1 /* Set the FPU control word. 2 Copyright (C) 1996-2022 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 <math.h> 20 #include <fpu_control.h> 21 #include <arm-features.h> 22 23 24 void __setfpucw(fpu_control_t set)25__setfpucw (fpu_control_t set) 26 { 27 fpu_control_t fpscr, new_fpscr; 28 29 /* Do nothing if a VFP unit isn't present. */ 30 if (!ARM_HAVE_VFP) 31 return; 32 33 _FPU_GETCW (fpscr); 34 35 /* Preserve the reserved bits, and set the rest as the user 36 specified (or the default, if the user gave zero). */ 37 new_fpscr = fpscr & _FPU_RESERVED; 38 new_fpscr |= set & ~_FPU_RESERVED; 39 40 /* Write FPSCR if changed. */ 41 if (new_fpscr != fpscr) 42 _FPU_SETCW (fpscr); 43 } 44