glibc/sysdeps/arm/setfpucw.c

/* Set the FPU control word.
   Copyright (C) 1996, 1997, 1999, 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

#include <math.h>
#include <fpu_control.h>

#include <unistd.h>
#include <ldsodefs.h>
#include <dl-procinfo.h>
#include <sysdep.h>

void
__setfpucw (fpu_control_t set)
{
  if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
    {
      fpu_control_t cw;

      /* Fetch the current control word.  */
      _FPU_GETCW (cw);

      /* Preserve the reserved bits, and set the rest as the user
	 specified (or the default, if the user gave zero).  */
      cw &= _FPU_RESERVED;
      cw |= set & ~_FPU_RESERVED;

      _FPU_SETCW (cw);
    }

  /* Do nothing if a VFP unit isn't present.  */
}