1  /* Test exception in current environment.
       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  #include <unistd.h>
      21  #include <dl-procinfo.h>
      22  #include <ldsodefs.h>
      23  
      24  int
      25  fetestexcept (int excepts)
      26  {
      27    short temp;
      28    int xtemp = 0;
      29  
      30    /* Get current exceptions.  */
      31    __asm__ ("fnstsw %0" : "=a" (temp));
      32  
      33    /* If the CPU supports SSE we test the MXCSR as well.  */
      34    if (CPU_FEATURE_USABLE (SSE))
      35      __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
      36  
      37    return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
      38  }
      39  libm_hidden_def (fetestexcept)