ports/sysdeps/am33/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1998-2014 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, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <fenv.h>
  22 #include <fenv_libc.h>
  23 #include <fpu_control.h>
  24 #include <shlib-compat.h>
  25
  26 int
  27 __feclearexcept (int excepts)
  28 {
  29   fpu_control_t cw;
  30
  31   /* Mask out unsupported bits/exceptions.  */
  32   excepts &= FE_ALL_EXCEPT;
  33
  34   /* Read the complete control word.  */
  35   _FPU_GETCW (cw);
  36
  37   /* Clear exception flag bits and cause bits.  EF bits are cleared by
  38      assigning 1 to them (and there's no way to set them); other bits
  39      are copied normally.  */
  40
  41   cw &= ~((excepts << CAUSE_SHIFT) | FE_ALL_EXCEPT);
  42   cw |= excepts;
  43
  44   /* Put the new data in effect.  */
  45   _FPU_SETFCW (cw);
  46
  47   /* Success.  */
  48   return 0;
  49 }
  50
  51 libm_hidden_ver (__feclearexcept, feclearexcept)
  52 versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);