1  /* Install given floating-point environment and raise exceptions.
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <fenv.h>
      20  
      21  int
      22  __feupdateenv (const fenv_t *envp)
      23  {
      24    fexcept_t temp;
      25    unsigned int xtemp;
      26  
      27    /* Save current exceptions.  */
      28    __asm__ ("fnstsw %0\n\tstmxcsr %1" : "=m" (*&temp), "=m" (xtemp));
      29    temp = (temp | xtemp) & FE_ALL_EXCEPT;
      30  
      31    /* Install new environment.  */
      32    __fesetenv (envp);
      33  
      34    /* Raise the saved exception.  Incidentally for us the implementation
      35       defined format of the values in objects of type fexcept_t is the
      36       same as the ones specified using the FE_* constants.  */
      37    __feraiseexcept ((int) temp);
      38  
      39    /* Success.  */
      40    return 0;
      41  }
      42  
      43  #include <shlib-compat.h>
      44  #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
      45  strong_alias (__feupdateenv, __old_feupdateenv)
      46  compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1);
      47  #endif
      48  
      49  libm_hidden_def (__feupdateenv)
      50  libm_hidden_ver (__feupdateenv, feupdateenv)
      51  versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2);