sysdeps/ia64/fpu/feenablxcpt.c

   1 /* Enable floating-point exceptions.
   2    Copyright (C) 2000-2022 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 feenableexcept (int excepts)
  23 {
  24   fenv_t old_fpsr;
  25   fenv_t new_fpsr;
  26
  27   /* Get the current fpsr.  */
  28   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (old_fpsr));
  29
  30   new_fpsr = old_fpsr & ~((fenv_t) excepts & FE_ALL_EXCEPT);
  31
  32   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (new_fpsr) : "memory");
  33
  34   return (old_fpsr ^ FE_ALL_EXCEPT) & FE_ALL_EXCEPT;
  35 }