ports/sysdeps/arm/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1997-2012 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20 #include <fpu_control.h>
  21 #include <arm-features.h>
  22
  23
  24 int
  25 __feclearexcept (int excepts)
  26 {
  27   if (ARM_HAVE_VFP)
  28     {
  29       unsigned long int temp;
  30
  31       /* Mask out unsupported bits/exceptions.  */
  32       excepts &= FE_ALL_EXCEPT;
  33
  34       /* Get the current floating point status. */
  35       _FPU_GETCW (temp);
  36
  37       /* Clear the relevant bits.  */
  38       temp = (temp & ~FE_ALL_EXCEPT) | (temp & FE_ALL_EXCEPT & ~excepts);
  39
  40       /* Put the new data in effect.  */
  41       _FPU_SETCW (temp);
  42
  43       /* Success.  */
  44       return 0;
  45     }
  46
  47   /* Unsupported, so fail unless nothing needs to be done.  */
  48   return (excepts != 0);
  49 }
  50
  51 #include <shlib-compat.h>
  52 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  53 strong_alias (__feclearexcept, __old_feclearexcept)
  54 compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
  55 #endif
  56
  57 libm_hidden_ver (__feclearexcept, feclearexcept)
  58 versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);