sysdeps/x86_64/fpu/feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   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
  22 int
  23 __feupdateenv (const fenv_t *envp)
  24 {
  25   fexcept_t temp;
  26   unsigned int xtemp;
  27
  28   /* Save current exceptions.  */
  29   __asm__ ("fnstsw %0\n\tstmxcsr %1" : "=m" (*&temp), "=m" (xtemp));
  30   temp = (temp | xtemp) & FE_ALL_EXCEPT;
  31
  32   /* Install new environment.  */
  33   fesetenv (envp);
  34
  35   /* Raise the saved exception.  Incidently for us the implementation
  36      defined format of the values in objects of type fexcept_t is the
  37      same as the ones specified using the FE_* constants.  */
  38   __feraiseexcept ((int) temp);
  39
  40   /* Success.  */
  41   return 0;
  42 }
  43
  44 #include <shlib-compat.h>
  45 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  46 strong_alias (__feupdateenv, __old_feupdateenv)
  47 compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
  48 #endif
  49
  50 libm_hidden_ver (__feupdateenv, feupdateenv)
  51 versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);