ports/sysdeps/hppa/fpu/feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions.
   2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by David Huggins-Daines <dhd@debian.org>, 2000
   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.h>
  21 #include <string.h>
  22
  23 int
  24 feupdateenv (const fenv_t *envp)
  25 {
  26   union { unsigned long long l; unsigned int sw[2]; } s;
  27   fenv_t temp;
  28   /* Get the current exception status */
  29   __asm__ ("fstd %%fr0,0(%1)    \n\t"
  30            "fldd 0(%1),%%fr0    \n\t"
  31            : "=m" (s.l) : "r" (&s.l));
  32   memcpy(&temp, envp, sizeof(fenv_t));
  33   /* Currently raised exceptions not cleared */
  34   temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27);
  35   /* Install new environment.  */
  36   fesetenv (&temp);
  37   /* Success.  */
  38   return 0;
  39 }
  40 libm_hidden_def (feupdateenv)