ports/sysdeps/m68k/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21
  22 int
  23 __feclearexcept (int excepts)
  24 {
  25   fexcept_t fpsr;
  26
  27   /* Mask out unsupported bits/exceptions.  */
  28   excepts &= FE_ALL_EXCEPT;
  29
  30   /* Fetch the fpu status register.  */
  31   __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr));
  32
  33   /* Clear the relevant bits.  */
  34   fpsr &= ~excepts;
  35
  36   /* Put the new data in effect.  */
  37   __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
  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 (__feclearexcept, __old_feclearexcept)
  46 compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
  47 #endif
  48
  49 libm_hidden_ver (__feclearexcept, feclearexcept)
  50 versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);