sysdeps/s390/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 2000-2019 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_libc.h>
  20 #include <fpu_control.h>
  21
  22 int
  23 feclearexcept (int excepts)
  24 {
  25   fexcept_t temp;
  26
  27   /* Mask out unsupported bits/exceptions.  */
  28   excepts &= FE_ALL_EXCEPT;
  29
  30   _FPU_GETCW (temp);
  31   /* Clear the relevant bits.  */
  32   temp &= ~(excepts << FPC_FLAGS_SHIFT);
  33   if ((temp & FPC_NOT_FPU_EXCEPTION) == 0)
  34     /* Bits 6, 7 of dxc-byte are zero,
  35        thus bits 0-5 of dxc-byte correspond to the flag-bits.
  36        Clear the relevant bits in flags and dxc-field.  */
  37     temp &= ~(excepts << FPC_DXC_SHIFT);
  38
  39   /* Put the new data in effect.  */
  40   _FPU_SETCW (temp);
  41
  42   /* Success.  */
  43   return 0;
  44 }
  45 libm_hidden_def (feclearexcept)