1  /* Install given floating-point control modes.
       2     Copyright (C) 2022-2023 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  #define FCSR_STATUS 0x1f1f0000
      23  
      24  int
      25  fesetmode (const femode_t *modep)
      26  {
      27    fpu_control_t cw;
      28  
      29    _FPU_GETCW (cw);
      30    cw &= FCSR_STATUS;
      31    if (modep == FE_DFL_MODE)
      32      cw |= _FPU_DEFAULT;
      33    else
      34      cw |= *modep & ~FCSR_STATUS;
      35    _FPU_SETCW (cw);
      36  
      37    return 0;
      38  }