sysdeps/x86_64/fpu/feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions.
   2    Copyright (C) 1997,99,2000,01,07,2010,2011 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, 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
  23 int
  24 __feupdateenv (const fenv_t *envp)
  25 {
  26   fexcept_t temp;
  27   unsigned int xtemp;
  28
  29   /* Save current exceptions.  */
  30   __asm__ ("fnstsw %0\n\tstmxcsr %1" : "=m" (*&temp), "=m" (xtemp));
  31   temp = (temp | xtemp) & FE_ALL_EXCEPT;
  32
  33   /* Install new environment.  */
  34   fesetenv (envp);
  35
  36   /* Raise the saved exception.  Incidently for us the implementation
  37      defined format of the values in objects of type fexcept_t is the
  38      same as the ones specified using the FE_* constants.  */
  39   __feraiseexcept ((int) temp);
  40
  41   /* Success.  */
  42   return 0;
  43 }
  44
  45 #include <shlib-compat.h>
  46 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  47 strong_alias (__feupdateenv, __old_feupdateenv)
  48 compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
  49 #endif
  50
  51 libm_hidden_ver (__feupdateenv, feupdateenv)
  52 versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);