1  /* Install given floating-point environment.
       2     Copyright (C) 1998-2023 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 <fenv.h>
      20  #include <fpu_control.h>
      21  
      22  int
      23  __fesetenv (const fenv_t *envp)
      24  {
      25    fpu_control_t cw;
      26  
      27    /* Read first current state to flush fpu pipeline.  */
      28    _FPU_GETCW (cw);
      29  
      30    if (envp == FE_DFL_ENV)
      31      _FPU_SETCW (_FPU_DEFAULT);
      32    else if (envp == FE_NOMASK_ENV)
      33      _FPU_SETCW (_FPU_IEEE);
      34    else
      35      _FPU_SETCW (envp->__fp_control_register);
      36  
      37    /* Success.  */
      38    return 0;
      39  }
      40  
      41  libm_hidden_def (__fesetenv)
      42  weak_alias (__fesetenv, fesetenv)
      43  libm_hidden_weak (fesetenv)