1  /* Clear given exceptions in current floating-point 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  
      21  int
      22  __feclearexcept (int excepts)
      23  {
      24    fexcept_t fpsr;
      25  
      26    /* Mask out unsupported bits/exceptions.  */
      27    excepts &= FE_ALL_EXCEPT;
      28  
      29    /* Fetch the fpu status register.  */
      30    __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
      31  
      32    /* Clear the relevant bits.  */
      33    fpsr &= ~excepts;
      34  
      35    /* Put the new data in effect.  */
      36    __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
      37  
      38    /* Success.  */
      39    return 0;
      40  }
      41  
      42  #include <shlib-compat.h>
      43  #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
      44  strong_alias (__feclearexcept, __old_feclearexcept)
      45  compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
      46  #endif
      47  
      48  libm_hidden_ver (__feclearexcept, feclearexcept)
      49  versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);