sysdeps/s390/fpu/fesetmode.c

   1 /* Install given floating-point control modes.  S/390 version.
   2    Copyright (C) 2016-2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20 #include <fpu_control.h>
  21 #include <fenv_libc.h>
  22
  23 #define FPC_STATUS (FPC_FLAGS_MASK | FPC_DXC_MASK)
  24
  25 int
  26 fesetmode (const femode_t *modep)
  27 {
  28   fpu_control_t fpc;
  29
  30   _FPU_GETCW (fpc);
  31   fpc &= FPC_STATUS;
  32   if (modep == FE_DFL_MODE)
  33     fpc |= _FPU_DEFAULT;
  34   else
  35     fpc |= *modep & ~FPC_STATUS;
  36   _FPU_SETCW (fpc);
  37
  38   return 0;
  39 }