sysdeps/am33/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Alexandre Oliva <aoliva@redhat.com>
   5    based on corresponding file in the MIPS port.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <fenv.h>
  23 #include <fenv_libc.h>
  24 #include <fpu_control.h>
  25 #include <shlib-compat.h>
  26
  27 int
  28 __feclearexcept (int excepts)
  29 {
  30   fpu_control_t cw;
  31
  32   /* Mask out unsupported bits/exceptions.  */
  33   excepts &= FE_ALL_EXCEPT;
  34
  35   /* Read the complete control word.  */
  36   _FPU_GETCW (cw);
  37
  38   /* Clear exception flag bits and cause bits.  EF bits are cleared by
  39      assigning 1 to them (and there's no way to set them); other bits
  40      are copied normally.  */
  41
  42   cw &= ~((excepts << CAUSE_SHIFT) | FE_ALL_EXCEPT);
  43   cw |= excepts;
  44
  45   /* Put the new data in effect.  */
  46   _FPU_SETFCW (cw);
  47
  48   /* Success.  */
  49   return 0;
  50 }
  51
  52 versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);