sysdeps/hppa/fpu/feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions.
   2    Copyright (C) 2000 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22 #include <string.h>
  23
  24 int
  25 feupdateenv (const fenv_t *envp)
  26 {
  27   union { unsigned long long l; unsigned int sw[2]; } s;
  28   fenv_t temp;
  29   /* Get the current exception status */
  30   __asm__ ("fstd %%fr0,0(%1)    \n\t"
  31            "fldd 0(%1),%%fr0    \n\t"
  32            : "=m" (s.l) : "r" (&s.l));
  33   memcpy(&temp, envp, sizeof(fenv_t));
  34   /* Currently raised exceptions not cleared */
  35   temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27);
  36   /* Install new environment.  */
  37   fesetenv (&temp);
  38   /* Success.  */
  39   return 0;
  40 }