sysdeps/m68k/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1997-2024 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);