| /* Install given floating-point control modes. ARM version. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <fenv.h> |
| #include <fpu_control.h> |
| #include <arm-features.h> |
| |
| /* NZCV flags, QC bit, IDC bit and bits for IEEE exception status. */ |
| #define FPU_STATUS_BITS 0xf800009f |
| |
| int |
| fesetmode (const femode_t *modep) |
| { |
| fpu_control_t fpscr, new_fpscr; |
| |
| if (!ARM_HAVE_VFP) |
| /* Nothing to do. */ |
| return 0; |
| |
| _FPU_GETCW (fpscr); |
| if (modep == FE_DFL_MODE) |
| new_fpscr = (fpscr & (_FPU_RESERVED | FPU_STATUS_BITS)) | _FPU_DEFAULT; |
| else |
| new_fpscr = (fpscr & FPU_STATUS_BITS) | (*modep & ~FPU_STATUS_BITS); |
| |
| if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0) |
| _FPU_SETCW (new_fpscr); |
| |
| return 0; |
| } |
