1  /* Install given floating-point control modes.  Alpha version.
       2     Copyright (C) 2016-2023 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_libc.h>
      20  
      21  int
      22  fesetmode (const femode_t *modep)
      23  {
      24    unsigned long int fpcr;
      25    unsigned long int swcr;
      26    femode_t mode;
      27  
      28    /* As in fesetenv.  */
      29    if ((long int) modep >= 0)
      30      mode = *modep;
      31    else
      32      mode = (unsigned long int) modep;
      33  
      34    __asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr));
      35    fpcr = (fpcr & ~FPCR_ROUND_MASK) | (mode & FPCR_ROUND_MASK);
      36    __asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr));
      37  
      38    swcr = __ieee_get_fp_control ();
      39    swcr = ((mode & SWCR_ALL_MASK & ~SWCR_STATUS_MASK)
      40  	  | (swcr & SWCR_STATUS_MASK));
      41    __ieee_set_fp_control (swcr);
      42  
      43    return 0;
      44  }