| /* Copyright (C) 1997-2018 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> |
| |
| int |
| __fesetenv (const fenv_t *envp) |
| { |
| fpu_control_t fpcr; |
| fpu_control_t fpcr_new; |
| fpu_control_t updated_fpcr; |
| fpu_fpsr_t fpsr; |
| fpu_fpsr_t fpsr_new; |
| |
| _FPU_GETCW (fpcr); |
| |
| if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) |
| { |
| /* The new FPCR/FPSR are valid, so don't merge the reserved flags. */ |
| fpcr_new = envp->__fpcr; |
| |
| if (fpcr != fpcr_new) |
| _FPU_SETCW (fpcr_new); |
| |
| _FPU_SETFPSR (envp->__fpsr); |
| return 0; |
| } |
| |
| _FPU_GETFPSR (fpsr); |
| fpcr_new = fpcr & _FPU_RESERVED; |
| fpsr_new = fpsr & _FPU_FPSR_RESERVED; |
| |
| if (envp == FE_DFL_ENV) |
| { |
| fpcr_new |= _FPU_DEFAULT; |
| fpsr_new |= _FPU_FPSR_DEFAULT; |
| } |
| else |
| { |
| fpcr_new |= _FPU_FPCR_IEEE; |
| fpsr_new |= _FPU_FPSR_IEEE; |
| } |
| |
| _FPU_SETFPSR (fpsr_new); |
| |
| if (fpcr != fpcr_new) |
| { |
| _FPU_SETCW (fpcr_new); |
| |
| /* Trapping exceptions are optional in AArch64; the relevant enable |
| bits in FPCR are RES0 hence the absence of support can be detected |
| by reading back the FPCR and comparing with the required value. */ |
| _FPU_GETCW (updated_fpcr); |
| |
| return fpcr_new & ~updated_fpcr; |
| } |
| |
| return 0; |
| } |
| libm_hidden_def (__fesetenv) |
| weak_alias (__fesetenv, fesetenv) |
| libm_hidden_weak (fesetenv) |
