1  /* Install given floating-point environment and raise exceptions,
       2     without clearing currently raised exceptions.
       3     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library.  If not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <fenv.h>
      21  #include <fpu_control.h>
      22  
      23  int
      24  __feupdateenv (const fenv_t *envp)
      25  {
      26    unsigned int fpcr;
      27    unsigned int fpsr;
      28  
      29    _FPU_GETS (fpsr);
      30  
      31    if (envp == FE_DFL_ENV)
      32      {
      33        fpcr = _FPU_DEFAULT;
      34      }
      35    else
      36      {
      37        fpcr = envp->__fpcr;
      38  
      39        /* currently raised exceptions need to be preserved.  */
      40        fpsr |= envp->__fpsr;
      41      }
      42  
      43    _FPU_SETCW (fpcr);
      44    _FPU_SETS (fpsr);
      45  
      46    /* Success.  */
      47    return 0;
      48  }
      49  libm_hidden_def (__feupdateenv)
      50  weak_alias (__feupdateenv, feupdateenv)
      51  libm_hidden_weak (feupdateenv)