sysdeps/ia64/fpu/fsetexcptflg.c

   1 /* Set floating-point environment exception handling.
   2    Copyright (C) 1997-2021 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
  21 int
  22 fesetexceptflag (const fexcept_t *flagp, int excepts)
  23 {
  24   fenv_t fpsr;
  25
  26   /* Get the current exception state.  */
  27   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
  28
  29   fpsr &= ~(((fenv_t) excepts & FE_ALL_EXCEPT) << 13);
  30
  31   /* Set all the bits that were called for.  */
  32   fpsr |= ((*flagp & excepts & FE_ALL_EXCEPT) << 13);
  33
  34   /* And store it back.  */
  35   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr) : "memory");
  36
  37   /* Success.  */
  38   return 0;
  39 }