1 /* mpfr_add_si -- add a floating-point number with a machine integer 2 mpfr_sub_si -- sub a floating-point number with a machine integer 3 mpfr_si_sub -- sub a machine number with a floating-point number 4 5 Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. 6 Contributed by the AriC and Caramel projects, INRIA. 7 8 This file is part of the GNU MPFR Library. 9 10 The GNU MPFR Library is free software; you can redistribute it and/or modify 11 it under the terms of the GNU Lesser General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or (at your 13 option) any later version. 14 15 The GNU MPFR Library is distributed in the hope that it will be useful, but 16 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 17 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 18 License for more details. 19 20 You should have received a copy of the GNU Lesser General Public License 21 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 22 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 23 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 24 25 #include "mpfr-impl.h" 26 27 int 28 mpfr_add_si (mpfr_ptr y, mpfr_srcptr x, long int u, mpfr_rnd_t rnd_mode) 29 { 30 if (u >= 0) 31 return mpfr_add_ui (y, x, u, rnd_mode); 32 else 33 return mpfr_sub_ui (y, x, -u, rnd_mode); 34 } 35 36 int 37 mpfr_sub_si (mpfr_ptr y, mpfr_srcptr x, long int u, mpfr_rnd_t rnd_mode) 38 { 39 if (u >= 0) 40 return mpfr_sub_ui (y, x, u, rnd_mode); 41 else 42 return mpfr_add_ui (y, x, -u, rnd_mode); 43 } 44 45 int 46 mpfr_si_sub (mpfr_ptr y, long int u, mpfr_srcptr x, mpfr_rnd_t rnd_mode) 47 { 48 if (u >= 0) 49 return mpfr_ui_sub (y, u, x, rnd_mode); 50 else 51 { 52 int res = -mpfr_add_ui (y, x, -u, MPFR_INVERT_RND (rnd_mode)); 53 MPFR_CHANGE_SIGN (y); 54 return res; 55 } 56 } 57 58