1  /* Install given floating-point environment.
       2     Copyright (C) 2018-2023 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    unsigned int fpcr;
      26    unsigned int fpsr;
      27  
      28    _FPU_GETCW (fpcr);
      29    _FPU_GETFPSR (fpsr);
      30  
      31    fpcr &= _FPU_RESERVED;
      32    fpsr &= _FPU_FPSR_RESERVED;
      33  
      34    if (envp == FE_DFL_ENV)
      35      {
      36        fpcr |= _FPU_DEFAULT;
      37        fpsr |= _FPU_FPSR_DEFAULT;
      38      }
      39    else if (envp == FE_NOMASK_ENV)
      40      {
      41        fpcr |= _FPU_FPCR_IEEE;
      42        fpsr |= _FPU_FPSR_IEEE;
      43      }
      44    else
      45      {
      46        fpcr |= envp->__fpcr & ~_FPU_RESERVED;
      47        fpsr |= envp->__fpsr & ~_FPU_FPSR_RESERVED;
      48      }
      49  
      50    _FPU_SETFPSR (fpsr);
      51  
      52    _FPU_SETCW (fpcr);
      53  
      54    /* Success.  */
      55    return 0;
      56  }
      57  libm_hidden_def (__fesetenv)
      58  weak_alias (__fesetenv, fesetenv)
      59  libm_hidden_weak (fesetenv)