1 /* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats 2 3 Copyright 1999, 2001-2002, 2006-2023 Free Software Foundation, Inc. 4 Contributed by the AriC and Caramba 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 https://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-test.h" 24 25 /* It is important to test each FE_* macro -- see the ISO C99 standard. 26 For instance, with some ARM implementations, only FE_TONEAREST may 27 be defined. */ 28 29 /* sets the machine rounding mode to the value rnd_mode */ 30 int 31 mpfr_set_machine_rnd_mode (mpfr_rnd_t rnd_mode) 32 { 33 switch (rnd_mode) 34 { 35 case MPFR_RNDN: 36 return 37 #if defined (MPFR_HAVE_FESETROUND) && defined (FE_TONEAREST) 38 fesetround(FE_TONEAREST) 39 #else 40 -1 41 #endif 42 ; 43 case MPFR_RNDZ: 44 return 45 #if defined (MPFR_HAVE_FESETROUND) && defined (FE_TOWARDZERO) 46 fesetround(FE_TOWARDZERO) 47 #else 48 -1 49 #endif 50 ; 51 case MPFR_RNDU: 52 return 53 #if defined (MPFR_HAVE_FESETROUND) && defined (FE_UPWARD) 54 fesetround(FE_UPWARD) 55 #else 56 -1 57 #endif 58 ; 59 case MPFR_RNDD: 60 return 61 #if defined (MPFR_HAVE_FESETROUND) && defined (FE_DOWNWARD) 62 fesetround(FE_DOWNWARD) 63 #else 64 -1 65 #endif 66 ; 67 default: 68 return -1; 69 } 70 } 71