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glibc  2.9
feupdateenv.c
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00001 /* Install given floating-point environment and raise exceptions.
00002    Copyright (C) 1997,99,2000,01,07 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <fenv.h>
00022 
00023 int
00024 __feupdateenv (const fenv_t *envp)
00025 {
00026   fexcept_t temp;
00027   unsigned int xtemp;
00028 
00029   /* Save current exceptions.  */
00030   __asm__ ("fnstsw %0\n\tstmxcsr %1" : "=m" (*&temp), "=m" (xtemp));
00031   temp = (temp | xtemp) & FE_ALL_EXCEPT;
00032 
00033   /* Install new environment.  */
00034   fesetenv (envp);
00035 
00036   /* Raise the saved exception.  Incidently for us the implementation
00037      defined format of the values in objects of type fexcept_t is the
00038      same as the ones specified using the FE_* constants.  */
00039   feraiseexcept ((int) temp);
00040 
00041   /* Success.  */
00042   return 0;
00043 }
00044 
00045 #include <shlib-compat.h>
00046 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
00047 strong_alias (__feupdateenv, __old_feupdateenv)
00048 compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
00049 #endif
00050 
00051 versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);