sysdeps/s390/fpu/fsetexcptflg.c

   1 /* Set floating-point environment exception handling.
   2    Copyright (C) 2000 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv_libc.h>
  22 #include <math.h>
  23 #include <fpu_control.h>
  24
  25 int
  26 fesetexceptflag (const fexcept_t *flagp, int excepts)
  27 {
  28   fexcept_t temp,newexcepts;
  29
  30   /* Get the current environment.  We have to do this since we cannot
  31      separately set the status word.  */
  32   _FPU_GETCW (temp);
  33   /* Install the new exception bits in the Accrued Exception Byte.  */
  34   excepts = excepts & FE_ALL_EXCEPT;
  35   newexcepts = (excepts << FPC_DXC_SHIFT) | (excepts << FPC_FLAGS_SHIFT);
  36   temp &= ~newexcepts;
  37   temp |= *flagp & newexcepts;
  38
  39   /* Store the new status word (along with the rest of the environment.
  40      Possibly new exceptions are set but they won't get executed unless
  41      the next floating-point instruction.  */
  42   _FPU_SETCW (temp);
  43
  44   /* Success.  */
  45   return 0;
  46 }