sysdeps/s390/fpu/fsetexcptflg.c

   1 /* Set floating-point environment exception handling.
   2    Copyright (C) 2000-2015 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 <math.h>
  22 #include <fpu_control.h>
  23
  24 int
  25 fesetexceptflag (const fexcept_t *flagp, int excepts)
  26 {
  27   fexcept_t temp,newexcepts;
  28
  29   /* Get the current environment.  We have to do this since we cannot
  30      separately set the status word.  */
  31   _FPU_GETCW (temp);
  32   /* Install the new exception bits in the Accrued Exception Byte.  */
  33   excepts = excepts & FE_ALL_EXCEPT;
  34   newexcepts = (excepts << FPC_DXC_SHIFT) | (excepts << FPC_FLAGS_SHIFT);
  35   temp &= ~newexcepts;
  36   temp |= *flagp & newexcepts;
  37
  38   /* Store the new status word (along with the rest of the environment.
  39      Possibly new exceptions are set but they won't get executed unless
  40      the next floating-point instruction.  */
  41   _FPU_SETCW (temp);
  42
  43   /* Success.  */
  44   return 0;
  45 }