sysdeps/aarch64/fpu/fesetenv.c

   1 /* Copyright (C) 1997-2014 Free Software Foundation, Inc.
   2
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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
  22 int
  23 fesetenv (const fenv_t *envp)
  24 {
  25   fpu_control_t fpcr;
  26   fpu_fpsr_t fpsr;
  27
  28   _FPU_GETCW (fpcr);
  29   _FPU_GETFPSR (fpsr);
  30
  31   fpcr &= _FPU_RESERVED;
  32   fpsr &= _FPU_FPSR_RESERVED;
  33
  34   if (envp == FE_DFL_ENV)
  35     {
  36       fpcr |= _FPU_DEFAULT;
  37       fpsr |= _FPU_FPSR_DEFAULT;
  38     }
  39   else if (envp == FE_NOMASK_ENV)
  40     {
  41       fpcr |= _FPU_FPCR_IEEE;
  42       fpsr |= _FPU_FPSR_IEEE;
  43     }
  44   else
  45     {
  46       fpcr |= envp->__fpcr & ~_FPU_RESERVED;
  47       fpsr |= envp->__fpsr & ~_FPU_FPSR_RESERVED;
  48     }
  49
  50   _FPU_SETFPSR (fpsr);
  51
  52   _FPU_SETCW (fpcr);
  53
  54   return 0;
  55 }
  56
  57 libm_hidden_def (fesetenv)