| /* Install given floating-point environment. |
| Copyright (C) 2004-2018 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> |
| |
| |
| int |
| __fesetenv (const fenv_t *envp) |
| { |
| fpu_control_t fpscr, new_fpscr, updated_fpscr; |
| |
| /* Fail if a VFP unit isn't present. */ |
| if (!ARM_HAVE_VFP) |
| return 1; |
| |
| _FPU_GETCW (fpscr); |
| |
| if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
| { |
| /* The new FPSCR is valid, so don't merge the reserved flags. */ |
| new_fpscr = envp->__cw; |
| |
| /* Write new FPSCR if different (ignoring NZCV flags). */ |
| if (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0) |
| _FPU_SETCW (new_fpscr); |
| |
| return 0; |
| } |
| |
| /* Preserve the reserved FPSCR flags. */ |
| new_fpscr = fpscr & _FPU_RESERVED; |
| new_fpscr |= (envp == FE_DFL_ENV) ? _FPU_DEFAULT : _FPU_IEEE; |
| |
| if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0) |
| { |
| _FPU_SETCW (new_fpscr); |
| |
| /* Not all VFP architectures support trapping exceptions, so |
| test whether the relevant bits were set and fail if not. */ |
| _FPU_GETCW (updated_fpscr); |
| |
| return new_fpscr & ~updated_fpscr; |
| } |
| |
| return 0; |
| } |
| libm_hidden_def (__fesetenv) |
| weak_alias (__fesetenv, fesetenv) |
| libm_hidden_weak (fesetenv) |
