (y)); 38 } 39