sysdeps/s390/fpu/ftestexcept.c

   1 /* Test exception in current environment.
   2    Copyright (C) 2000-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv_libc.h>
  21 #include <fpu_control.h>
  22
  23 int
  24 fetestexcept (int excepts)
  25 {
  26   fexcept_t temp, res;
  27
  28   /* Get current exceptions.  */
  29   _FPU_GETCW (temp);
  30   res = temp >> FPC_FLAGS_SHIFT;
  31   if ((temp & FPC_NOT_FPU_EXCEPTION) == 0)
  32     /* Bits 6, 7 of dxc-byte are zero,
  33        thus bits 0-5 of dxc-byte correspond to the flag-bits.
  34        Evaluate flags and last dxc-exception-code.  */
  35     res |= temp >> FPC_DXC_SHIFT;
  36
  37   return res & excepts & FE_ALL_EXCEPT;
  38 }
  39 libm_hidden_def (fetestexcept)