1 /* Set current rounding direction. 2 Copyright (C) 1997-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <fenv_libc.h> 20 21 int __fesetround(int round)22__fesetround (int round) 23 { 24 unsigned long fpcr; 25 26 if (round & ~3) 27 return 1; 28 29 /* Get the current state. */ 30 __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(fpcr)); 31 32 /* Set the relevant bits. */ 33 fpcr = ((fpcr & ~FPCR_ROUND_MASK) 34 | ((unsigned long)round << FPCR_ROUND_SHIFT)); 35 36 /* Put the new state in effect. */ 37 __asm__ __volatile__("mt_fpcr %0; excb" : : "f"(fpcr)); 38 39 return 0; 40 } 41 libm_hidden_def (__fesetround) 42 weak_alias (__fesetround, fesetround) 43 libm_hidden_weak (fesetround) 44